1. The depletion of the ozone layer is caused by:
a. Carbon dioxide
b. Nitrous oxide
c. Methane
d. Chlorofluorocarbons
Answer: d. Chlorofluorocarbons
2. Montreal protocol is related to:
a. Global warming
b. Ozone depletion
c. Climatic changes
d. Biodiversity hotspot
Answer: b. Ozone depletion
3. Who discovered the ozone layer? Hint: discovered in 1913
a. Henry and Charles
b. Carl and Charles
c. G. M.B Dobson
d. Carl Sagan
Answer: a. Henry and Charles
4. Which of the following UV radiations is responsible for causing sunburns and skin cancer?
a. UV-A
b. UV-B
c. UB-C
d. None of these
Answer: b. UV-B
5. Who discovered that chlorofluorocarbons (CFCs) could deplete Earth’s atmospheric ozone layer?
a. Rowland and Molina
b. Henry and Marty
c. Henry and Charles
d. Charles Babbage
Answer: a. Rowland and Molina
6. CFCs are widely used in…?
a. Coolants in refrigeration
b. Solvents in cleaners
c. Air conditioners
d. All of these
Answer: d. All of these
7. The pollutants chlorofluorocarbons are the major source of air pollution contributed by:
a. Aerosols
b. Sewage pollutants
c. Industrial effluents
d. None of these
Answer: a. Aerosols
Recommended: Chlorofluorocarbons CFCs Practice Test
8. Which country banned the production and sale of industrial refrigerants using CFCs in 2005?
a. USA
b. UK
c. UAE
d. China
Answer: d. China
9. Which of the following is used as a substitute for CFCs?
a. Solar panels
b. Kerosene
c. HFCs
d. None of these
Answer: c. HFCs
10. How many chlorine atoms are attached to a single carbon atom in Chlorofluorocarbons?
a. 1
b. 3
c. 2
d. 4
Answer: c. 2
11. An important product in the ozone depletion by chlorofluorocarbons is:
a. OCL
b. CL2
c. OF2
d. O2F2
Answer: a. OCL
12. Choose the correct statement regarding chlorofluorocarbons:
a. Chlorofluorocarbons are used as refrigerants
b. Chlorofluorocarbons are used as fuel for air crafts
c. Chlorofluorocarbons are used as repairers of the ozone layer
d. Chlorofluorocarbons are used as repairers of the troposphere
Answer: a. Chlorofluorocarbons are used as refrigerants
13. The pollutants released by jet airplanes in the atmosphere as chlorofluorocarbons are known as:
a. Photochemical oxidants
b. Aerosols
c. Physical pollutants
d. Photochemical reductants
Answer: b. Aerosols
14. In which year the first ozone hole was discovered?
a. 1990
b. 1985
c. 1950
d. 1965
Answer: b. 1985
15. The Montreal Protocol finalized in 1987; is a global agreement to protect:
a. Food chain
b. Ozone layer depletion
c. Global warming
d. Wild animals
Answer: b. Ozone layer depletion
16. The ozone layer depletion is found in which sphere?
a. Ionosphere
b. Lithosphere
c. Stratosphere
d. Troposphere
Answer: c. Stratosphere
17. The International Day for the Preservation of the Ozone Layer is:
a. 10 September
b. 16 December
c. 16 September
d. 12 September
Answer: c. 16 September
18. Chlorofluorocarbons are not being used in refrigerators because they:
a. Increase temperature
b. Cause allergic reactions
c. Deplete ozone layer
d. None of these
Answer: c. Deplete ozone layer
19. Name the CFC that is used in refrigerators?
a. Carbon dioxide
b. Methane
c. Ammonia
d. Freon
Answer: d. Freon
20. Chlorofluorocarbons (CFCs) consists of:
a. Cesium, fluoride, carbon
b. Chlorine, fluorine, cesium
c. Chlorine, fluoride, carbon
d. Chlorine, fluorine, carbon
Answer: d. Chlorine, fluorine, carbon
