ICSE Class 6 Chemistry - Air and Atmosphere - Test 5 (Comprehensive)
1. Why is air called a mixture?
A. It contains only oxygen
B. It is a single compound
C. It contains different gases
2. Which statement correctly describes the atmosphere?
A. It is the blanket of air around Earth
B. It is only the water in oceans
C. It is the solid land surface only
3. The major gas present in air is:
A. Oxygen
B. Nitrogen
C. Carbon dioxide
4. Which gas is needed for both breathing and burning?
A. Nitrogen
B. Carbon dioxide
C. Oxygen
5. Which gas helps to put out fire?
A. Carbon dioxide
B. Oxygen
C. Hydrogen
6. Green plants take in which gas from air to make food?
A. Nitrogen
B. Carbon dioxide
C. Smoke
7. Which gas is released by plants during photosynthesis?
A. Smoke
B. Dust
C. Oxygen
8. Droplets form outside a cold glass because air contains:
A. Water vapour
B. Sand grains
C. Iron pieces
9. Moving air is known as:
A. Fog
B. Wind
C. Smoke
10. A balloon expands when filled with air. This proves that air:
A. Has a fixed shape
B. Is not matter
C. Occupies space
11. An inflated balloon is heavier than an empty balloon because air has:
A. Mass
B. Bright colour
C. Sweet taste
12. Air pollution is caused by the presence of:
A. Clean oxygen only
B. Harmful substances in air
C. Fresh water only
13. Which of the following is a source of air pollution?
A. Planting trees
B. Walking to school
C. Smoke from vehicles
14. Which action helps to reduce air pollution?
A. Planting more trees
B. Burning garbage openly
C. Cutting all plants
15. The force exerted by air is called:
A. Air colour
B. Air pressure
C. Air taste
16. Warm air usually:
A. Becomes a hard solid
B. Stops moving completely
C. Expands and rises
17. When air cools, it generally:
A. Contracts
B. Turns into gold
C. Produces fire
18. A candle covered with a jar stops burning after some time mainly because:
A. Nitrogen starts burning
B. Oxygen becomes insufficient
C. Glass produces smoke
19. Why is polluted air harmful?
A. It contains only fresh oxygen
B. It is always pure
C. It may contain harmful gases and particles
20. Which statement best shows the importance of air?
A. Air supports life and many natural processes
B. Air is useful only for balloons
C. Air contains only one gas