The Environmental studies MCQ section provides the most important question and answer session in the environment and ecology section as a part of any competitive examination. These environmental studies MCQ are very important and provide a handy practice before any exam.
Ozone Layer MCQ-Environmental studies
1.  Ozone layer is above the earth crust at around?
(A)Â 50 kmÂ
(B)Â 300 km
(C)Â 2000 km
(D)Â 20 km
2. where is the ozone layer primly found?
(A) Troposphere
(B) Stratosphere
(C) Mesosphere
(D) IonosphereÂ
3.  Which is responsible for Ozone Hole?Â
(A) CO2
(B) SO2
(C) O2
(D) CFC
4. Which radiation is absorbed by ozone layer present in the atmosphere ?
(A) Infrared
(B) Visible
(C) UltravioletÂ
(D) Microwave
5. World Ozone day is celebrated on
(A) 16 September
(B) 21 AprilÂ
(C) 25 December
(D) 30 January
6. Ozone hole is caused by
(A) Acetylene
(B) Ethylene
(C) Chlorofluoro carbons
(D) Methane
7. Which one of the following gases is responsible for the decrement in the ozone layer?
(A) Nitrous oxide
(B) Chlorofluoro carbon
(C) Carbon dioxide
(D) Carbon mono-oxide
8. Which one of the following is not responsible for the depletion of ozone layer?
(A) CFC-12 used in refrigerators
(B) Methyl chloroform used as solvent
(C) HALON-1211 used in fire fighting
(D) Nitrous oxide
9. Among the following greenhouse gases, which does not cause ozone pollution in the troposphere?
(A) Methane
(B) Carbon mono-oxide
(C) Nitrogen oxides (NO)
(D) Water vapours
10. Formation of ozone hole is maximum over which of the following ?
(A) IndiaÂ
(B) Africa
(C) Antarctica
(D) Europe
11. Which gas is filled in refrigerators?
(A) AmmoniaÂ
(B) Mafron
(C) Methane
(D) Acetylene
12. Â Montreal Protocol is related toÂ
(A) White Lion
(B) Chlorofluoro carbon
(C) Water pollution
(D) Agriculture
13. Montreal Protocol is related to the protection of
(A) Greenhouse gases
(B) Acid rain
(C) Ozone layer
(D) Endangered species
14. In stratosphere, the level of ozone is naturally regulated by
(A) Nitrous oxide
(B) Nitrogen dioxide
(C) CFC
(D) Water vapours
15. Which one of the following teams of scientists first discovered ‘ozone hole’ over Antarctica?
(A) Russian team
(B) German team
(C) American team
(D) British team
16. Which is the lowest layer of the atmosphere ?
(A) StratosphereÂ
(B) Ozonosphere
(C) Ionosphere
(D) Troposphere
17. Which of the following is not true about chlorofluoro carbon?
(A) It is used as a refrigerant
(B) It is not responsible for greenhouse effect
(C) It is responsible for reducing ozone in the stratosphere
(D) It is inactive in lower atmosphere
18. Ozone layer in Atmosphere protects the biosphere from which of the harmful radiations
(A) Infrared rays
(B) Ultraviolet rays
(C) X-rays
(D) Gama rays
19. Why is ozone layer useful to humanity?
(A) It supplies oxygen to the atmosphere
(B) It prevents the Sun’s ultraviolet rays from reaching the Earth
(C) It controls the temperature of the Earth
(D) None of the above
20. Ozone Layer of the Atmosphere______?
(A) Produces rain
(B) Produces pollution
(C) Provides safety to life on earth from ultraviolet radiation
(D) Produces oxygen in the atmosphere
21. Harmful ultraviolet radiation coming from the sun can cause_______?
(A) Liver cancer
(B) Brain cancer
(C) Oral cancer
(D) Dermal cancer
22. Which gas is filled in refrigerators ?
(A) AmmoniaÂ
(B) Mafron
(C) Methane
(D) Acetylene
23. The formation of the ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole?Â
(A) Presence of prominent tropospheric turbulence and inflow of chlorofluoro carbons.
(B) Presence of prominent polar front and stratospheric clouds and inflow of chlorofluoro carbons.
(C) Absence of polar front and stratospheric clouds and inflow of methane and chlorofluoro carbons
(D) Increased temperature at polar region due to global warming
24. Who among the following had discovered ‘ozone halo’ over Tibetan Plateau in 2005?
(A) M. Molina
(B) Joseph Farman
(C) G.W. Kent Moore
(D) Marcus Rex
25. Which of the following is correctly matched?
(i) Ozone – Chlorofluorocarbon (CFC)
(ii) Acid rain – Nitric acid
(iii) Rocket fuel – Kerosene oil (RP1)
(iv) Green House – Carbon dioxide Effect
(A) Only (i)Â
(B) (i),(ii), & (iv)
(C) NoneÂ
(D) All of these
26. Which one of the following is associated with the issue of control and phasing out of the use of ozone depleting substances?
(A) Bretton Woods Conference
(B) Montreal Protocol
(C) Kyoto Protocol
(D) Nagoya Protocol
27. Which of the following is produced during the formation of photochemical smog?
(A) Hydrocarbons
(B) Nitrogen oxides
(C) Ozone
(D) Methane
28. Consider the following statements;
“Chlorofluoro carbons, known as ozone-depleting substances, are used”
1. In the production of plastic foams.
2. In the production of tubeless tyres.
3. In cleaning certain electronic components.
4. As pressurizing agents in aerosol cans.
Which of the statements(s) given above is/are correct?
(A) 1, 2 and 3Â
(B) Only 4
(C) 1, 3 and 4
(D) 1, 2, 3 and 4
29. Which of the following substances is/are ozone depleting?
1. Chlorofluoro carbons
2. Halans
3. Carbon tetrachloride
Select the correct answer from the codes given below.Â
(A) Only 1
(B) Only 1 and 2
(C) Only 1 and 3
(D) 1, 2 and 3
30. Consider the following statements:
Assertion (A):Â Ozone is essential for biotic life.
Reason (R): The ozone layer protects the earth’s surface from high energy radiation.
Select the correct answer from the code given below.
(A) Both (A) and (R) are true and (R) is the correct explanation of (A)
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
(C) (A) is true, but (R) is false
(D) (A) is false, but (R) is true
