Tag: global environmental change

Quizzes (7) Questions (240)

Questions Related to global environmental change

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

The effect of ozone depletion include

  1. UV light reaches the earth

  2. affect the climate

  3. cause skin cancer

  4. all the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ozone depletion allows more harmful UV radiation to reach the Earth, which can lead to skin cancer and other health issues, and it also impacts global climate patterns. Therefore, all listed effects are correct.

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

Major cause of Ozone depletion is due to which chemical?

  1. Chloro Fluoro Carbons

  2. Polyphenols

  3. Dioxins

  4. Rayon
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chlorofluorocarbons (CFCs) are the primary chemicals responsible for the depletion of the ozone layer. They release chlorine atoms when exposed to UV radiation in the stratosphere.

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

What gases are involved in ozone depletion?

  1. Nitrogen

  2. Chlorine and Bromine

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

  4. Both B and C
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chlorine and bromine atoms are the active agents that destroy ozone molecules. While CFCs are the source, the gases involved in the actual chemical reaction are chlorine and bromine.

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

What causes effects of ozone layer?

  1. Alpha Radiations

  2. Ultraviolet Radiations

  3. Gamma radiations

  4. Beta Radiations
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ozone layer protects the Earth by absorbing harmful ultraviolet (UV) radiation from the sun. Depletion of this layer leads to increased exposure to these radiations.

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.