Tag: causes of greenhouse effect

Questions Related to causes of greenhouse effect

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.

Ozone protects biosphere from high energy

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

  1. Infra-red rays

  2. Ultraviolet rays

  3. X - rays

  4. Gamma rays

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Correct Option: B
Explanation:

The ozone layer is mainly found in the stratosphere. Ozone layer acts as a shield that absorbs ultraviolet radiation from the sun. UV rays are highly injurious to living organisms since DNA and proteins of living organisms preferentially absorb UV rays, and its high energy breaks the chemical bonds within these molecules. UV-B damages DNA and mutation may occur. It causes aging of the skin, damage to skin cells and various types of skin cancers.

Chlorofluorocarbon releases a chemical harmful to ozone

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

  1. Fluorine

  2. Sulphur dioxide

  3. Nitrogen peroxide

  4. Chlorine

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Correct Option: D
Explanation:

Ozone gas is a layer which is present in the stratosphere and absorbs the harmful ultraviolet radiation. The ozone depletion takes due to the excessive emission of (CFCs). CFC find wide use as refrigerants. CFCs discharged in the lower part of atmosphere move upward and reach stratosphere. In stratosphere, UV rays act on them releasing Cl atoms. Cl degrades ozone releasing molecular oxygen, with these atoms acting merely as catalysts; Cl atoms are not consumed in the reaction. Hence, whatever CFCs are added to the stratosphere, they have permanent and continuing affects on ozone levels. This has resulted in formation of a large area of thinned ozone layer, commonly called as the ozone hole.

Therefore, the correct answer is option D.