Environmental Issues (Global Warming, Pollution) MCQs

1. Which gas is the primary contributor to global warming?
(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Helium

2. The depletion of the ozone layer is mainly caused by:
(A) Carbon dioxide
(B) Chlorofluorocarbons (CFCs)
(C) Methane
(D) Sulfur dioxide

3. Which of the following is NOT a greenhouse gas?
(A) Methane
(B) Water vapor
(C) Oxygen
(D) Nitrous oxide

4. Which type of pollution is caused by excessive noise?
(A) Air pollution
(B) Water pollution
(C) Noise pollution
(D) Land pollution

5. Which international agreement aims to reduce global carbon emissions?
(A) Kyoto Protocol
(B) Montreal Protocol
(C) Paris Agreement
(D) Basel Convention

6. Acid rain is caused by the presence of:
(A) Oxygen and nitrogen
(B) Sulfur dioxide and nitrogen oxides
(C) Carbon monoxide and helium
(D) Chlorine and hydrogen

7. Which type of pollution affects marine life the most?
(A) Air pollution
(B) Water pollution
(C) Soil pollution
(D) Noise pollution

8. The main cause of deforestation is:
(A) Industrial pollution
(B) Urbanization and agriculture
(C) Excessive rainfall
(D) Soil erosion

9. Which of the following is a renewable energy source?
(A) Coal
(B) Petroleum
(C) Solar energy
(D) Natural gas

10. Which pollutant is mainly responsible for smog?
(A) Ozone
(B) Carbon monoxide
(C) Sulfur dioxide
(D) Particulate matter

11. What is the main cause of global warming?
(A) Increased oxygen levels
(B) Deforestation and burning of fossil fuels
(C) Excessive rainfall
(D) Decrease in carbon dioxide levels

12. Which energy source is the least harmful to the environment?
(A) Coal
(B) Nuclear energy
(C) Wind energy
(D) Natural gas

13. What does “carbon footprint” measure?
(A) The amount of oxygen released by trees
(B) The total greenhouse gases emitted by an individual or organization
(C) The number of carbon atoms in the air
(D) The depth of carbon deposits in soil

14. Which environmental issue is linked to excessive use of plastic?
(A) Air pollution
(B) Water pollution
(C) Noise pollution
(D) Radiation pollution

15. What is the main effect of deforestation?
(A) Increase in oxygen levels
(B) Loss of biodiversity and increased carbon dioxide levels
(C) Decrease in global temperature
(D) Increased soil fertility

16. Which country is the largest emitter of carbon dioxide?
(A) India
(B) USA
(C) China
(D) Russia

17. What is an alternative to plastic bags to reduce pollution?
(A) Paper bags
(B) Polythene bags
(C) Metal bags
(D) None of the above

18. The Great Pacific Garbage Patch is mostly made of:
(A) Glass waste
(B) Plastic waste
(C) Metal waste
(D) Radioactive waste

19. Which human activity contributes the most to deforestation?
(A) Fishing
(B) Mining
(C) Agriculture and logging
(D) Tourism

20. What is the most effective way to reduce air pollution?
(A) Planting more trees
(B) Increasing the use of coal
(C) Using more private cars
(D) Burning more fossil fuels