Category: Class 11

Tamilnadu State Board New Syllabus Samacheer Kalvi 11th Computer Science Guide Pdf Chapter 11 Functions Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 11th Computer Science Solutions Chapter 11 Functions

11th Computer Science Guide Functions Text Book Questions and Answers

Book Evaluation

Part I

Choose The Correct Answer

Question 1.
Which of the following header file defines the standard I/O predefined functions ?
a) stdio.h
b) math.h
c) string.h
d) ctype.h
Answer:
a) stdio.h

Question 2.
Which function is used to check whether a character is alphanumeric or not ?
a) isalpha( )
b) isdigit( )
c) isalnum( )
d) islower( )
Answer:
c) isalnum( )

Question 3.
Which function begins the program execution ?
a) isalpha( )
b) isdigit( )
c) main( )
d) islower( )
Answer:
c) main( )

Question 4.
Which of the following function is with a return value and without any argument ?
a) x=display(int/ int)
b) x=display( )
c) y=display(float)
d) display(int)
Answer:
b) x=display( )

Question 5.
Which is return data type of the function prototype of add (int, int); ?
a) int
b) float
c) char
d) double
Answer:
a) int

Question 6.
Which of the following is the scope operator ?
a) >
b) &
c) %
d) ::
Answer:
d) ::

Part – II

Very Short Answers

Question 1.
Define Functions.
Answer:
A large program can typically be split into small subprograms (blocks) called functions where each sub-program can perform some specific functionality. Functions reduce the size and complexity of a program, make it easier to understand, test, and check for errors.

Question 2.
Write about strlen() function.
Answer:
The strlen() takes a null-terminated byte string source as its argument and returns its length. The length does not include the null(\0) character.
Example:
char source[ ] = “Computer Science”;
cout<<“\nGiven String is “<<source<<” its Length is “<<strlen(source);
Output
Given String is Computer Science its Length is 16

Question 3.
What are the importance of void data type?
Answer:
void type has two important purposes:

1. To indicate the function does not return a value.
2. To declare a generic pointer.

Question 4.
What is Parameter and list its types?
Answer:
Arguments or parameters are the means to pass values from the calling function to the called function.
Types:

1. The variables used in the function definition as parameters are known as formal parameters.
2. The constants, variables, or expressions used j in the function call are known as actual parameters.

Question 5.
Write a note on Local Scope.
Answer:

1. A local variable is defined within a block. A block of code begins and ends with curly braces { }.
2. The scope of a local variable is the block in which it is defined.
3. A local variable cannot be accessed from outside the block of its declaration.
4. A local variable is created upon entry into its block and destroyed upon exit

Part – III

Short Answers

Question 1.
What is Built-in functions?
Answer:
The functions which are available by default are known as “Built-in” functions. Ready-to-use subprograms are called pre-defined functions or built-in functions.

Question 2.
What is the difference between isupper() and toupper() functions?
Answer:
isupper():

• This function is used to check the given character is uppercase.
• This function will return 1 if true otherwise 0.

toupper():

• This function is used to convert the given character into its uppercase.
• This function will return the upper case equivalent of the given character. If the given character itself is in upper case, the output will be the same.

Question 3.
Write about strcmp( ) function.
Answer:
strcmp( )
The strcmp( ) function takes two arguments: string 1 and string2. It compares the contents of string 1 and string2 lexicographically.
The strcmp() function returns a:

• Positive value if the first differing character in string 1 is greater than the corresponding character in string2. (ASCII values are compared)
• Negative value if the first differing character in string 1 is less than the corresponding character in string2,
• 0 if string1 and string2 are equal.

Example:
#include <string.h>
#include <iostream>
using namespace std;
int main()
{
char string1[ ] = “Computer”;
char string2[ ] = “Science”;
int result;
result = strcmp(string1,string2);
if(result==0)
{
cout<<“String1 : “<<string1<<” and String2 : “<<string2 <<“Are Equal”;
}
else
{
cout<<“String1 :”<<string1<<” and String2 : “<<string2’ <<“ Are Not Equal”;
}
}
Output
String1 : Computer and String2 : Science Are Not Equa1

Question 4.
Write short note on pow( ) function in C++.
Answer:
pow( ) function:
The pow( ) function returns base raised to the power of exponent. If any argument passed to pow( ) is long double, the return type is promoted to long double. If not, the return type is double.
The pow( ) function takes two arguments:

• base – the base value
• exponent – exponent of the base

#include <iostream>
#include <math.h>
using namespace std;
int main ( )
{
double base, exponent, result;
base = 5;
exponent = 4;
result = pow(base, exponent);
cout << “pow(“< double x = 25;;
result = sin(x);
cout << “\nsin(“<<x<<“)= “<<result;
return 0;
}
Output
pow(5^4) = 625
sin(25) = -0.132352

Question 5.
What are the information the prototype provides to the compiler?
Answer:
The prototype above provides the following information to the compiler:

1. The return value of the function is of type long.
2. Fact is the name of the function.
3. The function is called with two arguments:
   • The first argument is of int data type.
   • The second argument is of double data type, int display(int, int) // function prototype//.

The above function prototype provides details about the return data type, name of the function and a list of formal parameters or arguments.

Question 6.
What is default arguments ? Give example.
Answer:
default arguments:
In C++, one can assign default values to the formal parameters of a function prototype. The default arguments allows to omit some arguments when calling the function.

When calling a function,
For any missing arguments, complier uses the values in default arguments for the called function.
The default value is given in the form of variable initialization.

Example:
void defaultvalue(int n1=10, n2=100);
The default arguments facilitate the function call statement with partial or no arguments or complete arguments.

Example:
defaultvalue(x,y);
defaultvalue(200,150);
defaultvalue(150);
defaultvalue( );
The default values can be included in the function prototype from right to left, i.e., we cannot have a default value for an argument in between the argument list.

Example:
void defaultvalue(int n1 = 10, n2);//invalid prototype
void defaultvalue(int n1, n2 = 10);//valid prototype

Part – IV

Explain in Detail

Question 1.
Explain the Call by value method with a suitable example.
Answer:
Call by value method:
This method copies the value of an actual parameter into the formal parameter of the function. In this case, changes made to the formal parameter within the function will have no effect on the actual parameter.

Example:
#include <iostream>
using namespace std;
void display(int x)
{
int a = x * x;
cout<<“\n\nThe Value inside display function
(a * a):”<<a;
}
int main( )
{
int a;
cout<<“\nExample : Function call by value:”;
cout<<“\n\nEnter the Value for A cin>>a;
display(a);
cout<<”\n\nThe Value inside main function “<<a;
return (0);
}
Output:
Example: Function call by value Enter the Value for A : 5
The Value inside display function (a * a) : 25
The Value inside main function 5

Question 2.
What is Recursion? Write a program to find GCD using recursion.
Answer:
A function that calls itself is known as a recursive function. And, this technique is known as recursion.

Finding GCD of any to number using Recursion:
GCD – Greatest Common Divisor or HCF (Highest Common Factor) or GCM – Greatest Common Measure)
#include <iostream>
using namespace std;
//Function to find HCF or GCD OR GCM // int gcd(int n1, int n2)
{
if (n2 != 0)
return gcd(n2, n1 % n2); //Recursive call of gcd function
else
return n1;
}
int main( )
{
int num1, num2;
cout << “Enter two positive integers: “;
cin >> num1 >> num2;
cout << “Greatest Common Divisor (GCD) of ” << num1;
cout<< ” & ” << num2 << ” is: ” << gcd(num1, num2);
return 0;
}
Output :
Enter two positive integers: 350 100
Greatest Common Divisor (GCD) of 350 & 100 is: 50

Question 3.
What are the different forms of function return? Explain with example.
Answer:
Different forms of User-defined Function declarations:
Function without return value and without parameter
The following program is an example of a function with no return and no arguments passed.
The name of the function is display( ), its return data type is void and it does not have any argument.
#include <iostream>
using namespace std;
void display( )
{
cout<<“Function without parameter and return value”;
}
int main()
{
display( ); // Function calling statement//
return(O);
}
Output :
Function without parameter and return value
A Function with return value and without parameter
The name of the function is display(), its return type is int and it does not have any argument. The return statement returns a value to the calling function and transfers the program control back to the calling statement.

#include <iostream>
using namespace std;
int display( )
{
int a, b, s;
cout<<“Enter 2 numbers:
cin>>a>>b;
s=a+b;
return s;
}
int main( )
{
int m=display( );
cout<<“\nThe Sum=”<<m;
return(0);
}
OUTPUT :
Enter 2 numbers: 10 30
The Sum = 40

Question 4.
Explain scope of variable with an example.
Answer:
Scope refers to the accessibility of a variable.
There are four types of scopes in C++

1. Local Scope
2. Function Scope
3. File Scope
4. Class Scope

1. Local Scope:

• A local variable is defined within a block. A block of code begins and ends with curly braces {}.
• The scope of a local variable is the block in which it is defined.
• A local variable cannot be accessed from outside the block of its declaration.
• A local variable is created upon entry into its block and destroyed upon exit;

Example:
int main( )
{
int a,b;   //Local variable
}

2. Function Scope:

• The scope of a variable within a function is extended to the function block and all sub-blocks therein.
• The lifetime of a function scope variable is the lifetime of the function block.

Example:
int. sum(int x, int y);  //x and y has function scope.

3. File Scope:

• A variable declared above all blocks and functions (including main()) has the scope of a file.
• The lifetime of a file scope variable is the lifetime of a program.
• The file scope variable is also called a global variable.

Example:
#include
using namespace std;
int x,y; //x and y are global variable
void main()
{
……..
}

4. Class Scope:

• Data members declared in a class has the class scope.
• Data members declared in a class can be accessed by all member functions of the class.

Example:
Class example
{
int x,y; //x and y can be accessed by print() and void():
void print();
Void total();
};

Class Scope:
A class is a new way of creating and implementing a user-defined data type. Classes provide a method for packing together data of different types.
Data members are the data variables that represent the features or properties of a class.

Question 5.
Write a program to accept any integer number and reverse it.
Answer:
PROGRAM:
using namespace std;
#include <iostream>
int reverse(int num)
{
int r=0,d;
while(num>0)
{
d = num%10;
r = r*10+d;
num = num/10;
}
return (r);
}
int main( )
{
intx;
cout<<“\nEnter a number”;
cin>>x;
cout<<“\nReverse of the number is “<<reverse(x);
return 0;
}
OUTPUT

11th Computer Science Guide Functions Additional Questions and Answers

Choose The Correct Answer 1 Mark

Question 1.
………………. is the name of the function.
(a) Predefined
(b) Built-in
(c) Library
(d) All the above
Answer:
(d) All the above

Question 2.
…………….. reduce the size and complexity of a program, makes it easier to understand, test, and check for errors.
a) Arrays
b) Functions
c) Structures
d) Unions
Answer:
b) Functions

Question 3.
The strcpy() function takes two arguments of ……………….
(a) target and source
(b) upper and lower
(c) base and exponent
(d) none of these
Answer:
(a) target and source

Question 4.
Functions which are available in the C++ language standard library is known as ……………… functions.
a) Built-in
b) User-defined
c) Either A or B
d) None of these
Answer:
a) Built-in

Question 5.
The pow() function takes the two arguments of ……………….
(a) target and source
(b) upper and lower
(c) base and exponent
(d) source and exponent
Answer:
(c) base and exponent

Question 6.
Why functions are needed?
a) Divide and conquer the purpose
b) Reusability of code
c) Reduce the complexity of a program
d) All the above
Answer:
d) All the above

Question 7.
The C++ program always has a main() function to begin the program execution.
(a) 1
(b) 2
(c) 3
(d) null
Answer:
(a) 1

Question 8.
Ready-to-use subprograms are called ………………..
a) Pre-defined functions
b) Built-in functions
c) Either A or B
d) None of these
Answer:
c) Either A or B

Question 9.
In C++ the arguments can be passed to a function in ………………. ways.
(a) 2
(b) 1
(c) 3
(d) 7
Answer:
(a) 2

Question 10.
A header file can be identified by their file extension ……………..
a) .head
b) .h
c) .hf
d) None of these
Answer:
b) .h

Question 11.
…………… is a header file contains pre-defined standard input/output functions.
a) conio.h
b) istream.h
c) iostream.h
d) stdio.h
Answer:
d) stdio.h

Question 12.
stdio.h header file defines the standard I/O predefined function ……………
a) getchar()
b) putchar()
c) getsQ and puts()
d) All the above
Answer:
d) All the above

Question 13.
The predefined function ……………. is used to get a single character from the keyboard.
a) getchar()
b) putchar()
c) gets() and puts()
d) puts()
Answer:
a) getchar()

Question 14.
The predefined function …………… is used to display a single character.
a) getchar( )
b) putchar( )
c) gets( )
d) puts( )
Answer:
b) putchar( )

Question 15.
Function ……………… reads a string from standard input and stores it into the string pointed by the variable.
a) getchar( )
b) putchar( )
c) gets( )
d) puts( )
Answer:
c) gets( )

Question 16.
Function …………….. prints the string read by gets() function in a newline.
a) getchar( )
b) putchar( )
c) gets( )
d) puts( )
Answer:
d) puts( )

Question 17.
……………. header file defines various operations on characters.
a) conio.h
b) ctype.h
c) iostream.h
d) stdio.h
Answer:
b) ctype.h

Question 18.
……………… function is used to check whether a character is alphanumeric or not.
a) isalnum( )
b) isalpha( )
c) isdigit( )
d) None of these
Answer:
a) isalnum( )

Question 19.
………….. function returns a non-zero value if the given character is a digit or a letter, else it returns 0.
a) isalnum( )
b) isaipha( )
c) isdigit( )
d) None of these
Answer:
a) isalnum( )

Question 20.
The ……………… function is used to check whether the given character is an alphabet or not.
a) isalnum( )
b) isalpha( )
c) isdigit( )
d) None of these
Answer:
b) isalpha( )

Question 21.
………….. function will return 1 if the given character is an alphabet, and 0 otherwise 0.
a) isalnum( )
b) isalpha( )
c) isdigit( )
d) None of these
Answer:
b) isalpha( )

Question 22.
………… function is used to check whether a given character is a digit or not.
a) isalnum( )
b) isalpha( )
c) isdigit( )
d) None of these
Answer:
c) isdigit( )

Question 23.
……………. function will return 1 if the given character is a digit, and 0 otherwise.
a) isalnum( )
b) isalpha( )
c) isdigit( )
d) None of these
Answer:
c) isdigit( )

Question 24.
………………. function is used to check whether a character is in lower case (small letter) or not.
a) islower( )
b) tolower( )
c) Both A and B
d) None of these
Answer:
a) islower( )

Question 25.
……………. functions will return a non-zero value if the given character is a lower case alphabet, and 0 otherwise.
a) islower( )
b) tolower( )
c) toupper( )
d) isupper( )
Answer:
a) islower( )

Question 26.
……………. function is used to check the given character is uppercase.
a) islower( )
b) tolower( )
c) toupper( )
d) isupper( )
Answer:
d) isupper( )

Question 27.
……………. function will return 1 if the given character is an uppercase alphabet otherwise 0.
a) islower( )
b) tolower( )
c) toupper( )
d) isupper( )
Answer:
d) isupper( )

Question 28.
…………. function is used to convert the given character into its uppercase.
a) islower( )
b) tolower( )
c) toupper( )
d) isupper( )
Answer:
c) toupper( )

Question 29.
………….. function will return the upper case equivalent of the given character.
a) islower( )
b) tolower( )
c) toupper( )
d) isupper( )
Answer:
c) toupper( )

Question 30.
………………… function is used to convert the given character into its lowercase.
a) islower( )
b) tolower( )
c) toupper( )
d) isupper( )
Answer:
b) tolower( )

Question 31.
………………. function copies the character string pointed by the source to the memory location pointed by the target.
a) strcpy( )
b) strcat( )
c) strcmp( )
d) strlen( )
Answer:
a) strcpy( )

Question 32.
The …………………. function takes a null-terminated byte string source as its argument and returns its length.
a) strcpy( )
b) strcat( )
c) strcmp( )
d) strlen( )
Answer:
d) strlen( )

Question 33.
The length of the string does not include the _______ character.
a) Null(\0)
b) Blank space
c) White space
d) None of these
Answer:
a) Null(\0)

Question 34.
………………. function compares the contents of string1 and string2 lexicographically.
a) strcpy( )
b) strcat( )
c) strcmp( )
d) strlen( )
Answer:
c) strcmp()

Question 35.
The Strcmp( ) function returns a ………………. value if the first differing character in string1 is greater than the corresponding character in string2.
a) Positive
b) Negative
c) Zero
d) None of these
Answer:
a) Positive

Question 36.
The Strcmp() function returns a …………….. value if the first differing character in stringl is less than the corresponding character in string2.
a) Positive
b) Negative
c) Zero
d) None of these
Answer:
b) Negative

Question 37.
………………. function appends copy of the character string pointed by the source to the end of string pointed by the target.
a) strcpy( )
b) strcat( )
c) strcmp( )
d) strlen( )
Answer:
b) strcat( )

Question 38.
The …………….. function is used to convert the given string into Uppercase letters.
a) strupr( )
b) toupper( )
c) Both A and B
d) None of these
Answer:
a) strupr( )

Question 39.
The …………….. function is used to convert the given string into Lowercase letters.
a) tolower( )
b) strlwr( )
c) Both A and B
d) None of these
Answer:
b) strlwr( )

Question 40.
The cos( ) function takes a single argument in ………………
a) Radians
b) Degree
c) Either A or B
d) None of these
Answer:
a) Radians

Question 41.
The cos( ) function returns the value in the range of ……………
a) [0, 1]
b) [-1, 1]
c) [1,-1]
d) None of these
Answer:
b) [-1, 1]

Question 42.
The cos( ) function returns the value in ……………….
a) double
b) float
c) long double
d) Either A or B or C
Answer:
d) Either A or B or C

Question 43.
The sqrt( ) function takes a …………… argument.
a) single non-negative
b) single negative
c) double non-negative
d) double negative
Answer:
a) single non-negative

Question 44.
If a negative value is passed as an argument to sqrt( ) function, a …………….. occurs,
a) Data type mismatch
b) Domain error
c) Prototype mismatch
d) None of these
Answer:
b) Domain error

Question 45.
The ………….. function returns, the value in the range of [-1,1].
a) cos( )
b) sin( )
c) Both A and B
d) None of these
Answer:
c) Both A and B

Question 46.
The …………….. function returns base raised to the power of the exponent.
a) exponent( )
b) power( )
c) pow( )
d) None of these
Answer:
c) pow( )

Question 47.
If any argument passed to pow() is long double, the return type is promoted to ……………..
a) long double
b) int
c) double
d) char
Answer:
a) long double

Question 48.
The pow( ) function takes ……………… argument.
a) base
b) exponent
c) Both A and B
d) None of these
Answer:
c) Both A and B

Question 49.
The …………….. function in C++ seeds the pseudo-random number generator used by the rand() function.
a) srand( )
b) sran( )
c) rands( )
d) None of these
Answer:
a) srand( )

Question 50.
The srand( ) function is defined in ……………. header file.
a)
b) <stdlib)h>
c) or<stalib)h>
d) None of these
Answer:
c) or<stalib)h>

Question 51.
C++ program can contain ……………. main”() function.
a) Only one
b) No
c) More than one
d) None of these
Answer:
a) Only one

Question 52.
In C++,……………… function begins the program execution.
a) void
b) main( )
c) User-defined
d) Built-in
Answer:
b) main( )

Question 53.
………………. data type is used to indicate the function does not return a value.
a) int
b) double
c) void
d) unsigned
Answer:
c) void

Question 54.
……………… data type is used to declare a generic pointer.
a) int
b) double
c) void
d) unsigned
Answer:
c) void

Question 55.
The user-defined function should be called explicitly using its ………………
a) Name
b) Arguments to be passed
c) Both A and B
d) None of these
Answer:
c) Both A and B

Question 56.
Which of the following calling the function have a return value and with arguments?
a) display( );
b) display(x,y);
c) x = display( );
d) x = display(x,y);
Answer:
d) x = display(x,y);

Question 57.
Which of the following calling function have no return value and no argument?
a) display( );
b) display(x,y);
c) x = display();
d) x = display(x,y);
Answer:
a) display( );

Question 58.
Which of the following calling the function have no return value and with arguments?
a) display( );
b) display(x,y);
c) x = display();
d) x = display(x,y);
Answer:
b) display(x,y);

Question 59.
Which of the following calling the function have a return value and no argument?
a) display();
b) display(x,y);
c) x = display();
d) x = display(x,y);
Answer:
c) x = display();

Question 60.
…………………. are the means to pass values from the calling function to the called function.
a) Arguments
b) Parameters
c) Arguments or Parameters
d) None of these
Answer:
c) Arguments or Parameters

Question 61.
The variables used in the function definition as parameters are known as ……………. parameters.
a) Formal
b) Actual
c) Ideal
d) None of these
Answer:
a) Formal

Question 62.
The parameters used in the function call are known as ………………. parameters.
a) Formal
b) Actual
c) Ideal
d) None of these
Answer:
b) Actual

Question 63.
The ……………… can be used in the function call as parameters.
a) Constants
b) Variables
c) Expressions
d) All the above
Answer:
d) All the above

Question 64.
The …………….. arguments allow omitting some arguments when calling the function.
a) Default
b) Actual
c) Formal
d) None of these
Answer:
a) Default

Question 65.
The default value is given in the form of …………………….
a) Variable declaration
b) Variable initialization
c) void
d) None of these
Answer:
b) Variable initialization

Question 66.
The default arguments facilitate the function call statement with ………………. arguments.
a) Partial
b) No
c) Complete
d) All the above
Answer:
d) All the above

Question 67.
The default values can be included in the function prototype from ……………….
a) Left to Right
b) Right to Left
c) Center to Left
d) None of these
Answer:
b) Right to Left

Question 68.
The constant variable can be declared using the…………… keyword.
a) constant
b) Const
c) const
d) CONST
Answer:
c) const

Question 69.
The …………….. keyword makes variable value stable.
a) constant
b) Const
c) const
d) CONST
Answer:
c) const

Question 70.
The ……………… modifier enables to assign an initial value to a variable that cannot be changed later inside the body of the function,
a) void
b) Const
c) const
d) Unsinged
Answer:
c) const

Question 71.
In C++, the arguments can be passed to a function in ……………. ways.
a) three
b) two
c) four
d) None of these
Answer:
b) two

Question 72.
In C++, the arguments can be passed to a function in ……………… method.
a) Call by value
b) Call by reference
c) Either A or B
d) None of these
Answer:
c) Either A or B

Question 73.
………………. method copies the value of an actual parameter into the formal parameter of the function.
a) Call by value
b) Call by reference
c) Either A or B
d) None of these
Answer:
a) Call by value

Question 74.
In ……………. method, changes made to the formal parameter within the function will have no effect on the actual parameter.
a) Call by value
b) Call by reference
c) Either A or B
d) None of these
Answer:
a) Call by value

Question 75.
………… method copies the address of the actual argument into the formal parameter.
a) Call by value
b) Call by reference
c) Either A or B
d) None of these
Answer:
b) Call by reference

Question 76.
In the…………….. method, any change made in the formal parameter will be reflected back in the actual parameter.
a) Call by value
b) Call by reference
c) Either A or B
d) None of these
Answer:
b) Call by reference

Question 77.
The definition of the functions is stored in …………….
a) Array
b) Call by reference
c) Structures
d) None of these
Answer:
b) Call by reference

Question 78.
………….. functions can be used to reduce the overheads like STACKS for small function definition.
a) Inline
b) Built-in
c) User-defined
d) None of these
Answer:
a) Inline

Question 79.
……………. reduces the speed of program execution.
a) Array
b) Stacks
c) Structures
d) Unions
Answer:
b) Stacks

Question 80.
A(n) ………….. function looks like a normal function in the source file but inserts the function’s code directly into the calling program.
a) inline
b) Built-in
c) User-defined
d) None of these
Answer:
a) inline

Question 81.
To make a function inline, one has to insert the keyword …………….. in the function header.
a) Inline
b) Insert
c) INLINE
d) None of these
Answer:
a) Inline

Question 82.
……………. functions execute faster but require more memory space.
a) User-defined
b) Built-in
c) Inline
d) None of these
Answer:
c) Inline

Question 83.
The inline function reduces the complexity of using …………………
a) Array
b) Stacks
c) Structures
d) Unions
Answer:
b) Stacks

Question 84.
Returning from the function is done by using the ……………… statement.
a) return
b) goto
c) break
d) continue
Answer:
a) return

Question 85.
The …………….. statement stops execution and returns to the calling function.
a) return
b) goto
c) break
d) continue
Answer:
a) return

Question 86.
Identify the true statement from the following.
a) A return may or may not have a value associated with it.
b) If the return has a value associated with it, that value becomes the return value for the calling statement.
c) The return statement is used to return from a function.
d) AN the above
Answer:
d) AN the above

Question 87.
The functions that return no value are declared as ……………..
a) Null
b) void
c) Empty
d) None of these
Answer:
b) void

Question 88.
The data type of a function is treated as …………….. if no data type is explicitly mentioned.
a) Null
b) void
c) Empty
d) int
Answer:
d) int

Question 89.
What is the return type of the following function prototype? add (int, int);
a) Null
b) void
c) Empty
d) int
Answer:
d) int

Question 90.
What is the return type of the following function prototype? double add (int, int);
a) float
b) void
c) double
d) int
Answer:
c) double

Question 91.
What is the return type of the following function prototype?
char *display();
a) float
b) string
c) double
d) char
Answer:
b) string

Question 92.
A function that calls itself is known as ………….. function.
a) recursive
b) nested
c) invariant
d) variant
Answer:
a) recursive

Question 93.
A function that calls itself using …………. technique.
a) recursive
b) variant
c) invariant
d) recursion
Answer:
d) recursion

Question 94.
………………. is mandatory when a function is defined after the main() function.
a) Function prototype
b) Function parameters
c) Return statement
d) None of these
Answer:
a) Function prototype

Question 95.
Scope refers to the accessibility of a ……………..
a) Function
b) Class
c) Variable
d) Constant
Answer:
c) Variable

Question 96.
There are ………… types of scopes in C++.
a) five
b) two
c) three
d) four
Answer:
d) four

Question 97.
…………….. is a type of variable scope.
a) Local
b) Function / File
d) Class
d) All the above
Answer:
d) All the above

Question 98.
A …………… is a region or life of the variable and broadly speaking there are three places, where variables can be declared.
a) Scope
b) Access specifier
c) Location
d) None of these
Answer:
a) Scope

Question 99.
Variables inside a block are called …………… variables.
a) Local
b) Function
c) Class
d) File
Answer:
a) Local

Question 100.
Variables inside a function are called ………….. variables.
a) Local
b) Function
c) Class
d) File
Answer:
b) Function

Question 101.
Variables outside of ail functions are called ………….. variables.
a) Local
b) Function
c) Class
d) Global
Answer:
d) Global

Question 102.
Variables inside a class are called ……………
a) Class variable
b) Data members
c) Member functions
d) Either A or B
Answer:
d) Either A or B

Question 103.
The scope of formal parameters is …………… scope.
a) Local
b) Function
c) Class
d) File
Answer:
b) Function

Question 104.
A variable declared above all blocks and functions (including main ()) has the …………… scope.
a) Local
b) Function
c) Class
d) File
Answer:
d) File

Question 105.
The lifetime of a ………….. scope variable is the lifetime of a program.
a) Local
b) Function
c) Class
d) File
Answer:
d) File

Question 106.
The file scope variable is also called as ………….. variable.
a) Global
b) General
c) Void
d) None of these
Answer:
a) Global

Question 107.
…………… provides a method for packing together data of different types.
a) Enumeration
b) Array
c) Class
d) All the above
Answer:
c) Class

Question 108.
……………… represent the features or properties of a class.
a) Member function
b) Data member
c) Global variable
d) None of these
Answer:
b) Data member

Question 109.
…………….. is a scope resolution operator.
a) ? :
b) #
c) : :
d) &&
Answer:
c) : :

Question 110.
The …………… operator reveals the hidden scope of a variable.
a) ? :
b) &&
c) : :
d) #
Answer:
c) : :

Very Short Answers (2 Marks)

Question 1.
Write about reusability.
Answer:

1. Few lines of code may be repeatedly used in different contexts. Duplication of the same code can be eliminated by using functions which improve the maintenance and reduce program size.
2. Some functions can be called multiple times with different inputs.

Question 2.
Why functions are needed?
Answer:
To reduce the size and complexity of the program functions are used.

Question 3.
What are constant arguments and write their syntax?
Answer:
The constant variable can be declared using the const keyword. The const keyword makes variable, value stable. The constant variable should be initialized while declaring. The const modifier enables the assignment of an initial value to a variable that cannot be changed later inside the body of the function.
Syntax: (const )

Question 4.
Write a note on the reusability of the code.
Answer:
Reusability:

• Few lines of code may be repeatedly used in different contexts. Duplication of the same code can be eliminated by using functions which improve the maintenance and reduce program size.
• Some functions can be called multiple times with different inputs.

Question 5.
What is function scope?
Answer:
Function Scope:

1. The scope of variables declared within a function is extended to the function block and all sub-blocks therein.
2. The lifetime of a function scope variable is the lifetime of the function block. The scope of.

Question 6.
What is the header file?
Answer:
C++ provides a rich collection of functions ready to be used for various tasks. The tasks to be performed by each of these are already written, debugged, and compiled, their definitions alone are grouped and stored in files called header files

Question 7.
What is a built-in function?
Answer:
The ready-to-use subprograms are called pre-defined functions or built-in functions.

Question 8.
What is a user-defined function?
Answer:
C++ provides the facility to create new functions for specific tasks as per user requirements. The name of the task and data required is decided by the user and hence they are known as User-defined functions.

Question 9.
How a header file is identified?
Answer:
A header file can be identified by their file extension .h.
Example:
stdio.h

Question 10.
Write note on stdio.h header file.
Answer:
This header file defines the standard I/O predefined functions getchar(), putchar(), gets(), puts() and etc.

Question 11.
What is the purpose of getchar() and putchar() functions?
Answer:
The predefined function getchar() is used to get a single character from the keyboard and putchar() function is used to display it.

Question 12.
What is the purpose of gets() and puts() functions?
Answer:
Function gets( ) reads a string including balance spaces from standard input and stores it into the string pointed by the variable. Function puts() prints the string read by gets() function in a newline.

Question 13.
Write note on isalpha( ) function.
Answer:
The isalpha( ) function is used to check whether the given character is an alphabet or not.
Syntax:
int isalpha(char c);
This function will return 1 if the given character is an alphabet, and 0 otherwise 0. The following statement assigns 0 to the variable n, since the given character is not an alphabet.
int n = isalphaC3′);
The statement is given below displays 1, since the given character is an alphabet.
cout << isalpha(‘a’); .

Question 14.
Write the use of isdigit() function.
Answer:
This function is used to check whether a given character is a digit or not. This function will return 1 if the given character is a digit, and 0 otherwise.
Syntax:
int isdigit(char c);
When the following code is executed, the value of the variable n will be 1, since the given character is a digit.
char ch = ‘3’;
n = isdigit (ch);

Question 15.
How to copy a string into another string?
Answer:
The srcpy() function copies the character string pointed by the source to the memory location pointed by the target. The strcpy() function takes two arguments: target and source. The null terminating character (\0) is also copied.
Example:
char source[ ] = “Computer Science”;
char target[20]=”target”;
strcpy(target,source);

Question 16.
What is the purpose of strupr( ) and strlwr( ) functions?
Answer:

• The strupr( ) function is used to convert the given string into Uppercase letters.
• The strlwr( ) function is used to convert the given string into Lowercase letters.

Question 17.
What is the use of return statement in a function?
Answer:
Returning from the function is done by using the return statement.
The return statement stops execution and returns to the calling function. When a return statement is executed, the function is terminated immediately at that point.

Question 18.
Write note on scope resolution operator.
Answer:
The scope operator reveals the hidden scope ‘ of a variable. The scope resolution operator (::) is used for the following purposes.

To access a Global variable when there is a Local variable with same name. An example using Scope Resolution Operator.
PROGRAM :
#include <iostream>
using namespace std;
int x=45; // Global Variable x
int main()
{
int x = 10; // Local Variable x
cout << “\nValue of global x is ” << ::x;
cout << “\nValue of local x is ” << x;
return 0;
}
Output :
Value of global x is 45
Value of local x is 10

Short Answers (3 Marks)

Question 1.
What is divide and conquer?
Answer:
Divide and Conquer:

1. Complicated programs can be divided into manageable sub-programs called functions.
2. A programmer can focus on developing, debugging, and testing individual functions.
3. Many programmers can work on different functions simultaneously.

Question 2.
Write about islower( ) function.
Answer:
islower( )
This function is used to check whether a character is in lower case (small letter) or not.
This function will return a non-zero value, if the given character is a lower case alphabet, and 0 otherwise.
Syntax:
int islower(char c);

After executing the following statements, the value of the variable n will be 1 since the given character is in lower case
char ch = ‘n’;
int n = islower(ch);

The statement given below will assign 0 to the variable n, since the given character is an uppercase alphabet.
int n = islower(‘P’);

Question 3.
What is digit()? Give example.
Answer:
This function is used to check whether a given character is a digit or not. This function will return 1 if the given character is a digit, and 0 otherwise.

Example:
using namespace std;
#include
#include int main( )
{

char ch;
cout << “\n Enter a Character:”; cin >> ch;
cout << “\n The Return Value of isdigit(ch) is << isdigit(ch);

}
Output – 1
Enter a Character: 3
The Return Value of isdigit(ch) is: 1

Output – 2
Enter a Character: A
The Return Value of isdigit(ch) is: 0

Question 4.
Explain the method of comparing two strings.
Answer:
strcmp( ) function compares the contents of string 1 and string2 lexicographically. The strcmp() function takes two arguments: stringl and string2.

The strcmp( ) function returns a:

• Positive value if the first differing character in stringl is greater than the corresponding character in string2. (ASCII values are compared)
• Negative value if the first differing character in stringl is less than the corresponding character in string2.
• 0 if stringl and string2 are equal.

Example:
#include <string.h>
#inciude <iostream>
using namespace std;
int main()
{
char string1[ ] = “Computer”;
char string2[ ] = “Science”;
int result;
result = strcmp(string1,string2);
if(result==0)
{
cout<<“String1: “<<string1<<“and String2 : “<<string2 <<“Are Equal”;
}
else
{
cout<<“String1 :”<<string1<<” and String2 : “c<<string2<<” Are Not Equal”;
}
}
Output
String1 : Computer and String2 : Science Are Not Equal

Question 5.
What is a return statement with an example?
Answer:
The return statement stops execution and returns to the calling function. When a return statement is executed, the function is terminated immediately at that point. The return statement is used to return from a function. It is categorized as a jump statement because it terminates the execution of the function and transfers the control to the called statement.

Example:
return(a + b); return(a);
return; // to terminate the function

Question 6.
Write note on sin() and cos() functions.
Answer:
cos() function
The cos() function takes a single argument in radians. The cosQ function returns the value in the range of [-1, 1], The returned value is either in double, float, or long double.
Example:
#include <iostream>
#include <math.h>
using namespace std;
int main()
{
double x = 0.5, result;
result = cos(x);
cout << “COS(“<<x<<“)= “<<result;
}
Output
COS(0.5)= 0.877583
sin( ) function:
The sin() function takes a single argument in radians. The sin( ) function returns the value in the range of [-1, 1]. The returned value is either in double, float, or long double.

Question 7.
Write about sqrt( ) and pow( ) functions.
Answer:
sqrt( ) function:
The sqrt( ) function returns the square root of the given value of the argument. The sqrt( ) function takes a single non-negative argument. If a negative value is passed as an argument to sqrt( ) function, a domain error occurs.
Example:
#include <iostream>
#include <math.h>
using namespace std;
int main()
{
double x = 625, result;
result = sqrt(x);
cout << “sqrt(“<<x<<“) = “<<result;
return 0;
}
Output
sqrt(625) = 25
pow( ) function:
The pow( ) function returns base raised to the power of exponent. If any argument passed to pow() is long double, the return type is promoted to long double. If not, the return type is double.
The pow() function takes two arguments:
base – the base value
exponent – exponent of the base Example:
#include <iostream>
#include <math.h>
using namespace std;
int main ( )
{
double base, exponent, result;
base = 5;
exponent = 4;
result = pow(base, exponent);
cout << “pow(“< << “) = ” << result;
double x = 25;;
result = sin(x);
cout << “\nsin(“<<x<<“)= “<<result;
return 0;
}
Output
pow(5 ^ 4) = 625 sin(25)= -0.132352

Question 8.
How will you generate a random numbers?
Answer:
The srand( ) function in C++ seeds the pseudo random number generator used by the rand( ) function. The seed for rand( ) function is 1 by default. It means that if no srand( ) is called before rand(), the rand() function behaves as if it was seeded with srand(1).
The srand( ) function takes an unsigned integer as its parameter which is used as seed by the rand() function. It is defined inor <stdlib,h>header file.
Example:
#include <iostream>
#include <cstdlib.h>
using namespace std;
int main()
{
int random = rand(); /* No srand() calls before rand(), so seed = 1 */
cout << “\nSeed = 1, Random number = ” << random;
srand(10);
/* Seed = 10 */
random = rand( );
cout << “\n\nSeed = 10, Random number=” << random;
return 0;
}
Output
Seed = 1, Random number = 41
Seed =10, Random number =71

Question 9.
Write note on function prototype.
Answer:
Function Prototype:
C++ program can contain any number of functions. But, it must always have only one main( ) function to begin the program execution. We can write the definitions of functions in any order as we wish.

We can define the main( ) function first and all other functions after that or we can define all the needed functions prior to main( ). Like a variable declaration, a function must be declared before it is used in the program.
The declaration statement may be given outside the main( ) function.

Example:
long fact (int, double);

Question 10.
Explain Formal Parameters and Actual Parameters or Arguments.
Answer:
Formal Parameters and Actual Parameters or Arguments:
Arguments or parameters are the means to pass values from the calling function to the called function.

• The variables used in the function definition as parameters are known as formal parameters.
• The constants, variables or expressions used in the function call are known as actual parameters.

Explain in Detail (5 Marks)

Question 1.
Explain about generating random numbers with a suitable program.
Answer:
The srand() function in C++ seeds the pseudo-random number generator used by the rand() function. The seed for rand() function is 1 by default. It means that if no srand() is called before rand(), the rand() function behaves as if it was seeded with srand( 1). The srand() function takes an unsigned integer as its parameter which is used as seed by the rand() function. It is defined inor header file.
#include
#include using namespace std; int main()
{

int random = rand(); /* No srand() calls before rand(), so seed = 1*/
cout << “\nSeed = 1, Random number =” << random;
srand(10);
/* Seed= 10 */
random = rand();
cout << “\n\n Seed =10, Random number =” << random;
return 0;

}
Output:
Seed = 1, Random number = 41
Seed =10, Random number 71

Question 2.
How will access function? Explain in detail.
Answer:
Accessing a function:
The user-defined function should be called explicitly using its name and the required arguments to be passed. The compiler refers to the function prototype to check whether the function has been called correctly.

If the argument type does not match exactly with the data type defined in the prototype, the compiler will perform type conversion, if possible. If type conversion is impossible, the compiler generates an error message.
Example :

Question 3.
Explain constant argument in detail.
Answer:
Constant Arguments:
The constant variable can be declared using const keyword. The const keyword makes variable value stable. The constant variable should be initialized while declaring. The const modifier enables to assign an initial value to a variable that cannot be changed later inside the body of the function.
Syntax:
<returntype> <functionname> (const <datatype variable=value>)

Example:
int minimum(const int a=10);
float area(const float pi=3.14, int r=5);

PROGRAM
#include <iostream>
using namespace std; ,
double area(const double r,const double pi=3.14)
{
return(pi*r*r);
}
int main ( )
{
double rad,res;
cout<<‘AnEnter Radius :”;
cin>>rad;
res=area(rad);
cout << “\nThe Area of Circle =”<<res;
return 0;
}
OUTPUT:
Enter Radius: 5
The Area of Circle =78.5
If the variable value “r” is changed as r=25;
inside the body of the function “area” then compiler will throw an error as “assignment of
read-only parameter ‘r’ “.
double area (const double r, const double pi= 3.14)
{
r=25;
return(pi*r*r);
}

Question 4.
Explain about address method.
Answer:
This method copies the address of the actual argument into the formal parameter. Since the address of the argument is passed, any change made in the formal parameter will be reflected back in the actual parameter.
#include
using namespace std;
void display(int & x) //passing address of a//
{

x = x*x;
cout << “\n\n The Value inside display function (n1 x n1) :”<< x ;

}
int main()
{
intn 1;
cout << “\n Enter the Value for N1 cin >> n1;
cout << “\n The Value of N1 is inside main function Before passing:” << n1;
display(n1);
cout << “\n The Value of N1 is inside main function After passing (n1 x n1):”<< n1; retum(O);
}

Output:
Enter the Value for N1: 45
The Value of N1 is inside the main function Before passing: 45
The Value inside display function (n1 x n1) : 2025
The Value ofNl is inside the main function After passing (n1 x n1): 2025

Question 5.
Explain inline function in detial.
Answer:
Inline function:
An inline function looks like normal function in the source file but inserts the function’s code directly into the calling program. To make a function inline, one has to insert the keyword inline in the function header.

This reduces the speed of program execution. Inline functions can be used to reduce the overheads like STACKS for small function definition.
Syntax:
inline return type function name (data type parametername1,… datatype parameternameN)
Advantages of inline functions:

• Inline functions execute faster but requires more memory space.
• Reduce the complexity of using STACKS.

PROGRAM
#include <iostream>
using namespace std;
inline float simpleinterest (float pi, float nl, float r1)
{
float si1=(p1*n1*r1)/100;
return(si1);
}
int main ( )
{
float si,p,n,r;
cout<<“\nEnter the Principle Amount Rs. :”;
cin> >p;
cout<<“\nEnter the Number of Years:”;
cin>>n;
cout<<“\nEnter the Rate of Interest :”;
cin>>r;
si=simpleinterest(p,n,r);
cout << “\nThe Simple Interest = Rs,”<<si;
return 0;
}
Output:
Enter the Principle Amount Rs. :60000
Enter the Number of Years :10
Enter the Rate of Interest :5
The Simple Interest = Rs.30000
Though the above program is written in the normal function definition format during compilation the function code (p1*n1*r1)/100 will be directly inserted in the calling statement i.e. si=simpleinterest(p,n,r);
This makes the calling statement to change as si= (p1*n1*r1)/100;

Hands-On Practice

Write C++ program to solve the following problems:
Question 1.
Program that reads two strings and appends the first string to the second. For example, If the first string Is entered as Tamil and the second string is Nadu, the program should print Tamilnadu. Use string library header.
Answer:
PROGRAM :
#include <string.h>
#include <iostream>
using namespace std;
int main()
{
char firststr[50],secondstr[50];
cout<<“\nEnter First String “; cin> >firststr;
cout<<“\nEnter Second String”; cin>>secondstr;
strcat(firststr,secondstr); //concatenation process
cout << ”\nConcatenated string is : ” <<firststr;
return 0;
}
Output:

Question 2.
Program that reads a string and converts it to uppercase. Include required header files.
Answer:
PROGRAM :
#include <string.h>
#include <iostream>
using namespace std;
int main()
{
char str[50];
cout<<“\nEnter a String
cin>>str;
cout << “\nGvien string is : “<<str; strupr(str);
cout << “\nGvien string in Uppercase is :”<<str;
return 0;
}
Output :

Question 3.
Program that checks whether a given character is an alphabet or not. If It is an alphabet, whether It Is lowercase character or uppercase- character? Include required header files.
Answer:
PROGRAM :
#include <string.h>
#include <iostream>
using namespace std;
int main( )
{
char ch;
cout<<“\nEnter a Character”;
cin>>ch;
if(isalpha(ch))
if(islower(ch))
cout << “\nGiven Character is an Alphabet and in Lowercase”;
else
cout << “\nGiven Character is an Alphabet and in Uppercase “;
else
cout << “\nGiven Character in not an Alphabet”;
return 0;
Output

Question 4.
Program that checks whether the given character is alphanumeric or a digit Add appropriate header file
Answer:
PROGRAM :
#include <string.h>
#include <iostream>
using namespace std;
int main()
{
char ch;
cout<<“\nEnter a Character”;
cin>>ch;
if(isalnum(ch))
if(isdigit(ch))
cout << “\nGiven Character is an Alphanumeric and digit”;
else
cout << “\nGiven Character is an Alphanumeric but not digit”;
else
cout << “\nGiven Character in not an Alphanumeric or digit”;
return 0;
}
Output:

Question 5.
Write a function called zero_small ( ) that has two integer arguments being passed by reference and sets smaller of the two numbers to 0. Write the main program to access this function.
Answer:
PROGRAM
using namespace std;
#include <iostream>
void zero_small(int &a, int &b)
{
if (a<b)
a= 0;
else
b=0;
}
int main( )
{
int num1,num2;
cout<<“\nEnter two numbers :”; cin>>num1>>num2;
cout<<“\nNumber before set small value as 0 through function : num1=” <<num1<<” num2=”<<num2;
zero_small(num1,num2);
cout<<“\nNumber after set small value as 0 through function : num1=” <<num1<<” num2=”<<num2;
}
Output :

Question 6.
Write definition for a function sumseries ( ) in C++ with two arguments/ parameters – double x and int n. The function should return a value of type double and it should perform sum of the following series:
x-x2 /3! + x3 / 5! – x4 / 7! + x5 / 9! upto n terms.
Answer:
PROGRAM :
using namespace std;
#indude
double sumseries(double x, int n)
{
double sum=0,t;
int f=1,sign=1;
t=x;
inti=1‘,j=1;
while(i<=n)
{
sum = sum + sign * t/f;
j=j + 2;
i++;
f = f*j*(j-1);
t = t * x;
sign = -sign;
}
return(sum);
}
int main()
{
int i,x,n,f=1,sign=1;
cout<<“\nEnter X value …”;
cin>>x;
cout<<“\nEnter N value …”;
cin>>n;
cout<<“\nSUM OF THE SERIES = “<<sumseries(x,n);
return 0;
}
Output :

Question 7.
Program that Invokes a function calc ( ) which intakes two integers and an arithmetic operator and prints the corresponding result.
Answer:
PROGRAM :
using namespace std;
#include
void calc(int numl,int num2,char op)
{
int result;
switch(op)
{
case’+’:
result = num1 + num2;
cout<<“\nAdded value “<<result;
break;
case’-‘:
result = num1 – num2;
cout<<“\nSubtracted value “<< result;
break;
case’*’:
result = num1 * num2;
cout<<“\Multiplied value”<<result;
break;
case ‘/’:
result = num1 / num2;
cout<<“\nDivided value “<<result;
break;
default:cout<<“\nPROCESS COMPLETED”;
}
}
int main()
{
float n1,n2;
char op;
cout<<“\nl. Enter two numbers”; cin>>n1>>n2;
cout<<“\nEnter an Operaotr + or – or * Or / :”; cin>>op;
calc(nl,n2,op);
}
Output :

Tamilnadu State Board New Syllabus Samacheer Kalvi 11th Computer Science Guide Pdf Chapter 7 Composition and Decomposition Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 11th Computer Science Solutions Chapter 7 Composition and Decomposition

11th Computer Science Guide Composition and Decomposition Text Book Questions and Answers

Part I

Choose the correct answer.

Question 1.
Suppose u, v = 10, 5 before the assignment. What are the values of u and v after the . sequence of assignments?
1, u := v
2. v := u
a) u, v = 5, 5
b) u, v = 5, 10
c) u, v = 10, 5
d) u, v = 10, 10
Answer:
a) u, v = 5, 5

Question 2.
Which of the following properties is true after the assignment (at line 3)?
1. — i + j = 0
2. i, j : = i + 1, j – 1
3. –?
a) i + j >0
b) i + j < 0
c) i + j = 0
d) i = j
Answer:
b) i + j < 0

Question 3.
If Cl is false and C2 is true, the compound statement,
1. if C₁
2. S₁
3. else
4. if C₂
5. S₂
6. else
7. S₃
executes
a) S₁
b) S₂
c) S₃
d) none
Answer:
b) S₂

Question 4.
If C is false just before the loop, the control flows through. –
1. S₁
2. while C
3. S₂
4. S₃
a) S₁ ; S₃
b) S₁ ; S₂ ; S₃
c) S₁ ; S₂ ; S₂ ; S₃
d) S₁; S₂ ; S₂ ; S₂ ; S₃
Answer:
a) S₁ ; S₃

Question 5.
If C is true, S₁ is executed in both the flowcharts, but S₂ is executed in

a) (1) only
b) (2) only
c) both (1) and (2)
d) neither (1) nor (2)
Answer:
a) (1) only

Question 6.
How many times the loop is iterated? i := 0
while i ≠ 5
i : = i + 1
a) 4
b) 5
c) 6
d) 0
Answer:
b) 5

Part II

Short Answer Questions

Question 1.
Distinguish between a condition and a statement.
Answer:

Question 2.
Draw a flowchart for a conditional statement.
Answer:

Question 3.
Both conditional statements and iterative statements have a condition and a statement. How do they differ?
Answer:
Conditional Statement:

• Statements are executed only once when the condition is true.
• If condition statement.

Iterative Statement:

• An iterative statement repeatedly evaluates a condition and executes a statement until it becomes false.
• While condition statement.

Question 4.
What is the difference between an algorithm and a program?
Answer:

Question 5.
Why is a function an abstraction?
Answer:
Once a function is defined, it can be used over and over and over again. Reusability of a single function several times is known as an abstraction.

Question 6.
How do we define a statement?
Answer:
In a refinement, starting at a high level, each statement is repeatedly expanded into more detailed statements in the subsequent levels.

Part III

Explain in brief

Question 1.
For the given two flowcharts write the pseudo-code.

Answer:
if condition is True
Execute Statement S₁
else
Execute Statement S₂
endif
PSEUDO CODE FOR SECOND FLOWCHART
if the condition is True
Execute Statement S₁
Execute Statement S₂
else
Execute Statement S₂
endif.

Question 2.
If C is false in line 2, trace the control flow in this algorithm.
1. S₁
2. — C is false
3. if C
4. S₂
5. else
6. S₃
7. S₄
Answer:
The control flow for the given algorithm is as follows:
S₁
S₃
S₄
The condition is false so it executes S₃. In this case S₂ skipped.

Question 3.
What is case analysis?
Answer:
The case Analysis statement generalizes the problem into multiple cases. Case Analysis splits the problem into an exhaustive set of disjoint cases.

Question 4.
Draw a flowchart for -3 case analysis using alternative statements.
Answer:

Where C₁, C₂ and C₃ are conditions
S₁, S₂, S₃ and S₄ are statements.

Question 5.
Define a function to double a number in two different ways: (1) n + n,(2)2 x n.
Answer:
1. Double (n)
– – inputs: n is a real number or an integer, n > 0
– – Outputs: y is a real number or an integer such that y = n + n

2. Double (n)
– – inputs: n is a real number or an integer, n > 0
– – Outputs: y is a real number or an integer such that y = 2 x n

Part IV

Explain in detail

Question 1.
Exchange the contents: Given two glasses marked A and B. Glass A is full of apple drink and glass B is full of grape drink. Write the specification for exchanging the contents of glasses A and B, and write a sequence of assignments to satisfy the specification.
Answer:
The sequence of assignments to satisfy the specification:
exchange(A, B)
–inputs : A, B are real and > 0
–outputs: A, B are real and > 0
State representation
T = A
A: = B
B: = T

Question 2.
Circulate the contents: Write the specification and construct an algorithm to circulate the contents of the variables A, B and C as shown below: The arrows indicate that B gets the value of A, C gets the value of B and A gets the value of C.

Specification :
Circulated,B,C)
– – inputs: A,B,C all are real numbers
– – outputs: A,B,C, all are real numbers
T: = C
C: = B
B: = A
A: = T

Algorithm :
i) circulated,B,C)
ii) – – A,B,C
iii) T = C
iv) C = B
v) B = A
vi) A: = T

Question 3.
Decanting problem. You are given three bottles of capacities 5, 8, and 3 litres. The 8L bottle is filled with oil, while the other two are empty. Divide the oil in an 8L bottle into two equal quantities. Represent the state of the process by appropriate variables. What are the initial and final states of the process? Model the decanting of oil from one bottle to another by assignment. Write a sequence of assignments to achieve the final state.
Answer:
To divide the oil equally in the oil bottle, the following 7 steps are needed:

• Pour 5L of oil into the second bottle. (3,5,0)
• Pour 3L from the second bottle to the third. (3,2,3)
• Pour 3L from the third to the first. (6,2,0)
• Pour all 2L from the second to the third bottle (6,0,2)
• Pour 5L from the first to the second bottle. (1.5.2)
• Pour 1 L from the second to the third bottle. (1.4.3)
• Finally, pour now all 3L from the third bottle to the first (4,4,0)

Assignment statement as follows:

• E,F,T = 8,0,0
• E,F,T = 3,5,0
• E,F,T = 3,2,3
• E,F,T = 6,2,0
• E,F,T = 6,0,2
• E,F,T = 1,5,2
• E,F,T = 1,4,3
• E,F,T = 4,4,0

Question 4.
Trace the step-by-step execution of the algorithm for factorial(4).
factorial(n)
— inputs i rs is an integer, n > 0
— outputs : f ‘=s n!
f, i := 1,1
while i ≤ n
f,i = 11= f x i, i+1
Answer:
Tracing steps:
factorial(5)
i) f = 1, i = 1
ii) f = 1 x 1, i = 2
iii) f = 1 x 2, i = 3
iv) f = 2 x 3, i = 4
v) f = 6 x 4, i = 5
vi) f = 24 x 5, i = 6
vii) condition 6 < 5 becomes false then display output f value as 24.

11th Computer Science Guide Composition and Decomposition Additional Questions and Answers

Part I

Choose the correct answer:

Question 1.
Which one of the following is odd?
(a) Python
(b) C++
(c) C
(d) Ctrl + S
Answer:
(d) Ctrl + S

Question 2.
_________ is a notation for representing algorithms.
a) programming language
b) pseudo code
c) flow chart
d) All the above
Answer:
d) All the above

Question 3.
There are important control flow statements.
(a) four
(b) three
(c) two
(d) five
Answer:
(b) three

Question 4.
_________ is a notation similar to programming languages.
a) programming language
b) pseudo code
c) flow chart
d) none of these
Answer:
b) pseudo code

Question 5.
A ………………. is contained in a rectangular box with a single outgoing arrow, which points to the box to be executed next.
(a) statement
(b) composition
(c) notation
(d) condition
Answer:
(a) statement

Question 6.
_________ is a diagrammatic notation for representing algorithms.
a) programming language
b) pseudo code
c) flow chart
d) none of these
Answer:
c) flow chart

Question 7.
The algorithm can be specified as ……………….
(a) monochromatize (a, b, c)
(b) a = b = 0
(c) C = A + B + C
(d) none
Answer:
(a) monochromatize (a, b, c)

Question 8.
An algorithm expressed in a_________ is called a program.
a) programming language
b) pseudo code
c) flow chart
d) none of these
Answer:
a) programming language

Question 9.
Which one of the following is the elementary problem-solving technique?
(a) Specification
(b) Abstraction
(c) Composition
(d) decomposition
Answer:
(d) decomposition

Question 10.
_________ is formal.
a) programming language
b) pseudo code
c) flow chart
d) none of these
Answer:
a) programming language

Question 11.
How many different notations are there for representing algorithms?
(a) 2
(b) 3
(c) 4
(d) 5
Answer:
(b) 3

Question 12.
_________ do not allow the informal style of natural languages such as English or Tamil.
a) programs
b) pseudo code
c) flow charts
d) none of these
Answer:
a) programs

Question 13.
Which one of the following algorithmic notations is used for communication among people?
(a) Flow chart
(b) Pseudo code
(c) PL
(d) Interpreter
Answer:
(b) Pseudo code

Question 14.
_________ notation is not formal nor exact.
a) programs
b) pseudo code
c) flow charts
d) none of these
Answer:
b) pseudo code

Question 15.
The algorithmic notation similar to a Programming language is ……………….
(a) Flow chart
(b) Pseudo code
(c) C ++
(d) C
Answer:
(b) Pseudo code

Question 16.
In _________, there is no need to follow the rules of the grammar of a programming language.
a) programs
b) pseudo code
c) flow charts
d) none of these
Answer:
b) pseudo code

Question 17.
Which one is used for converting programs into computer-executable instructions?
(a) Converter
(b) Apps
(c) Translator
(d) exe files
Answer:
(c) Translator

Question 18.
_________ show the control flow of algorithms using diagrams in a visual manner.
a) programs
b) pseudo code
c) flow charts
d) none of these
Answer:
c) flow charts

Question 19.
The notation which is not formal nor exact is ……………….
(a) Flow chart
(b) Pseudocode
(c) Compiler
(d) Translator
Answer:
(b) Pseudocode

Question 20.
In flowcharts, _________ boxes represent conditions.
a) arrows
b) diamond shaped
c) rectangular shaped
d) none of these
Answer:
b) diamond shaped

Question 21.
Find the pair which is wrongly matched.
(a) Rectangular boxes – Statements
(b) Diamond boxes – Output
(c) Arrow – Control flow
(d) Parallelogram – Input
Answer:
(b) Diamond boxes – Output

Question 22.
A condition is contained in a diamond-shaped box with _________ outgoing arrows.
a) two
b) three
c) one
d) many
Answer:
a) two

Question 23.
The inputs and outputs are drawn using ……………….. boxes.
(a) rectangular
(b) diamond
(c) Parallelogram
(d) Oval
Answer:
(c) Parallelogram

Question 24.
In flow chart, _________ marked Start and the End are used to indicate the start and the end of an execution:
a) special box (oval)
b) diamond shaped
c) rectangular shaped
d) parallelogram
Answer:
a) special box (oval)

Question 25.
The flow of control is represented in the flowchart by ………………..
(a) arrow
(b) dot
(c) box
(d) plus
Answer:
(a) arrow

Question 26.
A_________ is a phrase that commands the computer to do an action.
a) statement
b) sentence
c) walkthrough
d) none of these
Answer:
a) statement

Question 27.
A condition is contained in a diamond-shaped box with ……………….. outgoing arrows.
(a) 2
(b) 3
(c) 4
(d) 5
Answer:
(a) 2

Question 28.
Statements composed of other statements are known as_________ statements.
a) compound
b) bock
c) nested
c) none of these
Answer:
a) compound

Question 29.
_________ statement are compound statements.
a) input
b) output
c) comment
d) control flow
Answer:
d) control flow

Question 30.
How many outgoing arrows are needed for rectangular boxes in the flow chart?
(a) 0
(b) 1
(c) 2
(d) 3
Answer:
(b) 1

Question 31.
___________ is a control flow statements.
a) Sequential
b) Alternative
c) Iterative
d) All the above
Answer:
d) All the above

Question 32.
Which one of the following is not a control flow statement?
(a) Sequential
(b) Assignment
(c) Iterative
(d) Alternative
Answer:
(b) Assignment

Question 33.
Case analysis splits the problem into an exhaustive set of __________ cases.
a) disjoint
b) similar
c) recursive
d) none of these
Answer:
a) disjoint

Question 34.
Which one of the following statements are executed one after the other as written in the algorithm?
(a) Sequential
(b) Iterative
(c) Conditional
(d) Decisive
Answer:
(a) Sequential

Question 35.
An__________ executes the same action repeatedly, subject to a condition.
a) iterative process
b) condition
c) sequential
d) None of these
Answer:
a) iterative process

Question 36.
Case analysis statement generalizes the statement into ……………….. cases.
(a) 2
(b) 3
(c) 5
(d) multiple
Answer:
(d) multiple

Question 37.
Testing the loop condition and executing the , loop body once is called.
a) iteration
b) condition
c) sequential
d) none of these
Answer:
a) iteration

Question 38.
Which one of the following processes executes the same action repeatedly?
(a) Conditional
(b) Alternative
(c) Iterative
(d) None of these
Answer:
(c) Iterative

Question 39.
__________ breaking and combining the solutions of the smaller problems to solve the original problem.
a) Composition
b) Decomposition
c) Eliminating
d) None of these
Answer:
b) Decomposition

Question 40.
Testing the loop condition and executing the loop body once is called ………………..
(a) alternative
(b) conditional
(c) Iteration
(d) Decomposition
Answer:
(c) Iteration

Question 41.
A(n)__________ is like a sub-algorithm.
a) function
b) array
c) structure
d) None of these
Answer:
a) function

Question 42.
A __________ can be used as a black box in solving other problems.
a) function
b) array
c) structure
d) None of these
Answer:
a) function

Question 43.
Identify the correct statement from the following.
a) There is no need for the users to know how the function is implemented in order to use it.
b) An algorithm used to implement a function may maintain its own variables.
c) users of the function need only to know what the function does, and not how it is done by the function.
d) All the above
Answer:
d) All the above

Question 44.
Conditional statement is executed only if the condition is true. Otherwise, __________ .
a) terminates the algorithm
b) repeat the procedure
c) skip the loop
d) nothing is done
Answer:
d) nothing is done

Part II

Short Answers

Question 1.
What is programming language?
Answer:
A programming language is a notation for expressing algorithms to be executed by computers.

Question 2.
What is a Pseudocode?
Answer:
Pseudocode is a mix of programming languages like constructs and plain English. Algorithms expressed in Pseudocode are not intended to be executed by computers but for human readers to understand.

Question 3.
What is flowchart?
Answer:
A flowchart is a diagrammatic notation for representing algorithms. They give a visual intuition of the flow of control, when the algorithm is executed.

Question 4.
What is a control flow statement? Classify it.
Answer:
Control flow statements are compound statements. They are used to alter the control flow of the process depending on the state of the process. They are classified as:

1. Sequential
2. Alternative
3. Iterative

Question 5.
What are the constraints of a programming language?
Answer:

• Programming language is formal.
• Programs must obey the grammar of the programming language exactly. Even punctuation symbols must be exact.
• They do not allow the informal style of natural languages such as English or Tamil.

Question 6.
When a condition statement will be executed?
Answer:
It will be executed only when the condition statement is true.

Question 7.
What is the advantage of a flowchart?
Answer:
They show the control flow of algorithms using diagrams in a visual manner.

Question 8.
What is a statement?
Answer:
A statement is a phrase that commands the computer to do an action.

Question 9.
What do you mean by compound statement?
Answer:
Statements may be composed of other statements, leading to a hierarchical structure of algorithms. Statements composed of other statements are known as compound statements.

Question 10.
What are the control flow statements?
Answer:
There are three important control flow statements:

• Sequential
• Alternative
• Iterative

Question 11.
What happen when a control flow statement is executed?
Answer:
When a control flow statement is executed, the state of the process is tested, and depending on the result, a statement is selected for execution.

Question 12.
Write the specification for finding minimum of two numbers.
Answer:
The specification of algorithm minimum is minimum (a, b)
– – inputs: a , b
– – outputs: result = a ↓ b.

Part III

Explain in brief

Question 1.
How many notations are there for representing algorithms? Explain.
Answer:
There are mainly three different notations for representing algorithms.

• A programming language is a notation for expressing algorithms to be executed by computers.
• Pseudocode is a notation similar to programming languages. Algorithms expressed in pseudo-code are not intended to be executed by computers, but for communication among people.
• A flowchart is a diagrammatic notation for representing algorithms. They give a visual intuition of the flow of control, when the algorithm is executed.

Question 2.
What are the disadvantages of a flowchart?
Answer:
Flowcharts also have the following disadvantages:

• Flowcharts are less compact than the representation of algorithms in a programming language or pseudo code.
• They obscure the basic hierarchical structure of the algorithms.
• Alternative statements and loops are disciplined control flow structures.

Question 3.
Write a note on refinement.
Answer:
After decomposing a problem into smaller subproblems, the next step is either to refine the subproblem or to abstract the subproblem.
1. Each subproblem can be expanded into more detailed steps. Each step can be further expanded to still finer steps, and so on. This is known as refinement.

2. We can also abstract the subproblem. We specify each subproblem by its input property and the input-output relation. While solving the main problem, we only need to know the specification of the subproblems. We do not need to know how the subproblems are solved.

Question 4.
Write an algorithm that compares numbers and produces the result as

We can split the state into an exhaustive set of 3 disjoint cases: a < b, a = b, and a> b. Then we can define compare() using a case analysis. The algorithm is as given below.

1. compare(a, b)
2. case a < b
3. result := -1
4. case a = b
5. result := 0
6. else – – a > b
7. result: = 1

Question 5.
Construct specification and write an iterative algorithm to compute the quotient and remainder after dividing an integer A by another integer B.
Answer:
Specification: divide (A, B)
— inputs: A is an integer and B ≠ 0
— outputs : q and r such that A = q x B
+ r and 0 ≤ r < B

Algorithm:
divide (A, B)
— inputs: A is an integer and B * 0
— outputs : q and r such that
A = q X B + r and
— 0 < r < B
q := 0, A
while r ≥ B
q, r := q + 1, r – B

Question 6.
Explain Decomposition.
Answer:
It involves breaking down a problem into smaller and more manageable problems, and combining the solutions of the smaller problems to solve the original problem. Often, problems have structure.
We can exploit the structure of the problem and break it into smaller problems. Then, the smaller problems can be further broken until they become sufficiently small to be solved by other simpler means.
Their solutions are then combined together to construct a solution to the original problem.

Question 7.
Construct an iterative algorithm to compute the quotient and remainder after dividing an integer A by another integer B.
Answer:
divide (A, B)
– – inputs: A is an integer and B ≠ 0
– – Outputs: q and r such that A = q x B + r and 0 < r < B
q : = 0, A
While r ≥ B
q, r : = q + 1, r – B

Question 8.
Draw a flow chart for Eat breakfast.
Answer:
Flowchart for Eat breakfast

Part IV

Explain in detail

Question 1.
What is flowchart? Explain the various boxes (symbols) used in flowchart.
Answer:
A flowchart is a diagrammatic notation for representing algorithms. They show the control flow of algorithms using diagrams in a visual manner.

In flowcharts, rectangular boxes represent simple statements, diamond-shaped boxes
represent conditions, and arrows describe how the control flows during the execution of the algorithm. A flowchart is a collection of boxes containing statements and conditions which are connected by arrows showing the order in which the boxes are to be executed,

i) A statement is contained in a rectangular box with a single outgoing arrow, which points to the box to be executed next.

ii) A condition is contained in a diamond-shaped box with two outgoing arrows, labeled true and false. The true arrow points to the box to be executed next if the condition is true, and the false arrow points to the box to be executed next if the condition is false.

iii) Parallelogram boxes represent inputs given and outputs produced.

iv) Special boxes marked Start and the End is used to indicate the start and the end of execution.

Question 2.
Draw a flowchart to compute the quotient and remainder after dividing an integer A by another integer B.
Answer:
Flowchart for integer division

Question 3.
Explain sequential statement with suitable example.
Answer:
A sequential statement is composed of a sequence of statements. The statements in the sequence are executed one after another, in the same order as they are written in the algorithm, and the control flow is said to be sequential. Let S₁ and S₂ be statements. A sequential statement composed of S₁ and S₂ is written as
S₁
S₂
In order to execute the sequential statement, first, do S₁ and then do S₂.

The sequential statement given above can be represented in a flowchart as shown in in the following Figure. The arrow from S₁ to S₂ indicates that S₁ is executed, and after that, S₂ is executed.

Let the input property be P, and the input-output relation be Q, for a problem. If statement S solves the problem, it is written as
i) –P
ii) S
iii) — Q

Question 4.
Explain alternative statement with an example. A condition is a phrase that describes a test of the state. If C is a condition and both SI and S2 are statements, then

if C
S₁
else
S₂

is a statement, called an alternative statement, that describes the following action:
i) Test whether C is true Or false.
ii) If C is true, then do SI; otherwise do S2.

In pseudo-code, the two alternatives S1 and S2 are indicated by indenting them from the keywords if and else, respectively. Alternative control flow is depicted in the following flowchart.

Condition C has two outgoing arrows, labeled true and false. The true arrow points to the SI box. The false arrow points to the S2 box. Arrows out of S1 and S2 point to the same box, the box after the alternative statement.

Question 5.
Explain conditional statement with suitable example.
Answer:
Sometimes we need to execute a statement only if a condition is true and do nothing if the condition is false. This is equivalent to the alternative statement in which the else-clause is empty. This variant of alternative statement is called a conditional statement. If C is a condition and S is a statement, then
if C
S
is a statement, called a conditional statement, that describes the following action:

• Test whether C is true or false.
• If C is true then do S; otherwise do nothing.

The conditional control flow is depicted in the following flowchart.

Question 6.
Write a note on case analysis.
Answer:
An alternative statement analyses the problem into two cases. The case analysis statement generalizes it to multiple cases. Case analysis splits the problem into an exhaustive set of disjoint cases. For each case, the problem is solved independently. If C1, C2, and C3 are conditions, and S1, S2, S3, and S4 are statements, a 4 – case analysis statement has the form.

1. case C1
2. S1
3. case C2
4. S2
5. case C3
6. S3
7. else
8. S4

The conditions C1, C2, and C3 are evaluated in turn. For the first condition that evaluates to true, the corresponding statement is executed, and the case analysis statement ends. If none of the conditions evaluates to true, then the default case S4 is executed.

1. The cases are exhaustive: at least one of the cases is true. If all conditions are false, the default case is true.
2. The cases are disjoint: only one of the cases is true. Though it is possible for more than one condition to be true, the case analysis always executes only one case, the first one that is true.
3. f the three conditions are disjoint, then the four cases are (1) C1, (2) C2, (3) C3, (4) (not C1), and (not C2) and (not C3).

Question 7.
Explain iterative statement with suitable example.
Answer:
An iterative process executes the same action repeatedly, subject to a condition C.
If C is a condition and S is a statement, then
while C
S
is a statement, called an iterative statement, that describes the following action:

• Test whether C is true or false.
• If C is true, then do S and go back to step 1; otherwise do nothing.

The iterative statement is commonly known as a loop. These two steps, testing C and executing S, are repeated until C becomes false. When C becomes false, the loop ends, and the control flows to the statement next to the iterative statement.

The condition C and the statement S are called the loop condition and the loop body, respectively. Testing the loop condition and executing the loop body once is called an iteration, not C is known as the termination condition.
Iterative control flow is depicted in the following flowchart

Condition C has two outgoing arrows, true and false. The true arrow points to S box. If C is true, S box is executed and control flows back to C box. The false arrow points to the box after the iterative statement (dotted box). If C is false, the loop ends and the control flows to the next box after the loop.

Tamilnadu State Board New Syllabus Samacheer Kalvi 11th Computer Science Guide Pdf Chapter 6 Specification and Abstraction Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 11th Computer Science Solutions Chapter 6 Specification and Abstraction

11th Computer Science Guide Specification and Abstraction Text Book Questions and Answers

Part I

Choose the best answer

Question 1.
Which of the following activities is algorithmic in nature?
a) Assemble a bicycle
b) Describe a bicycle
c) Label the parts of a bicycle
d) Explain how a bicycle works
Answer:
a) Assemble a bicycle

Question 2.
Which of the following activities is not algorithmic in nature?
a) Multiply two numbers
b) Draw a kolam
c) Walk in the park
d) Braid the hair
Answer:
d) Braid the hair

Question 3.
Omitting details inessential to the task and representing only the essential features of the task is known as
a) specification
b) abstraction
c) composition
d) decomposition
Answer:
b) abstraction

Question 4.
Stating the input property and the as :-output relation a problem is known
a) specification
b) statement
c) algorithm
d) definition
Answer:
a) specification

Question 5.
Ensuring the input-output relation is
a) the responsibility of the algorithm and the right of the user
b) the responsibility of the user and the right of the algorithm
c) the responsibility of the algorithm but not the right of the user
d) the responsibility of both the user and the algorithm
Answer:
d) the responsibility of both the user and the algorithm

Question 6.
If i = 5 before the assignment i := i-1 after the assignment? the value of i is
a) 5
b) 4
c) 3
d) 2
Answer:
b) 4

Question 7.
If 0 < i before the assignment S := i-1 after the assignment, we cars conclude that
a) 0 < i
b) 0 < i c) i = 0 d) 0 >i
Answer:
b) 0 < i

Part II

Short Answers

Question 1.
Define an algorithm
Answer:
An algorithm is a step-by-step sequence of statements intended to solve a problem. An algorithm starts execution with the input data, executes the statements, and finishes execution with the output data.

Question 2.
Distinguish between an algorithm and a process.
Answer:
An algorithm is a sequence of instructions to accomplish a task or solve a problem.
An instruction describes an action. When the instructions are executed, a process evolves which accomplishes the intended task or solves the given problem.
We can compare an algorithm to a recipe, and the resulting process to cooking.

Question 3.
Initially, farmer, goat, grass, wolf = L, L, L, L, and the farmer crosses the river with a goat. Model the action with an assignment statement.
Answer:
The sequence of assignments for goat, grass, and wolf problem.

Question 4.
Specify a function to find the minimum of two numbers.
Answer:

1. – – minimum (a,b)
2. – – inputs: a, b are real numbers.
3. – – output: result: = minimum (a,b)

Question 5.
If √2 = 1.414, and the square_root() function returns -1.414, does it violate the following specification?
— square_root (x)
— inputs: x is a real number, x ≥ 0
— outputs: y is d real number such that y² = x
Answer:
— square_root (x)
— inputs: x is a real number, x > 0
— outputs: y is d real number such that y² = x
Yes. It violates the specification. For a positive input (x > 0), the output square-root value should also be positive.

Part III

Explain in brief.

Question 1.
When do you say that a problem is algorithmic in nature?
Answer:
A Problem is algorithmic in nature when its solution involves the construction of an algorithm. Also when the

1. Input data and output data of the problem are specified.
2. The relation between the input data and the output data is specified.

Question 2.
What is the format of the specification of an algorithm?
Answer:
An algorithm is specified by the properties of the given input and the relation between the input and the desired output. In simple words, the specification of an algorithm is the desired input-output relation.

Let P be the required property of the inputs and Q the property of the desired outputs. Then the algorithm S is specified as;

• algorithm_name (inputs)
• – inputs: P
• – outputs: Q

This specification means that if the algorithm starts with inputs satisfying P, then it will finish with the outputs satisfying Q.

Question 3.
What is abstraction?
Answer:
Abstraction:
It is the facility to define objects. It also involves the removal of unnecessary attributes and defining only essential attributes. For example, when we represent the state of a process we select only the variables essential to the problem and ignore inessential details.

Question 4.
How is the state represented in algorithms?
Answer:
Computational processes in the real-world have stated. As a process evolves, the state changes.
The state of a process can be represented by a set of variables in an algorithm. The state at any point of execution is simply the values of the variables at that point. As the values of the variables are changed, the state changes.

Example:
State: A traffic signal may be in one of the three states: green, amber, or red. The state is changed to allow a smooth flow of traffic. The state may be represented by a single variable signal which can have one of the three values: green, amber, or red.

Question 5.
What is the form and meaning of the assignment statement?
Answer:
Variables are named boxes to store values. The assignment statement is used to store a value in a variable. It is written with the variable on the left side of the assignment operator and a value on the right side.
variable := value

When this assignment is executed, the value on the right side is stored in the variable on the left side. The assignment
m := 2 stores value 2 in variable m.

If the variable already has a value stored in it, the assignment changes its value to the value on the right side. The old value of the variable is lost.
The right side of an assignment can be an expression.
variable := expression
In this case, the expression is evaluated and the value of the expression is stored in the variable.

Question 6.
What is the difference between assignment operator and equality operator?
Answer:

Part IV

Explain in detail

Question 1.
Write the specification of an algorithm hypotenuse whose inputs are the lengths of the two shorter sides of a right-angled triangle, and the output is the length of the third side.
Answer:
hypotenuse(sl, s2).
— inputs: si and s2 both are real numbers
— outputs: I is a real number such that
l² = s1²+ S2².

Question 2.
Suppose you want to solve the quadratic equation ax² + bx + c = 0 by an algorithm.
quadratic_solve (a, b, c)
— inputs : ?
— outputs: ?
You intend to use the formula and you are prepared to handle only real number roots. Write a suitable specification.
\(x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}\)
Solution;
quadratic_solve (a, b, c).
– inputs : a,b,c all are real numbers, a ≠ 0.
– outputs: x is a real number.
\(x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}\)
such that b² – 4ac > 0.

Question 3.
Exchange the contents: Given two glasses marked A and B Glass A is full of apple drink and glass B is full of grape drink. For exchanging the contents of glasses A and B, represent the state by suitable variables, and write the specification of the algorithm.
Answer:
The specification of the algorithm:
exchange (A, B)
–inputs: A,B are real and >0
–outputs: A,B are real and >0
State representation
TEMP:=A
A:=B
B := TEMP

11th Computer Science Guide Specification and Abstraction Additional Questions and Answers

Part I

Choose the best answer

Question 1.
Which one of the following is an example of a process?
(a) Braid the hair
(b) Adding three numbers
(c) Cooking a dish
(d) Walk in the Road
Answer:
(c) Cooking a dish

Question 2.
An instruction describes an __________
a) action
b) input
c) output
d) flow
Answer:
a) action

Question 3.
How many basic building blocks construct an algorithm?
(a) 3
(b) 4
(c) 5
(d) 8
Answer:
(b) 4

Question 4.
Instructions of a computer are also known as _________
a) statements
b) structures
c) procedures
d) None of these
Answer:
a) statements

Question 5.
……………….. how many control flow statement is there to alter the control flow depending on the state?
(a) 5
(b) 6
(c) 3
(d) 8
Answer:
(c) 3

Question 6.
__________ is a step in solving a mathematical problem suggested by G Polya.
a) Understand the problem and Devise a plan
b) Carry out the plan
c) Review your work
d) All the above
Answer:
d) All the above

Question 7.
……………….. statement is used to store a value in a variable.
(a) Assignment
(b) Sequential control flow
(c) Alternative control flow
(d) Iterative
Answer:
(a) Assignment

Question 8.
__________takes input data, process the data, and produce output data.
a) Function
b) Algorithm
c) Procedure
d) None of these
Answer:
b) Algorithm

Question 9.
Each part of the algorithm is known as ………………..
(a) input
(b) function
(c) variable
(d) program
Answer:
(b) function

Question 10.
When we do operations on data, we need to store the results in________
a) Function
b) Algorithm
c) Constant
d) Variable
Answer:
d) Variable

Question 11.
If i: = 3 before the assignment, i: = i + 1 after the assignment ………………..
(a) 3
(b) 4
(c) 5
(d) 0
Answer:
(b) 4

Question 12.
In algorithm, the statement to be executed next may depend on the __________
a) algorithm step
b) state of the process
c) user direction
d) None of these
Answer:
b) state of the process

Question 13.
If i: = 10 before the assignment, then i: = i % 2 after the assignment
(a) 10
(b) 5
(c) 0
(d) 1
Answer:
(c) 0

Question 14.
There are control flow statements to alter the control flow depending on the state.
a) two
b) five
c) four
d) three
Answer:
d) three

Question 15.
Initially the values of P and C are 4 and 5 respectively
– – P, C : = 4, 5
P : = C
C : = P. Then find P and C
(a) 4 and 4
(b) 5 and 4
(c) 5 and 5
(d) 4 and 5
Answer:
(c) 5 and 5

Question 16.
__________ control flow, a condition of the state is tested, and if the condition is true, one statement is executed; if the condition is false, n alternative statement is executed.
a) alternative
b) iterative
c) random
d) sequential
Answer:
a) alternative

Question 17.
How many Algorithmic designing techniques are there?
(a) 2
(b) 3
(c) 4
(d) 5
Answer:
(c) 4

Question 18.
A ___________ takes an input and produces an output, satisfying a desired input-output relation.
a) function
b) union
c) structures
d) None of these
Answer:
a) function

Question 19.
which one of the following is the equality operator?
(a) =
(b) = =
(c) + +
(d) – –
Answer:
(b) = =

Question 20.
___________ is the basic principle and technique for designing algorithm.
a) Specification
b) Abstraction
c) Composition and Decomposition
d) All the above
Answer:
d) All the above

Question 21.
Which one of the following statements are not executed on the computers?
(a) Comment line
(b) Header file
(c) cin
(d) cout
Answer:
(a) Comment line

Question 22.
Ignoring or hiding unnecessary details and modeling an entity only by its essential properties is known as __________
a) data hiding
b) abstraction
c) data analysis
d) None of these
Answer:
b) abstraction

Question 23.
The values of the variables when the algorithm finishes is ………………..
(a) final stage
(b) final state
(c) last stage
(d) last state
Answer:
(b) final state

Question 24.
An algorithm is composed of__________
statement.
a) assignment
b) control flow
c) both A and B
d) None of these
Answer:
c) both A and B

Question 25.
Which one of the following is not a building block of the algorithm?
(a) data
(b) state
(c) variables
(d) functions
Answer:
(b) state

Question 26.
To solve a problem, we must state the problem__________
a) clearly and precisely
b) with ambiguity
c) with data hiding
d) None of these
Answer:
a) clearly and precisely

Question 27.
Reasoning:
I. We can store a value in a variable using the assignment operator.
II. We can change the value in a variable using the assignment operator.
III. Assignment operator is = =
(a) I and III are true
(b) I and II are true
(c) II and III are true
(d) I, II, III is true
Answer:
(b) I and II are true

Question 28.
Specification of an algorithm is the desired __________relation.
a) input-process
b) process-output
c) input-output
d) None of these
Answer:
c) input-output

Question 29.
In which one of the control flow statements, if the condition is false, then the alternative statement will be executed ………………..
(a) Sequential
(b) iterative
(c) selection
(d) alternative
Answer:
(d) alternative

Question 30.
The values of the variables when the algorithm starts are known as the __________state.
a) initial
b) final
c) intermediate
d) None of these
Answer:
a) initial

Question 31.
If the statement is executed one after the other, then it is a control flow.
(a) Sequential
(b) iterative
(c) selection
(d) alternative
Answer:
(a) Sequential

Question 32.
We can write the specification in a standard __________part format.
a) three
b) four
c) two
d) many
Answer:
a) three

Question 33.
Which one of the following is not a technique for designing algorithms?
(a) specifications
(b) abstraction
(c) encapsulation
(d) composition
Answer:
(c) encapsulation

Question 34.
__________defines the rights and responsibilities of the designer and the user.
a) Specification
b) Abstraction
c) Composition and Decomposition
d) All the above
Answer:
a) Specification

Question 35.
How many parts are there in the specification is ………………..
(a) 2
(b) 3
(c) 4
(d) 5
Answer:
(b) 3

Question 36.
In algorithms, the state of a computation is abstracted by a set of __________
a) expressions
b) variables
c) functions
d) None of these
Answer:
b) variables

Question 37.
Identify the statement which is not true?
(a) An instruction describes an object
(b) the specification is one of the algorithm design techniques
(c) An algorithm is a step by step sequence of instructions
Answer:
(a) An instruction describes an object

Question 38.
_________ is a basic and important abstraction.
a) process
b) state
c) addition
d) None of these
Answer:
d) None of these

Question 39.
Sequential, Alternative, and Iterative comes under the classification of ……………….. :
(a) Building blocks of the algorithm
(b) control flow statements
(c) Algorithm design techniques
(d) Abstraction
Answer:
(b) control flow statements

Part II

Short Answer Questions

Question 1.
Define State.
Answer:
The state of a process can be represented by a set of variables in an algorithm. The State at any point of execution is simply the values of the variables at that point.

Question 2.
What is the statement?
Answer:
Instructions of a computer are also known as statements.

Question 3.
Define variable.
Answer:
The data stored in a variable is also known as the value of the variable. We can store a value in a variable or change the value of a variable, using an assignment statement.

Question 4.
What are the building blocks of algorithms?
Answer:
The building blocks of algorithms are;

• Data.
• Variables.
• Control flow.
• Functions.

Question 5.
Define control flow.
Answer:
The order in which the statements are executed may differ from the order in which they are written in the algorithm. This order of execution of statements is known as the control flow.

Question 6.
What is a function?
Answer:
The parts of an algorithm are known as functions. A function is like a sub-algorithm. It takes an input, and produces an output, satisfying the desired input, output relation.

Question 7.
How will you specify the algorithm?
Answer:
The algorithm S is specified as;

• algorithm_name (inputs)
• inputs: P
• outputs: Q

This specification means that if the algorithm starts with inputs satisfying P, then it will finish with the outputs satisfying Q.

Question 8.
Define abstraction.
Answer:
Abstraction is the process of ignoring or hiding irrelevant details and modeling a problem only by its essential features.

Question 9.
What purpose abstraction is used?
Answer:
Abstraction is the most effective mental tool used for managing complexity. If we do not abstract a problem adequately, we may deal with unnecessary details and complicate the solution.

Part III

Explain in brief

Question 1.
Define Alternative control flow statement.
Answer:
In alternative control flow, a condition of the state is tested, and if the condition is true, one statement is executed; if the condition is false, an alternative statement is executed.

Question 2.
Justify goat, grass, and wolf problem is algorithmic.
Answer:
goat, grass, and wolf problem:
A farmer wishes to take a goat, a grass bundle, and a wolf across a river. However, his boat can take only one of them at a time. So several trips are necessary across the river.

Moreover, the goat should not be left alone with the grass (otherwise, the goat would eat the grass), and the wolf should not be left alone with the goat (otherwise, the wolf would eat the goat).

How can the farmer achieve the task? Initially, we assume that all the four are at the same side of the river, and finally, all the four must be on the opposite side. The farmer must be in the boat when crossing the river.
A solution consists of a sequence of instructions indicating who or what should cross. Therefore, this is an algorithmic problem.

Question 3.
Write the Iterative control flow statement.
Answer:
In iterative control flow, a condition of the state is tested, and if the condition is true, a statement is executed. The two steps of testing the condition and executing the statement are repeated until the condition becomes false.

Question 4.
Explain variable.
Answer:
Variables are named boxes for storing data. When we do operations on data, we need to store the results in variables. The data stored in a variable is also known as the value of the variable.
We can store a value in a variable or change the value of a variable, using an assignment statement.

Question 5.
Write the following
(i) initial state
(ii) final state
Answer:
The values of the variables when the algorithm starts are known as the initial state, and the values of the variables when the algorithm finishes are known as the final state.

Question 6.
When functions are needed?
Answer:
Algorithms can become very complex. The variables of an algorithm and dependencies among the variables may be too many. Then, it is difficult to build algorithms correctly.
In such situations, we break an algorithm into parts, construct each part separately, and then integrate the parts to the complete algorithm. The parts of an algorithm are known as functions.

Question 7.
Give an example for a function?
Answer:
Suppose we want to calculate the surface area of a cylinder of radius r and height h.
A = 2 πr² + 2πrh
We can identify two functions, one for calculating the area of a circle and the other for the circumference of the circle.
If we abstract the two functions as circle_area(r) and circle_circumference(r), then,
cylinder_area (r, h) can be solved as:
cylinder_area (r, h) = 2 X circle_area (r) + circle_circumference (r) X h.

Question 8.
What are the basic principles and techniques for designing algorithms?
Answer:
The basic principles and techniques for designing algorithms are:

• Specification.
• Abstraction.
• Composition.
• Decomposition.

Question 9.
Write the specification format and explain.
Answer:
Specification format:
We can write the specification in a standard three-part format:

• The name of the algorithm and the inputs.
• Input: the property of the inputs.
• Output: the desired input-output relation.

The first part is the name of the algorithm and the inputs. The second part is the property of the inputs. It is written as a comment which starts with – inputs: The third part is the desired input-output relation.
It is written as a comment which starts with — outputs: The input and output can be written using English and mathematical notation.

Question 10.
Write the specification of an algorithm for computing the square root of a number.
Answer:

• Let us name the algorithm square_root.
  it takes the number as the input. Let us name the input n. n should not be negative.
• It produces the square root of n as the output. Let us name the output y. Then n should be the square of y.

Now the specification of the algorithm is
a) square_root (n).
b) inputs: n is a real number, n > 0.
c) outputs: y is a real number such that y 2= n.

Question 11.
Give an example for abstraction.
Answer:

• A road map is designed for drivers. They do not usually worry about hills so most hills are ignored on a road map.
• A walker’s map is not interested in whether a road is a one-way street, so such details are ignored.

Part IV

Explain in detail

Question 1.
Explain the three control flow statement.
Answer:
There are three important control flow statements to alter the control flow depending on the state.

1. In sequential control flow, a sequence of statements is executed one after another in the same order as they are written.
2. In alternative control flow, a condition of the state is tested, and if the condition is true, one statement is executed; if the condition is false, an alternative statement is executed.
3. In iterative control flow, a condition of the state is tested, and if the condition is true, a statement is executed. The two steps of testing the condition and executing the statement are repeated until the condition becomes false.

Question 2.
What are the uses of the Operating System?
Answer:
The basic principles and techniques for designing algorithms are;

• Specification.
• Abstraction.
• Composition.
• Decomposition.

Specification: The first step in problem-solving is to state the problem precisely. A problem is specified in terms of the input given and the output desired. The specification must also state the properties of the given input, and the relation between the input and the output.

Abstraction: A problem can involve a lot of details. Several of these details are unnecessary for solving the problem. Only a few details are essential. Ignoring or hiding unnecessary details and modeling an entity only by its essential properties is known as abstraction. For example, when we represent the state of a process, we select only the variables essential to the problem and ignore inessential details.

Composition: An algorithm is composed of assignment and control flow statements. A control flow statement tests a condition of the state and, depending on the value of the condition, decides the next statement to be executed.

Decomposition: We divide the main algorithm into functions. We construct each function independently of the main algorithm and other functions. Finally, we construct the main algorithm using the functions.

Question 3.
Explain the specification format.
Answer:
Specification format: We can write the specification in a standard three-part format:

1. The name of the algorithm and the inputs
2. Input: the property of the inputs
3. Output: the desired input-output relation

The first part is the name of the algorithm and the inputs. The second part is the property of the inputs. It is written as a comment which starts with – inputs: The third part is the desired input-output relation. It is written as a comment which starts with outputs: The input and output can be written using English and mathematical notation.

Question 4.
Explain the state with a suitable example.
Answer:
State:
The state is a basic and important abstraction. Computational processes have stated. A computational process starts with an initial state. As actions are performed, its state changes. It ends with a final state.

The state of a process is abstracted by a set of variables in the algorithm. The state at any point of execution is simply the values of the variables at that point.

Example:
Chocolate Bars: A rectangular chocolate bar is divided into squares by horizontal and vertical grooves. We wish-to break the bar into individual squares.
To start with, we have the whole of the bar as a single piece. A cut is made by choosing a piece and breaking it along one of its grooves. Thus a cut divides a piece into two pieces. How many cuts are needed to break the bar into its individual squares? In this example, we will abstract the essential variables of the problem.

Essential variables:
The number of pieces and the number of cuts are the essential variables of the problem. We will represent them by two variables, p and c, respectively. Thus, the state of the process is abstracted by two variables p and c.

Irrelevant details:
The problem could be cutting a chocolate bar into individual pieces or cutting a sheet of postage stamps into individual stamps. It is irrelevant. The problem is simply cutting a grid of squares into individual squares.

The sequence of cuts that have been made and the shapes and sizes of the resulting pieces are irrelevant too. From p and c, we cannot reconstruct the sizes of the individual pieces. But, that is irrelevant to solving the problem.

Tamilnadu State Board New Syllabus Samacheer Kalvi 11th Physics Guide Pdf Chapter 10 Oscillations Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 11th Physics Solutions Chapter 10 Oscillations

11th Physics Guide Oscillations Book Back Questions and Answers

I. Multiple choice questions:

Question 1.
In a simple harmonic oscillation, the acceptation against displacement for one complete oscillation will be: (Model NSEP 2000 – 01)
(a) an ellipse
(b) a circle
(c) a parabola
(d) a straight line
Answer:
(d) a straight line

Hint:
The sketch between cause (magnitude of acceleration) and effect (magnitude of displacement) is a straight line.

Question 2.
A particle executing SHM crosses points A and B with the same velocity. Having taken 3 s in passing from A to B, it returns to B after another 3 s. The time period is:
(a) 15 s
(b) 6 s
(c) 12 s
(d) 9 s
Answer:
(c) 12 s

Hint:

The time period is the time taken by a particle to return to B.

Question 3.
The length of a second’s pendulum on the surface of the Earth is 0.9 m. The length of the same pendulum on the surface of planet X such that the acceleration of the planet X is n times greater than the Earth is:
(a) 0.9 n
(b) \(\frac { 0.9 }{ n }\)m
(c) 0.9 n²m
(d) \(\frac{0.9}{n^{2}}\)
Answer:
(a) 0.9 n

Hint:

Question 4.
A simple pendulum is suspended from the roof of a school bus which moves in a horizontal direction with an acceleration a, then the time period is:
(a) T ∝ \(\frac{1}{g^{2}+a^{2}}\)
(b) T ∝ \(\frac{1}{\sqrt{g^{2}+a^{2}}}\)
(c) T ∝ \(\sqrt{g^{2}+a^{2}}\)
(d) T ∝ (g² + a²)
Answer:
(b) T ∝ \(\frac{1}{\sqrt{g^{2}+a^{2}}}\)

Hint: T = 2π\(\sqrt{\frac{l}{g}}\)
When a bus is moving
g’ = \(\sqrt{g^{2}+a^{2}}\)
∴ T ∝ \(\frac{1}{\sqrt{g^{2}+a^{2}}}\)

Question 5.
Two bodies A and B whose masses are in the rati0 1:2 are suspended from two separate massless springs of force constants k_A and k_B respectively. If the two bodies oscillate vertically such that their maximum velocities are in the ratio 1:2, the ratio of the amplitude A to that of B is:
(a) \(\sqrt{\frac{k_{\mathrm{B}}}{2 k_{\mathrm{A}}}}\)
(b) \(\sqrt{\frac{k_{\mathrm{B}}}{8 k_{\mathrm{A}}}}\)
(c) \(\sqrt{\frac{2k_{\mathrm{B}}}{ k_{\mathrm{A}}}}\)
(d) \(\sqrt{\frac{8k_{\mathrm{B}}}{ k_{\mathrm{A}}}}\)
Answer:
(b) \(\sqrt{\frac{k_{\mathrm{B}}}{8 k_{\mathrm{A}}}}\)

Hint: v_A : v_B
Amplitude of A : Amplitude of B = \(\sqrt{\mathrm{K}_{\mathrm{B}}}: \sqrt{8 \mathrm{~K}_{\mathrm{A}}}\)

Question 6.
A spring is connected to a mass m Suspended from it and its time period for vertical oscillation is T. The spring is now cut into two equal halves and the same mass is suspended from one of the halves. The period of vertical oscillation is:
(a) T’ = \(\sqrt{2}\)T
(b) T’ = \(\frac{\mathrm{T}}{\sqrt{2}}\)
(c) T’ = \(\sqrt{2T}\)
(d) T’ = \(\sqrt{\frac{\mathrm{T}}{2}}\)
Answer:
(b) T’ = \(\frac{\mathrm{T}}{\sqrt{2}}\)

Hint:
T = 2π\(\sqrt{\frac{\mathrm{m}}{k}}\)
When the spring is cut into two equal halves, then the force constant of each part is 2k.
When the mass is suspended from one of the halves.
Time period T’ = 2π\(\sqrt{\frac{\mathrm{m}}{2k}}\)
= \(\sqrt{\frac{\mathrm{T}}{2}}\)

Question 7.
The time period for small vertical oscillations of block of mass m when the masses of the pulleys are negligible and spring constant k₁ and k₂ is:

(a) T = 4π\(\sqrt{m\left(\frac{1}{k_{1}}+\frac{1}{k_{2}}\right)}\)
(b) T = 2π\(\sqrt{m\left(\frac{1}{k_{1}}+\frac{1}{k_{2}}\right)}\)
(c) T = 4π\(\sqrt{m\left(k_{1}+k_{2}\right)}\)
(d) T = 2π\(\sqrt{m\left(k_{1}+k_{2}\right)}\)
Answer:
(a) T = 4π\(\sqrt{m\left(\frac{1}{k_{1}}+\frac{1}{k_{2}}\right)}\)

Hint:
T = 2π\(\frac { m }{ k }\)
The given arrangement is similar to the combination of springs in series.

Question 8.
A simple pendulum has a time period T₁. When its point of suspension is moved vertically upwards according as y = kt², where y is vertical distance covered and k = 1 ms^-2, its time period becomes T₂. Then, \(\frac{\mathrm{T}_{1}^{2}}{\mathrm{~T}_{2}^{2}}\) is (g = 10 ms^-2
(a) \(\frac { 5 }{ 6 }\)
(b) \(\frac { 11 }{ 10 }\)
(c) \(\frac { 6 }{ 5 }\)
(d) \(\frac { 5 }{ 4 }\)
Answer:
(c) \(\frac { 6 }{ 5 }\)

Hint:

Question 9.
An ideal spring of spring constant k, is suspended from the ceiling of a room and a block of mass m is fastened to its lower end. If the block is released when the spring is un-stretched, then the maximum extension in the spring is:
(a) 4\(\frac { mg }{ k }\)
(b) \(\frac { mg }{ k }\)
(c) 2\(\frac { mg }{ k }\)
(d) \(\frac { mg }{ 2k }\)
Answer:
(c) 2\(\frac { mg }{ k }\)

Hint:

Question 10.
A pendulum is hung in a very high building oscillates to and fro motion freely like a simple harmonic oscillator. If the acceleration of the bob is 16 ms^-2 at a distance of 4 m from the mean position, then the time period is: (NEET 2018 model)
(a) 2s
(b) 1s
(c) 2 πs
(d) πs
Answer:
(d) πs

Hint:
a = 16 m/s²; y = 4
a = – \(\frac { g }{ l }\)x = – ω²x
16 = \(\left|1-\omega^{2} \times 4\right|\)
∴ ω² = \(\frac { 16 }{ 4 }\) = 4
ω = 2
Time period T = \(\frac { 2π }{ ω }\) = πs

Question 11.
A hollow sphere is filled with water. It is hung by a long thread. As the water flows out of a hole at the bottom, the period of oscillation will:
(a) first increase and then decrease
(b) first decrease and then increase
(c) increase continuously
(d) decrease continuously
Answer:
(a) first increase and then decrease

Hint:
As the water flows out of the sphere, the time period first increases and then decreases. Initially, when the sphere is completely filled with water its centre of gravity (C.G) lies at its centre. As water flows out, the C.G begins to shift below the centre of the sphere.

The effective length of the pendulum increases and hence time period increases. When the sphere becomes more than half empty, its C.G begins to rise up. The effective length of the pendulum decreases and T decreases.

Question 12.
The damping force on an oscillator is directly proportional to the velocity. The units of the constant of proportionality are: (AIPMT 2012)
(a) kg m s^-1
(b) kg m s^-2
(c) kg s^-1
(d) kg s
Answer:
(c) kg s^-1

Hint:
F_d ∝ v
F_d = – bv
F_d = kv
∴ k = \(\frac{\mathrm{F}_{d}}{\nu}\)
Units of k = \(\frac{\mathrm{kgms}^{-2}}{\mathrm{~m} / \mathrm{s}}\)
= kg^-1
Units of proportionality constant = kgs^-1

Question 13.
When a damped harmonic oscillator completes 100 oscillations, its amplitude is reduced to\(\frac { 1 }{ 3 }\) of its initial value. What will be its amplitude when it completes 200 oscillations?
(a) \(\frac { 1 }{ 5 }\)
(b) \(\frac { 2 }{ 3 }\)
(c) \(\frac { 1 }{ 6 }\)
(d) \(\frac { 1 }{ 9 }\)
Answer:
(b) \(\frac { 2 }{ 3 }\)

Hint:

Question 14.
Which of the following differential equations represents a damped harmonic oscillator?
(a) \(\frac{d^{2} y}{d t^{2}}\) + y = 0
(b) \(\frac{d^{2} y}{d t^{2}}\) + γ \(\frac { dy }{ dt }\) + y = 0
(c) \(\frac{d^{2} y}{d t^{2}}\) + k²y = 0
(d) \(\frac { dy }{ dt }\) + y = 0
Answer:
(b) \(\frac{d^{2} y}{d t^{2}}\) + γ \(\frac { dy }{ dt }\) + y = 0

Hint:
For a damped oscillator F ∝ v
Total restoring force F = – ky – bv
b – damping constant; y – displacement
If F = – ky – by
then m\(\frac{d^{2} y}{d t^{2}}\) = – ky – b\(\frac { dy }{ dt }\)
m\(\frac{d^{2} y}{d t^{2}}\) + ky + b\(\frac { dy }{ dt }\) = 0
÷ m we get
\(\frac{d^{2} y}{d t^{2}}\) + \(\frac { b }{ m }\)\(\frac { dy }{ dt }\) + \(\frac { k }{ m }\)y = 0
If k = m and \(\frac { b }{ m }\) = r
then the equation becomes
\(\frac{d^{2} y}{d t^{2}}\) + r\(\frac { dy }{ dt }\) + y = 0

Question 15.
If the inertial mass and gravitational mass of the simple pendulum of length l are not equal, then the time period of the simple pendulum is:
(a) T = 2π\(\sqrt{\frac{m_{i} l}{m_{g} g}}\)
(b) T = 2π\(\sqrt{\frac{m_{g} l}{m_{i} g}}\)
(c) T = 2π\(\frac{m_{g}}{m_{i}} \sqrt{\frac{l}{g}}\)
(d) T = 2π\(\frac{m_{i}}{m_{g}} \sqrt{\frac{l}{g}}\)
Answer:
(a) T = 2π\(\sqrt{\frac{m_{i} l}{m_{g} g}}\)

Hint:

II. Short Answers Questions:

Question 1.
What is meant by periodic and non-periodic motion? Give any two examples, for each motion.
Answer:
Periodic motion: Any motion which repeats itself in a fixed time interval is known as periodic motion. Examples: Hands in a pendulum clock, the swing of a cradle.
Non-Periodic motion: Any motion which does not repeat itself after a regular interval of time is known as non-periodic motion. Example: Occurrence of Earthquake, the eruption of a volcano.

Question 2.
What is meant by the force constant of a spring?
Answer:
Force constant is defined as force per unit length.

Question 3.
Define the time period of simple harmonic motion.
Answer:
The time period is defined as the time taken by a particle to complete one oscillation. It is usually denoted by T.

Question 4.
Define frequency of simple harmonic motion.
Answer:
The number of oscillations produced by the particle per second is called frequency. It is denoted by f. SI unit for frequency is s^-1 or hertz (Hz).
Mathematically, frequency is related to time period by f = \(\frac{1}{\mathrm{T}}\)

Question 5.
What is an epoch?
Answer:
Initial phases of a particle is an epoch. At time t = 0 s (initial time), the phase φ = (φ₀ is called epoch (initial phase) where φ₀ is called the angle of epoch.

Question 6.
Write short notes on two springs connected in series.
Answer:
Let us consider two springs whose spring constant are k₁ and k₂ and which are connected to a mass m as shown in Figure.

Let F be the applied force towards right as shown in Figure. The net displacement of the mass point is
x = x₁ + x₂
From Hooke’s law, the net force,
F = – k_s(x₁ + x₂)
The effective spring constant can be calculated as

When n springs connected in series, the effective spring constant in series is

If all spring constants are identical
i.e., k₁ = k₂ = … = k_n = k then
\(\frac{1}{k_{s}}\) = \(\frac { n }{ k }\) ⇒ k_s = \(\frac { k }{ n }\)
This means that the effective spring constant reduces by the factor n. So, for springs in series connection, the effective spring constant is lesser than the individual spring constants.

Question 7.
Write short notes on two springs connected in parallel.
Answer:
Let us consider only two springs of spring constants k₁ and k₂ attached to a mass m as shown in Figure.

Net force for the displacement of mass m is F = – k_px … (1)
Where k_p is called effective spring constant. Let the first spring be elongated by a displacement x due to force F₁ and the second spring be elongated by the same displacement x due to force F₂, then the net force
F = – k₁x – k₂x … (2)
Equating equations (2) and (1), we get
k_p = k₁ + k₂ … (3)
Generalizing, for n springs connected in parallel,
k_p = \(\sum_{i=1}^{n} k_{i}\) … (4)
If all spring constants are identical i.e., k₁ = k₂ = … = k_n = k then
k_p = nk … (5)
It is implied that the effective spring constant increases by a factor n. So, for the springs in parallel connection, the effective spring constant is greater than the individual spring constant.

Question 8.
Write down the time period of simple pendulum.
Answer:
T = 2π\(\sqrt{\frac{l}{g}}\) in second.
where l – length of the pendulum.
g – acceleration due to gravity.

Question 9.
State the laws of simple pendulum.
Answer:
Laws of simple pendulum: The time period of a simple pendulum.

Depends on the following laws:
(i) Law of length: For a given value of acceleration due to gravity, the time period of a simple pendulum is directly proportional to the square root of length of the pendulum.
T ∝ \(\sqrt{l}\) … (1)

(ii) Law of acceleration: For a fixed length, the time period of a simple pendulum is inversely proportional to the square root of acceleration due to gravity.
T ∝ \(\frac{1}{\sqrt{g}}\) … (2)

Question 10.
Write down the equation of time period for linear harmonic oscillator.
Answer:
Time period T = \(\frac { 1 }{ f }\) = 2π \(\sqrt{\frac{m}{k}}\)s
where m is the mass, k is the spring constant.

Question 11.
What is meant by free oscillation?
Answer:
The oscillations in which the amplitude decreases gradually with the passage of time are called damped Oscillations.
Example:

1. The oscillations of a pendulum or pendulum oscillating inside an oil-filled container.
2. Electromagnetic oscillations in a tank circuit.
3. Oscillations in a dead beat and ballistic galvanometers.

Question 12.
Explain damped oscillation. Give an example.
Answer:
If an oscillator oscillates in a resistive medium, then its amplitude goes on decreasing. The motion of the oscillator is called damped oscillation.
Example:

• The oscillations of a pendulum (including air friction) or pendulum oscillating inside an oil-filled container.
• Electromagnetic oscillations in a tank circuit.

Question 13.
Define forced oscillation. Give an example.
Answer:
The body executing vibration initially vibrates with its natural frequency and due to the presence of external periodic force, the body later vibrates with the frequency of the applied periodic force. Such vibrations are known as forced vibrations.
Example: Soundboards of stringed instruments.

Question 14.
What is meant by maintained oscillation? Give an example.
Answer:
To avoid damping in an oscillation, energy is supplied from an external source, the amplitude of the oscillation can be made constant. Such vibrations are known as maintained vibrations.

Example:
The vibration of a tuning fork getting energy from a battery or from an external power supply.

Question 15.
Explain resonance. Give an example.
Answer:
The frequency of external periodic force (or driving force) matches with the natural frequency of the vibrating body (driven). As a result, the oscillating body begins to vibrate such that its amplitude increases at each step and ultimately it has a large amplitude. Such a phenomenon is known as resonance and the corresponding vibrations are known as resonance vibrations. Example: The breaking of glass due to sound

III. Long Answers Questions:

Question 1.
What is meant by simple harmonic oscillation? Give examples and explain why every simple harmonic motion is a periodic motion whereas the converse need not be true.
Answer:
Simple harmonic motion is a special type of oscillatory motion in which the acceleration or force on the particle is directly proportional to its displacement from a fixed point and is always directed towards that fixed point.

Example: Oscillation of a pendulum. SHM is a special type of periodic motion, where restoring force is proportional to the displacement and acts in the direction opposite to displacement.

Question 2.
Describe Simple Harmonic Motion as a projection of uniform circular motion.
Answer:
(i) Let us consider a particle of mass m moving with uniform speed v along the circumference of a circle whose radius is r in an anti-clockwise direction (as shown in Figure).

(ii) It is assumed that the origin of the coordinate System coincides with the center 0 of the circle.

(iii) If co is the angular velocity of the particle and 0 the angular displacement of the particle at any instant of time t, then θ = ωt. By projecting the uniform circular motion on its diameter a simple harmonic motion is obtained.

(iv) This means that we can associate a map (or a relationship) between uniform circular (or revolution) motion to vibratory motion.

(v) Conversely, any vibratory motion or revolution can be mapped to uniform circular motion. The position of a particle moving is projected on to its vertical diameter or on to a line parallel to vertical diameter.

(vi) Similarly, we can do it for horizontal axis or a line parallel to the horizontal axis.

Example: Let us consider a spring-mass system (or oscillation of pendulum) as shown in Figure. When the spring moves up and down (or pendulum moves to and fro), the motion of the mass or bob is mapped to points on the circular motion.

Thus, if a particle undergoes uniform circular motion then the projection of the particle on the diameter of the circle (or on a line parallel to the diameter) traces straight line motion that is simple harmonic in nature. The circle is known as the reference circle of the simple harmonic motion.

Question 3.
What is meant by angular harmonic oscillation? Compute the time period of angular harmonic oscillation.
Answer:

If a body is allowed to rotate freely about a given axis then the oscillation is known as the angular oscillation. The point at which the resultant torque acting on the body is taken to be zero. It is called mean position. If the body is displaced from the mean position, then the resultant torque acts such that it is proportional to the angular displacement. This torque has a tendency to bring the body towards the mean position.

Time period : Let \(\overline{θ}\) be the angular displacement of the body and the resultant torque \(\vec { τ }\) acting on the body is,
\(\vec { τ }\) ∝ \(\vec {θ}\) … (1)
\(\vec { τ }\) = – k\(\vec {θ}\) … (2)
K is the restoring torsion constant, that is torque per unit angular displacement. If I is the moment of inertia of the body and \(\vec { τ }\) ∝ \(\vec {α}\) is the angular acceleration then
\(\vec { τ }\) = I \(\vec{α}\) = k \(\vec {θ}\)
But \(\vec{α}\) = \(\frac{d^{2} \vec{\theta}}{d t^{2}}\) and therefore
\(\frac{d^{2} \vec{\theta}}{d t^{2}}\) = – \(\frac { k }{ I }\)\(\vec {θ}\) … (3)
This differential equation resembles simple harmonic differential equation.
By comparing equation (3) with simple harmonic motion given we get,
a = \(\frac{d^{2} y}{d t^{2}}\) = – ω²y, we have
ω = \(\sqrt{\frac{k}{I}}\) rads^-1 … (4)
The frequency of the angular harmonic motion is given equation ω = 2πf is
f = \(\frac { 1 }{ 2π }\) \(\sqrt{\frac{k}{I}}\)Hz … (5)
The time period is given equation is
T = \(\frac { 1 }{ f }\); T = 2π\(\sqrt{\frac{I}{k}}\) second
In angular simple harmonic motion, the displacement of the particle is measured in terms of angular displacement \(\vec {θ}\).

Question 4.
Write down the difference between simple harmonic motion angular simple harmonic motion.
Answer:
Comparison of simple harmonic motion and angular simple harmonic motion.

Question 5.
Discuss the simple pendulum in detail.
Answer:
Construction:
A pendulum is a mechanical system which exhibits periodic motion. It has a bob with mass m suspended by a massless and inextensible string. The other end is fixed on a stand as shown in Figure (a). At equilibrium, the pendulum does not oscillate and is suspended vertically downward.

Such a position is known as mean position or equilibrium position. When a pendulum is displaced through a small displacement from its equilibrium position and released, the bob of the pendulum executes to and fro motion.

Calculation of time period: Let l be the length of the pendulum which is taken as the distance between the point of suspension and the centre of gravity of the bob. Two forces act on the bob of the pendulum at any displaced position, as shown in Figure (d),

• The gravitational force acting on the body (F = mg) acts vertically downwards.
• The tension in the string T acts along the string to the point of suspension.

Resolving the gravitational force into its components:

• Normal component: It is along the string but in opposition to the direction of tension, F_as = mg cosθ.
• Tangential component: It is perpendicular to the string i.e., along the tangential direction of arc of the swing, F_ps = mg sinθ.

Hence, the normal component of the force is, along the string,
T – W_as = m\(\frac{v^{2}}{l}\)
Here v is speed of bob
T – mg cosθ = m\(\frac{v^{2}}{l}\) … (1)
From the Figure, it is observed that the tangential component W_ps of the gravitational force always points towards the equilibrium position. This direction always points opposite to the direction of displacement of the bob from the mean position. Hence, in this case, the tangential force is the restoring force. Applying Newton’s second law along tangential direction, we have

Where, s is the position of bob that is measured along the arc. Expressing arc length in terms of angular displacement i.e.,
s = lθ … (3)
Then its acceleration,
\(\frac{d^{2} \theta}{d t^{2}}\) = \(\frac{d^{2} \theta}{d t^{2}}\) … (4)
Substituting equation (4) in equation (2), we get,
l\(\frac{d^{2} \theta}{d t^{2}}\) = – g sin θ
\(\frac{d^{2} \theta}{d t^{2}}\) = – \(\frac { g }{ l }\) sin θ … (5)
Because of the presence of sinθ in the above differential equation, it is a nonlinear differential equation. It is assumed that “the small oscillation approximation”, sin θ ≈ θ, the above differential equation becomes linear differential equation.
\(\frac{d^{2} \theta}{d t^{2}}\) = – \(\frac { g }{ l }\) θ
It is known as oscillatory differential equation. Hence, the angular frequency of this oscillator (natural frequency of this system) is

Question 6.
Explain the horizontal oscillations of a spring.
Answer:

Let us consider a system containing a block of mass m fastened to a massless spring with stiffness constant or force constant or spring constant k placed on a smooth horizontal surface (frictionless surface) as shown in Figure. Let x₀ be the equilibrium position or mean position of mass m when it is left undisturbed.

When the mass is displaced through a small displacement x towards right from its equilibrium position and then released, it will oscillate back and forth about its mean position x₀. Let F be the restoring force (due to stretching of the spring) that is proportional to the amount of displacement of block: For one-dimensional motion, we get
F ∝ x
F = – kx
where negative sign implies that the restoring force will always act opposite to the direction of the displacement. This equation is called Hooke’s law. It is noticed that, the restoring force is linear with the displacement (i.e., the exponent of force and displacement are unity). This is not always true. If we apply a very large stretching force, then the amplitude of oscillations becomes very large.
m\(\frac{d^{2} x}{d t^{2}}\) = – kx
\(\frac{d^{2} x}{d t^{2}}\) = – \(\frac { k }{ m }\)x … (1)
Comparing the equation (1) with simple harmonic motion equation a = \(\frac{d^{2} y}{d t^{2}}\) = – ω²y, we get
ω² = \(\frac { k }{ m }\)
which means the angular frequency or natural frequency of the oscillator is
ω = \(\sqrt{\frac{k}{m}}\)rad s^-1 … (2)
The frequency of the oscillation is
f = \(\frac { ω }{ 2π }\) = \(\frac { 1 }{ 2π }\)\(\frac { k }{ m }\) Hertz … (3)
and the time period of the oscillation is
T = \(\frac { 1 }{ f }\) = 2π[/latex]\(\frac { m }{ k }\) seconds … (4)

Question 7.
Describe the vertical oscillations of a spring.
Answer:
Consider a massless spring with stiffness constant or force constant k attached to a ceiling as shown in Figure. Let the length of the spring before loading mass m be L. If the block of mass m is attached to the other end of the spring, then the spring elongates by a length l. Let F₁ be the restoring force due to the stretching of spring. Due to mass m, the gravitational force acts vertically downward. A free-body diagram is drawn for this system as shown in Figure. When the system is under equilibrium,

F₁ + mg = 0 … (1)
But the spring elongates by small displacement l,
∴ F₁ ∝ l ⇒ F₁ = – kl … (2)
Substituting equation (2) in equation (1), we get
– kl + mg = 0
mg = kl
(or) \(\frac { m }{ k }\) = \(\frac { 1 }{ g }\) … (3)
Suppose a very small external force is applied on the mass such that the mass further displaces downward by a displacement y, then it will oscillate up and down. Now, the restoring force due to this stretching of spring (total extension of spring is y + l) is
F₂ (y + 1)
F₂ = – k(y + 1) = – ky – kl … (4)
Since, the mass moves up and down with acceleration , by drawing the free body diagram for this case, we get
-ky – kl + mg = m\(\frac{d^{2} y}{d t^{2}}\) … (5)
The net force acting on the mass due to this stretching is
F = F₂ + mg
F = – ky – kl + mg … (6)
The gravitational force opposes the restoring force. Substituting equation (3) in equation (6), we get
F = – ky – kl + kl = ky
Time period:
Applying Newton’s law, we get
m\(\frac{d^{2} y}{d t^{2}}\) = – ky
\(\frac{d^{2} y}{d t^{2}}\) = – \(\frac { k }{ m }\)y … (7)
The above equation is in the form of simple harmonic differential equation. Hence the time period is
T = 2π \(\sqrt{\frac{m}{k}}\)second … (8)
The time period can be rewritten using equation (3) as
T = 2π \(\sqrt{\frac{m}{k}}\) = 2π \(\sqrt{\frac{l}{g}}\)second.

Question 8.
Write short notes on the oscillations of the liquid column in U-tube.
Answer:
Let us consider a U-shaped glass tube which consists of two open arms with uniform cross¬sectional area A. Let us pour a non-viscous uniform incompressible liquid of density p in the U-shaped tube to a height h as shown in the Figure. If the liquid and tube are not disturbed then the liquid surface will be in equilibrium position O.

It means the pressure as measured at any point on the liquid is the same and also at the surface on the arm (edge of the tube on either side), that balances the atmospheric pressure. Hence, the level of liquid in each arm will be the same. By blowing air one can provide sufficient force in one arm, and the liquid gets disturbed from equilibrium position O, It is meant, that pressure at blown arm is higher than the other arm.

A difference in pressure is created that will cause the liquid to oscillate for a very short duration of time about the mean or equilibrium position. Finally, it comes to rest.
Time period of the oscillation is
T= 2π \(\sqrt{\frac{l}{2g}}\)second

Question 9.
Discuss in detail the energy in simple harmonic motion.
Answer:
(i) Expression for Potential Energy:For the simple harmonic motion, the force and the displacement are related by Hooke’s law
\(\vec { F }\) = – k\(\vec { r }\)
F = – kx … (1)
the work done by the conservative force field is independent of path.
Calculation potential energy:
F = \(\frac { dU }{ dx }\) … (2)
Comparing (1) and (2), we get
\(\frac { dU }{ dx }\) = – kx
dU = – kx dx
This work done by the force F during a small displacement dx stores as potential energy

From equation,
ω = \(\sqrt{\frac{k}{m}}\) rad s^-1
By substituting the value of force constant k = mω² in equation (3), we get
U(x) = \(\frac { 1 }{ 2 }\)mω²x² … (4)
where ω is the natural frequency of the oscillating system. For the particle executing simple harmonic motion from the equation,
y = A sin ωt
we get,
x = A sin ωt
U(t) = \(\frac { 1 }{ 2 }\)mω²x² … (5)
This variation of U is shown below.

(ii) Expression for Kinetic Energy:
Kinetic energy
KE = \(\frac { 1 }{ 2 }\)mv_x² = \(\frac { 1 }{ 2 }\)m(\(\frac { dx }{ dt }\))² … (6)
Since the particle executes simple harmonic motion, from equation y = A sin ωt
x = A sin ωt
∴ velocity is

(iii) Expression for Total Energy: Total energy is the sum of kinetic energy and potential energy.
E = KE + U … (11)
E = \(\frac { 1 }{ 2 }\)mω²(A² – x²) + \(\frac { 1 }{ 2 }\)mω²x² … (12)
Hence, cancelling x² term,
E = \(\frac { 1 }{ 2 }\)mω²x² = r constant … (13)
Alternatively, from equation (5) and equation (10), we get the total energy as
E = \(\frac { 1 }{ 2 }\)mω²x² sin²ωt + \(\frac { 1 }{ 2 }\)mω²A²cos²ωt
= \(\frac { 1 }{ 2 }\)mω²A² (sin²ωt + cos²ωt)
From trigonometry identity,
(sin² ωt + cos² ωt) = 1
E = \(\frac { 1 }{ 2 }\)mω²A² = constant
which gives the law of conservation of total energy.

Question 10.
Explain in detail the four different types of oscillations.
Answer:
(i) Free oscillations: When the oscillator oscillates with a frequency that is equal to the natural frequency of the oscillator. Such an oscillation or vibration is known as free oscillation or free vibration.

Example:

• Oscillation of a simple pendulum,
• Vibration in a stretched string.

(ii) Damped oscillation: If an oscillator oscillates in a resistive medium, then its amplitude goes on decreasing. The energy of the oscillator is used to do work against the resistive medium. The motion of the oscillator is said to be a damped oscillation.

Example:

• The oscillations of a pendulum (including air friction) or pendulum oscillating inside an oil filled container.
• Electromagnetic oscillations in a tank circuit.

(iii) Forced oscillations: In this type of vibration, the body executing vibration initially vibrates with its natural frequency. Because of the presence of external periodic force, the body later vibrates with the frequency of the applied periodic force. Such vibrations are known as forced vibrations.

Example:
Soundboards of stringed instruments.

(iv) Maintained oscillations: The amplitude of the oscillation can be made constant. By supplying energy from an external source. Such oscillations are known as maintained oscillations.

Example:
The vibration of a tuning fork getting energy from a battery or from external power supply.

IV. Numerical Problems:

Question 1.
Consider the Earth as a homogeneous sphere of radius R and a straight hole is bored in it through its centre. Show that a particle dropped into the hole will execute a simple harmonic motion such that its time Period is T = 2π\(\sqrt{\frac{\mathrm{R}}{g}}\)
Answer:

(Here, negative has no meaning. It can be neglected)
Comparing equation (1) & (2) we get,

Time period, T = 2π\(\sqrt{\frac{\mathrm{R}}{g}}\)
Hence proved.

Question 2.
Calculate the time period of the oscillation of a particle of mass m moving in the potential defined as
Answer:

In the problem consider oscillation of particle into 2 cases via x < 0 (consider it as SHM where the time period is considered as t₁) and another one as x > 0 (consider it as a motion under gravity, where time period is t₂)

Note:
We want to find the total time period, which will be T = t₁ + t₂.
According to the conservation of energy

In case: 2 (Motion under gravity)
t₂ = \(\frac { 2v }{ g }\) substituting equation (2) here we get,
t₂ = \(\frac { 2 }{ g }\)\(\sqrt{\frac{2 E}{m}}\)
⇒ 2\(\sqrt{\frac{2 \mathrm{E}}{m g^{2}}}\) … (4)
Adding equation (3) & (4)
Time period of oscillation,
T = t₁ + t₂
= π\(\sqrt{\frac{m}{k}}\) + 2\(\sqrt{\frac{2 \mathrm{E}}{m g^{2}}}\)

Question 3.
Consider a simple pendulum of length l = 0.9 m which is properly placed on a trolley rolling down on a inclined plane which is at θ = 45° with the horizontal. Assuming that the inclined plane is frictionless, calculate the time period of oscillation of the simple pendulum.
Answer:
The effective value of acceleration due to gravity (g) will be equal to the component of g normal to the inclined plane which is
g’ = g cos α
T = 2π\(\sqrt{\frac{l}{g^{\prime}}}\) = 2π\(\sqrt{\frac{l}{g \cos \theta}}\)
Length of the pendulum l = 0.9m
Angle of inclination θ = 45°

Question 4.
A piece of wood of mass m is floating erect in a liquid whose density is ρ. If it is slightly pressed down and released, then executes simple harmonic motion. Show that its time period of oscillation is T = 2π\(\sqrt{\frac{m}{\mathrm{Ag} \rho}}\)
Answer:
When a wood is pressed and released,

Question 5.
Consider two simple harmonic motion along x and y-axis having same frequencies but different amplitudes as x = A sin (ωt + φ) (along x axis) and y = B sin ωt (along y axis). Then show that \(\frac{x^{2}}{\mathrm{~A}^{2}}+\frac{y^{2}}{\mathrm{~B}^{2}}-\frac{2 x y}{\mathrm{AB}}\) cosφ = sin²φ and also discuss the special cases when
(i) φ = 0
(ii) φ = π
(iii) φ = \(\frac { π }{ 2 }\)
(iv) φ = \(\frac { π }{ 2 }\) and A = B
(v) φ = \(\frac { π }{ 4 }\)
Note: when a particle is subjected to two simple harmonic motions at right angle to each other the particle may move along different paths. Such paths are called Lissajous figures.
Given:
x = A sin(ωt-φ) … (1)
y = B sin ωt … (2)
In equation (1) use,
sin (A – B) – sin A cos B + cos A sin B
(1) ⇒ x – A sin ωt. cos (φ) + A cos ωt. sinφ
x – A sin cat. cos φ = A cos cot sin φ
squaring on both sides we get,
(x – A sin cot. cos φ)² = A² cos²cot sin²φ … (3)
In equation (3) sin at can be re-written as, \(\frac { y }{ B }\) [from equation (2)]. Also, use
cos²cot = 1 – sin²ωt in equation (3)
∴ (3) becomes

Hence proved.

Special cases:
(i) φ = 0 in equation (5) we get,

The above equation resembles equation of a straight line passing through origin with positive slope.

(ii) φ = π in equation (5)

The above equation is an equation of a straight line passing through origin with a negative slope.

(iii) φ = \(\frac { π }{ 2 }\) in equation (5)
The above equation of an ellipse whose centre is origin.

(iv) φ = \(\frac { π }{ B }\) and A = B in equation (5)
\(\frac{x^{2}}{\mathrm{~A}^{2}}+\frac{y^{2}}{\mathrm{~A}^{2}}\) = 1
⇒ x² + y² = A²
The above equation of a circle whose centre is origin.

(v) φ = \(\frac { π }{ 4 }\), cos \(\frac { π }{ 4 }\) = \(\frac{1}{\sqrt{2}}\) sin\(\frac { π }{ 4 }\) = \(\frac{1}{\sqrt{2}}\) equation (5) we get,
\(\frac{x^{2}}{\mathrm{~A}^{2}}+\frac{y^{2}}{\mathrm{~A}^{2}}\) – \(\frac{(\sqrt{2}) x y}{A B}\) = \(\frac { 1 }{ 2 }\)
The above equation is an equation of tilted ellipse.

Question 6.
Show that for a particle executing simple harmonic motion,
(a) the average value of kinetic energy is equal to the average value of potential energy,
(b) average potential energy = average kinetic energy = \(\frac { 1 }{ 2 }\) (total energy)
Hint: average kinetic energy = < kinetic energy > = \(\frac{1}{\mathrm{~T}} \int_{0}^{\mathrm{T}}(\text { Potential energy }) d t\) and average potential energy = < potential energy > = \(\frac{1}{\mathrm{~T}} \int_{0}^{\mathrm{T}}(\text { Potential energy }) d t\)
Answer:
(a) Suppose a particle of mass m executes SHM of time period T. The displacement of the particle at any instant t is given by
y = A sin ωr … (1)
Velocity v = \(\frac { dy }{ dt }\) = \(\frac { d }{ dt }\)(sin ωt) = Aω cos ωt = ωA cosωt

Average potential energy over a period of oscillation is,

(b) Total energy
T.E = \(\frac { 1 }{ 2 }\) ω²y² + \(\frac { 1 }{ 2 }\)mω²(A² – y²)
But y = A sinωt
T.E = \(\frac { 1 }{ 2 }\)mω²A² ωt + \(\frac { 1 }{ 2 }\)mω²A² cos²ωt
= \(\frac { 1 }{ 2 }\)mω²A²(sin²ωt + cos²ωt)
From trignometry identity
sin² ωt + cos² ωt = 1

Question 7.
Compute the time period for the following system if the block of mass m is slightly displaced vertically down from its equilibrium position and then released. Assume that the pulley is light and smooth, strings and springs are light.
Answer:

Case (a):
When mass is slightly displaced vertically down: Now pulley is fixed rigidly here. When the mass is displaced by y and the spring will also be stretched by y.
Hence F = ky
Time period T = \(\sqrt{\frac{m}{k}}\)

case (b):
When the system is released: WTien mass is displaced by y, pulley is also displaced by 4y,
∴ F = 4 Icy
∴ T = 2π\(\sqrt{\frac{m}{4k}}\)

Tamilnadu State Board New Syllabus Samacheer Kalvi 11th Computer Science Guide Pdf Chapter 5 Working with Typical Operating System (Windows & Linux) Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 11th Computer Science Solutions Chapter 5 Working with Typical Operating System (Windows & Linux)

11th Computer Science Guide Working with Typical Operating System (Windows & Linux) Text Book Questions and Answers

Part I

Choose the correct answer.

Question 1.
From the options given below, choose the operations managed by the operating system.
a) Memory
b) Processor
c) I/O devices
d) all of the above
Answer:
d) all of the above

Question 2.
Which is the default folder for many Windows Applications to save your file?
a) My Document
b) My Pictures
c) Documents and Settings
d) My Computer
Answer:
a) My Document

Question 3.
Under which of the following OS, the option Shift + Delete – permanently delete a file or folder?
a) Windows 7
b) Windows 8
c) Windows 10
d) None of the OS
Answer:
a) Windows 7

Question 4.
What is the meaning of “Hibernate” in Windows XP/Windows 7?
a) Restart the Computer in safe mode
b) Restart the Computer in hibernate mode
c) Shutdown the Computer terminating a!! the running applications
d) Shutdown the Computer without closing the running applications
Answer:
d) Shutdown the Computer without closing the running applications

Question 5.
Which of the following OS is not based on Linux?
a) Ubuntu
b) Redhat
c) CentOs
d) BSD
Answer:
d) BSD

Question 6.
Which of the following in Ubuntu OS is used to view the options for the devices installed?
a) Settings
b) Files
c) Dash
d) VBox_GAs_5.2.2
Answer:
b) Files

Question 7.
Identify the default email client in Ubuntu.
a) Thunderbird
b) Firefox
c) Internet Explorer
d) Chrome
Answer:
a) Thunderbird

Question 8.
Which is the default application for spreadsheets in Ubuntu? This is available in the software launcher.
a) LibreOffice Writer
b) LibreOffice Calc
c) LibreOffice Impress
d) LibreOffice Spreadsheet
Answer:
b) LibreOffice Calc

Question 9.
Which is the default browser for Ubuntu?
a) Firefox
b) Internet Explorer
c) Chrome
d) Thunderbird
Answer:
a) Firefox

Question 10.
Where will you select the option to log out, suspend, restart, or shut down from the desktop of Ubuntu OS?
a) Session Indicator
b) Launcher
c) Files
d) Search
Answer:
a) Session Indicator

Part – II

Short Answers

Question 1.
Differentiate cut and copy options.
Answer:

Question 2.
What is the use of a file extension?
Answer:
File Extension is the second part of the file name. It succeeds the decimal point in the file name. It is used to identify the type of file and it is normally upto 3 to 4 characters long.
Example: exe, html.

Question 3.
Differentiate Files and Folders.
Answer:

Question 4.
Differentiate Save and Save As option.
Answer:

Question 5.
What is open source?
Answer:
Open source refers to a program or software in which the source code is available in the web to all public, without any cost.

Question 6.
What are the advantages of open source?
Answer:
The reasons individuals or organizations choose open source software are:

1. lower cost
2. security
3. no vendor ‘lock-in’
4. better quality

Question 7.
Mention the different server distributions in Linux OS.
Answer:
The server distribution in Linux OS:

1. Ubuntu Linux
2. Linux Mint
3. Arch Linux
4. Deepin
5. Fedora
6. Debian
7. Centos

Question 8.
How will you log off from Ubuntu OS?
Answer:
When you have finished working on your computer, you can choose to Log Out through the Session Indicator on the far right side of the top panel.

Part – III

Explain in brief

Question 1.
Analyse: Why the drives are segregated?
Answer:

1. It saves space and increases system performance.
2. Sharing and protection.
3. Segment and segregate the data to defend it from cyber-attacks.

Question 2.
If you are working on multiple files at a time, sometimes the system may hang. What is the reason behind it. How can you reduce it?
Answer:
Too Many Applications Running :
Each application open on the system takes some internal and hardware resources to keep it running. If multiple apps and programs are running, your PC may run low on resources as memory is used by a number of applications.

Device Driver Issues:
Outdated or damaged drivers can also be the reason behind frequent computer freezes. If video drivers being installed on your system are not updated, the computer might hang up while you attempt to play a video or game on the system.

Operating System Issues:
To ensure the smooth functioning of the machine, make sure that all updates are installed. To be able to keep the system updated, it is vital that you use a legal copy of the operating system.

Excess Heating Up:
If the temperature of your system processor is higher than usual, the chances are that the computer may freeze.

Hardware Misconfigyratioo:
One major reason behind the computer freeze issue is hardware misconfiguration, This may have occurred due to misconfigured hardware component that you recently added to the computer. Alternatively, the hardware component you added recently may be incompatible with the computer.

Question 3.
Are drives such as hard drive and floppy drives represented with drive letters? If so why, if not why?
Answer:
Yes, hard drives and floppy drives are represented with drive letters.
A: drive is used for floppy disk of 3.5 inches and storage capacity of 1.44 MB.
B: drive is for floppy of size 5.25 inches and of storage capacity of 1.2 MB
So, we can say like
A: First Floppy Drive
B: Second Floppy Drive
C: D : E: …………….. Z: Hard Disk Drives, CD/DVD

Question 4.
Write the specific use of Cortana.
Answer:
Cortana is your personal digital assistant on Windows 10 to help you find virtually anything on your device, track your packages and flights, inform you about weather and traffic information, manage your calendar and create reminders, and it can even tell you jokes.

Question 5.
List out the major differences between Windows and Ubuntu OS.
Answer:

Question 6.
Are there any difficulties you face while using Ubuntu? If so, mention it with reasons.
Answer:

1. Ubuntu has less hardware support for commercial/industrial/medical/ logistical therefore it’s less voted for use in big-time backends.
2. Ubuntu doesn’t support middlewares such as C panel, cloud Linux and a plethora of other infrastructure or monitoring tools.
3. Hard to install graphic drivers especially for old hardware. It is not possible to play modern games, because of poor graphics quality.
4. The user switching from windows will not like the user experience on Ubuntu and will have difficulty in operating the OS.
5. Ubuntu is not capable of playing MP3 files by default.

Question 7.
Differentiate Thunderbird and Firefox in Ubuntu OS.
Answer:

• Firefox is a browser is access the internet.
• Thunderbird is an email client. We can install it on our computer and view our emails.
• Both Firefox and Thunderbird are Mozilla products.

Question 8.
Differentiate Save, Save As, and Save a Copy in Ubuntu OS.
Answer:
Save: This will save the document without asking for a new name or location. It will overwrite the original.

Save As: This will prompt you to save the document using a dialog box. You will have the ability to change the file name and/or location.

Save A Copy: This will prompt you to save a ‘copy’ using the same dialog box as ‘save as’. You will have the ability to change the file name and/or location. If you choose the same file name and location it will overwrite the original.

If you changed the name or location of the document you will be working on the original document, not the copy. This means that if you make additional changes and then hit save the original will be overwritten with the new changes, but the copy you saved earlier will be left at the state of the Save A Copy.

Part IV

Explain in detail

Question 1.
Explain the versions of the Windows Operating System.
Answer:
Versions of Windows Operating System

Question 2.
Draw and compare the scan equivalence in Windows and Ubuntu.
Answer:

Question 3.
Complete the following matrix.

Answer:

Question 4.
Observe the figure and mark all the window elements. Identify the version of the Windows OS.
Answer:
The element of a windows

Question 5.
Write the procedure to create, rename, delete and save a file in Ubuntu OS. Compare it with Windows OS.
Answer:
The procedure to create, rename, delete and save a file in Ubuntu OS

Creating Files:

• We can create the files with the same procedure by clicking the Files icon,
• The following Figure shows the method of creating a File by right-clicking on the Desktop,

A new File can also be created by using File menu.

Deleting a File: A file created by us can be moved to trash by using right-click or by using the menu.

Deleting a File: Deleting a File by using the Edit menu.

Rename a file:

• Select the file.
• Right dick on the selected file and select Rename.
• Type the new filename and then, press Enter

The procedure to create, rename, delete and save a file in Windows OS

To create a file:

• Open the application using the Start button or through Icon or using the Run command.
• Enter the content.
• Save the file using Ctrl + S.

Renaming Files:
Using the FILE Menu

• Select the File you wish to Rename.
• Click File → Rename.
• Type in the new name.
• To finalize the renaming operation, press Enter.

To delete a file:
Select the file or folder you wish to delete.

• Right-click the file or folder, select the Delete option from the pop-up menu, or Click
  File → Delete or press the Delete key from the keyboard.
• The file will be deleted and moved to the Recycle bin.

To save a file:
Select the Save option from File Menu OR press Ctrl + S and then enter the file name and press OK.

11th Computer Science Guide Working with Typical Operating System (Windows & Linux) Additional Questions and Answers

Part I & Part II

Part – I

Choose the correct answer:

Question 1.
………………. is an Open source Operating System for desktop and server.
(a) Windows series
(b) Android
(c) iOS
(d) Linux
Answer:
(d) Linux

Question 2.
__________enables the hardware to communicate and operate with other software.
a) Loader
b) Compiler
c) Interpreter
d) Operating System
Answer:
d) Operating System

Question 3.
If you want to select multiple files or folders, use ……………….
(a) Ctrl + shift
(b) Ctrl + click
(c) shift + click
(d) Ctrl + shift + click
Answer:
(b) Ctrl + click

Question 4.
__________controls the overall execution of the computer.
a) Loader
b) Compiler
c) Interpreter
d) Operating System
Answer:
d) Operating System

Question 5.
………………. is one of the popular Open Source versions of the UNIX Operating System.
(a) Windows 7
(b) Windows 8
(c) Linux
(d) Android
Answer:
(c) Linux

Question 6.
The most popular Operating System for desktop and laptop computers.
a) Windows Series
b) Android
c) iOS
d) Linux
Answer:
a) Windows Series

Question 7.
………………. icon is the equivalent of Recycle bin of windows OS. All the deleted Files and Folders are moved here.
(a) Trash
(b) Files
(c) Online shopping
(d) Libre Office Impress
Answer:
(a) Trash

Question 8.
The most popular Operating System for Apple phones, iPad, and iPods.
a) Windows Series
b) Android
c) iOS
d) Linux
Answer:
c) iOS

Question 9.
………………. manages network connections, allowing you to connect to a wired or wireless network.
(a) Toolbar
(b) Title bar
(c) Session indicator
(d) Network indicator
Answer:
(d) Network indicator

Question 10.
Multiple applications can execute simultaneously in Windows, and this is known as __________
a) Multitasking
b) Multiuser
c) Parallel processing
d) None of these
Answer:
a) Multitasking

Question 11.
Clock is available in ……………….
(a) system tray
(b) Files
(c) start
(d) My documents
Answer:
(a) system tray

Question 12.
Windows Operating System uses __________as input device.
a) Keyboard
b) Mouse
c) Both A and B
d) None of these
Answer:
c) Both A and B

Question 13.
The menu bar is present below the ……………….
(a) Taskbar
(b) Scroll bar
(c) Title bar
(d) Function bar
Answer:
(c) Title bar

Question 14.
__________ is used to enter alphabets, numerals and special characters.
a) Keyboard
b) Mouse
c) Scanner
d) Optical Character Reader
Answer:
a) Keyboard

Question 15.
………………. has the task for frequently used applications?
(a) Quick Launch Tool bar
(b) Settings
(c) My pc
(d) This pc
Answer:
(a) Quick Launch Toolbar

Question 16.
__________program is an application program.
a) Word processing
b) Games and Spreadsheets
c) Calculator
d) All the above
Answer:
d) All the above

Question 17.
SSD stands for ……………….
(a) Solid State Devices
(b) Simple Stage Driver
(c) Single State Drivers
(d) Synchronized State Devices
Answer:
(a) Solid State Devices

Question 18.
__________is a file management activity.
a) Creating and Modifying file
b) Saving a file
c) Deleting a file
d) All the above
Answer:
d) All the above

Question 19.
What is the name given to the document window to enter or type the text?
(a) Workspace
(b) Work Area
(c) Typing Area
(d) Space
Answer:
(a) Workspace

Question 20.
Windows 1.x introduced in the year __________
a) 1992
b) 1987
c) 1985
d) 1982
Answer:
c) 1985

Question 21.
The disk drives mounted in the system can be seen by clicking ……………….
(a) Disk drive Icon
(b) Drive Icon
(c) Device Driver Icon
(d) My Computer Icon
Answer:
(d) My Computer Icon

Question 22.
Windows 3.x introduced in the year __________
a) 1992
b) 1987
c) 1985
d) 1982
Answer:
a) 1992

Question 23.
Windows 10 was developed in the year ……………….
(a) 2009
(b) 2012
(c) 2015
(d) 2018
Answer:
(c) 2015

Question 24.
Windows 98 introduced in the year __________
a) 1992
b) 1988
c) 1998
d) 1995
Answer:
c) 1998

Question 25.
The Rulers are used to set ……………….
(a) Orientations
(b) Header
(c) Footer
(d) Margins
Answer:
(d) Margins

Question 26.
Windows-XP introduced in the year __________
a) 2002
b) 2000
c) 1990
d) 2001
Answer:
d) 2001

Question 27.
Which functional key is used to bring the focus on, the first menu of the menu bar?
(a) F5
(b) F10
(c) F11
(d) F7
Answer:
(b) F10

Question 28.
Windows-7 introduced in the year __________
a) 2002
b) 2007
c) 2009
d) 2010
Answer:
c) 2009

Question 29.
Which one of the following is used to open the search results dialog box?
(a) search
(b) See more results
(c) search more results
(d) searching web
Answer:
(b) See more results

Question 30.
Windows-10 introduced in the year __________
a) 2012
b) 2015
c) 2009
d) 2010
Answer:
b) 2015

Question 31.
The keyboard shortcut to save a file is ……………….
(a) alt + s
(b) Ctrl + s
(c) Ctrl + alt + s
(d) winkey + s
Answer:
(b) Ctrl + s

Question 32.
In which version Start button window introduced.
a) Windows-XP
c) Windows 2.x
b) Windows 3.x
d) Windows 95
Answer:
d) Windows 95

Question 33.
Applications or files or folders are opened using related shortcut icons by ……………….
(a) Click and drag
(b) double click
(c) click
(d) drag and drop
Answer:
(b) double click

Question 34.
In which Windows version plug and play was introduced.
a) Windows-XP
b) Windows 98
c) Windows-Vista
d) Windows 95
Answer:
b) Windows 98

Question 35.
Which option is used to save the file?
(a) Ctrl + s
(b) Save
(c) File + save
(d) All the above
Answer:
(d) All the above

Question 36.
Which Windows version was designed to act as servers in the network.
a) Windows-XP
b) Windows 98
c) Windows-Vista
d) Windows-NT
Answer:
d) Windows-NT

Question 37.
ubuntu supports an office suite called ……………….
(a) Open Office
(b) Star Office
(c) Libre Office
(d) MS – Office
Answer:
(c) Libre Office

Question 38.
__________versions of Windows 2000 were released.
a) 6
b) 5
c) 4
d) 3
Answer:
c) 4

Question 39.
Which one of the following is a server distribution of Linux?
(a) Deepin
(b) Firefox
(c) MS.word
(d) Files
Answer:
(a) Deepin

Question 40.
Which version of Windows 2000 released for both a Web server and an office server.
a) Professional
b) Data Centre Server
c) Advanced Server
d) Server
Answer:
d) Server

Question 41.
Which option is used to delete all files in the Recycle bin?
(a) Remove the Recycle bin
(b) Empty the Recycle bin
(c) Clear the Recycle bin
(d) Clean the Recycle bin
Answer:
(b) Empty the Recycle bin

Question 42.
Which version of Windows 2000 released for high-traffic computer networks.
a) Professional
b) Data Centre Server
c) Advanced Server
d) Server
Answer:
b) Data Centre Server

Question 43.
Which version of Windows introduced as a stable version.
a) Windows-XP
b) Windows Me
c) Windows-Vista
d) Windows-NT
Answer:
a) Windows-XP

Question 44.
In which version of Windows booting time was improved.
a) Windows-7
b) Windows Me
c) Windows-Vista
d) Windows-NT
Answer:
a) Windows-7

Question 45.
__________feature is introduced in Windows-7.
a) Aero peek
b) Pinning programms to the taskbar
c) Handwriting recognition
d) All the above
Answer:
d) All the above

Question 46.
What is used to interact with windows by clicking icons?
(a) Mouse
(b) Keyboard
(c) Monitor
(d) Printer
Answer:
(a) Mouse

Question 47.
Which version of Windows served as a common platform for mobile and computer.
a) Windows-7
b) Windows – 8
c) Windows-Vista
d) Windows-NT
Answer:
b) Windows – 8

Question 48.
Windows-8 takes better advantage of_________
a) multi-core processing
b) solid-state drives
c) touch screens
d) all the above
Answer:
d) all the above

Question 49.
The start button was added again in the version of Windows.
a) Windows-7
b) Windows-8
c) Windows-Vista
d) Windows-10
Answer:
d) Windows-10

Question 50.
Hardware settings are used in which option?
(a) Monitor
(b) Display
(c) Theme
(d) My Computer
Answer:
(b) Display

Question 51.
Cortana voice activated personal assistance introduced in _________version of Windows.
a) Windows-7
b) Windows-8
c) Windows-Vista
d) Windows-10
Answer:
d) Windows-10

Question 52.
The opening screen of Windows is called
a) taskbar
b) system tray
c) desktop
d) none of the above
Answer:
c) desktop

Question 53.
The notification area of ubuntu-desktop is otherwise called……………….
(a) Task bar
(b) Desktop
(c) status bar
(d) Indicator area
Answer:
(d) Indicator area

Question 54.
_________is a graphic symbol representing the window elements like files, folders, shortcuts etc.
a) Taskbar
b) Icon
c) Shortcut key
d) None of these
Answer:
b) Icon

Question 55.
_________play a vital role in GUI based applications.
a) Taskbar
b) Icon
c) Shortcut key
d) None of these
Answer:
b) Icon

Question 56.
The icons which are available on the desktop by default while installing Windows OS are called __________icons.
a) quick launch
b) standard
c) default
d) desktop
Answer:
b) standard

Question 57.
Which menu has the rename option?
(a) File
(b) Edit
(c) View
(d) Window
Answer:
(a) File

Question 58.
_________icons can be created for any application or file or folder.
a) Standard
b) Default
c) Shortcut
d) None of these
Answer:
c) Shortcut

Question 59.
By double-clicking the _________icon, the related application or file or folder will open.
a) Standard
b) Default
c) Shortcut
d) None of these
Answer:
c) Shortcut

Question 60.
The disk drive icons graphically represent _________disk drive options.
a) six
b) five
c) three
d) four
Answer:
b) five

Question 61.
Which option reboot the computer?
(a) Restart
(b) Boot
(c) Reboot
(d) Reselect
Answer:
(a) Restart

Question 62.
The disk drive icons available for __________
a) Removable storage
b) Network drive
c) Pen drive
d) All the above
Answer:
d) All the above

Question 63.
__________is a typical rectangular area in an application or a document.
a) Cell pointer
b) Window
c) Table cell
d) None of these
Answer:
b) Window

Question 64.
_________ is an area on the screen that displays information for a specific program.
a) Cell pointer
b) Window
c) Table cell
d) None of these
Answer:
b) Window

Question 65.
Who developed Ubuntu OS?
(a) Mark Shuttleworth
(b) Ricki Mascitti
(c) Dan Bricklin
(d) Bob Frankston
Answer:
(a) Mark Shuttleworth

Question 66.
Application window can be __________
a) resized
b) maximized or minimized
c) placed side by side or overlap
d) All the above
Answer:
d) All the above

Question 67.
When two or more windows are open, only one of them is active and the rest are__________
a) inactive
b) hidden
c) minimized
d) maximized
Answer:
a) inactive

Question 68.
A __________is a section of the screen used to display the contents of a document.
a) System Window
b) Application Box
c) Application Window
d) Document Window
Answer:
d) Document Window

Question 69.
How many sets of scroll bars are there?
(a) 2
(b) 3
(c) 4
(d) 5
Answer:
(a) 2

Question 70.
__________ window is used for typing, editing, drawing, and formatting the text and graphics.
a) System Window
b) Application Box
c) Application Window
d) Document Window
Answer:
d) Document Window

Question 71.
__________window helps the user to communicate with the Application program.
a) System Window
b) Application Box
c) Application Window
d) Document Window
Answer:
c) Application Window

Question 72.
The title bar of a window will contain __________button.
a) minimize
b) maximize
c) close
d) all the above
Answer:
d) all the above

Question 73.
What is the name given to the larger window?
(a) Work window
(b) Document window
(c) Application window
(d) Desktop
Answer:
(c) Application window

Question 74.
__________in the menu bar can be accessed by pressing the Alt key and the letter that appears underlined in the menu title.
a) Menu
b) Title
c) Tool
d) None of these
Answer:
a) Menu

Question 75.
In Windows 7, in the absence of the menu bar, click __________and from the drop-down menu, click the Layout option and select the desired item from that list.
a) System Properties
b) Install
c) Uninstall
d) Organize
Answer:
d) Organize

Question 76.
The __________is the area in the document window to enter or type the text of your document.
a) application space
b) text space
c) content space
d) workspace
Answer:
d) workspace

Question 77.
The scroll bars are used to scroll the workspace __________
a) horizontally
b) vertically
c) either A or B
d) None of these
Answer:
c) either A or B

Question 78.
Which option is used as a part of installing new software or windows update?
(a) Lock
(b) Restart
(c) Sleep
(d) Hibernate
Answer:
(b) Restart

Question 79.
Using the __________menu, we can start any application.
a) Start
b) File
c) Format
d) Tools
Answer:
a) Start

Question 80.
At the bottom of the screen is a horizontal bar called the __________
a) scrollbar
b) taskbar
c) quick launch toolbar
d) system tray
Answer:
b) taskbar

Question 81.
Task bar contains __________
a) Start button
b) shortcuts to various programs
c) minimized programs
d) all the above
Answer:
d) all the above

Question 82.
In the taskbar, the extreme right corner we can see the __________.
a) Start button
b) shortcuts to various programs
c) minimized programs
d) system tray
Answer:
d) system tray

Question 83.
System trays contains __________
a) volume control
b) network
c) date and time
d) all the above
Answer:
d) all the above

Question 84.
In the taskbar, __________contains task for frequently used applications.
a) scroll bar
b) start button
c) quick launch toolbar
d) system tray
Answer:
c) quick launch toolbar

Question 85.
By clicking the __________icon, the user can see the disk drivers mounted in the system in windows-XP and Windows Vista.
a) This PC
b) My Document
c) Computer
d) My Computer
Answer:
c) Computer

Question 86.
By clicking the __________icon, the user can see the disk drivers mounted in the system in Windows-8.
a) This PC
b) My Document
c) Computer
d) My Computer
Answer:
d) My Computer

Question 87.
The functionality of computer icon _________in all versions of Windows.
a) differs
b) remains the same
c) slightly change
d) None of these
Answer:
b) remains the same

Question 88.
By clicking the _________ icon, the user can see the disk drivers mounted in the system in Windows-7.
a) This PC
b) My Document
c) Computer
d) My Computer
Answer:
c) Computer

Question 89.
We can also open an application by clicking __________on the Start menu, and the name of the application.
a) Run
b) All Programs
c) Accessories
d) None of these
Answer:
a) Run

Question 90.
To quit an application, click the __________ button in the upper right corner of the application window.
a) Minimize
b) Maximize
c) Resize
d) Close
Answer:
d) Close

Question 91.
We can also quit an application by clicking on the option in Windows 7.
a) File → Exit
b) File → Close
c) Both A and B
d) None of these
Answer:
c) Both A and B

Question 92.
In Windows-7, we can organize your documents and programs in the form of_________
a) files
b) folder
c) Both A and B
d) None of these
Answer:
c) Both A and B

Question 93.
We can_________ the files and folders.
a) move and copy
b) rename and delete
c) search
d) all the above
Answer:
d) all the above

Question 94.
To better organise our files, we can store them in __________
a) shortcut
b) folder
c) recycle bin
d) None of these
Answer:
b) folder

Question 95.
There are __________ways in to create a new folder.
a) 5
b) 4
c) 3
d) 2
Answer:
d) 2

Question 96.
__________is a command to create a new folder.
a) File → New → Directory
b) File → New → Folder
c) File → Open → Folder
d) File → New → New Folder
Answer:
b) File → New → Folder

Question 97.
The default name of the new folder is__________
a) New folder
b) Untitled
c) Noname
d) None of these
Answer:
a) New folder

Question 98.
To create a folder in the desktop __________command is used.
a) left-click →  New → Folder
b) right-click → New → Directory
c) double click → New → Folder
d) right-click → New → Folder
Answer:
d) right-click → New → Folder

Question 99.
_________ is an in-built word processor application in Windows OS.
a) Word
b) Wordstar
c) Wordpad
d) Notepad
Answer:
c) Wordpad

Question 100.
In Windows OS to create and manipulate text documents __________is used by default.
a) Word
b) Wordstar
c) Wordpad
d) Notepad
Answer:
c) Wordpad

Question 101.
__________is used to open Wordpad.
a) Click Start → All Programs → Accessories → Wordpad.
b) Run → type Wordpad, click OK
c) Either A or B
d) None of these
Answer:
c) Either A or B

Question 102.
In Wordpad, save the file using __________
a) File → Save
b) Ctrl + S
c) Either A or B
d) None of these
Answer:
c) Either A or B

Question 103.
In the Save As dialog box, select the location where you want to save the file by using the _______drop down list box.
a) filename
b) look in
c) file type
d) None of these
Answer:
b) look in

Question 104.
We can use the _______ box on the Start menu to quickly search a particular folder or file in the computer or in a specific drive.
a) Find
b) Search
c) Look in
d) None of these
Answer:
b) Search

Question 105.
The most common way of opening a file or a Folder is to _______on it.
a) right-click
b) double click
c) click and drag
d) move the mouse
Answer:
b) double click

Question 106.
How many methods are there to rename a file?
a) 4
b) 3
c) 2
d) only one
Answer:
b) 3

Question 107.
_______is the command for cut operation.
a) Edit → Cut
b) File → Cut
c) Format → Cut
d) Window → Cut
Answer:
a) Edit → Cut

Question 108.
_______is the shortcut for cut operation.
a) Ctrl + C
b) Ctrl + X
c) Ctrl + P
d) Ctrl + V
Answer:
b) Ctrl + X

Question 109.
_______is the command for copy operation.
a) Edit → Copy
b) File → Copy
c) Format → Copy
d) Window → Copy
Answer:
a) Edit → Copy

Question 110.
_______is the shortcut for copy operation.
a) Ctrl + C
b) Ctrl + X
c) Ctrl + P
d) Ctrl + V
Answer:
a) Ctrl + C

Question 111.
_______is the command for paste operation.
a) Edit → Paste
b) File → Paste
c) Format → Paste
d) Window → Paste
Answer:
a) Edit → Paste

Question 112.
_______is the shortcut for paste operation.
a) Ctrl + C
b) Ctrl + X
c) Ctrl + P
d) Ctrl + V
Answer:
d) Ctrl + V

Question 113.
_______is used for copy operation.
a) Click Edit Copy
b) Press Ctrl + C
c) Right click → Copy from the pop-up menu
d) all the above
Answer:
d) all the above

Question 114.
_______is used for cut operation.
a) Click Edit → Cut
b) Press Ctrl + X
c) Right click Cut from the pop-up menu
d) all the above
Answer:
d) all the above

Question 115.
_______is used for paste operation.
a) Click Edit → Paste
b) Press Ctrl + V
c) Right click → Paste from the pop-up menu
d) all the above
Answer:
d) all the above

Question 116.
There are _______methods of transferring files to or from a removable disk.
a) 2
b) 3
c) only one
d) None of these
Answer:
a) 2

Question 117.
_______is a method of transferring files to or from a removable disk.
a) Copy and Paste
b) Send To
c) Both A and B
d) None of these
Answer:
c) Both A and B

Question 118.
If you want to select multiple files or folders, use _______
a) Ctrl + Click
b) Shift + Click
c) Alt + Click
d) All the above
Answer:
a) Ctrl + Click

Question 119.
If you want to select consecutive files or folders, click on the first file and then use_______at the last file.
a) Ctrl + Click
b) Shift + Click
c) Alt + Click
d) All the above
Answer:
b) Shift + Click

Question 120.
When we delete a file or folder, it will move into the _______
a) My Document
b) My Computer
c) Recycle Bin
d) None of these
Answer:
c) Recycle Bin

Question 121.
To permanently delete a file or folder (i.e. to avoid sending a file or folder to the Recycle Bin), hold down the _______key, and press deletes on the keyboard.
a) ALT
b) SHIFT
c) CTRL
d) None of these
Answer:
b) SHIFT

Question 122.
_______is a special folder to keep the files or folders deleted by the user.
a) My Document
b) My Computer
c) Recycle Bin
d) None of these
Answer:
c) Recycle Bin

Question 123.
The user cannot access the files or folders available in the Recycle bin without _______it.
a) deleting
b) copy
c) restoring
d) None of these
Answer:
c) restoring

Question 124.
To delete all files in the Recycle bin, select _______option.
a) Empty the Recycle Bin
b) Clear the Recycle bin
c) Trash
d) None of these
Answer:
a) Empty the Recycle Bin

Question 125.
_______option is used to switch to another user account on the computer without closing our open programs and Windows processes.
a) log-off
b) switch user
c) sleep
d) restart
Answer:
b) switch user

Question 126.
_________ option is used to switch to another user account on the computer after closing all your open programs and Windows processes.
a) log-off
b) switch user
c) sleep
d) restart
Answer:
a) log-off

Question 127.
_______ option is used to reboot the computer.
a) log-off
b) switch user
c) sleep
d) restart
Answer:
d) restart

Question 128.
_______option is often required as part of installing new software or Windows update.
a) log-off
b) switch user
c) sleep
d) restart
Answer:
d) restart

Question 129.
_______option puts the computer into a low-power mode that retains all running programs and open Windows in computer memory for a super-quick restart.
a) log-off
b) switch user
c) sleep
d) restart
Answer:
c) sleep

Question 130.
_______option found only on laptop computers.
a) hibernate
b) shutdown
c) sleep
d) restart
Answer:
a) hibernate

Part II

Choose the correct answer:

Question 1.
_______refers to a program or software in which the source code is available on the web to the general public free of cost.
a) malware
b) free source
c) open-source
d) None of these
Answer:
c) open-source

Question 2.
_______is typically created as a collaborative effort in which programmers continuously improve upon the source code on the web and share the changes within the community.
a) malware
b) free source code
c) open-source code
d) None of these
Answer:
c) open-source code

Question 3.
_______is one of the popular Open Source versions of the UNIX Operating System.
a) Linux
b) MSDOS
c) Oracle
d) None of these
Answer:
a) Linux

Question 4.
_______is open source as its source code is freely available.
a) Linux
b) MSDOS
c) Oracle
d) None of these
Answer:
a) Linux

Question 5.
The most popular Linux server distributor is_______
a) Ubuntu Linux
b) Linux Mint
c) Arch Linux
d) All the above
Answer:
d) All the above

Question 6.
The most popular Linux server distributor is_______
a) Deepin and Fedora
b) Debian
c) CentOS
d) All the above
Answer:
d) All the above

Question 7.
_______ is a Linux-based operating system.
a) Ubuntu
b) MSDOS
c) Oracle
d) None of these
Answer:
a) Ubuntu

Question 8.
_______ is designed for computers, smartphones, and network servers.
a) Ubuntu
b) MSDOS
c) Oracle
d) None of these
Answer:
a) Ubuntu

Question 9.
The Ubuntu system is developed by a UK based company called ._______
a) Microsoft
b) Borland International
c) Cambridge
d) Canonical Ltd
Answer:
d) Canonical Ltd

Question 10.
Ubuntu was conceived in the year _______
a) 1994
b) 2004
c) 2014
d) 2012
Answer:
b) 2004

Question 11.
Ubuntu was conceived by_______
a) Mark Shuttleworth
b) Mark Zuckerberg
c) Mark Shuttleberg
d) None of these
Answer:
a) Mark Shuttleworth

Question 12.
The desktop version of Ubuntu supports _______ software.
a) Firefox
b) Chrome
c) VLC
d) All the above
Answer:
d) All the above

Question 13.
Ubundu supports the office suite called_______
a) MS-Office
b) Star Office
c) Libre Office
d) None of these
Answer:
c) Libre Office

Question 14.
Ubuntu has in-built email software called_______
a) Firefox
b) Thunderfox
c) Firebird
d) Thunderbird
Answer:
d) Thunderbird

Question 15.
_______ gives the user access to email such as Exchange, Gmail, Hotmail, etc.
a) Firefox
b) Thunderfox
c) Firebird
d) Thunderbird
Answer:
d) Thunderbird

Question 16.
The best feature of Ubundu is _______
a) It is a free operating system
b) It is backed by a huge open source community
c) Both A and B
d) None of these
Answer:
c) Both A and B

Question 17.
_______ is based on the concept of a Graphical User Interface.
a) Ubundu
b) Microsoft Windows
c) Apple
d) All the above
Answer:
d) All the above

Question 18.
_______ is the icons in the Ubuntu OS.
a) Search your Computer
b) Files
c) Firefox Web browser
d) All the above
Answer:
d) All the above

Question 19.
_______ is a word processor software of Ubundu.
a) LibreOffice Writer
b) LibreOfficeCalc
c) LibreOffice Impress
d) None of these
Answer:
a) LibreOffice Writer

Question 20.
_______ is a spreadsheet software of Ubundu.
a) LibreOffice Writer
b) LibreOfficeCalc
c) LibreOffice Impress
d) None of these
Answer:
b) LibreOfficeCalc

Question 21.
_______ is a Presentation software of Ubundu.
a) LibreOffice Writer
b) LibreOfficeCalc
c) LibreOffice Impress
d) None of these
Answer:
c) LibreOffice Impress

Question 22.
_______ is the online shopping icon of Ubundu.
a) Amazon
b) Firefox
c) Bigshop
d) Wallmart
Answer:
a) Amazon

Question 23.
_______ is a Recycle Bin Icon of Ubundu.
a) Amazon
b) Firefox
c) Files
d) Trash
Answer:
d) Trash

Question 24.
In Unundu, the frequently used icons in the menu bar are found on the _______
a) left
b) middle
c) right
d) Either A or B or C
Answer:
c) right

Question 25.
The most common indicators in the Menu bar are located in the _______ .
a) Indicator
b) Notification area
c) Either A or B
d) None of these
Answer:
c) Either A or B

Question 26.
_______ manages network connections, allowing you to connect to a wired or wireless network.
a) Indicator
b) Notification area
c) Either A or B
d) Network Indicator
Answer:
d) Network Indicator

Question 27.
_______ shows the current keyboard layout.
a) Indicator
b) Notification area
c) Text Entry Settings
d) Network Indicator
Answer:
c) Text Entry Settings

Question 28.
The keyboard indicator menu contains the_______ menu items.
a) Character Map
b) Keyboard Layout Chart
c) Text Entry Settings
d) All the above
Answer:
d) All the above

Question 29.
_______ indicator incorporates your social applications.
a) Messaging
b) Sound
c) Session
d) Network
Answer:
a) Messaging

Question 30.
From Messaging indicator, we can access _______
a) instant messenger
b) email clients
c) Both A and B
d) None of these
Answer:
c) Both A and B

Question 31.
_______ indicator provides an easy way to adjust the volume as well as access your music player.
a) Messaging
b) Sound
c) Session
d) Network
Answer:
b) Sound

Question 32.
_______ indicator is a link to the system settings, Ubuntu Help, and session options
a) Messaging
b) Sound
c) Session
d) Network
Answer:
c) Session

Question 33.
_______ displays the current time and provides a link to your calendar and time and date settings.
a) Indicator
b) Clock
c) System Tray
d) Notification Area
Answer:
b) Clock

Question 34.
_______ is a session option.
a) locking your computer and user/guest session
b) logging out of a session
c) restarting the computer or shutting down completely
d) all the above
Answer:
d) all the above

Question 35.
The _______ shows the name of the currently selected directory.
a) Title bar
b) System Tray
c) Notification Area
d) None of these
Answer:
a) Title bar

Question 36.
The toolbar displays _______
a) your directory browsing history
b) your location in the file system
c) a search button and options for your current directory view
d) all the above
Answer:
d) all the above

Question 37.
The default Ubuntu 16.04 theme known as_______
a) Ambiance
b) Aspirant
c) Environment
d) None of these
Answer:
a) Ambiance

Question 38.
The Launcher is equivalent to _______
a) System Tray
b) Taskbar
c) Desktop
d) None of these
Answer:
b) Taskbar

Question 39.
The vertical bar of icons on the left side of the desktop is called _______
a) System Tray
b) Taskbar
c) Launcher
d) None of these
Answer:
c) Launcher

Question 40.
The Launcher provides easy access to _______
a) applications
b) mounted devices
c) Trash
d) All the above
Answer:
d) All the above

Question 41.
All current applications on your system will place an icon in the _______
a) System Tray
b) Taskbar
c) Launcher
d) None of these
Answer:
c) Launcher

Question 42.
_______ icon is equal to the search button in Windows OS.
a) Search Your Computer
b) Find
c) Quick Search
d) None of these
Answer:
a) Search Your Computer

Question 43.
_______ icon is equivalent to My Computer icon.
a) Your Computer
b) Files
c) Quick Search
d) None of these
Answer:
b) Files

Question 44.
We can directly go to Desktop, Documents using_______ icon.
a) Your Computer
b) Files
c) Quick Search
d) None of these
Answer:
b) Files

Question 45.
By clicking the _______ icon, we can directly browse the internet.
a) Amazon
b) Firefox Web Browser
c) Bishop
d) Walmart
Answer:
b) Firefox Web Browser

Question 46.
_______ is equivalent to clicking the Web Browser in Taskbar in Windows.
a) Amazon
b) Firefox Web Browser
c) Bigshop
d) Walmart
Answer:
b) Firefox Web Browser

Question 47.
_______ icon will directly take you to document preparation applications like MS Word in Windows.
a) LibreOffice Writer
b) LibreOfficeCalc
c) LibreOffice Impress
d) None of these
Answer:
a) LibreOffice Writer

Question 48.
_______ icon will open LibreOffice Calc application.
a) LibreOffice Writer
b) Libre Office Caic
c) LibreOffice Impress
d) None of these
Answer:
b) Libre Office Caic

Question 49.
_______ is similar to MS Excel in Windows.
a) LibreOffice Writer
b) Libre Office Caic
c) LibreOffice Impress
d) None of these
Answer:
b) Libre Office Caic

Question 50.
_______ icon is used to prepare any presentations in Ubuntu like MS PowerPoint.
a) LibreOffice Writer
b) LibreOfficeCaic
c) LibreOffice Impress
d) None of these
Answer:
c) LibreOffice Impress

Question 51.
_______ icon will let you add any additional applications you want.
a) LibreOffice Writer
b) LibreOfficeCalc
c) LibreOffice Impress
d) Ubundu Software
Answer:
d) Ubundu Software

Question 52.
Using _______ icon users can buy and sell any products online.
a) Amazon
b) Firefox Web Browser
c) Online Shopping
d) Wallnnart
Answer:
c) Online Shopping

Question 53.
_______ icon is similar to the Control panel in the Windows Operating System.
a) System Settings
b) Your Computer
c) Launcher
d) None of these
Answer:
a) System Settings

Question 54.
Match the following:
table
a) Trash 1. Online Shopping App
b) System Settings 2. Recycle Bin
c) LibreOffice Impress 3. Control Panel
d) Amazon 4. Presentation software
a) 2, 1, 4, 3
b) 4, 3, 1, 2
c) 3, 1, 4, 2
d) 2, 3, 4, 1
Answer:
d) 2, 3, 4, 1

Question 55.
Identify the correct statement from the following:
a) In Ubundu, all the deleted Files and Folders are moved to Trash
b) Similar to Windows OS, we can create, delete the files and folders with the same procedure by clicking the Files icon in Ubundu.
c) A new File or new Folder can also be created by using File menu in Ubundu
d) All the above
Answer:
d) All the above

Question 56.
Shutting down Ubuntu using Session _______ option.
a) Log out
b) Suspend
c) Shutdown
d) All the above
Answer:
d) All the above

Part – I

Shot Answers

Question 1.
Name some distributions of Linux.
Answer:

1. Fedora
2. Ubuntu
3. BOSS
4. RedHat
5. Linux Mint.

Question 2.
What are the most popular operating systems suitable for desktop and laptop computers?
Answer:
All the Windows Series like Windows Vista, Windows-7, etc operating systems are suitable for desktop and laptop computers.

Question 3.
What is Open source Operating system?
Answer:
It is the software in which the source code is available to the general public for use and modification from its original design, free of charge.

Question 4.
Which operating system suitable for Apple phones, iPad, and iPods?
Answer:
iOS operating systems are suitable for Apple phones, iPad, and iPod.

Question 5.
What are the similarities between Ubuntu and other operating systems?
Answer:
All are based on the concepts of Graphical User Interface.

Question 6.
What is multitasking?
Answer:
Multiple applications can execute simultaneously in Windows, and this is known as multitasking.

Question 7.
What is a workspace of a window?
Answer:
The workspace is the area in the document window to enter or type the text of your document. The workspace is the element of a window.

Question 8.
What are the file management activities?
Answer:
File management activities are creating, modifying, saving, deleting files and folders.

Question 9.
What are the four versions of Windows 2000 and its application?
Answer:
The four versions of Windows 2000 are:

• Windows 2000 – Professional – for business desktop and laptop systems.
• Windows 2000 – Server – for both a Web server and an office server.
• Windows 2000 – Advanced Server – for line-of-business applications.
• Windows 2000 – Data Centre Server – for high-traffic computer networks.

Question 10.
What is Firefox?
Answer:
It is a browser.

Question 11.
What is a desktop?
Answer:
The opening screen of Windows is called Desktop.

Question 12.
Write a note on Icons.
Answer:
Icon is a graphic symbol representing the window elements like files, folders, shortcuts etc. Icons play a vital role in GUI based applications.

Question 13.
What do you mean by standard icon? Give an example.
Answer:
The icons which are available on desktop by default while installing Windows OS are called standard icons. The standard icons available in all Windows OS are My Computer, Documents and Recycle Bin.

Question 14.
How will you switch to desktop?
Answer:
We can move to the Desktop any time by pressing the Winkey + D or using Aero Peek while working in any application.

Question 15.
Define Window.
Answer:
Window is a typical rectangular area in an application or a document. It is an area on the screen that displays information for a specific program.

Question 16.
Write note on document window.
Answer:
A document window is a section of the screen used to display the contents of a document.

Question 17.
Write a note on Recycle Bin.
Answer:
Recycle Bin: Recycle bin is a special folder to keep the files or folders deleted by the user, which means you still have an opportunity to recover them. The user cannot access the files or folders available in the Recycle bin without restoring it.

Question 18.
How will you restore file or folder from Recycle Bin?
Answer:
To restore file or folder from the Recycle Bin

• Open Recycle bin.
• Right-click on a file or folder to be restored and select the Restore option from the pop-up menu.
• To restore multiple files or folders, select Restore all items.
• To delete all files in the Recycle bin, select Empty the Recycle Bin.

Question 19.
How will you create a desktop shortcut?
Answer:
Creating Shortcuts on the Desktop:
Shortcuts to your most often used folders and files may be created and placed on the Desktop to help automate your work.

• Select the file or folder that you wish to have as a shortcut on the Desktop.
• Right-click on the file or folder.
• Select Send to from the shortcut menu, then select Desktop (Create Shortcut) from the sub¬menu.
• A shortcut for the file or folder will now appear on your desktop and you can open it from the desktop in the same way as any other icon.

Question 20.
How will you log off/shut down the computer?
Answer:
To Log off/Shut down the computer :

• Click start to → log off (click the arrow next to Shut down) or Start Shutdown.
• If you have any open programs, then you will be asked to close them or windows will Force shut down, you will lose any unsaved information if you do this.

Question 21.
Compare switch user and log off options.
Answer:

• Switch User: Switch to another user account on the computer without closing your open programs and Windows processes.
• Log Off: Switch to another user account on the computer after closing all your open programs and Windows processes.

Question 22.
When we use the Lock and Restart option?
Answer:

• Lock: Lock the computer while you’re away from it.
• Restart: Reboot the computer. This option is often required as part of installing new software or Windows update.

Question 23.
Write a note on the Sleep mode option.
Answer:
Sleep: Puts the computer into a low-power mode that retains all running programs and open Windows in computer memory for a super-quick restart.

Question 24.
Write a note on Hibernate mode option? Where it is available?
Answer:
The Hibernate option is found only on laptop computers. It puts the computer into a low-power mode after saving all running programs and open windows on the machine’s hard drive for a quick restart.

Part – II

Short Answers

Question 1.
How will you rename the files or folders?
Answer:
Using the FILE Menu

1. Select the File or Folder you wish to Rename.
2. Click File → Rename.
3. Type in the new name.
4. To finalize the renaming operation, press Enter

Question 2.
What are the merits of open source code?
Answer:
Open Source code is typically created as a collaborative effort in which programmers continuously improve upon the source code on the web and share the changes within the community.

Question 3.
List out the important functions of an OS?
Answer:
Following are some of the important functions of an Operating System:

1. Memory Management
2. Process Management
3. Device Management
4. File Management
5. Security Management
6. Control overall system performance
7. Error detecting aids
8. Coordination between other software and users

Question 4.
List the distributors of Linux.
Answer:
The most popular Linux server distributors are: Ubuntu Linux

• Linux Mint
• Arch Linux
• Deepin
• Fedora
• Debian
• CentOS

Question 5.
Write about Ubuntu.
Answer:
Ubuntu is a Linux-based operating system. It is designed for computers, smartphones, and network servers. The system is developed by a UK-based company called Canonical Ltd. Ubuntu was conceived in 2004 by Mark Shuttleworth, a successful South African entrepreneur.

Question 6.
Write note on the Network indicator.
Answer:
Network indicator – This manages network connections, allowing you to connect to a wired or wireless network.

Question 7.
What are the four versions of Windows 2000?
Answer:

1. Professional – business desktop and laptop systems.
2. Server – used as both a web server and an office server.
3. Advanced server – for a line of business applications.
4. Datacenter server – for high-traffic computer networks.

Question 8.
Write note on the Sound indicator.
Answer:
Sound indicator – This provides an easy way to adjust the volume as well as access your music player.

Question 9.
What is a Window?
Answer:
Window is a typical rectangular area in an application or a document. It is an area on the screen that displays information for a specific program. The two types of windows are the application window and the document window.

Question 10.
Write about session indicators.
Answer:
Session indicator – This is a link to the system settings, Ubuntu Help, and session options like locking your computer, user/guest session, logging out of a session, restarting the computer, or shutting down completely.

Question 11.
How will you start an application?
Answer:

1. Click the start button and then point to all programs. The program menu appears. Point to the group that contains the application you want to start and then click the application name.
2. Click Run on the start menu and type the name of the application and click ok.

Question 12.
Write about Toolbar of Ubuntu.
Answer:
Toolbar – The toolbar displays your directory browsing history, your location in the file system, a search button, and options for your current directory view.

Question 13.
Write a note on Recycle bin.
Answer:
Recycle bin is a special folder to keep the files or folders deleted by the user. From the recycle bin, files can be restored back.

Part – I

Explain brief

Question 1.
Discuss the following Icons.
Answer:
Shortcut Icons:
Shortcut icons can be created for any application or file or folder. By double-clicking the icon, the related application or file, or folder will open. This represents the shortcut to open a particular application.

Disk drive icons:
The disk drive icons graphically represent five disk drive options.

1. Hard disk.
2. CD – ROM/DVD Drive.
3. Pen drive.
4. Other removable storage such as mobile, smartphone, tablet, etc.
5. Network drives if your system is connected with another system.

Question 2.
What is a shortcut icon? Mention its types.
Answer:
Shortcut icons can be created for any application or file or folder. By double-clicking the icon, the related application or file, or folder will open.
Type of shortcuts:

1. Desktop shortcut
2. Keyboard shortcut

Question 3.
Write notes on disk drive icons.
Answer:
The disk drive icons graphically represent five disk drive options.

1. Hard disk.
2. CD-ROM/DVD Drive
3. Pen drive
4. Other removable storage such as mobile, smartphone, tablet, etc.
5. Network drives if your system is connected with another system.

Question 4.
What is the application window? Explain with an example.
Answer:
It is an area on a computer screen with defined boundaries, and within which information is displayed.
Such windows can be resized, maximized, minimized, placed side by side, overlap, and so on.
An Application Window contains an open application i.e. current application such as Word or Paint. When two or more windows are open, only one of them is active and the rest are inactive.

Question 5.
Explain various methods of creating Files and Folders.
Answer:
Creating files and Folders:
Creating Folders:
You can store your files in many locations – on the hard disk or in other devices. To better organise your files, you can store them in folders.
There are two ways in which you can create a new folder:

Method I:
Step 1: Open Computer Icon.
Step 2: Open any drive where you want to create a new folder. (For example select D:)
Step 3: Click on File → New → Folder.
Step 4: A new folder is created with the default name “New folder”.
Step 5: Type in the folder name and press Enter key.

Method II:
In order to create a folder in the desktop:
Step 1: In the Desktop, right-click → New → Folder.
Step 2: A Folder appears with the default name “New folder” and it will be highlighted.
Step 3: Type the name you want and press Enter Key.
Step 4: The name of the folder will change.

Question 6.
Write about Taskbar.
Answer:
At the bottom of the screen there- is a horizontal bar called the taskbar. This bar contains the Start button(left side), shortcuts to various programs, minimized programs, and in the extreme right corner you can see the system tray which consists of volume control, network, date and time, etc. Next to the Start button is the quick Launch Toolbar which contains tasks for frequently used applications.

Question 7.
Explain Computer Icon.
Answer:
Computer Icon – By clicking this icon, the user can see the disk drivers mounted in the system. In Windows XP, Vista, this icon is called “My computer” in Windows 8 and 10, it is called “This PC”.
The functionality of the computer icon remains the same in all versions of windows as shown in the following Figure.

Question 8.
How will you copy files and folders?
Answer:
Copying Files and Folders:
There are variety of ways to copy files and folders:

The method I – COPY and PASTE:
To copy a file or folder, first, select the file or folder and then choose one of the following:

1. Click Edit → Copy or Ctrl + C or right-click → Copy from the pop-up menu.
2. To paste the file(s) or folder(s) in the new location, navigate to the target location then do one of the following:
3. Click Edit → Paste or Ctrl + V.
4. Or Right-click → Paste from the pop-up menu.

Method II – Drag and Drop:

1. In the RIGHT pane, select the file or folder you want to copy.
2. Click and drag the selected file and/or folder to the folder list on the left, and drop it where you want to copy the file and/or folder.
3. Your file(s) and folder(s) will now appear in the new area.

Question 9.
How will you search files or folders using the Computer icon?
Answer:
Procedure:

• Click Computer Icon from desktop or from the Start menu.
• The Computer disk drive screen will appear and at the top right corner of that screen, there is a search box option.
• Type the name of the file or the folder you want to search. Even if you give the part of the file or folder name, it will display the list of files or folders starting with the specified name.
• Just click and open that file or the folder.

Question 10.
How will you delete a file or folder?
Answer:
To delete a file or folder: Select the file or folder you wish to delete.

• Right-click the file or folder, select the Delete option from the pop-up menu or Click File → Delete or press the Delete key from the keyboard.
• The file will be deleted and moved to the Recycle bin.

Question 11.
Represent overview of an operating system using a diagram.
Answer:

Part II

Explain brief

Question 1.
What are the features of Ubuntu?
Answer:
Features of Ubuntu

• The desktop version of Ubuntu supports all norma! software like Windows such as Firefox, Chrome, VLC, etc.
• It supports the office suite called LibreOffice.
• Ubuntu has in-built email software called Thunderbird, which gives the user access to email such as Exchange, Gmail, Hotmail, etc.
• There are free applications for users to view and edit photos, to manage and share videos.
• It is easy to find content on Ubuntu with the smart searching facility.
• The best feature is, it is a free operating system and is backed by a huge open source community.

Question 2.
What are the names of the icons in the Ubuntu OS?
Answer:

• Search your Computer
• Files
• Firefox Webbrowser
• LibreOffice Writer
• LibreOfficeCalc
• LibreOffice Impress
• Ubuntu Software
• Amazon
• System Settings
• Trash

Question 3.
Explain about Ubuntu menu bar.
Answer:
Menu bar – The menu bar is located at the top of the screen, The menu bar Incorporates common functions used in Ubuntu. The frequently used icons in the menu bar are found on the right. The most common indicators in the Menu bar are located in the indicator or notification area.

Question 4.
Write a note on Text entry settings.
Answer:
Text entry settings: This shows the current keyboard layout (such as En, Fr, Ku, and so on. If more than one keyboard layout is shown, it allows you to select a keyboard layout out of those choices. The keyboard indicator menu contains the following menu items: Character Map, Keyboard Layout Chart, and Text Entry Settings.

Question 5.
Write about Ubundu desktop background.
Answer:
The desktop background Below the menu bar at the top of the screen is an image covering the entire desktop. This is the default desktop background or wallpaper;, belonging to the default Ubuntu 16.04 theme known as Ambiance.

Question 6.
Explain Ubuntu Shutting down method.
Answer:
Shutting down Ubuntu using Session options
When you have finished working on your computer, you can choose to Log Out, Suspend or Shut down through the Session Indicator on the far right side of the top panel.

Part – I

Explain brief

Question 1.
Explain the various mouse actions.
Answer:
The following are the mouse actions:

Question 2.
Draw and explain the Elements of a window.
Answer:
The elements of a window

Menu Bar:
The menu bar is seen under the title bar. Menus in the menu bar can be accessed by pressing the Alt key and the letter that appears underlined in the menu title. Additionally, pressing Alt or F10 brings the focus on the first menu of the menu bar.

The Workspace:
The workspace is the area in the document window to enter or type the text of your document.

Scroll bars:
The scroll bars are used to scroll the workspace horizontally or vertically.

Corners and borders:
The corners and borders of the window help to drag and resize the windows. The mouse pointer changes to a double-headed arrow when positioned over a border or a corner. Drag the border or corner in the direction indicated by the double-headed arrow to the desired size. The window can be resized by dragging the corners diagonally across the screen.

Title bar:
The first line of the window is called the title bar. It contains the name of the application on its left and the sizing buttons on its right.

Question 3.
How will you create a folder? Explain its methods with an example.
Answer:
There are two ways in which you can create a new folder:

Method I:
Step 1: Open Computer Icon.
Step 2: Open any drive where you want to create a new folder. (For example select D:.
Step 3: Click on File → New Folder.
Step 4: A new folder is created with the default name “New folder”.
Step 5: Type in the folder name and press Enter key.

Method II:
In order to create a folder on the desktop:
Step 1: In the Desktop, right-click New → Folder.
Step 2: A Folder appears with the default name “New folder” and it will be highlighted.
Step 3: Type the name you want and press Enter Key.
Step 4: The name of the folder will change.

Question 4.
How will you create a file in Wordpad?
Answer:
To create files in Wordpad we need to follow the steps given below.

1. Click Start → All Programs → Accessories → Wordpad or Run → type Wordpad, click OK. Wordpad window will be opened.
2. Type the contents in the workspace and save the file using File → Save or Ctrl + S.
3. Save As dialog box will be opened.
4. In the dialog box, select the location where you want to save the file by using the Look in the drop-down list box.
5. Type the name of the file in the file name text box.
6. Click the save button.

Question 5.
Explain the method of finding Files and Folders.
Answer:
You can use the search box on the Start menu to quickly search a particular folder or file in the computer or in a specific drive.

To find a file or folder

1. Click the Start button, the search box appears at the bottom of the start menu.
2. Type the name of the file or the folder you want to search. Even if you give the part of the file or folder name, it will display the list of files or folders starting with the specified name.
3. The files or the folders with the specified names will appear, if you click that file, it will directly open that file or the folder.
4. There is another option called “See more results” which appears above the search box.
5. If you click it, it will lead you to a Search Results dialog box where you can click and open that file or the folder.

Question 6.
Explain the various methods to Rename a file.
Answer:
You can rename using the File menu, left mouse button, or right mouse button.

Method 1:
Using the FILE Menu

1. Select the File or Folder you wish to Rename.
2. Click File → Rename.
3. Type in the new name.
4. To finalise the renaming operation, press Enter.

Method 2:
Using the Right Mouse Button

1. Select the file or folder you wish to rename.
2. Click the right mouse button over the file or folder.
3. Select Rename from the pop-up menu.
4. Type in the new name.
5. To finalise the renaming operation, press Enter.

Method 3:
Using the Left Mouse Button

1. Select the file or folder you wish to rename.
2. Press F2 or click over the file or folder. A surrounding rectangle will appear around the name.
3. Type in the new name.
4. To finalise the renaming operation, press Enter.

Question 7.
How will you move the files and folders? Explain various methods.
Answer:
Method I:
CUT and PASTE: To move a file or folder, first select the file or folder and then choose one of the following:

1. Click on the Edit → Cut or Ctrl + X Or right-click → cut from the pop-up menu.
2. To move the file(s) or folder(s) in the new location, navigate to the new location and paste it using Click Edit → Paste from the edit menu or Ctrl + V using the keyboard.
3. Or Right-click →  Paste from the pop-up menu. The file will be pasted in the new location.

Method II:
Drag and Drop: In the disk drive window, we have two panes called left and right panes. In the left pane, the files or folders are displayed like a tree structure. In the right pane, the files inside the specific folders in the left pane are displayed with various options.

1. In the right pane of the Disk drive window, select the file or folder we want to move.
2. Click and drag the selected file or folder from the right pane to the folder list on the left pane.
3. Release the mouse button when the target folder is highlighted (active).
4. Our file or folder will now appear in the new area.

Question 8.
How will you copy the files and folders? Explain various methods.
Answer:
Copying Files and Folders Method I – COPY and PASTE
To copy a file or folder, first, select the file or folder and then choose one of the following:

1. Click Edit Copy or Ctrl + C or right-click Copy from the pop-up menu.
2. To paste the file(s) or folder(s) in the new location, navigate to the target location then do one of the following:
3. Click Edit Paste or Ctrl + V.
4. Or Right-click → Paste from the pop-up menu.

Method II – Drag and Drop

1. In the RIGHT pane, select the file or folder we want to copy.
2. Click and drag the selected file and/or folder to the folder list on the left, and drop it where you want to copy the file and/or folder.
3. Our file(s) and folder(s) will now appear in the new area.

Question 9.
How will you copy the files and folders to a removable disk? Explain various methods.
Answer:
Copying Files and Folders to a removable disk
The following are methods of transferring files to or from a removable disk:

• Copy and Paste
• Send To

METHOD I: Copy and Paste

1. Plug the USB flash drive directly into an available USB port.
2. If the USB flash drive or external drive folder does NOT open automatically, follow these steps:
3. Click Start → Computer.
4. Double-click on the Removable Disk associated with the USB flash drive.
5. Navigate to the folders in your computer containing files you want to transfer.
6. Right-click on the file you want to copy, then select Copy.
7. Return to the Removable Disk window, right-click within the window, then select Paste.

METHOD II: Send To

1. Plug the USB flash drive directly into an available USB port.
2. Navigate to the folders in our computer containing files you want to transfer.
3. Right-click on the file we want to transfer to your removable disk.
4. Click Send To and select the Removable Disk associated with the USB flash drive.

Part – II

Explain detail

Question 1.
Explain the elements of Ubuntu,
Answer:
Search your Computer Icon
This icon is equal to the search button in Windows OS. Here, you have to give the name of the File or Folder for searching them.

Files :
This icon is equivalent to the My Computer icon. From here, you can directly go to Desktop, Documents, and so on.

Firefox Web Browser:
By clicking this icon, you can directly browse the internet. This is equivalent to clicking the Web Browser in Taskbar in Windows.

Online Shopping icon:
Using this icon users can buy and sell any products online.

System Settings Icons :
This icon is similar to the Control panel in the Windows Operating System. But here, you need to authenticate the changes by giving your password. You cannot simply change as you do in Windows.

Trash :
This icon is the equivalent of Recycle bin of windows OS. All the deleted Flies and Folders are
moved here.

Question 2.
Explain the method of creating, deleting files/folders in Ubuntu.
Answer:
Creating, Deleting Files/Folders
Similar to Windows OS, you can create, delete the files and folders with the same procedure by clicking the Files icon. The following Figure shows the method of creating a File or Folder by right-clicking on the Desktop.

A new File or new Folder can also be created by using the File menu.

Deleting a File/Folder: A file/folder created by you can be moved to trash by using right-click or by using the menu.

Question 3.
Explain LibreOffice Writer, LibreOffice Cacl and LibreOffice Impress.
Answer:
LibreOffice Writer
This icon will directly take you to document preparation applications like MS Word in Windows.

Libre Office Cac: This icon will open the LibreOffice Calc application. It is similar to MS Excel in Windows.

LibreOffice Impress: By clicking this icon, you can open LibreOffice Impress to prepare any presentations in Ubuntu like MS PowerPoint.

Tamilnadu State Board New Syllabus Samacheer Kalvi 11th Computer Science Guide Pdf Chapter 10 Flow of Control Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 11th Computer Science Solutions Chapter 10 Flow of Control

11th Computer Science Guide Flow of Control Text Book Questions and Answers

Book Evaluation

Part I

Choose The Correct Answer

Question 1.
What is the alternate name of null statement?
a) No statement
b) Empty statement
c) Void statement
d) Zero statement
Answer:
b) Empty statement

Question 2.
In C++, the group of statements should enclosed within:
a) { }
b) [ ]
c)()
d)<>
Answer:
a) { }

Question 3.
The set of statements that are executed again and again in iteration is called as:
a) condition
b) loop
c) statement
d) body of loop
Answer:
d) body of loop

Question 4.
The multi way branching statement:
a) if
b) if… else
c) switch
d) for
Answer:
c) switch

Question 5.
How many types of iteration statements?
a) 2
b) 3
c) 4
d) 5
Answer:
b) 3

Question 6.
How many times the following loop will execute?
for (int i=0; i<10; i++)
a) 0
b) 10
c) 9
d) 11
Answer:
b) 10

Question 7.
Which of the following is the exit control loop?
a) for
b) while
c) do…while
d) if…else
Answer:
c) do…while

Question 8.
Identify the odd one from the keywords of jump statements:
a) break
b) switch
c) go to
d) continue
Answer:
b) switch

Question 9.
Which of the following is the exit control loop?
a) do-while
b) for
c) while
d) if-else
Answer:
a) do-while

Question 10.
A loop that contains another loop inside its body:
a) Nested loop
b) Inner loop
c) In line loop
d) Nesting of loop
Answer:
a) Nested loop

Part – II

Short Answers

Question 1.
What is a null statement and compound statement?
Answer:
null statement; The “null or empty statement” is a statement containing only a semicolon. It takes the flowing form: ;
// it is a null statement
compound Statement:
In C++, a group of statements enclosed by pair of braces {} is called as a compound statement or a block.
The general format of compound statement is:
{
statement1;
statement2;
statement3;
}

Question 2.
What is a selection statement? Write its types?
Answer:
The selection statement means the statements are executed depends upon a condition. If a condition is true, a true block (a set of statements) is executed, otherwise, a false block is executed. This statement is also called a decision statement or selection statement because it helps in making a decision about which set of statements are to be executed.
Types:

1. Two-way branching
2. Multiway branching

Question 3.
Correct the following code segment:
Answer:
if (x=1)
p= 100;
else
P = 10;
Correct code: (Equal to operator is wrongly given)
if (x==1)
p= 100;
else
p = 10;

Question 4.
What will be the output of the following code:
int year;
cin >> year;
if (year % 100 == 0)
if (year % 400 == 0)
cout << “Leap”;
else
cout << “Not Leap year”;

If the input is given is
(i) 2000
(ii) 2003
(iii) 2010
Answer:
i) 2000 AS INPUT
Output
Leap
ii) 2003AS INPUT
Output
Not Leap year
iii) 2010 AS INPUT
Output
Not Leap year

Question 5.
What is the output of the following code?
for (int i=2; i<=10 ; i+=2)
cout << i;
Answer:
Output
2 4 6 8 10

Question 6.
Write a for loop that displays the number from 21 to 30.
Answer:
# include
using namespace std;
int main()
{
for (int = 21; i < 31; i++)
cout << “value of i:” << i << endl;
return 0;
}
Output:
Value of i: 21
Value of i: 22
Value of i: 23
Value of i: 24
Value of i: 25
Value of i: 26
Value of i: 27
Value of i: 28
Value of i: 29
Value of i: 30

Question 7.
Write a while loop that displays numbers 2,4, 6, 8…….20.
Answer:
While loop to
i = 2;
while(i<=20)
{
cout<< i <<“,”;
i = i+2;
}

Question 8.
Compare an if and a ? : operator.
Answer:
The if statement evaluates a condition, if the condition is true then a true-block is executed, otherwise false-block will be executed! Block may consists of one or more statements. The conditional operator (or Ternary operator) . is an alternative for ‘if else statement’. Here if the condition is true one statement otherwise another statement will be executed.

Part – III

Short Answers

Question 1.
Convert the following if-else to a single conditional statement:
Answer:
if (x >= 10)
a = m + 5;
else
a = m;
a = (x >= 10)? m + 5 : m ;

Question 2.
Rewrite the following code so that it is functional:
Answer:
v = 5;
do;
{
total += v;
cout << total;
while v <=10
CORRECT CODE:
int v = 5;
do
{
total += v;
v++;
} while (v <= 10); cout << total;

Question 3.
Write a C++ program to print the multiplication table of a given number.
Answer:

# include
using namespace std;
int main ()
{

int num;
cout << “Enter Number to find its multiplication table”; cin >> num;
for (int a = 1; a < = 10; a++)
{
cout << num << “*” << a << “=” << num*a << endl;
}
return( );
}

Output

Question 4.
Write the syntax and purpose of switch statement.
Answer:
The syntax of the switch statement is:
switch(expression)
{
case constant 1:
statement(s);
break;
case constant 2:
statement(s);
break;
.
.
.
.
default:
statement(s);
}
Purpose of switch statement:
The switch statement is a multi-way branch statement. It provides an easy way to dispatch execution to different parts of code based on the value of the expression.

Question 5.
Write a short program to print following series: a) 1 4 7 10…… 40
Answer:
PROGRAM
using namespace std;
#inciude
int main()
{
for(int i=1;i<=40;i=i+3)
cout<<i<<” “;
return 0;
}
Output

Part – IV

Explain In Detail

Question 1.
Explain the control statement with a suitable example.
Answer:
Control statements are statements that alter the sequence of flow of instructions.
In a program, statements may be executed sequentially, selectively, or iteratively. Every programming language provides statements to support sequence, selection (branching), and iteration.
Selection statement:

The selection statement means the statement(s) are executed depends upon a condition. If a condition is true, a true block ¡s executed otherwise a false block is executed. This statement is also called a decision statement or selection statement because it helps in making decisions about which set of statements are to be executed.
Iteration statement:

The iteration statement is a set of the statement are repetitively executed depends upon conditions. If a condition evaluates to true, the set of statements (true block) is executed again and again. As soon as the condition becomes false, the repetition stops. This is also known as a looping statement or iteration statement.

Question 2.
What entry control loop? Explain any one of the entry control loops with a suitable example.
Answer:
In an entry-controlled loop, the test- expression is evaluated before entering into a loop, while and for statements are called as entry controlled loop.
Working of while loop:
A while loop is a control flow statement that allows the loop statements to be executed as long as the condition is true. The while loop ¡s an entry-controlled loop because the test-expression is evaluated before the entering into a loop.
The while loop syntax is:
while (Test expression )
{
Body of the loop;
}
Statement-x;
In a while loop, the test expression is evaluated and if the test expression result is true, then the body of the loop is executed and again the control is transferred to the while loop. When the test expression result is false the control is transferred to statement-x.
The control flow and flow chart of the while loop is shown below.

Example:
#include <iostream>
using namespace std;
int main ()
{
int i=1,sum=0;
while(i<=10)
{
sum=sum+i;
i++;
}
cout<<“The sum of 1 to 10 is “<<sum; return 0;
}
Output
The sum of 1 to 10 is 55

Question 3.
Write a program to find the LCM and GCD of two numbers.
Answer:
PROGRAM:
using namespace std;
#include <iostream>
int main()
{
int n1, n2, i, gcd;
cout<<“Enter two integers:”;
cin>>n1>>n2;
for(i=1; i <= n1 && i <= n2; ++i)
{
// Checks if i is factor of both integers
if(n1%i==0 && n2%i==0)
gcd = i;
}
int lcm = n1*n2 /gcd;
cout<<“\nG.C.M.OF”<<nl<<“and”<<n2<<”
is”<<gcd;
cout< < “\nL.C. M. OF “< < n 1 < < ” and ” < < n2< < ” is “<<lcm; return 0;
}
Output

Question 4.
Write programs to find the sum of the following series:

Answer:
PROGRAM
using namespace std;
#include
int main()
{
int i,x,n,f=1,sign=1;
float sum=0,t;
cout<<“\nEnter N value”;
cin>>n;
cout<<“\nEnter x value …”;
cin>>x;
t=x;
for(i=1;i<=n;i++)
{
f = f * i;
sum = sum + sign * t/f;
t = t * x;
sign = -sign;
}
cout<<”SUM OF THE SERIES = “<<sum;
return O;
}


PROGRAM
using namespace std;
#include
int main()
{
int i,x,n;
float sum=0,t;
cout<<“\nEnter N value”;
cin>>n;
cout<<“\nEnter x value …”;
cin>>x;
t=x;
for(i=l;i<=n;i++)
{
sum = sum + t/i;
t = t * x;
}
cout<<“SUM OF THE SERIES = “<<sum;
}
Output

Question 5.
Write a program to find sum of the series s=1 +x +x² + ……..+xⁿ
Answer:
PROGRAM
using namespace std;
#include
int main()
{
int sum=1,x,i,t,n;
cout<<“\nEnter N value”;
cin>>n;
cout<<“\nEnter x value … “;
cin>>x;
t=x;
for(i=l;i<=n;i++)
{
sum = sum + t;
t = t * x;
}
cout<<“SUM = “<<sum;
}
Output

11th Computer Science Guide Flow of Control Additional Questions and Answers

Choose The Correct Answer 1 Mark

Question 1.
The empty statement is otherwise called as ………………..
(a) Control statement
(b) Zero statement
(c) Null statement
(d) Block statement
Answer:
(c) Null statement

Question 2.
The basics of control structure are……………. statement.
a) Selection
b) Iteration
c) Jump
d) All the above
Answer:
d) All the above

Question 3.
Iteration statement is called as ………………..
(a) Null statement
(b) Block statement
(c) Selection statement
(d) Looping statement
Answer:
(d) Looping statement

Question 4.
In a program, the action may be ……………..
a) Variable declarations
b) Expression evaluations
c) Assignment operations
d) All the above
Answer:
d) All the above

Question 5.
……………….. is a multi-path decision-making statement.
(a) if
(b) if-else
(c) else – if
(d) if-else ladder
Answer:
(d) if-else ladder

Question 6.
The ……………. is a statement containing only a semicolon.
a) Null
b) Empty statement
c) Both A and B
d) None of these
Answer:
c) Both A and B

Question 7.
……………….. is more efficient than the if-else statement.
(a) Control statement
(b) Switch statement
(c) Empty statement
(d) Null statement
Answer:
(b) Switch statement

Question 8.
C++ allows a group of statements enclosed by pair of ……………..braces.
a) ()
b) { }
c) [ ]
d) < >
Answer:
b) { }

Question 9.
C++ supports types of iteration statements.
(a) 3
(b) 2
(c) 4
(d) 5
Answer:
(a) 3

Question 10.
……………. statements alter the sequence of flow of instructions.
a) Control
b) Null
c) Compound
d) None of these
Answer:
a) Control

Question 11.
……………….. is used to transfer the control from one place to another place without any condition in a program.
(a) Break statement
(b) Continue statement
(c) goto statement
(d) All the above
Answer:
(c) goto statement

Question 12.
The ……………. statement are the statements, that are executed one after another only once from top to bottom.
a) Sequential
b) Selective
c) Iterative
d) None of these
Answer:
a) Sequential

Question 13.
…………….. statements do not alter the flow of execution.
a) Sequential
b) Selective
c) Iterative
d) None of these
Answer:
a) Sequential

Question 14.
…………….. statements always end with a semicolon (;).
a) Sequential
b) Selective
c) Iterative
d) None of these
Answer:
a) Sequential

Question 15.
The ……………. statement means the statement (s) are executed depends upon a condition.
a) Sequential
b) Selective
c) Iterative
d) None of these
Answer:
b) Selective

Question 16.
If a condition is true, a true block (a set of statements) is executed otherwise a false block is executed is called …………… statement.
a) Decision
b) Selection
c) Either A or B
d) None of these
Answer:
c) Either A or B

Question 17.
The ……………. statement is a set of the statement are repetitively executed depends upon conditions.
a) Sequential
b) Selective
c) Iterative
d) None of these
Answer:
c) Iterative

Question 18.
The condition on which the execution or exit from the loop is called ………………
a) Exit-condition
b) Test-condition
c) Either A or B
d) None of these
Answer:
c) Either A or B

Question 19.
In C++, any non-zero is treated as …………… including negative numbers
a) False
b) True
c) Complement
d) None of these
Answer:
b) True

Question 20.
In C++, zero is treated as …………..
a) False
b) True
c) Complement
d) None of these
Answer:
a) False

Question 21.
Decisions in C++ are made using …………….. statement.
a) if..else
b) switch., case
c) Either A or B
d) None of these
Answer:
c) Either A or B

Question 22.
……………. statement which chooses between two alternatives.
a) if..else
b) switch., case
c) Either A or B
d) None of these
Answer:
a) if..else

Question 23.
………………. creates branches for multiple alternatives sections of code, depending on the value of a single variable.
a) if..else
b) switch., case
c) Either A or B
d) None of these
Answer:
b) switch., case

Question 24.
…………. is a two-way branching statement.
a) if..else
b) switch., case
c) Either A or B
d) None of these
Answer:
a) if..else

Question 25.
……………….. is a multiple branching statement.
a) if..else
b) switch., case
c) Either A or B
d) None of these
Answer:
b) switch., case

Question 26.
An if statement contains another if the statement is called …………….
a) Nested if
b) Compound if
c) Block if
d) Group if
Answer:
a) Nested if

Question 27.
The nested if can have ……………. forms.
a) four
b) two
c) three
d) five
Answer:
c) three

Question 28.
……………. is nested if form.
a) If nested inside if part
b) If nested inside both if part and else part
c) If nested inside else part
d) All the above
Answer:
d) All the above

Question 29.
The ………….. is a multi-path decision-making statement.
a) if-else ladder
b) Simple if
c) if… else
d) None of these
Answer:
a) if-else ladder

Question 30.
In ……………..type of statement ‘if’ is followed by one or more else if statements and finally end with an else statement.
a) if-else ladder
b) Simple if
c) if… else
d) None of these
Answer:
a) if-else ladder

Question 31.
The……………. operator is an alternative for the if-else statement.
a) Conditional
b) Ternary
c) Continue
d) Either A or B
Answer:
d) Either A or B

Question 32.
The conditional operator consists of …………….. symbols.
a) two
b) three
c) four
d) five
Answer:
a) two

Question 33.
The conditional operator takes …………….. arguments.
a) two
b) three
c) four
d) five
Answer:
b) three

Question 34.
The switch statement is a …………… statement.
a) Multi-way branch
b) Two-way branch
c) Jump
d) None of these
Answer:
a) Multi-way branch

Question 35.
………….. statement provides an easy way to dispatch execution to different parts of code based on the value of the expression.
a) if..else
b) switch
c) goto
d) None of these
Answer:
b) switch

Question 36.
The ………………statement replaces multiple if-else sequences.
a) if..else
b) switch
c) go to
d) None of these
Answer:
b) switch

Question 37.
The expression provided in the switch should result in a…………… value.
a) Constant
b) Variant
c) Null
d) None of these
Answer:
a) Constant

Question 38.
In switch statement …………… statement is optional.
a) default
b) break
c) Both A and B
d) None of these
Answer:
c) Both A and B

Question 39.
The …………… statement is used inside the switch to terminate a statement sequence.
a) default
b) break
c) continue
d) None of these
Answer:
b) break

Question 40.
In a switch statement, when a ………….. statement is reached, the flow of control jumps to the next line following the switch statement.
a) go to
b) break
c) continue
d) None of these
Answer:
b) break

Question 41.
……………. statement checks only for equality.
a) go to
b) if,.else
c) continue
d) switch
Answer:
d) switch

Question 42.
………….. statement checks for equality as well as for logical expression.
a) go to
b) if..else
c) continue
d) switch
Answer:
b) if..else

Question 43.
………….. statement uses a single expression for multiple choices.
a) go to
b) if..else
c) continue
d) switch
Answer:
d) switch