Tag: ozone layer depletion

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Questions Related to ozone layer depletion

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

HCs are thermodynamically not stable towards

  1. Acidification

  2. Decomposition

  3. Reduction

  4. Oxidation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hydrocarbons (HCs) are generally susceptible to oxidation reactions, especially in the presence of oxygen or oxidizing agents, which is why they are not thermodynamically stable in such environments.

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

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

  1. Methane

  2. Propane

  3. Butane

  4. Ethane
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Butane and other hydrocarbons like isobutane are commonly used as eco-friendly alternatives to CFCs in modern refrigeration systems because they have zero ozone depletion potential.

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

Ozone depletion is occurring due to 

  1. PCB

  2. CO

  3. PAN

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

The major pollutants to deplete ozone are

  1. Chlorofluorocarbons

  2. Nitrogen oxides

  3. Hydrocarbons

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Ozone layer of upper atmosphere is being destroyed by 

  1. Sulphurdioxide

  2. Carbondioxide

  3. Chlorofluorocarbon

  4. Smog
Reveal answer Fill a bubble to check yourself
C Correct answer
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.
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Ozone protects biosphere from high energy

  1. Infra-red rays

  2. Ultraviolet rays

  3. X - rays

  4. Gamma rays
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Chlorofluorocarbon releases a chemical harmful to ozone

  1. Fluorine

  2. Sulphur dioxide

  3. Nitrogen peroxide

  4. Chlorine
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Ozone layer is disturbed by

  1. Large number of factories

  2. Supersonic jets

  3. Large number of automobiles

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Ozone is a form of a blanket covering the upper atmosphere which protects the earth from harmful ultraviolet rays. Because of ozone depletion, these rays can now reach the earth through hole which was previously protected by ozone blanket. The various causes of ozone depletion are as follows:
  • Huge combustion of fossil fuel and organic matter.
  • Excessive use of nitrogenous fertilizers.
  • supersonic rockets and space shutters.
  • Nuclear test.
  • Excessive use of chlorofluorocarbons.
So, the correct answer is option B.
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

The common refrigerant chlorofluoromethane (freon) and NO$ _x$ is a serious pollutant because

  1. It destroys haemoglobin
  2. It disrupts O$ _3$ layer

  3. It lowers atmospheric temperature

  4. It prevents cloud condensation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chlorofluorocarbons (Freons) release chlorine radicals in the stratosphere, which react with and destroy ozone (O3) molecules, leading to the depletion of the ozone layer.

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

CFCs used in refrigerators cause 

  1. Water pollution

  2. Ozone depletion

  3. Acid rain

  4. Photochemical smog
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The presence of CFCs in the atmosphere results in the depletion of the ozone layer. They are used as coolants in refrigerators, coolers, etc. The CFCs causes the breaking of the ozone molecule which forms the oxygen radical and O$ _2$. The depletion of the ozone layer results in the penetration of the harmful UV radiations from the sun into the Earth's atmosphere. 

Thus, the correct answer is option B.