Revision Work | Science Voyage 3 | CLASS – III (SCIENCE)

 CLASS – III (SCIENCE)

Revision Work | Science Voyage 3

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REVISION WORK – 1

Topic: Chapter – 10

A. Fill in the Blanks

1. Fireflies are luminous insects.

2. Pushing a pencil box on a carpet involves more friction.

3. Sounds of birds are an example of pleasant sounds.

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B. Choose the Correct Answer

1. When the friction is less, things –
   a) Do not move
   b) Slide ✅
   c) Jump

2. Shadows can be –
   a) Longer than the object
   b) Shorter than the object
   c) Both a and b ✅

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C. Give Examples

• Soft sound – Whispering

• Loud sound – Beating drum

• Pleasant sound – Piano

• Unpleasant sound – Loudspeakers

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D. Short Question Answer

1. Mention the three features of force.

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REVISION WORK – 2

Topic: Chapter – 10

A. One Word Answers

1. How many minutes does sunlight take to reach Earth from the Sun?
   Ans.: 8 minutes

2. Which animal can make the loudest sound underwater?
   Ans.: Blue Whale

3. What is the short loud sound made by vehicles called?
   Ans.: Honking

4. What is the harmful effect of something called?
   Ans.: Pollution

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B. One Sentence Answers

1. Name two objects that allow light to pass through them.
   Ans.: Glass and water allow light to pass through them.

2. Define friction.
   Ans.: Friction is a special force that slows down a moving object.

3. What happens when there is less friction and more friction?
   Ans.: When there is less friction, things tend to slide. When there is more friction, things do not move easily.

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C. Concept Map

Light

• Luminous Example: Sun

• Non-luminous Example: Moon

• Light travels in a straight line

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REVISION WORK – 3

Topic: Chapter – 10

A. Broad Question Answer

1. How is a shadow formed? Mention any three features of shadow.

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B. True / False

1. Light helps us to see the objects around us. — True

2. Light travels very slowly. — False

3. The Sun is the biggest source of heat and light on Earth. — True

4. Noise pollution is good for our health. — False

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C. Draw, Label & Colour

1. Shadow formation at different times of the day (Page #90)

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REVISION WORK – 4

Topic: Chapter – 11

A. Fill in the Blanks

1. Petrol is measured in litres.

2. Cubit is a non-standard unit of measurement of length.

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B. Choose the Correct Answer

1. To measure mass, we use a –
   a) Weighing balance ✅
   b) Mug
   c) Clock

2. Which of the following measures temperature?
   a) Ruler
   b) Measuring rod
   c) Thermometer ✅

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C. Concept Map – Measuring Instruments

Measurement	Instrument
Length	Ruler
Capacity	Measuring Cylinder
Mass	Weighing Balance
Time	Clock

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D. Broad Question Answer

1. Write a short note on Mt. Everest.

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REVISION WORK – 5

Topic: Chapter – 11

A. Short Question Answers

1. What is length? Write the units used to measure long and short lengths.

2. What is temperature? Name the device used to measure temperature. Mention the two temperature scales.

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B. Draw, Label & Colour

• Hand span

• Foot span

• Cubit

• Stride / Pace

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REVISION WORK – 6

Topic: Chapter – 11 & 12

A. True / False

1. Weather becomes cool after rain. — True

2. In the morning, the sun is overhead and the rays fall straight. — False

3. During cloudy days, the sun is blocked by clouds. — True

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B. One Word Answers

1. Which formula was used earlier to measure mountain height?
   Ans.: Mathematical

2. What is the height of Mt. Everest?
   Ans.: 8848 m

3. Normal human body temperature in Centigrade scale:
   Ans.: 37°C

4. Normal human body temperature in Fahrenheit scale:
   Ans.: 98.6°F

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C. Match the Following

Column A	Column B
Ice	Freezing
Water vapour	Evaporation
Slow and gentle wind	Breeze
Thunder	Storm
Slanting sun rays	Morning

Answers:
1 → b
2 → c
3 → d
4 → a
5 → e

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REVISION WORK – 7

Topic: Chapter – 12

A. Choose the Correct Answer

1. In the morning, the sun rays are –
   a) Straight
   b) Slanting ✅
   c) Hidden

2. When ice converts into water, it is called –
   a) Melting ✅
   b) Freezing
   c) Boiling

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B. Fill in the Blanks

1. The continuous cycle of evaporation, condensation, and precipitation is known as the water cycle.

2. When clouds become too heavy and droplets fall as rain or snow, it is called precipitation.

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C. Short Question Answers

1. How does weather affect our clothing?

2. How does weather affect our food habits?

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REVISION WORK – 8

Topic: Chapter – 12

A. Complete the Concept Map

Season	Feature
Summer	Most of the time is hot
Monsoon	Most days are cloudy and rainy
Autumn	Dry for most of the day
Winter	Most days are cold
Spring	Season of flowers

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B. One Sentence Answers

1. Define hydropower.
   Ans.: Water used to generate electricity is known as hydropower.

2. What does air contain?
   Ans.: Air contains oxygen, carbon dioxide, nitrogen, dust particles, germs, smoke, and water vapour.

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C. Broad Question Answer

1. What is a storm? What are the effects of a storm?