Air, its composition, and pollution MCQs in Everyday Science

By: Prof. Dr. Fazal Rehman | Last updated: May 15, 2025

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1. : What are the main components of Earth’s atmosphere?



2. : What is the approximate percentage of nitrogen in Earth’s atmosphere?



3. : Which gas is the most abundant in the Earth’s atmosphere?



4. : What is the term for the increase in Earth’s average surface temperature due to rising levels of greenhouse gases?



5. : What is the primary source of carbon dioxide in the atmosphere?



6. : Which gas in the atmosphere is responsible for the formation of acid rain?



7. : What is the term for the layer of the atmosphere that contains the ozone layer?



8. : Which of the following is a greenhouse gas?



9. : What is the primary cause of the thinning of the ozone layer?



10. : What is the term for a mixture of air pollutants that reduces visibility?



11. : Which gas is commonly used in refrigeration and is known to contribute to ozone depletion?



12. : What is the term for the phenomenon where urban areas experience higher temperatures than their rural surroundings?



13. : Which pollutant is primarily produced by motor vehicles and contributes to air pollution?



14. : What is the term for the harmful effects of pollutants on human health and the environment?



15. : Which of the following pollutants is a major contributor to respiratory problems in humans?



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