Ozone Layer – Old Year Questions

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1. Place where Ozone Layer is primarily found is –

(a) Troposphere
(b) Stratosphere
(c) Mesosphere
(d) Ionosphere

[U.P.P.C.S. (Pre) (Spl) 2008]


2. Ozone layer is above the earth’s crust around –

(a) 50 km.
(b) 300 km.
(c) 2000 km.
(d) 20 km.

[R.A.S./R.T.S.(Pre) 2012]


3. Which is the lowest layer of the Atmosphere?

(a) Stratosphere
(b) Ozonosphere
(c) Ionosphere
(d) Troposphere

[Uttarakhand P.C.S. (Pre) 2016]


4. Which of the following is not true about chlorofluorocarbon?

(a) It is used as a refrigerant.
(b) Is not responsible for the greenhouse effect
(c) It is responsible for reducing ozone in the stratosphere.
(d) It is inactive in the lower atmosphere

[U.P. Lower Sub. (Pre) 2004]


5. Which is responsible for Ozone Hole?

(a) CO2
(b) SO2
(c) O2
(d) CFC
(e) None of these

[Chhattisgarh P.C.S. (Pre) 2014]


6. The radiation that is absorbed by ozone present in the atmosphere is –

(a) Infrared
(b) Visible
(c) Ultraviolet
(d) Microwave

[U.P.P.C.S.(Pre) 2013]


7. Ultraviolet radiation from sunlight causes the reaction that produce which of the following?

(a) C O
(b) SO2
(c) O3
(d) Fluorides

[U.P. P.C.S. (Pre) 2018]


8. Ozone protects the biosphere from –

(a) Infra-red rays
(b) Ultraviolet rays
(c) X-rays
(d) Gama rays

[U.P.P.C.S. (Pre) 2014]


9. Ozone layer in atmosphere –

(a) Produces rain
(b) Produces pollution
(c) Provides safety to life on Earth from ultraviolet radiation
(d) Produces oxygen in the atmosphere

[U.P.P.C.S. (Pre) 2006, U.P. Lower Sub. (Pre) 2004]


10. Harmful ultraviolet radiation coming from the sun can cause –

(a) Liver cancer
(b) Brain cancer
(c) Oral cancer
(d) Skin cancer

[U.P.P.C.S. (Pre) 2014]


11. “Ozone Layer Preservation Day” is celebrated on

(a) 16 September
(b) 5 June
(c) 23 March
(d) 21 April

[M.P.P.C.S. (Pre) 2014]


12. The ozone hole is caused by

(a) Acetylene
(b) Ethylene
(c) Chlorofl fluorocarbons
(d) Methane

[U.P.P.C.S. (Pre) 2016]


13. Which one of the following is not responsible for the depletion of the ozone layer:

(a) CFC-12 used in refrigerators
(b) Methyl chloroform used as a solvent
(c) HALON-1211 used in fi re fi ghting
(d) Nitrous oxide

[U.P.P.C.S. (Pre) 2002, U.P. Lower Sub. (Pre) 2002]


14. Among the following greenhouse gases, which does not cause ozone depletion in the troposphere?

(a) Methane
(b) Carbon monoxide
(c) Nitrogen Oxides (NO)
(d) Water vapors

[U.P.P.C.S. (Pre) 2008]


15. Formation of the ozone hole is maximum over- –

(a) India
(b) Africa
(c) Antarctica
(d) Europe

[M.P.P.C.S. (Pre) 2008]


16. The Montreal Protocol is related to the protection of:

(a) Greenhouse gases
(b) Acid rain
(c) Ozone layer
(d) Endangered species

[Uttarakhand P.C.S. (Pre) 2010]


17. The Montreal Protocol is related to the?

(a) White Lion
(b) Chlorofluorocarbon
(b) Water pollution
(d) Agriculture

[M.P.P.C.S. (Pre) 2014]



1. In the stratosphere, the level of ozone is naturally regulated by –

(a) Nitrous oxide
(b) Nitrogen dioxide
(c) CFC
(d) Water vapors

[U.P.P.C.S. (Mains) 2016]


2. Consider the following statements: Chlorofluorocarbons, known as ozone-depleting substances, are used

1. In the production of plastic foams.
2. In the production of tubeless tires.
3. In cleaning certain electronic components.
4. As pressurizing agents in aerosol cans.

Which of the statements given above is/are correct?

(a) 1, 2 and 3
(b) Only 4
(c) 1, 3 and 4
(d) 1, 2, 3 and 4

[I.A.S. (Pre) 2012]


3. Which of the following substances is/are ozone-depleting? Select the correct answer from the codes given below:

1. Chlorofluorocarbons
2. Halans
3. Carbon tetrachloride

Codes :

(a) 1 only
(b) 1 and 2 only
(c) 1 and 3 only
(d) 1, 2 and 3

[U.P.P.C.S.(Pre) 2012]


4. 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?

(a) Presence of prominent tropospheric turbulence and inflow of chlorofluorocarbons
(b) Presence of prominent polar front and stratospheric clouds and inflow of chlorofluorocarbons
(c) Absence of polar front and stratospheric clouds and inflow of methane and chlorofluorocarbons
(d) Increased temperature in the polar region due to global warming.

[I.A.S. (Pre) 2011]


5. Which gas is filled in refrigerators?

(a) Ammonia
(b) Mafron
(c) Methane
(d) Acetylene

[Uttarakhand P.C.S. (Pre) 2010]


6. Which one of the following teams of scientists first discovered the ‘ozone hole’ over Antarctica?

(a) Russian Team
(b) German Team
(c) American Team
(d) British Team

[U.P.P.C.S. (Mains) 2013]


7. Who among the following had discovered the ‘ozone halo’ over the Tibetan Plateau in 2005?

(a) M. Molina
(b) Joseph Farman
(c) G.W. Kent Moore
(d) Marcus Rex

[U.P.P.C.S. (Mains) 2013]


8. Consider the following statements:

Assertion (A): 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 codes 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

[U.P. U.D.A./L.D.A. (Mains) 2010, U.P.P.C.S. (Mains) 2010]


9. Which of the following is not correctly matched?

(a) Ozone – Chlorofluorocarbon (CFC)
(b) Acid rain – Nitric Acid
(c) Rocket fuel – Kerosene Oil
(d) Green House Eff ect – Carbon dioxide

[Uttarakhand P.C.S. (Mains) 2002]


10. 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

[I.A.S. (Pre) 2015]