1. Which layer of the atmosphere is closest to the Earth

A) Stratosphere

B) Troposphere

C) Mesosphere

D) Thermosphere

2. In which layer do most weather changes occur

A) Exosphere

B) Thermosphere

C) Mesosphere

D) Troposphere

3. Which gas is highest in percentage in the atmosphere

A) Oxygen

B) Carbon dioxide

C) Nitrogen

D) Argon

4. Which gas is most important for breathing

A) Nitrogen

B) Oxygen

C) Helium

D) Hydrogen

5. The ozone layer is found mainly in

A) Stratosphere

B) Troposphere

C) Mesosphere

D) Exosphere

6. What is the main work of the ozone layer

A) Brings rainfall

B) Makes wind

C) Forms clouds

D) Stops UV rays

7. Which layer lies above the stratosphere

A) Troposphere

B) Mesosphere

C) Exosphere

D) Ionosphere

8. Meteors usually burn in which layer

A) Troposphere

B) Stratosphere

C) Mesosphere

D) Exosphere

9. Which is the coldest layer of the atmosphere

A) Troposphere

B) Thermosphere

C) Stratosphere

D) Mesosphere

10. Which layer is known for radio communication

A) Ionosphere

B) Troposphere

C) Mesosphere

D) Ozone sphere

11. The ionosphere is part of

A) Troposphere

B) Mesosphere

C) Thermosphere

D) Stratosphere

12. Which is the uppermost layer of the atmosphere

A) Troposphere

B) Exosphere

C) Stratosphere

D) Mesosphere

13. Air pressure is highest at

A) High mountains

B) Sea level

C) Upper atmosphere

D) Sea level

14. As altitude increases, air pressure

A) Increases

B) Decreases

C) Remains same

D) First rises then falls

15. Which instrument measures air pressure

A) Barometer

B) Thermometer

C) Hygrometer

D) Rain gauge

16. Which instrument measures humidity

A) Barometer

B) Anemometer

C) Seismograph

D) Hygrometer

17. Which instrument measures wind speed

A) Thermometer

B) Hygrometer

C) Anemometer

D) Altimeter

18. The movement of air from high pressure to low pressure is called

A) Humidity

B) Wind

C) Rainfall

D) Fog

19. What is humidity

A) Amount of heat in air

B) Speed of wind

C) Weight of clouds

D) Amount of water vapour in air

20. Clouds are formed due to

A) Evaporation only

B) Earthquake

C) Condensation of water vapour

D) Sunspots

21. Which process changes water vapour into water droplets

A) Evaporation

B) Condensation

C) Sublimation

D) Radiation

22. Rainfall caused by rising hot air is called

A) Cyclonic rainfall

B) Relief rainfall

C) Winter rainfall

D) Convectional rainfall

23. Rainfall caused by mountains is called

A) Relief rainfall

B) Convectional rainfall

C) Cyclonic rainfall

D) Artificial rainfall

24. Which gas is mainly responsible for global warming

A) Oxygen

B) Nitrogen

C) Carbon dioxide

D) Neon

25. Which layer protects Earth from harmful ultraviolet rays

A) Mantle

B) Ozone layer

C) Core

D) Hydrosphere

26. Which condition causes fog

A) Very dry air

B) Dust storm only

C) High pressure only

D) Condensation near ground

27. Which of the following is a greenhouse gas

A) Oxygen

B) Nitrogen

C) Carbon dioxide

D) Helium

28. The boundary between troposphere and stratosphere is called

A) Mesopause

B) Tropopause

C) Stratopause

D) Ionosphere

29. Jet aircraft usually fly in

A) Stratosphere

B) Troposphere

C) Mesosphere

D) Exosphere

30. The atmosphere around the Earth is held by

A) Magnetism only

B) Wind force

C) Sunlight

D) Gravity