1. What are the main components of Earth’s atmosphere?
a) Oxygen and carbon dioxide
b) Nitrogen and oxygen
c) Hydrogen and helium
d) Argon and neon
Answer: b) Nitrogen and oxygen
2. What is the approximate percentage of nitrogen in Earth’s atmosphere?
a) 21%
b) 78%
c) 50%
d) 10%
Answer: b) 78%
3. Which gas is the most abundant in the Earth’s atmosphere?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Argon
Answer: c) Nitrogen
4. What is the term for the increase in Earth’s average surface temperature due to rising levels of greenhouse gases?
a) Ozone depletion
b) Acid rain
c) Global warming
d) Urban heat island
Answer: c) Global warming
5. What is the primary source of carbon dioxide in the atmosphere?
a) Volcanic eruptions
b) Respiration by plants
c) Combustion of fossil fuels
d) Oceanic evaporation
Answer: c) Combustion of fossil fuels
6. Which gas in the atmosphere is responsible for the formation of acid rain?
a) Methane
b) Nitrogen dioxide
c) Carbon monoxide
d) Ozone
Answer: b) Nitrogen dioxide
7. What is the term for the layer of the atmosphere that contains the ozone layer?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere
Answer: b) Stratosphere
8. Which of the following is a greenhouse gas?
a) Nitrogen
b) Argon
c) Carbon dioxide
d) Neon
Answer: c) Carbon dioxide
9. What is the primary cause of the thinning of the ozone layer?
a) Increased nitrogen levels
b) CFCs (chlorofluorocarbons)
c) Methane emissions
d) High levels of oxygen
Answer: b) CFCs (chlorofluorocarbons)
10. What is the term for a mixture of air pollutants that reduces visibility?
a) Smog
b) Fog
c) Mist
d) Haze
Answer: a) Smog
11. Which gas is commonly used in refrigeration and is known to contribute to ozone depletion?
a) Nitrogen
b) Carbon dioxide
c) Chlorofluorocarbons (CFCs)
d) Hydrogen
Answer: c) Chlorofluorocarbons (CFCs)
12. What is the term for the phenomenon where urban areas experience higher temperatures than their rural surroundings?
a) Greenhouse effect
b) Urban heat island effect
c) Temperature inversion
d) Thermal pollution
Answer: b) Urban heat island effect
13. Which pollutant is primarily produced by motor vehicles and contributes to air pollution?
a) Sulfur dioxide
b) Nitrogen oxides
c) Carbon dioxide
d) Ozone
Answer: b) Nitrogen oxides
14. What is the term for the harmful effects of pollutants on human health and the environment?
a) Environmental degradation
b) Air quality
c) Pollution
d) Greenhouse effect
Answer: c) Pollution
15. Which of the following pollutants is a major contributor to respiratory problems in humans?
a) Ozone
b) Methane
c) Nitrogen oxides
d) Carbon dioxide
Answer: c) Nitrogen oxides