1. : Which layer of the atmosphere contains the ozone layer?
(A) Troposphere
(B) Mesosphere
(C) Thermosphere
(D) Stratosphere
2. : Which gas makes up the largest proportion of Earth’s atmosphere?
(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Argon
3. : The boundary between the troposphere and stratosphere is called the:
(A) Tropopause
(B) Stratopause
(C) Mesopause
(D) Thermopause
4. : Which instrument is used to measure atmospheric pressure?
(A) Hygrometer
(B) Thermometer
(C) Barometer
(D) Anemometer
5. : Which layer of the atmosphere is responsible for auroras?
(A) Mesosphere
(B) Thermosphere
(C) Stratosphere
(D) Troposphere
6. : Which gas is primarily responsible for the greenhouse effect?
(A) Carbon dioxide
(B) Oxygen
(C) Argon
(D) Helium
7. : The region where weather phenomena mainly occur is the:
(A) Exosphere
(B) Troposphere
(C) Mesosphere
(D) Thermosphere
8. : Which type of cloud is associated with thunderstorms?
(A) Cirrus
(B) Stratus
(C) Cumulonimbus
(D) Altostratus
9. : The jet streams are found in which part of the atmosphere?
(A) Stratosphere
(B) Mesosphere
(C) Exosphere
(D) Troposphere
10. : Which instrument is used to measure humidity?
(A) Thermometer
(B) Hygrometer
(C) Anemometer
(D) Pyranometer
11. : Which gas filters harmful ultraviolet rays in the atmosphere?
(A) Nitrogen
(B) Oxygen
(C) Ozone
(D) Carbon dioxide
12. : Which layer of the atmosphere protects Earth from meteors?
(A) Mesosphere
(B) Stratosphere
(C) Troposphere
(D) Thermosphere
13. : The coldest layer of the atmosphere is the:
(A) Stratosphere
(B) Mesosphere
(C) Troposphere
(D) Thermosphere
14. : Which instrument is used to measure wind speed?
(A) Anemometer
(B) Barometer
(C) Hygrometer
(D) Thermometer
15. : Which gas is a major component of smog?
(A) Nitrogen
(B) Ozone
(C) Argon
(D) Helium
16. : The phenomenon of scattering of light in the atmosphere explains why:
(A) The sky is blue
(B) The Sun is hot
(C) Rainbows form
(D) The Earth rotates
17. : The ionosphere is important because it:
(A) Produces rainfall
(B) Reflects radio waves
(C) Absorbs oxygen
(D) Blocks gravity
18. : Which is the most abundant greenhouse gas?
(A) Carbon dioxide
(B) Water vapor
(C) Methane
(D) Nitrous oxide
19. : Which phenomenon causes the deflection of winds on Earth?
(A) Jet streams
(B) Coriolis effect
(C) Tidal waves
(D) Aurora
20. : Which layer is directly above the stratosphere?
(A) Exosphere
(B) Mesosphere
(C) Troposphere
(D) Thermosphere
21. : Acid rain is mainly caused by the emission of:
(A) Nitrogen and oxygen
(B) Sulfur dioxide and nitrogen oxides
(C) Carbon dioxide and methane
(D) Helium and argon
22. : Which part of the atmosphere is used for weather forecasting with balloons?
(A) Stratosphere
(B) Exosphere
(C) Mesosphere
(D) Thermosphere
23. : Which gas has the highest global warming potential?
(A) Nitrous oxide
(B) Methane
(C) Carbon dioxide
(D) Chlorofluorocarbons (CFCs)
24. : What percentage of Earth’s atmosphere is oxygen?
(A) 78%
(B) 21%
(C) 10%
(D) 1%
25. : Which process describes the upward movement of warm air and downward movement of cool air?
(A) Radiation
(B) Conduction
(C) Convection
(D) Reflection
26. : Which gas in the atmosphere is used in photosynthesis?
(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Ozone
27. : The main cause of global warming is the increase of which gas?
(A) Methane
(B) Carbon dioxide
(C) Nitrogen
(D) Argon
28. : Which phenomenon causes temperature inversion in the atmosphere?
(A) Air pollution
(B) Rapid cooling of Earth’s surface
(C) Volcanoes
(D) Lightning
29. : Which cloud type appears wispy and feathery?
(A) Stratus
(B) Cumulus
(C) Cirrus
(D) Nimbus
30. : Which atmospheric layer contains the weather satellites?
(A) Troposphere
(B) Mesosphere
(C) Thermosphere
(D) Stratosphere
31. : What is the approximate thickness of the troposphere at the equator?
(A) 5 km
(B) 10 km
(C) 16 km
(D) 25 km
32. : The greenhouse effect keeps Earth’s average surface temperature around:
(A) –18°C
(B) 15°C
(C) 30°C
(D) 50°C
33. : Which gas causes depletion of the ozone layer?
(A) Carbon monoxide
(B) Chlorofluorocarbons
(C) Nitrogen
(D) Argon
34. : Which term describes the long-term average weather conditions of a region?
(A) Weather
(B) Climate
(C) Forecast
(D) Pressure
35. : Which layer of the atmosphere is the hottest?
(A) Troposphere
(B) Stratosphere
(C) Mesosphere
(D) Thermosphere
36. : Which atmospheric layer merges into outer space?
(A) Exosphere
(B) Stratosphere
(C) Mesosphere
(D) Troposphere
37. : Which element is most abundant in Earth’s atmosphere?
(A) Oxygen
(B) Nitrogen
(C) Argon
(D) Carbon dioxide
38. : Which is a secondary air pollutant?
(A) Ozone at ground level
(B) Sulfur dioxide
(C) Carbon monoxide
(D) Methane
39. : The trade winds blow from which direction in the tropics?
(A) East to west
(B) West to east
(C) North to south
(D) South to north
40. : Which process in the atmosphere causes rain formation?
(A) Sublimation
(B) Condensation
(C) Evaporation
(D) Radiation
41. : Which instrument is used to measure solar radiation?
(A) Anemometer
(B) Pyranometer
(C) Hygrometer
(D) Barometer
42. : Which type of rainfall occurs when moist air rises over mountains?
(A) Convectional rainfall
(B) Orographic rainfall
(C) Cyclonic rainfall
(D) Acid rainfall
43. : The unit of atmospheric pressure is:
(A) Pascal
(B) Joule
(C) Watt
(D) Volt
44. : Which phenomenon causes the twinkling of stars?
(A) Reflection
(B) Refraction of light in the atmosphere
(C) Dispersion
(D) Diffraction
45. : The D-layer of the ionosphere mainly absorbs:
(A) UV radiation
(B) Radio waves
(C) Infrared radiation
(D) X-rays
46. : Which circulation describes large-scale movement of air due to uneven heating?
(A) Local winds
(B) Global circulation
(C) Jet streams
(D) Tornadoes
47. : Which layer of atmosphere is used for commercial flights?
(A) Stratosphere
(B) Troposphere
(C) Mesosphere
(D) Thermosphere
48. : The “hole” in the ozone layer is most prominent over:
(A) Arctic region
(B) Antarctic region
(C) North America
(D) Europe
49. : Which phenomenon occurs due to reflection of sound waves in the atmosphere?
(A) Thunder
(B) Echo
(C) Lightning
(D) Cyclone
50. : Which type of cloud is known as “fair weather clouds”?
(A) Cirrus
(B) Cumulus
(C) Stratus
(D) Nimbus