Category: Class 6

Students can download 6th Science Term 1 Chapter 3 Matter Around Us Questions and Answers, Notes, Samacheer Kalvi 6th Science Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus, helps students complete homework assignments and to score high marks in board exams.

Tamilnadu Samacheer Kalvi 6th Science Solutions Term 1 Chapter 3 Matter Around Us

Samacheer Kalvi 6th Science Matter Around Us Text Book Back Questions and Answers

I. Choose the correct answer:

Question 1.
………. is not made of matter
(a) Gold ring
(b) iron nail
(c) light ray
(d) oil drop
Answer:
(a) light ray

Question 2.
200 ml of water is poured into a bowl of 400ml capacity. The volume of water now will be _____
(a) 400 ml
(b) 600 ml
(c) 200 ml
(d) 800 ml
Answer:
(c) 200 ml

Question 3.
Seeds from water-melon can be removed by method.
(a) Hand-picking
(b) filtration
(c) magnetic separation
(d) decantation
Answer:
(c) Hand picking

Question 4.
Lighter impurities like dust, when mixed with rice or pulses, can be removed by _____
(a) filtration
(b) sedimentation
(c) decantation
(d) winnowing
Answer:
(d) winnowing

Question 5.
………… of is essential to perform winnowing activity
(a) Rain
(b) Soil
(c) Water
(d) Air
Answer:
(d) Air

Question 6.
Filtration method is effective in separating _____ mixture.
(a) solid – solid
(b) solid – liquid
(c) liquid – liquid
(d) liquid – gas
Answer:
(b) solid – liquid

Question 7.
From the following ………. is not a mixture
(a) Coffee with milk
(b) lemon juice
(c) Water
(d) ice cream embedded with nuts.
Answer:
(c) Water

II. State whether the following statements are True or False. If false give the correct statement

1. Air is not compressible.
2. Liquids have no fixed volume but have fixed shape.
3. Particles in solids are free to move.
4. Then pulses are washed with water before cooking, the water is separated from them by the process of filtration.
5. Strainer is a kind of sieve which is used to separate a liquid from solid
6. Grain and husk can be separated by winnowing
7. Air is a pure substance
8. Butter from curds is separated by sedimentation.

Answer:

1. False. Air is Compressible.
2. False. Liquids have no fixed shape but have fixed volume.
3. False Particles in solids are not free to move.
4. False. When pulses are washed with water before cooking, the water is separated from them by the process of Decantation.
5. False. Strainer is a kind of sieve which is used to separate a solid from liquid.
6. True.
7. False. Air is a mixture. (Or) Air is not a pure substance.
8. False. Butter from curds is separated by churning.

III. Match the following

Question 1.

Answer:
1. – d
2. – e
3. – b
4. – c
5. – a

Question 2.

Answer:

IV. Fill in the blanks

1. Matter is made up of ………
2. In solids, the space between the particles is less than in ……….
3. Grains can be separated from their stalks by ……….
4. Chillies are removed from ‘upma’ by ……… method.
5. The method employed to separate clay particles from water is ……….
6. Among the following items: Safety pins, pencil and rubber band, ………. will get attracted to a magnet.
7. Water obtained from tube wells is usually ………. water

Answer:

1. Atoms
2. An Liquids
3. Threshlng
4. Hand picking
5. Filtration
6. Safety pins
7. Impure

V. Complete the given analogy

1. Solid: rigidity :: gas: …………
2. Large Inter-particle space: gas:: ………. : solid
3. Solid : definite shape :: ……… : shape of the vessel.
4. Husk-grains: winnowing:: Sawdust-chalk piece: ………..
5. Murukku from hot oil: ………. :: coffee powder residue from decoction
6. Iron-sulphur mixture: ……….. :: Mustard seeds from Urad-dhal: Rolling

Answer:

1. Compressibility
2. Little inter-particle space
3. Liquids
4. Sedimentation and Decantaium
5. Hand picking; Filtralion.
6. Magnetic Separation.

VI. Very short answer

Question 1.
Define the term matter.
Answer:
The matter is defined as anything that has mass and takes up space. The matter is found in solid, liquid, and gas.

Question 2.
How can husk or fine dust particles be separated from rice before cooking?
Answer:
Before cooking, the husk or fine dust particles in rice are being separated by ‘Sedimentation’. The lighter impurities float while heavier rice grains sink to the bottom.

Question 3.
Why do we separate mixtures?
Answer:
A mixture is an impure substance and contains more than one kind of particles. So, we have to separate mixtures.

Question 4.
Give an example for mixture and justify your answer with reason.
Answer:
An example of a mixture is 22 Carat Gold. This is composed of Gold and Copper (or) Gold and Cadmium.

Question 5.
Define Sedimentation.
Answer:
Sedimentation is the deposition process of setting down of heavy solids in a mixture of liquid and an insoluble solid.

Question 6.
Give the main difference between a pure substance and an impure substance.
Answer:
Pure Substance :
Made up of only one kind of particles.
Cannot be separated by physical means.

Impure Substance :
Has particles of other Substance mixed in it.
Can be separated by physical means.

VII. Short Answer.

Question 1.
A rubber ball changes its shape on pressing. Can it be called a solid?
Answer:
Yes. A solid has a certain shape and size. The shape of a rubber ball changes only if we squeeze it.

Question 2.
Why do gases not have fixed shape?
Answer:
Gases do not have a fixed shape due to the weak forces of attraction between the gaseous particles. Hence, they can flow and take shape of the container.

Question 3.
What method will you employ to separate cheese (paneer) from milk? Explain.
Answer:
“Churning followed by Coagulation” is employed to separate cheese (Paneer) from milk. There are six important steps in making cheese (Paneer) from milk:

1. Acidification
2. coagulation
3. separating curds and whey
4. Salting
5. shaping
6. ripening

Question 4.
Look at the picture given below and explain the method of separation illustrated.

Answer:
The given picture shows the ‘Sieving’ method of separation. It is used to separate the solid particles of different sizes. Example: Bran from flour; Sand from gravel.

Question 5.
How can you separate a mixture of a large number of tiny bits of paper mixed with pulses/dal?
Answer:
We can separate the mixture of a large number of tiny bits of paper and pulses/dal by “Winnowing”. The lighter papers will be carried by wind and heavier pulses/dais will fall closer and form a separate heap.

Question 6.
What is meant by food adulteration?
Answer:
The process of mixing harmful and unwanted substances with the foodstuffs that we buy in the market is called food adulteration

Question 7.
Mr. Raghu returns home on a hot summer day and wants to have buttermilk. Mrs. Raghu has only curds. What can she do to get buttermilk? Explain.
Answer:
Mrs. Raghu has to take half a cup of curd, add half a cup of water to it, and mix well. Now, she can serve buttermilk.

VIII. Answer In Detail.

Question 1.
Distinguish between properties of solid, liquid, gas. Draw a suitable diagram.
Answer:

Question 2.
Using a suitable apparatus from your laboratory, separate the mixture of chalk powder, mustard oil, water, and coins. Draw a flow chart to show the separation process.
Answer:

HOTS

Question 1.
Malar’s mother was preparing to cook dinner. She accidentally mixed ground nuts with urad-dhal. Suggest a suitable method to separate the two substances so that Malar can have ground nuts to eat.
Answer:
The groundnuts shall be separated by hand-picking method because they are in a different size When compared with urad-dhal.

Question 2.
In a glass containing some water, tamarind juice and sugar is added and stirred well. Is this a mixture-can you tell why? Will this solution be sweet? Or sour? Or both sweet and sour?
Answer:

1. A glass containing some water, Tamarind juice, and sugar is a mixture.
2. Because it is made up of two or more ingredients that are physically separable.
3. This mixture is both sweet and sour.

Question 3.
Justify your answer.
An arrangement of particles in three different phases of matter is shown above.

(a) Which state is represented by fig. I?
Answer:
Figure 1 represents a gas.

(b) In which will be the interparticle attraction maximum?
Answer:
Inter Particle attraction is maximum in solids (fig. 3)

(c) Which one of them cannot be contained in an open vessel?
Answer:
A gas (fig. 1) cannot be contained in an open vessel.

(d) Which one can take the shape of its container?
Answer:
Liquid (fig.2) can take the shape of its container.

Samacheer Kalvi 6th Science Matter Around Us Additional Important Questions and Answers

I. Choose The Correct Answer

Question 1.
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) Air
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (iii) and (iv)
Answer:
(c) (i) and (iv)

Question 2.
A standard sheet of paper is about atoms thick.
(a) Thousands
(b) Crores
(c) Lakhs
(d) Million
Answer:
(d) Million

Question 3.
Which among the following is not a matter?
(a) Electron
(b) Blood
(c) Moonrock
(d) Humidity
Answer:
(a) Electron

Question 4.
One dot that you make with your pen has more than ______ lakh molecules.
(a) One
(b) Two
(c) Four
(d) Three
Answer:
(b) Two

Question 5.
Pure rava, when adultered with wheat flour, is separated by
(a) Sieving
(b) Filtration
(c) Winnowing
(d) Threshing
Answer:
(a) Sieving

II. Match the following

Answer:
1. – b
2. – d
3. – a
4. – c

III. Fill in the blanks

1. ……… particles are tightly packed into a definite shape.
2. The tendency of particles to spread out in order to occupy the available space is ………..
3. The purest form of gold is denoted by ………..
4. Milk is a ………..
5. The principle of ………. is used in washing machines.

Answer:

1. Solid
2. diffusion
3. 24 carat
4. mixture
5. centrifugation

IV. Very short answer.

Question 1.
Name the two microscopes which are used to identify the structure of the atom.
Answer:

1. SEM – Scanning Electron Microscope
2. TEM – Tunnelling Electron Microscope

Question 2.
What type of matter glass is?
Answer:
Glass is looking like a solid, but not. It is actually a very slow-moving liquid.

Question 3.
Give two examples of diffusion.
Answer:

1. Spread of a drop of ink in a glass of water.
2. Spread of the smell of an incense stick.

Question 4.
Mention the method of separation of Bran from flour. Explain.
Answer:
Bran from flour is separated by ‘sieving’.
Solid particles of different sizes can be separated by sieving.

Question 5.
Define the term ‘Liquefaction of gases’.
Answer:
The process by which substances in their gaseous state are converted to the liquid state is called Liquefaction of gases.

V. Answer in detail

Question 1.
What are the similarities between a gas and a liquid?
Answer:

1. Neither gas nor a liquid has a definite shape.
2. The particles of gases and liquids can move. We call this movement diffusion.
3. Liquids can evaporate into gases and the gases can condense into liquids.
4. They can have the property of compressibility to some extent.

Question 2.
How do decantation and filtration differ and which is faster?
Answer:

Note: Normally filtration will give a better separation than decantation.

Students can download 6th Science Term 2 Chapter 3 Changes Around Us Questions and Answers, Notes, Samacheer Kalvi 6th Science Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus, helps students complete homework assignments and to score high marks in board exams.

Tamilnadu Samacheer Kalvi 6th Science Solutions Term 2 Chapter 3 Changes Around Us

Samacheer Kalvi 6th Science Changes Around Us Text Book Back Questions and Answers

I. Choose the Correct Answer

Question 1.
When ice melts to form water, change occurs in its
(a) position
(b) colour
(c) state
(d) composition
Answer:
(c) State

Question 2.
Drying of wet clothes in air is an example of
(a) Chemical change
(b) Undesirable change
(c) irreversible change
(d) physical change
Answer:
(d) Physical change

Question 3.
Drying of wet clothes in air Is an example of
(a) Chemical change
(b) Undesirable change
(c) irreversible change
(d) physical change
Answer:
(d) physical change

Question 4.
Out of the following an example of a desirable change ¡s
(a) rusting
(b) change of seasons
(c) earthquake
(d) flooding
Answer:
(b) change of seasons

Question 5.
Air pollution leading to Acid rain is a
(a) reversible change
(b) fast change
(c) natural change
(d) human made change
Answer:
(d) human made change

II. Fill in the blanks

1. Magnet attracts iron needle. This is ……… change, (a reversible / an irreversible)
2. Boiling of egg results in ………… change, (a reversible / an irreversible)
3. Changes that are harmful to us are ………… (desirable / undesirable)
4. Plants convert Carbon-di-oxide and water into starch. This is an example of ………. change, (natural / human made)
5. Bursting of fire crackers is a ……….. change whereas germination of seeds is a ………. change, (slow / fast)

Answer:

1. a reversible
2. an irreversible
3. undesirable
4. Natural
5. fast; slow

III. True or False. If False, give the correct statement

1. Growing of teeth in an infant is slow change.
2. Burning of match stick is a reversible change.
3. Change of New moon to Full moon is human made.
4. Digestion of food is a physical change.
5. In a solution of salt in water, water is the solute.

Answer:

1. True
2. False – It is an irreversible change
3. False – It is a Natural change
4. False – It is a Chemical change
5. False – Water is the solvent

IV. Analogy

Question 1.
Curdling of milk : irreversible change ::
Formation of clouds : ……….. change
Answer:
reversible

Question 2.
Photosynthesis : ……….. change ::
burning of coal : Human – made change
Answer:
Natural

Question 3.
Dissolving of glucose: reversible change ::
Digestion of food : ………… change
Answer:
Irreversible

Question 4.
Cooking of food : desirable change ::
decaying of food : ………… change
Answer: undesirable

Question 5.
Burning of matchstick: ………… change ::
Rotation of the Earth : Slow change
Answer:
Fast

V. Circle the odd one out. Give reason for your choice

Question 1.
Growth of a child, Blinking of eye, Rusting, Germination of a seed.
Answer:
Blinking of eye (a fast change)

Question 2.
Glowing of a bulb, lighting of a Candle, breaking of a coffee mug, curdling of milk.
Answer:
Curdling of milk (a chemical change)

Question 3.
Rotting of an egg, condensation of water vapour, trimming of hair, Ripening of fruit.
Answer:
Trimming of hair (Man-made change)

Question 4.
Inflating a balloon, popping a balloon, fading of wall paint, burning of kerosene
Answer:
Burning of Kerosene (Chemical change)

VI. Give a very short answer

Question 1.
What kind of change is associated with the decaying of plants?
Answer:
Decaying of plants is associated with slow change and chemical change.

Question 2.
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
Answer:
Yes, I can make a doll from the candle. The kind of change is a physical change.

Question 3.
Define a slow change.
Answer:
Changes which take place over a long period of time (hours/days/months/years) are known as slow changes.

Question 4.
What happens when cane sugar is strongly heated? Mention any two changes in it.
Answer:
When Cane sugar is strongly heated, it will initially melt and after that start to decompose. It will turn brown and then black and give off fumes.
The changes involved are:

1. Physical change
2. irreversible change

Question 5.
What is the solution?
Answer:
When a solute is dissolved in a solvent, it forms a solution.
Solute + solvent → solution.

VII. Give a short answer

Question 1.
What happens when the paper is burnt? Explain.
Answer:
When the paper is burnt, oxygen from the air combines with carbon in the paper turning into carbon dioxide and water vapor which float away, leaving solid ash. The action of burning paper can’t be reversed. So, it is an irreversible change. Also, it is a Chemical change and a Fast change.

Question 2.
Can deforestation be considered a desirable change? Explain.
Answer:

1. Deforestation cannot be considered a desirable change.
2. Because it is harmful to our environment and not desired by us are known as Undesirable changes.

Question 3.
What type of changes is associated with the germination of a seed? Explain.
Answer:

1. Germination of seed is a slow change.
2. Changes which take place over a long period of time (days) are known as Slow changes.

VIII. Answer in detail

Question 1.
Give one example in each case that happens around you.
(a) Slow and fast change
(b) Reversible and irreversible change
(c) Physical and chemical change
(d) Natural and man-made change
(e) Desirable and undesirable change
Answer:

IX. Questions Based on Higher Order Thinking Skills (HOTS)

Question 1.
When a candle is lit the following changes are observed.
Answer:

1. Wax melts.
2. Candle keeps burning.
3. The size of the candle decreases.
4. The molten wax solidifies

Question 2.
Which of the changes can be reversed? Justify your answer.
Answer:
When the candle is burning, the heat of the flame melts the solid wax to liquid wax. This signifies reversible (or) Physical changes. Also, as the wax melts, the size of candle decreases. If then molten wax solidifies and takes a different shape.

Samacheer Kalvi 6th Science Changes Around Us Additional Important Questions and Answers

I. Choose the appropriate answer

Question 1.
Water changes into ice on cooling are called as
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
Answer:
(d) freezing

Question 2.
_______ is the process in which something becomes different from what it was earlier.
(a) Classification
(b) Composition
(c) Position
(d) Change
Answer:
(d) Change

Question 3.
Evaporation of water from lakes and river
(a) Slow change
(b) Fast change
(c) Natural change
(d) Both (a) and (b)
Answer:
(d) Both (a) and (b)

Question 4.
_______ change is a temporary change
(a) Physical
(b) Chemical
(c) Undesirable
(d) slow
Answer:
(a) Physical

Question 5.
The blackening of the Silver anklet is a (an)
(a) Irreversible change
(b) Temporary change
(c) Short term change
(d) Periodical change
Answer:
(a) Irreversible change

II. Fill in the blanks

1. A change in which a new substance is formed is called ………….
2. Formation of coal is a …………
3. An example of natural as well as an undesirable change is ………..
4. ……… is the Universal Solvent.
5. Eco-friendly changes are ………

Answer:

1. Chemical Change
2. Slow Change
3. Earthquake
4. Water
5. Desirable changes

III. Match the following

Answer
i. – d
ii. – a
iii. – b
iv. – c

IV. Analogy

Question 1.
Rusting of Iron : undesirable change : : Dead plants turn into manure : …………..
Answer:
Desirable change

Question 2.
Touch me not plant: ………… : : digestion of food : Irreversible change
Answer:
Reversible change

Question 3.
Change of seasons : slow change : : Breaking of glass : …………..
Answer:
fast change

Question 4.
Earth quake : undesirable change : : Heartbeat: ………….
Answer:
desirable change

Question 5.
Silver articles turning black : ………… : : Boiling of H₂O : physical change
Answer:
Chemical change

V. Very short answer

Question 1.
What is the change?
Answer:
Change is the observable difference between the initial state and the final state of any substance.

Question 2.
What is a reversible change?
Answer:
Changes which can be reversed (to get back to the original state) are known as reversible changes.

Question 3.
What is melting? Give example.
Answer:
The conversion of a solid into a liquid by heating is called melting. Ex.: Ice into water.

Question 4.
Water is the universal solvent. Why?
Answer:
Water is known as the universal solvent. It dissolves a wide range of substances.

VI. Long answer

Question 1.
Distinguish between the physical and chemical changes.
Answer:

Question 2.
Tabulate some changes taking place in our body system with its type.
Answer:

Students can download 6th Science Term 2 Chapter 1 Heat Questions and Answers, Notes, Samacheer Kalvi 6th Science Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus, helps students complete homework assignments and to score high marks in board exams.

Tamilnadu Samacheer Kalvi 6th Science Solutions Term 2 Chapter 1 Heat

Samacheer Kalvi 6th Science Heat Text Book Back Questions and Answers

I. Choose the correct answer:

Question 1.
When an object is heated, the molecules that make up the object
(a) begin to move faster
(b) lose energy
(c) become heavier
(d) become lighter
Answer:
(a) begin to move faster

Question 2.
The unit of heat is
(a) newton
(b) joule
(c) volt
(d) Celsius
Answer:
(b) joule

Question 3.
One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be
(a) 80°C
(b) More than 50°C but less than 80°C
(c) 20°C
(d) around 40°C
Answer:
(d) around 40° C

Question 4.
An iron ball at 50°C is dropped in a mug containing water at 50°C. The heat will
(a) flow from iron ball to water.
(b) not flow from iron ball to water or from water to iron ball.
(c) flow from water to iron ball.
(d) increase the temperature of both.
Answer:
(b) not flow from iron ball to water or from water to iron ball.

II. Fill in the Blanks

1. Heat flows from a ……….. body to a ………… body.
2. The hotness of the object is determined by its ………..
3. The SI unit of temperature is …………
4. Solids ……….. on heating and ………… on cooling.
5. Two bodies are said to be in the state of thermal ………… if there is no transfer of heat taking place.

Answer:

1. hot, cold
2. temperature
3. Kelvin
4. expand, contract
5. equilibrium

III. True or False. If False, give the correct answer.

1. Heat is a kind of energy that flows from a hot body to a cold body.
2. Steam is formed when heat is released from water.
3. Thermal expansion is always a nuisance.
4. Borosilicate glass do not expand much on being heated.
5. The unit of heat and temperature are the same.

Answer:

1. True
2. False – Steam is formed when the heat is absorbed from the water.
3. False – Thermal expansion is always not a nuisance.
4. True
5. False – Unit of heat and temperature are different.

IV. Give reasons for the following

Question 1.
An ordinary glass bottle cracks when boiling water is poured into it, but a borosilicate glass bottle does not.
Answer:
The reason is that the borosilicate glass does not expand much on being heated and therefore they do not crack.

Question 2.
The electric wire which sag in summer become straight in winter.
Answer:

1. During summer thermal expansion takes place in electric wire.
2. In winter it contracts so it becomes straight.

Question 3.
Rivet is heated before fixing in the hole to join two metal plates.
Answer:

1. When we heat rivet expansion takes place and becomes soft.
2. One end of the rivet is hammered to form a new head.
3. When cooled, the rivet will contract and hold tightly.

V. Match the following

Answer:
1. – e
2. – c
3. – d
4. – a
5. – b

VI. Analogy

1. Heat: Joule :: Temperature : ………
2. Ice cube : 0°C :: Boiling water : ………..
3. Total Kinetic Energy of molecules: Heat:: Average Kinetic Energy : …………….

Answer:

1. Kelvin
2. 100° C
3. Temperature

VII. Give Very Short Answer:

Question 1.
Make a list of electrical types of equipment at home from which we get heat.
Answer:
Water heater, Iron box, Electric kettle, Micro oven.

Question 2.
What is the temperature?
Answer:
The measurement of the warmness or coldness of a substance is known as its temperature.

Question 3.
What is thermal expansion?
Answer:
The expansion of a substance on heating is called thermal expansion.

Question 4.
What do you understand by thermal equilibrium?
Answer:
When two objects in thermal contact, no longer affect each other’s temperature, there exists Thermal equilibrium.

VIII. Give Short Answer:

Question 1.
What difference do you think heating the solid will make in their molecules?
Answer:

1. When we heat solids the vibrations and movement of molecules will increase.
2. The temperature of the object increases.
3. The distance between molecules will increase.

Question 2.
Distinguish between heat and temperature.
Answer:

IX. Answer in detail:

Question 1.
Explain thermal expansion with suitable examples.
Answer:
Thermal expansion: The expansion of a substance on heating is called, the thermal expansion of that substance.

Fitting the iron rim on the wooden wheel:

1. The diameter of the iron ring is slightly less than that of the wooden wheel.
2. So, it cannot be easily slipped on from the rim of a wooden wheel.
3. The iron ring is, therefore, first heated to a higher temperature so that it expands in size and the hot ring is then easily slipped over to the rim of the wooden wheel.
4. Coldwater is now poured on the iron ring so that it contracts in size and holds the wooden wheel tightly.

Rivetting:

1. Rivets are used to join two steel plates together.
2. Hot rivet is driven through the hole in the plates.
3. One end of the rivet is hammered to form a new rivet head.
4. When cooled, the rivet will contract and hold the two plates tightly together.

Cracking of a thick glass tumbler:

1. Glass is a poor conductor of heat.
2. When hot liquid is poured into the tumbler, the inner surface of the tumbler becomes hot and expands while the outer surface remains at room temperature and does not expand.
3. Due to this unequal expansion, the tumbler cracks.

X. Questions based on Higher Order Thinking Skills

Question 1.
When a window is accidentally left open on a winter night, will you feel uncomfortable because the cold is getting in, or because the heat is escaping from the room?
Answer:

1. When a window is left open on a winter night I will feel uncomfortable because the heat is escaping from the room.
2. The heat will transfer from high temperature to low temperature.
3. During winter cold air enters the room, so room temperature will decrease.

Question 2.
Suppose your normal body temperature was lower than what it is. How would the sensation of hot and cold change?
Answer:

1. When our body temperature is lower than normal temperature, We feel hot from the surrounding.
2. Because the surrounding temperature will be high compare to our body.

Question 3.
If you heat a circular disk with a hole, what change do you expect in the diameter of the hole? Remember that the effect of heating increases the separation between any pair of particles.
Answer:
Many of us “expect” that the diameter of the hole will decrease because the circular disk is free to expand in all directions as well. Note that expansion of metal due to heating is not like gas spreading out wherever space is available. The correct way to think about it is as follows: Hole size is irrelevant in this case. So we can think that hole is very large.

If we carve a hole so large that its radius is slightly less than that of the circular disk itself, then we will have a ring. It is obvious that the radius of the ring will increase, as atoms have more energy so their oscillation amplitude will increase. As the diameter of the ring increases, the diameter of the hole will also increase.

For example, if you want to insert one hallow pipe inside another hollow pipe of the same diameter, just heat anyone and insert the second one into the heated pipe. This explains the answer in an easy way. So it says that diameter will increase with increasing temperature.

Samacheer Kalvi 6th Science Heat Additional Important Questions and Answers

I. Choose the right answer:

Question 1.
When an electric current is passing through the conductor …………… energy is produced.
(a) Electric
(b) Heat
(c) Chemical
(d) Kinetic energy
Answer:
(b) Heat

Question 2.
One day in 1922, the air temperature was measured at 59°C in the shade in Libya ________
(a) America
(b) Africa
(c) Antarctica
(d) Europe
Answer:
(b) Africa

Question 3.
The temperature of boiling water is …………..
(a) 0° C
(b) 32° C
(c) 100° C
(d) 110° C
Answer:
(c) 100°C

Question 4.
The temperature determines the direction flow of _______
(a) heat energy
(b) kinetic energy
(c) potential energy
(d) light energy
Answer:
(a) heat energy

Question 5.
When we cool the liquid it will become …………..
(a) Gas
(b) Solid
(c) Vapour
(d) None
Answer:
(b) Solid

II. Say True or False.

1. Heat is measured in Celsius or centigrade.
2. Temperature in the form of energy.
3. The normal temperature of our body is 37°C.
4. Two objects are said to be in thermal contact if they can exchange heat energy.
5. When the vibrations move from one molecule to another molecule heat will flow.

Answer:

1. False
2. False
3. True
4. True
5. True

III. Match the Following:

Answer
1. – iv
2. – i
3. – ii
4. – v
5. – iii

IV. Analogy

1. Summer : Sag :: Winter : …………
2. Evaporation : 100°C :: Freezing : …………

Answer:

1. contract
2. 0°C

V. Give reasons for the following:

Question 1.
Gaps are left in between rails while laying a railway track.
Answer:
Reason: During summer thermal expansion takes place.

Question 2.
Hot metal ball of 80° C is dipped into water of 80°C. The ball will not contract.
Answer:
Reason: Both are in same temperature.

VI. Very Short Answer:

Question 1.
What are the sources of heat?
Answer:

1. The main source of heat is Sun.
2. Other sources are combustion, friction and electricity.

Question 2.
Define – heat.
Answer:
Heat is an energy that raises the temperature of a thing by causing the molecules in that thing to move faster.

Question 3.
How will you identify two objects are said to be in thermal equilibrium?
Answer:
Two objects in thermal contact have same temperature they are said to be in thermal equilibrium.

Question 4.
What are the measuring unit of temperature?
Answer:
SI unit of temperature is kelvin. Celsius and Fahrenheit are the other units used.

Question 5.
What will determine the direction of flow of heat from one object to another?
Answer:
Temperature will determine the direction of the flow of heat.

VII. Long Answer Questions:

Question 1.
Explain linear expansion with an experiment.
Answer:

1. The expansion in length is called linear expansion.
2. Take a bulb, dry cell, candle, cycle spoke, coin, and two wooden boxes.
3. Place one end of the cycle spoke on a wooden block and connect an electric wire to it. Put a stone over the spoke to hold it.
4. The other one of the cycle spoke is placed on another wooden block.
5. Wrap some electric wire around the coin and place it on the block. Put a stone over the coin to hold it in place.
6. Connect bulb and dry cell to the free ends of wires connected to the coin and the spoke and make the circuit.
7. When we heat the cycle spoke with a candle the length will expand and touches the coin.
8. So the circuit completes, the bulb will glow.
9. When we cool the spoke it contracts and does not touch the coin. So the circuit will disconnect, the bulb will not glow.

Students can download 6th Science Term 1 Chapter 7 Computer – An Introduction Questions and Answers, Notes, Samacheer Kalvi 6th Science Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus, helps students complete homework assignments and to score high marks in board exams.

Tamilnadu Samacheer Kalvi 6th Science Solutions Term 1 Chapter 7 Computer – An Introduction

Samacheer Kalvi 6th Science Computer – An Introduction Text Book Back Questions and Answers

I. Choose the correct answer:

Question 1.
Who is the father of computer?
a. Martin Luther King
b. Graham Bell
c. Charlie Chaplin
d. Charles Babbage
Answer:
d. Charles Babbage

Question 2.
Which of the following is another form of computer?
(a) Blackboard
(b) Mobile
(c) Radio
(d) Book
Answer:
(b) Mobile

Question 3.
When was the first computer introduced?
a. 1980
b. 1947
c. 1946
d. 1985
Answer:
c. 1946

Question 4.
Who is the computer’s first programmer?
(a) Lady Wellington
(b) Augusta ado Lovelace
(c) Mary Curie
(d) Mary Comb
Answer:
(b) Augusta ado Lovelace

Question 5.
Pick out the odd one?
a. Calculator
b. Abacus
c. Flash Card
d. Laptop
Answer:
c. Flash Card

II. Fill in the blanks:

1. Data is ………… Information.
2. World’s first general purpose computer is ……….
3. Information is ……… data
4. Fifth generation computer has ………. Intelligence.
5. ………… is the device that uses Index number.

Answer:

1. Processed
2. Electronic Numerical Integrator and computer
3. a form of processed
4. Artificial
5. Analog Computer

III. State True or false.

1. The computer is an Electronic device.
2. Sir Isaac Newton invented the Computer.
3. The computer can do calculations fast.

Answer:

1. True
2. False
3. True

IV. Match the following:

Answer:
1. – c
2. – d
3. – b
4. – e
5. – a

V. Answer the following

Question 1.
What is a Computer?
Answer:
Computer is an electronic device that processes data and information according to our needs.

Question 2.
Who are the pioneers/forerunners of computers?
Answer:
1. Charles Babbage: a professor in mathematics has designed an analog computer. He is known as the father of computers.
2. Augusta Ada Lovelace: the first programmer as she developed essential commands for mathematical operations.

Question 3.
Write a short note on Data.
Answer:

1. Data is the information that has to be processed.
2. They are in the form of numbers, alphabets, and images.

Question 4.
Name any four input devices.
Answer:
Keyboard, Mouse, Bar code reader, Digital camera, etc.

Question 5.
Differentiate Hardware and Software.
Answer:
Hardware: The parts that are available on the computer that helps the software to work.
Software: The commands or programs that are used on a computer.

VI. Answer in Details.

Question 1.
Explain in detail the Applications of the computer.
Answer:

1. The computer is used in textile shops for billing purposes.
2. It is used in the railway station for issuing tickets.
3. It is used in the banks for multi-purpose.
4. It is used in ATMs.
5. It is used in the Post office.

Students can download 6th Science Term 1 Chapter 6 Health and Hygiene Questions and Answers, Notes, Samacheer Kalvi 6th Science Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus, helps students complete homework assignments and to score high marks in board exams.

Tamilnadu Samacheer Kalvi 6th Science Solutions Term 1 Chapter 6 Health and Hygiene

Samacheer Kalvi 6th Science Health and Hygiene Text Book Back Questions and Answers

I. Choose the correct answer:

Question 1.
Our body needs for muscle-building
(a) Carbohydrate
(b) fat
(c) Protein
(d) Water
Answer:
(c) Protein

Question 2.
Scurvy is caused due to the deficiency of _______
(a) Vitamin A
(b) Vitamin B
(c) Vitamin C
(d) Vitamin D
Answer:
(c) Vitamin C

Question 3.
Calcium is an example of a
(a) Carbohydrate
(b) fat
(c) Protein
(d) minerals
Answer:
(d) minerals

Question 4.
We should include fruits and vegetables in our diet, because _______
(a) They are the best source of Carbohydrates
(b) They are the best source of Proteins
(c) They are rich in minerals and Vitamins
(d) They have high water content
Ans:
(c) They are rich in minerals and Vitamins

Question 5.
Bacteria are very small microorganism.
(a) Prokaryotic
(b) Eukaryotic
(c) Protozoa Acellular
(d) Acellular
Answer:
(a) prokaryotic

II. True or False

1. There are three main nutrients present in food.
2. Fats are used as an energy store by our body.
3. All bacteria have flagella.
4. Iron helps in the formation of haemoglobin.
5. Virus can grow and multiply outside host.

Answer:

1. False
2. True
3. False
4. True
5. False

III. Fill in the blanks

1. Malnutrition leads to …………
2. Iodine deficiency leads to ……… in adults.
3. Vitamin D deficiency causes ………..
4. Typhoid is transmitted due to contamination of ……….. and water.
5. Influenza is a ………. disease.

Answer:

1. Deficiency diseases
2. Goitre
3. Rickets and water.
4. Food
5. Viral

IV. Complete the Analogy

1. Rice: Carbohydrate : : Pulses: …………
2. Vitamin D: Rickets : : Vitamin C: …………..
3. Iodine: Goitre : : Iron: ……………
4. Cholera: Bacteria : : Smallpox: ………….

Answer:

1. Protein
2. Scurvy
3. Anemia
4. Virus

V. Match the Following

Answer:
1. – b
2. – d
3. – e
4. – a
5. – c

VI. Complete the Diagram

Answer:

VII. Write a Short Answer.

Question 1.
Write two examples for each of the following.
(a) Food items rich in fat.
(b) Vitamin deficiency diseases.
Answer:
(a) Food items rich in fat: Meat, fish, egg yolk, milk.
(b) Vitamin deficiency diseases: Night blindness, Beriberi, Scurvy, Rickets.

Question 2.
Differentiate between Carbohydrate and Protein.
Answer:
Carbohydrate:

1. Energy giving component of the food.
2. The sources of carbohydrates are nuts, fruits, rice, and maize.

Protein:

1. It is body building foods.
2. The sources of proteins are pulses, soybean, nuts, egg, and fish.

Question 3.
Define the term “Balanced diet”.
Answer:
A diet which contains a sufficient amount of various nutrients to ensure good health is called a Balanced diet.

Question 4.
Why should the fruits and vegetables not to be washed after cutting? Vitamins are of two types.
Answer:
We should not wash the fruits and vegetables after cutting, because the minerals and protein in the fruits and vegetables will also be washed away.

Question 5.
Write any two viral diseases.
Answer:
Common cold, smallpox, polio are viral diseases.

Question 6.
What are the main features of a microorganism?
Answer:
Microorganism will be seen with the help of a microscope. They are very small in size.

VIII. Long Answers.

Question 1.
Tabulate the vitamins and their corresponding deficiency diseases.
Answer:

Samacheer Kalvi 6th Science Health and Hygiene Additional Important Questions and Answers

I. Choose the best options

Question 1.
Name the sunshine Vitamin
(a) A
(b) D
(c) C
(d) K
Answer:
(b) D

Question 2.
_______ is a highly rich source of protein.
(a) Nut
(b) Gram
(c) Chicken
(d) Soya bean
Answer:
(d) Soya bean

Question 3.
The minerals are called by this name:
(a) Energy Food
(b) Balance diet
(c) Food for growth
(d) protective food
Answer:
(d) protective food

Question 4.
Ben Ben is caused due to the deficiency of _______
(a) Vitamin C
(b) Vitamin D
(c) Vitamin K
(d) Vitamin B
Ans:
(d) Vitamin B

Question 5.
How much water is needed for a man in a day?
(a) 2L
(b) 3L
(c) 1.5L
(d) 1L
Answer:
(a) 2 lr

II. Matching

Answer:
1. – d
2. – c
3. – b
4. – a

III. Give Short Answers.

Question 1.
Define Nutrients.
Answers:
Chemical constituents of food which give us energy, help to build our body, and protect us from diseases are called Nutrients.

Question 2.
List the six important nutrition.
Answer:

1. Carbohydrate
2. Vitamins
3. Protein
4. Minerals
5. Fat
6. Water.

Question 3.
List out the types of vitamins.
Solution:
Vitamins are classified into six major types. They are Vitamin A, B, C, D, E, and K. In the type,
Vitamin B and C are water-soluble Vitamins
Vitamin A, D, E, K are Fat-soluble vitamins.

Question 4.
Differentiate between Kwashiorkor and Marasmus.
Answer:
Kwashiorkor:
Stunted growth.
Swelling of face and limbs diarrhea.

Marasmus:
Skinny appearance.
slow body growth.

Question 5.
What are food items contain minerals?
Answer:
Green leafy vegetables like spinach, pulses, eggs, milk, fish, and fruits are food items that contain minerals.

IV. Give detailed Answers

Question 1.
Fill ABCDE in this tabular column.
Answer:

Question 2.
What are the uses of exercise?
Answer:

1. It improves growth and development.
2. It delays aging.
3. It strengthens muscles and blood circulation.
4. It develops athletic skills and reduces weight.

Students can download Maths Chapter 2 Integers Ex 2.2 Questions and Answers, Notes, Samacheer Kalvi 6th Maths Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus, helps students complete homework assignments and to score high marks in board exams.

Tamilnadu Samacheer Kalvi 6th Maths Solutions Term 3 Chapter 2 Integers Ex 2.2

Miscellaneous Practice Problems

Question 1.
Write two different real-life situations that represent the integer -3.
Solution:
(i) A sapling planted at a depth of 3m
(ii) Sheela lost ₹ 3 on selling an apple.

Question 2.
Mark the following numbers on a number line.
(i) All integers which are greater than -7 but less than 7.
(ii) The opposite of 3.
(iii) 5 units to the left of -1.
Solution:

Question 3.
Construct a number line that shows the depth of 10 feet from the ground level and its opposite.
Solution:

Question 4.
identify the integers and mark on the number line that are at a distance of 8 units from – 6.
Solution:

Question 5.
Answer the following questions from the number line given below.

(i) Which integer is greater: G or K? Why?
(ii) Find the integer that represents C
(iii) How many integers are there between G and H?
(iv) Find the pairs of letters which are opposite of a number,
(v) Say True or False: 6 units to the left of D is -6.
Solution:
(i) K is greater. K represents -1 and G represents -3. Because it is to the right of G in the negative side of the number line.
(ii) C represents -4
(iii) G represents -3 and H represents 4.
∴ -2, -1, 0, 1, 2, 3 are the 6 numbers between G and H.
(iv) (C, H) and (E, J) are opposite pairs.
(v) False. 6 units to the left of D is 0. Because D represents +6 on the number line

Question 6.
If G is 3 and C is -1, what numbers are A and K on the number line?

Solution:
A (-3), K (7)

Question 7.
Find the integers that are 4 units to the left of 0 and 2 units to the right of -3?
Solution:
-4, -1

Challenge Problems

Question 8.
Is there the smallest and the largest number in the set of integers? Give reason.
Solution:
No, we cannot find the smallest (-) and largest (+) number in the set of integers, as the numbers on the number line extend on both sides without an end.

Question 9.
Look at the Celsius Thermometer and answer the following questions.

(i) What is the temperature that is shown in the Thermometer?
(ii) Where will you mark the temperature 5°C below 0° C in the Thermometer?
(iii) What will be the temperature, if 10° C is reduced from the temperature shown in the Thermometer?
(iv) Mark the opposite of 15° C in the Thermometer.
Solution:
(i) – 10°C
(ii) – 5°C
(iii) -20°C
(iv) -15°C

Question 10.
P, Q, R, and S are four different integers on a number line. From the following clues, find these integers and write them in ascending order.
(i) S is the least of the given integers.
(ii) R is the smallest positive integer.
(iii) The integers P and S are at the same distance from 0.
(iv) Q is 2 units to the left of integer R.
Solution:
S < Q < 0 < R < P

Question 11.
Assuming that the home to be the starting point, mark the following places in order on the number line as per instruction given below and write their corresponding integers.

Places: Home, School, library, Playground, Park, Departmental Store, Bus stand, Railway Station, Post Office, Electricity Board.
Instructions:

1. The bus stand is 3 units to the right of the Home.
2. The library is 2 units to the left of Home.
3. Departmental Store is 6 units to the left of Home.
4. The post office is 1 unit to the right of the Library.
5. Park is 1 unit right of Departmental Store.
6. Railway Station is 3 units left of Post Office.
7. Bus Stand is 8 units to the right of Railway Station.
8. School is next to the right of the Bus Stand.
9. Playground and Library are opposite to each other.
10. Electricity Board and Departmental Store are at equal distance from Home.

Solution:

1. 3
2. -2
3. -6
4. -1
5. -5
6. -4
7. 4
8. 4
9. 5
10. 2

Question 12.
Complete the table using the following hints.

(i) C1 : the first non-negative integer.
(ii) C3 : the opposite to the second negative integer.
(iii) C5 : the additive identity in whole numbers.
(iv) C6 : the successor of the integer in C2.
(v) C8 : the predecessor of the integer in C7.
(vi) C9 : the opposite to the integer in C5.
Solution:
(i) C1 : (0)
(ii) C3 : (2)
(iii) C5 : (0)
(iv) C6 : (-4)
(v) C8 : (-8)
(vi) C9 : (0)

Question 13.
The following bar graph shows the profit (+) and loss (-) of a small scale company (in crores) between the year 2011 to 2017.

(i) Write the integer that represents a profit or a loss for the company in 2014?
(ii) Denote by an integer on the profit or loss in 2016.
(iii) Denote by integers on the loss for the company in 2011 and 2012.
(iv) Say True or False: The loss is minimum in 2012.
(v) Fill in: The amount of loss in 2011 is _____ as profit in 2013.
Solution:
(i) Profit ₹ 45 crores. ∴ Ans : + 45
(ii) In 2016 neither profit nor loss happened. ∴ Ans : 0
(iii) In 2011 loss is 10 crores and in 2012 loss is 20 crores.
∴ -10 and-20.
(iv) False. In 2011 the company’s loss is minimum.
(v) The same. Because in 2013 the profit is 10 crores and in 2011 the loss is 10 crores.

Students can download Maths Chapter 5 Information Processing Ex 5.2 Questions and Answers, Notes, Samacheer Kalvi 6th Maths Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus, helps students complete homework assignments and to score high marks in board exams.

Tamilnadu Samacheer Kalvi 6th Maths Solutions Term 3 Chapter 5 Information Processing Ex 5.2

Miscellaneous Practice Questions 

Question 1.
Find HCF of 188 and 230 by Euclid’s game.
Solution:
By Euclid’s game HCF (a, b) = HCF (a, a – b) if a > b.
Here HCF (188, 230) = HCF (230, – 188) because 230 > 188
= HCF (188, 42) = HCF (146, 42)
= HCF (104, 42) = HCF (62, 42)
= HCF (42, 20) = HCF (22, 20)
= HCF (20,2) = HCF (18, 2) = 2
∴ HCF (230, 188) = 2

Question 2.
Write the numbers from 1 to 50. From that find the following.
i) The numbers which are neither divisible by 2 nor 7.
ii) The prime numbers between 25 and 40
iii) All square numbers upto 50.
Solution:
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50.
i) The numbers neither divisible by 2 nor 7 are 9, 11, 13, 15, 17, 19, 23, 25, 27, 29, 31, 33, 37, 39, 41, 43, 45, 47.
ii) The prime numbers between 25 and 40 are 29, 31, 37.
iii) Square numbers upto 50 are 1, 4, 9, 16, 25, 36, 49

Question 3.
Complete the following pattern.
(i) 1 + 2 + 3 + 4 = 10
2 + 3 + 4 + 5 = 14
___ + 4 + 5 + 6 = ___
4 + 5 + 6 + ___ = ___

(ii) 1 + 3 + 5 + 7 = 16
___ + 5 + 7 + 9 = 24
5 + 7 + 9 + ___ = ___
7 + 9 + ___ + 13 = ___

(iii) AB, DEF, HIJK, ___ , STUVWX
(vi) 20, 19, 17, ___ , 10, 5
Solution:
(i) 3, 18; 7, 22
(ii) 3; 11, 32; 11, 40
(iii) MNOPQ
(iv) 14

Question 4.
Complete the table by using the following instructions.

A : It is the 6th term in the Fibonacci sequence.
B : The predecessor of 2.
C : LCM of 2 and 3.
D : HCF of 6 and 20.
E : The reciprocal of 1/5.
F : The opposite number of -7.
G : The first composite number.
H : Area of a square of side 3 cm.
I : The number of lines of symmetry of an equilateral triangle.
After completing the table, what do you observe? Discuss.
Solution:
A – 8, B – 1, C – 6, D – 2, E – 5, F – 7, G – 4, H – 9, I – 3

Question 5.
Assign the number for English alphabets as 1 for A, 2 for B upto 26 for Z. Find the meaning of

Solution:
GOOD MORNING

Question 6.
Replace the letter with symbols as + for A, – for B, × for C, and ÷ for D. Find the answer for the pattern 4B3C5A30D2 by doing the given operations.
Solution:
Given the symbols + for A; – for B; × for C; + for D .
∴ 4B3C5A30D2 becomes
4 – 3 × 5 + 30 ÷ 2 Using BIDMAS rule
4 – 3 × 5 + 30 ÷ 2 = 4 – 3 × 5 + 15[× done first]
= 4 – 15 + 15 [+ done second]
= 4 – 0 [+ done third]
= 4 [- done last]

Question 7.
Observe the pattern and find the word by hiding the Numbers 1 H 2 0 3 W, 4 A 5 R 6 E, 7 Y 8 0 9 U.
Solution:
HOW ARE YOU

Question 8.
Arrange the following from the eldest to the youngest. What do you get?

Solution:
Arranging from eldest to the youngest we get
F – refers to grandparents
A – refers to parents
M – refers to an uncle
I – refers to elder sister
L – refers to me
Y – refers to the younger brother
So we get FAMILY

Challenge Problems

Question 9.
Prepare a daily time schedule for evening study at home.
Solution:
5.00 pm to 6.00 pm – Mathematics
6.0 pm to 7.00 pm – Science
7.0 pm to 8.00 pm – Social Science
8. pm to 9.00 pm – Dinner & Recreation
9. pm to 10.00 pm – Tamil and English

Question 10.
Observe the geometrical pattern and answer the following questions.

(i) Write down the number of sticks used in each iterative pattern,
(ii) Draw the next figure in the pattern also find the total number of sticks used in it.
Solution:
(i) 3, 9, 18

Question 11.
Find the HCF of 28, 35, 42 by Euclid’s game.
Solution:
HCF of 28, 35, 42
HCF of (28, 35 – 28, 42 – 28)
28 = 2 × 2 × 7
7 = 1 × 7
14 = 2 × 7
HCF of (28, 7, 14) = 7

Question 12.
Follow the given instructions to fill your name in the OMR sheet.
1. The name should be written in capital letters from left to right.
2. One alphabet is to be entered in each box.
3. If any empty boxes are there at the end they should be left blank.
4. Ballpoint pen is to be used for shading the bubbles for the corresponding alphabets.

Solution:
Do your self.

Question 13.
Consider the Postal index number (PIN) written on the letters as follows: 604506; 604516; 604560; 604506; 604516; 604516; 604560; 604516; 604505; 604470; 604515; 604520; 604303; 604509; 604470. How the letters can be sorted as per Postal Index Numbers?
Solution:
604 is common for all postal index numbers. Compare the remaining 3 digits, 303, 470, 505, 506 (two) 509, 510. 515, 516 (Four), 520, 560 (two).

Students can download Maths Chapter 5 Information Processing Ex 5.1 Questions and Answers, Notes, Samacheer Kalvi 6th Maths Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus, helps students complete homework assignments and to score high marks in board exams.

Tamilnadu Samacheer Kalvi 6th Maths Solutions Term 3 Chapter 5 Information Processing Ex 5.1

Question 1.
Study and complete the following pattern.
(i) 1 × 1 = 1
11 × 11 = 121
111 × 111 = 12321
1111 × 1111 = ?
11111 × 11111 = ?

Solution:
(i) 1234321, 123454321
(ii) 144, 60, 84, 36, 48, 15, 27

Question 2.
Find next three numbers in the following number patterns.
(i) 50, 51, 53, 56, 60……
(ii) 77, 69, 61, 53, ……
(iii) 10, 20, 40, 80,…
(iv) \(\frac{21}{33}\), \(\frac{321}{444}\), \(\frac{4321}{555}\)
Solution:

i) The pattern generating these numbers is
50, 50 + 1, 51 + 2, 53 + 3, 56 + 4, 60 + 5, 65 + 6, 71 + 7,
∴ 50, 51, 53, 56, 60, 65, 71, 78, ……
∴ The next three numbers will be 65, 71, 78

ii) The pattern generating these numbers is
77, 77 – 8, 69 – 8, 61 – 8, 53 – 8, 45 – 8, 37 – 8, 29
77, 69, 61, 53, 45, 37, 29, 21,
∴ The next three numbers will be 45, 37, 29.

iii) The pattern generating these numbers is
10, 10 + 10, 20 + 20, 40 + 40, 80 + 80, 160 + 160, 320 + 320,….
10, 20, 40, 80, 160, 320, 640,….
∴ The next three numbers will be 160, 320, 640.

(iv) \(\frac{54321}{66666}\), \(\frac{654321}{777777}\), \(\frac{7654321}{8888888}\)

Question 3.
Consider the Fibonacci sequence 1, 1, 2, 3, 5, 8, 13, 21, 34, 55,…. Observe and complete the following table by understanding the number patterns? followed. After filling the table discuss the pattern followed in addition and subtraction, of the numbers of the sequence?

Solution:
(i) 12, 13 – 1 = 12
(ii) 33, 34 – 1 = 33
(iii) 1 + 3 + 8 + 21 + 55 = 88, 89 – 1 = 88

Question 4.
Complete the following patterns.

Solution:

Question 5.
Find the HCF of the following pair of numbers by Euclid’s game
(i) 25 and 35
(ii) 36 and 12
(iii) 15 and 29
Solution:
(i) HCF of (25, 35 – 25)
25 = 5 × 5
10 = 2 × 5
HCF of (25, 10) = 5

(ii) HCF of (36, 36 – 12)
36 = 2 × 2 × 3 × 3
24 = 2 × 2 × 2 × 3
HCF of (36, 24) = 2 × 2 × 3 = 12

(iii) HCF of (15, 29 -15)
15 = 3 × 5 × 1
14 = 2 × 7 × 1
HCF of (15, 14) = 1

Question 6.
Find HCF of 48 and 28. Also find the HCF of 48 and the number obtained by finding their difference.
Solution:
HCF of 48 and 28
48 = 2 × 2 × 2 × 2 × 3
28 = 2 × 2 × 7
HCF of (48, 28) = 2 × 2 = 4
HCF of (48, 48 – 28)
48 = 2 × 2 × 2 × 2 × 3
20 = 2 × 2 × 5
HCF of (48, 20) = 4

Question 7.
Give instructions to fill in a bank withdrawal form issued in a bank.
Solution:

• The name should be written in capital letters from left to right.
• Write the date of withdrawal on the right top comer of the form.
• Write the amount (in words) to be withdrawn in the space provided.
• Write the amount (in figures) to be withdrawn in the box provided.
• Put your signature at the right bottom above the ‘signature of the depositor’.

Question 8.
Arrange the name of your classmates alphabetically.
Solution:

Question 9.
Follow and execute the instructions given below.

(i) Write the number 10 in the place common to the three figures
(ii) Write the number 5 in the place common for square and circle only.
(iii) Write the number 7 in the place common for triangle and circle only.
(iv) Write the number 2 in the place common for triangle and square only.
(v) Write the numbers 12, 14, and 8 only in square, circle, and triangle respectively.
Solution:

Question 10.
Fill in the following information

Solution:

Objective Type Questions

Question 11.
The next term in the sequence 15, 17, 20, 22, 25, … is
(a) 28
(b) 29
(c) 27
Hint:
Add 2 and 3 alternatively
Solution:
(c) 27

Question 12.
What will be the 25th letter in the pattern? ABCAABBCCAAABBBCCC,…
(a) B
(b) C
(c) D
(d) A
Solution:
(a) B

Question 13.
The difference between 6th term add 5th term in the Fibonacci sequence is ___.
(a) 6
(b) 8
(c) 5
(d) 3
Solution:
(d) 3

Question 14.
The 11th term in the Lucas sequence 1, 3, 4, 7, is
(a) 199
(b) 76
(c) 123
(d) 47
Solution:
(a) 199

Question 15.
If the Highest Common Factor of 26 and 54 is 2, then HCF of 54 and 28 is .
(a) 26
(b) 2
(c) 54
(d) 1
Hint: HCF (54, 28) = HCF (28, 26) = 2
Solution:
(b) 2

Students can download Maths Chapter 4 Symmetry Ex 4.2 Questions and Answers, Notes, Samacheer Kalvi 6th Maths Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus, helps students complete homework assignments and to score high marks in board exams.

Tamilnadu Samacheer Kalvi 6th Maths Solutions Term 3 Chapter 4 Symmetry Ex 4.2

Miscellaneous Practice Problems

Question 1.
Draw and answer the following.
(i) A triangle which has no line of symmetry.
(ii) A triangle which has only one line of symmetry
(iii) A triangle which has three lines of symmetry.
Solution:
(i) Scalene triangle
(ii) Isosceles triangle
(iii) Equilateral triangle

Question 2.
Find the alphabets in the box which have

(i) No line of symmetry
(ii) Rotational symmetry
(iii) Reflection symmetry
(iv) Reflection and rotational symmetry.
Solution:
i) The alphabets which have no line of symmetry are P, N, S, Z
ii) The alphabets which have Rotational symmetry are I, O, N, X, S, H, Z
iii) The alphabets which have reflection symmetry are A, M, E, D, I, K, O, X, H, U, V, W.
iv) The alphabets which has reflection and rotational symmetry are I, O, X, H.

Question 3.
For the following pictures, find the number of lines of symmetry and also find the order of rotation.

Solution:
(i) 0, 2
(ii) 1, 0
(iii) 2, 2
(iv) 8, 8
(v) 1, 0

Question 4.
The three-digit number 101 has rotational and reflection symmetry. Give five more examples of three-digit numbers that have both rotational and reflection symmetry
Solution:
The digits 0, 1, 8 have rotational and reflection symmetry.
∴ The three digits numbers 181, 111, 808, 818, 888 have both rotational and reflection symmetry.

Question 5.
Translate the given pattern and complete the design in a rectangular strips?

Solution:

Challenge Problems

Question 6.
Shade one square so that it possesses

(i) One line of symmetry
(ii) Rotational symmetry of order 2
Solution:

Question 7.
Join six identical squares so that atleast one side of a square fits exactly with any other side of the square and has reflection symmetry (any three ways).
Solution:

Question 8.
Draw the following
(i) A figure which has reflection symmetry but no rotational symmetry.
(ii) A figure which has rotational symmetry but no reflection symmetry.
(iii) A figure which has both reflection and rotational symmetry.
Solution:

Question 9.
Find the line of symmetry and the order of rotational symmetry’ of the given regular polygons and complete the following table and answer the questions given below.

i) A regular polygon of 10 sides will have ______ lines of symmetry.
ii) If a regular polygon has 10 lines of symmetry then its order of rotational symmetry is ______
iii) A regular polygon of ‘n’ sides has lines of symmetry and the order of rotational symmetry is ______
Solution:
(i) 10
(ii) 10
(iii) n, n

Question 10.
Colour the boxes in such a way that it possesses translation symmetry.

Solution:

Students can download Maths Chapter 4 Symmetry Ex 4.1 Questions and Answers, Notes, Samacheer Kalvi 6th Maths Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus, helps students complete homework assignments and to score high marks in board exams.

Tamilnadu Samacheer Kalvi 6th Maths Solutions Term 3 Chapter 4 Symmetry Ex 4.1

Question 1.
Fill in the blanks
(i) The reflected image of the letter ‘q’ is …….
(ii) A rhombus has ………… lines of symmetry.
(iii) The order of rotational symmetry of the letter ‘Z’ is ……….
(iv) A figure is said to have rotational symmetry, if the order of rotation is atleast ……….
(v) ……… symmetry occurs when an object slides to new position.
Solution:
(i) P
(ii) two
(iii) 2
(iv) two
(v) Translation

Question 2.
Say True or False
(i) A rectangle has four lines of symmetry.
(ii) A shape has reflection symmetry if it has a line of symmetry.
(iii) The reflection of the name RANI is INAЯ.
(iv) Order of rotation of a circle is infinite.
(v) The number 191 has rotational symmetry.
Solution:
(i) False
(ii) True
(iii) False
(iv) True
(v) False

Question 3.
Match the following shapes with their number of lines of symmetry.

Solution:
(i) d
(ii) a
(iii) b
(iv) c

Question 4.
Draw the lines of symmetry of the following.

Solution:

Question 5.
Using the given horizontal line/ vertical line as a line of symmetry, complete each alphabet to discover the hidden word.

Solution:
(i) DECODE
(ii) KICK
(iii) BED
(iv) WAY
(v) MATY
(vi) TOMATO

Question 6.
Draw a line of symmetry of the given figures such that one hole coincides with the other hole(s) to make pairs.

Solution:

Question 7.
Complete the other half of the following figures such that the dotted line is the line of symmetry.

Solution:

Question 8.
Find the order of rotation for each of the following.

Solution:
(i) 2
(ii) 2
(iii) 4
(iv) 8
(v) 2

Question 9.
A standard die has six faces which are shown below. Find the order of rotational symmetry of each face of a die?

Solution:
(i) 4
(ii) 2
(iii) 2
(iv) 4
(v) 4
(vi) 2

Question 10.
What pattern is translated in the given border kolams?

Solution:

Objective Type Questions

Question 11.
Which of the following letter does not have a line of symmetry?
(a) A
(b) P
(c) T
(d) U
Hint: A, T, U have one line of symmetry
Solution:
(b) P

Question 12.
Which of the following is a symmetrical figure?

Solution:
(c)

Question 13.
Which word has a vertical line of symmetry?
(a) DAD
(b) NUN
(c) MAM
(d) EVE
Hint: D, N, E have no vertical line of symmetry
Solution:
D, N, E have no vertical line of symmetry

Question 14.
The order of rotational symmetry of 818 is ………
(a) 1
(b) 2
(c) 3
(d) 4
Solution:
(b) 2

Question 15.
The order of rotational symmetry ★ is ___
(a) 5
(b) 6
(c) 7
(d) 8
Solution:
(a) 5