Class 06 CH:-06 Air

1. Air is a:

a. Mixture
b. Metal
c. Liquid

2. The major gas in air is:

a. Nitrogen
b. Oxygen
c. Carbon dioxide

3. Percentage of oxygen in air is about:

a. 50%
b. 21%
c. 10%

4. Which gas is important for breathing?

a. Oxygen
b. Nitrogen
c. Helium

5. Plants take in:

a. Oxygen
b. Nitrogen
c. Carbon dioxide

6. Air occupies:

a. Space
b. No space
c. Half space

7. Air has:

a. No weight
b. Weight
c. Color

8. Which gas is used by plants to make food?

a. Carbon dioxide
b. Oxygen
c. Hydrogen

9. Which gas protects us from harmful rays of the sun?

a. Ozone
b. Nitrogen
c. Steam

10. Smoke pollutes:

a. Water
b. Air
c. Soil

11. Which of these is not a gas in air?

a. Dust
b. Oxygen
c. Nitrogen

12. Air pressure is highest:

a. At sea level
b. On mountains
c. In space

13. Wind is moving:

a. Water
b. Soil
c. Air

14. Which gas helps burning?

a. Oxygen
b. Nitrogen
c. Carbon dioxide

15. Which gas is used in filling balloons?

a. Helium
b. Oxygen
c. Carbon dioxide

16. Air becomes polluted due to:

a. Trees
b. Smoke
c. Rain

17. Oxygen is needed for:

a. Sleeping
b. Burning
c. Melting

18. Air contains water vapor called:

a. Steam
b. Humidity
c. Dust

19. Which of these increases air pollution?

a. Planting trees
b. Cutting trees
c. Rain

20. The layer of air around Earth is called:

a. Atmosphere
b. Biosphere
c. Hydrosphere

21. Air is important for:

a. Photosynthesis
b. Sleeping
c. Painting

22. Which gas is 78% of air?

a. Nitrogen
b. Oxygen
c. Carbon dioxide

23. Burning of fuels produces:

a. Clean air
b. Polluted air
c. Pure water

24. Air pressure is measured by:

a. Thermometer
b. Barometer
c. Speedometer

25. Which of these is NOT found in air?

a. Nitrogen
b. Rocks
c. Oxygen

26. Air becomes lighter when it is:

a. Hot
b. Cold
c. Frozen

27. Clouds are formed due to:

a. Condensation
b. Evaporation
c. Melting

28. A gentle wind is called:

a. Breeze
b. Storm
c. Hurricane

29. A very strong windstorm is called:

a. Breeze
b. Cyclone
c. Fog

30. Air helps in:

a. Flying kites
b. Sleeping
c. Eating

31. Smoke from factories contains:

a. Clean oxygen
b. Harmful gases
c. Pure nitrogen

32. Air contains small particles of:

a. Stars
b. Dust
c. Stones

33. Fresh air is:

a. Polluted air
b. Clean air
c. Heavy air

34. Air pressure decreases when we:

a. Go down
b. Go up mountains
c. Go underwater

35. Human beings exhale:

a. Oxygen
b. Carbon dioxide
c. Nitrogen

36. Plants release:

a. Smoke
b. Oxygen
c. Dust

37. Moving air is called:

a. Wind
b. Steam
c. Fog

38. Air helps in:

a. Burning
b. Painting
c. Sleeping

39. Which gas do animals need for respiration?

a. Carbon dioxide
b. Nitrogen
c. Oxygen

40. Clean air is important for:

a. Good health
b. Noise
c. Pollution