Ozone Layer and Its Depletion MCQs

1. Where is the ozone layer located in the Earth’s atmosphere?
(A) Troposphere
(B) Stratosphere
(C) Mesosphere
(D) Thermosphere

2. Which gas is primarily responsible for ozone layer depletion?
(A) Carbon dioxide
(B) Sulfur dioxide
(C) Methane
(D) Chlorofluorocarbons (CFCs)

3. What is the function of the ozone layer?
(A) Produces oxygen
(B) Regulates rainfall
(C) Filters harmful UV radiation
(D) Maintains atmospheric pressure

4. Which type of ultraviolet radiation is most effectively absorbed by the ozone layer?
(A) UVA
(B) UVB
(C) UVC
(D) Infrared

5. Which international agreement aims to reduce the production of ozone-depleting substances?
(A) Paris Agreement
(B) Kyoto Protocol
(C) Montreal Protocol
(D) Geneva Convention

6. Which region is most affected by ozone layer depletion?
(A) Equator
(B) Arctic
(C) Tropics
(D) Antarctica

7. What is a major health effect of increased UV radiation due to ozone layer depletion?
(A) Diabetes
(B) Skin cancer
(C) High blood pressure
(D) Asthma

8. What is the role of CFCs in ozone depletion?
(A) Absorb UV rays
(B) Produce oxygen
(C) Release chlorine atoms that break ozone molecules
(D) Reduce carbon dioxide levels

9. What does O₃ represent in terms of chemical composition?
(A) Three oxygen atoms combined
(B) Oxygen with three electrons
(C) A compound of oxygen and nitrogen
(D) A radioactive oxygen isotope

10. How can individuals help protect the ozone layer?
(A) Use more aerosol sprays
(B) Use air conditioners with CFCs
(C) Avoid burning fossil fuels
(D) Use eco-friendly products and avoid ozone-depleting substances