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- 1. Multiple Choice
How much percentage of nitrogen is present in the air?
21%
4%
78%
33%
- 2. Multiple Choice
Which of these causes air pollution?
Throwing litter here and there
Smoke from factories
Both of these
None of these
- 3. Multiple Choice
_________ is the process by which oxygen reacts with a fuel and releases heat energy
Respiration
Oxygen cycle
None of these
Combustion
- 4. Fill in the Blank
Moving air is called?
- 5. Multiple Choice
A layer of air called __________ surrounds the earth.
Stratosphere
Troposphere
Atmosphere
- 6. Fill in the Blank
_________ is needed for respiration by living things
- 7. Multiple Choice
Water is present in the air in the form of ____________
Water vapor
Water cycle
Carbon-dioxide
Oxygen
- 8. Multiple Choice
The amount of water vapour present in the air is referred as humidity
True
False
- 9. Multiple Choice
Is carbon dioxide important for only animals?
Yes
No
- 10. Multiple Choice
A __________ is an instrument used to show the direction of the wind.
Pin wheel
Wind mill
Wind vane
Fan
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