Chapter 15
Air Around Us
1.What did all living things require ?
a) Trees
b) Air
c) Home
Answer: b) Air
2. What is moving air called?
a) storm
b) lightning
c) Air
Answer: c) Air
3. What gas helps to ignite a fire?
a) Methane
b) Carbon dioxide
c) Oxygen
Answer: c) Oxygen
4. What is the atmosphere that surrounds the Earth’s surface called?
a) The atmosphere
b) air
c) Air particles
Answer: a) The atmosphere
5. The What is the air component used by green plants to prepare their food?
a) air
b) Oxygen
c) Carbon dioxide
Answer: c) Carbon dioxide
6. For what century did people think that air was just a mixture of gases?
a) neither
b) to the eighteenth century
c) to the eighth century
Answer: b) to the eighteenth century
7. What is the English form of the word ‘smoke’?
a) Air
b) Smoke
c) Atmosphere
Answer: b) Smoke
8. When air comes in contact with a surface it condenses ?
a) hot
b) cool
c) Moderately hot
Answer: b) cool
9. About how much space in the air does nitrogen occupy?
a) 1/2
b) 7/9
c) 4/5
Answer: c) 4/5
10. What is in the smoke?
a) Fine dust particles
b) Gas
c) Both of the above
Answer: c) Both of the above
11. It is always in the air.
a) The dust particles
b) smoke
c) neither
Answer: a) The dust particles
12. It’s always in the air.
a) smoke
b) dust
c) None at all
Answer: b) dust
13. What do we take the air with when we breathe?
a) With mouth
b) with ears
c) with a nostrils
Answer: c) with a nostrils
14. Without what can animals not survive?
a) Plants
b) people
c) Option 3
Answer: a) Plants
15. What is the English form of the word ‘Air Attachment’?
a) Oxygen
b) air
c) Composition of air
Answer: c) Composition of air
16. If there is an empty bottle, can you tell what is inside the bottle?
a) air
b) water
c) It’s nothing
Answer: a) air
17. What has been revealed through the image below?
a) Different types of sparkles
b) Having oxygen in the air
c) Wind direction indicator device
Answer: c) Wind direction indicator device
18. What is the English form of the word ‘Windmill’?
a) Atmosphere
b) Windmill
c) Composition of air
Answer: b) Windmill
19. What is the gas required for living beings?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
Answer: a) Oxygen
20. What gases do plants take in in their breath?
a) Nitrogen
b) Carbon dioxide
c) Oxygen
Answer: c) Oxygen