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11 questions
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- 1. Multiple Choice
What is the percentage of Nitrogen in air?
72%
75%
78%
79%
- 2. Multiple Choice
Where is oxygen present?
Wind
Water
Soil
All of the above
- 3. Multiple Choice
Which gas is needed for respiration?
Nitrogen
Oxygen
Carbon Dioxide
Hydrogen
- 4. Multiple Choice
Which gas is released during photosynthesis?
Carbon Dioxide
Nitrogen
Oxygen
None of the above
- 5. Fill in the Blank
The layer of air around the Earth is called the _______. (write the answer in all lowercase)
- 6. Multiple Choice
People wear masks to protect their face from?
Smoke
Dust
Germs
All of the above
- 7. Multiple Choice
What is required for photosynthesis?
Sunlight
Heat
Water vapor
Oxygen
- 8. Multiple Choice
What do animals exhale?
Carbon Dioxide
Oxygen
Nitrogen
None of the above
- 9. Multiple Choice
What is the lightest gas on Earth’s atmosphere?
Helium
Hydrogen
Oxygen
Carbon Dioxide
- 10. Multiple Choice
What gas is present in balloons?
Carbon Dioxide
Hydrogen
Oxygen
Helium
- 11. Multiple Choice
What is a major part of air which doesn’t support a burning candle?
Nitrogen
Oxygen
Helium
None of the above
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