ICSE Class 6 Chemistry - Air and Atmosphere - Test 1 (Basic)
1. Air is best described as a:
A. Pure compound
B. Mixture of gases
C. Solid substance
2. The layer of air around the Earth is called:
A. Atmosphere
B. Lithosphere
C. Hydrosphere
3. Which gas is present in the largest amount in air?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
4. Which gas do humans and animals need for breathing?
A. Nitrogen
B. Oxygen
C. Smoke
5. Which gas supports burning?
A. Oxygen
B. Nitrogen
C. Water vapour
6. Which gas is commonly used in fire extinguishers?
A. Hydrogen
B. Oxygen
C. Carbon dioxide
7. Which gas do green plants use to make food?
A. Oxygen
B. Carbon dioxide
C. Helium
8. Which component of air forms droplets on a cold glass?
A. Water vapour
B. Sand
C. Iron filings
9. Moving air is called:
A. Dust
B. Cloud
C. Wind
10. A balloon becomes bigger when air is blown into it because air:
A. Has no space
B. Occupies space
C. Is always solid
11. Air has:
A. Mass
B. No matter
C. Only light
12. Which of the following can make air dirty?
A. Clean oxygen
B. Fresh breeze
C. Smoke
13. Air pollution means:
A. Clean air around us
B. Harmful substances in air
C. Only oxygen in air
14. Which is a common source of air pollution?
A. Vehicle smoke
B. Clean rainwater
C. Fresh flowers
15. Why is the atmosphere important?
A. It removes all water from Earth
B. It makes all things heavy
C. It supports life on Earth
16. Air is usually:
A. Bright red
B. Colourless
C. Hard like stone
17. A burning candle covered with a jar goes out after some time because:
A. Oxygen becomes insufficient
B. Nitrogen starts burning
C. Glass melts into water
18. Which gas is present in air in a small amount?
A. Nitrogen
B. Oxygen
C. Carbon dioxide
19. Which solid particles may be present in air?
A. Glass balls
B. Dust particles
C. Steel rods
20. Which action helps keep air clean?
A. Planting trees
B. Burning plastic
C. Increasing smoke