Tag: global environmental change

Questions Related to global environmental change

The effect of ozone depletion include

ozone layer depletion causes of greenhouse effect causes of resource depletion global environmental change commercial applications

  1. UV light reaches the earth

  2. affect the climate

  3. cause skin cancer

  4. all the above

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Correct Option: D

Major cause of Ozone depletion is due to which chemical?

commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

  1. Chloro Fluoro Carbons

  2. Polyphenols

  3. Dioxins

  4. Rayon

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Correct Option: A

What gases are involved in ozone depletion?

commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

  1. Nitrogen

  2. Chlorine and Bromine

  3. Chlorofluorocarbons (CFCs) and Ozone Depleting Substances (ODS)

  4. Both B and C

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Correct Option: B

What causes effects of ozone layer?

commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

  1. Alpha Radiations

  2. Ultraviolet Radiations

  3. Gamma radiations

  4. Beta Radiations

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Correct Option: B

'HCFCs' can be used in refrigerants instead of

commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

  1. $CO _{2}$

  2. Chlorine

  3. CFCs

  4. $O _{2}$

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Correct Option: C

HCs are thermodynamically not stable towards

commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

  1. Acidification

  2. Decomposition

  3. Reduction

  4. Oxidation

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Correct Option: D

Which among the following alkane has largely replaced the ozone layer-depleting halomethanes in household refrigerators and freezers?

commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

  1. Methane

  2. Propane

  3. Butane

  4. Ethane

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Correct Option: C

Ozone depletion is occurring due to 

commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

  1. PCB

  2. CO

  3. PAN

  4. None of the above

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Correct Option: D
Explanation:

Ozone is the protective layer present in the stratosphere. The harmful ultraviolet radiation is absorbed by the ozone layer. They are carried high into the stratosphere by wind action. Depletion begins when CFC’s get into the stratosphere. Ultraviolet radiation from the sun breaks up these CFCs. The breaking up action releases chlorine atoms. Chlorine atoms react with ozone, starting a chemical cycle that destroys the good ozone in that area. It is not depleted by PCB, carbon monoxides, and PAN. 

Therefore, the correct answer is option D.

The major pollutants to deplete ozone are

commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

  1. Chlorofluorocarbons

  2. Nitrogen oxides

  3. Hydrocarbons

  4. All of the above

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Correct Option: A
Explanation:

Pollution leads to the addition of harmful components in the environment which adversely affect the quality of the environment. CFCs is an organic compound and a volatile derivative of methane, ethane, and propane. It is known as Freon. They are used as a refrigerant. The radical chlorine escapes from CFC in the presence of UV radiation and is long lived in the upper atmosphere where it catalyzes the conversion of ozone into oxygen molecule.

So, the correct answer is option A.

Ozone layer of upper atmosphere is being destroyed by 

commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

  1. Sulphurdioxide

  2. Carbondioxide

  3. Chlorofluorocarbon

  4. Smog

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Correct Option: C
Explanation:
CFCs are used as refrigerants in refrigerators and AC. CFCs discharged in the lower part of atmosphere move upward and reach the stratosphere. In the stratosphere, UV rays act on them releasing Cl atoms. Cl reduces the ozone and releases molecular oxygen, Cl atoms are not consumed in the reaction. Hence, whatever CFCs are added to the stratosphere, they have permanent and continuing effects on ozone levels. This has resulted in the formation of a large area of thinned ozone layer, commonly called as the ozone hole.