Environmental Studies · Geography

Atmospheric Structure and Ozone

1,401 Questions

Atmospheric structure and ozone layer topics examine the Earth's atmospheric layers, the impact of solar radiation, and ozone depletion mechanisms. These environmental science concepts are crucial for general awareness sections in multiple competitive examinations. Review these questions to solidify your understanding of the stratosphere, polar vortex effects, and greenhouse gases.

Earth's atmospheric layersOzone layer depletionSolar ultraviolet radiationPolar vortex effectsCarbon dioxide impactOzone-depleting substances

Atmospheric Structure and Ozone Questions

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

What happen when the destruction of the ozone layer increases?

  1. The amount of harmful ultraviolet radiation

  2. The amount of needful ultraviolet radiation

  3. The amount of ultra radiations

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When the destruction of the ozone layer increases, the amount of harmful ultraviolet radiation increases.
Note:
Ozone layer acts as natural sun block and shields us from the UV radiations of the sun which are dangerous to living organisms.
The ozone molecules absorb ultraviolet rays between 310 to 200 nm wavelength.
Ozone absorbs UV radiation to give back oxygen. Thus, the ozone layer acts as a screen and prevents the harmful radiations from reaching the surface of earth.

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

Ozone is present as a chief constituent in which region of the atmosphere?

  1. Troposphere

  2. Stratosphere

  3. Mesosphere

  4. Thermosphere
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The stratosphere is a second layer of Earth's atmosphere. The troposphere, the lowest layer, is right below the stratosphere. The next higher layer above the stratosphere is the mesosphere.
Ozone is a three oxygen molecule that are abundant in the stratosphere, it absorbs energy from incoming ultraviolet radiation from the Sun. 
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

The stratospheric ozone depletion leads to

  1. Global warming

  2. Increase in the incidence of skin cancers

  3. Forest fires

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Thinning of ozone layer increases the amount of UV-B radiations reaching the earth. This may lead to incidences of cataract, skin cancers, photo burning etc. Decreased photosynthetic activity will increase carbon dioxide concentration of the atmosphere resulting in global warming. Increased exposure of radiations may also lead to forest fires especially during dry summers.
So, the correct answer is 'All of the above'
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Freon gas causing stratosphere $O _3$ depletion is mainly released from

  1. Refrigerators

  2. Automobiles

  3. Thermal power plants

  4. Steel industry
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Freon gas is a type of chlorofluorocarbon (CFC) i.e., it contains carbon and hydrogen along with fluorine and chlorine. It is used as a refrigerant. CFCs release chlorine atoms in the atmosphere that react with ozone and cause its depletion. Hence, Freon causes ozone depletion and it is released from refrigerators.
So, the correct answer is 'Refrigerators'.
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Maximum ozone depletion is caused by

  1. $CO _2$

  2. CFC
  3. $SO _2$
  4. $CH _4$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The primary cause for ozone depletion are CFCs. CFCs or Chlorofluorocarbons are the compounds that contain carbon and hydrogen along with chlorine and fluorine. They are used as refrigerants and in air conditioners. CFCs release chlorine radicals that react with ozone and cause its degradation. The mechanism of ozone depletion by CFC is as follows:
              UV- C
CFCl3 ----------------> CFCl2 + Cl
               UV-C
CFCl2 -----------------> CFCl + Cl
Cl + O3 ----------------> ClO + O2
ClO + O3 --------------> Cl + 2O2
Hence, CFC causes degradation of ozone. Also, the chlorine atom remains in the atmosphere and reacts with another molecule of ozone.
So, the correct answer is 'CFC'.
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Which of the following are main responsible for ozone depletion?

  1. Chlorofluorocarbons

  2. Hydrocarbons

  3. Carbon monoxide

  4. Carbon dioxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Ozone depletion occurs when chlorofluorocarbons (CFCs) present in aerosols and refrigerants are released into the stratosphere. 
  • Ultraviolet radiations from the sun break these CFCs molecules and release the chlorine atoms.
  • Chlorine atom reacts with the ozone (O3) molecules and starts the ozone destruction cycle.
  • So, the correct answer is 'Chlorofluorocarbons'.
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Which harmful radiations are absorbed by ozen layer?

  1. UV

  2. X-RAY

  3. Visible light

  4. Gamma rays
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The ozone layer or ozone($O _3$) shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet(UV)radiation.
  • Overexposure to UV radiation may cause skin cancer, damage of the eye and the suppression of the immune system.
  • Hence The harmful radiations are absorbed by ozone layer UV.
  • So, the correct answer is 'UV'.
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Why ozone is known as 'chemical weed ' ?

  1. Because it is formed by chemical reactions

  2. Because it is harmful as well useful

  3. Because it is harmful, just like weeds for mankind

  4. Ozone is not designated as chemical weed
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ozone is an inorganic molecule and a light blue gas with a pungent odor that is prevalent in the stratosphere just below the atmosphere of the earth. Without ozone, plants and animals would be receiving so much radiation from the sun that it would be difficult, if not impossible, for life to even survive here. The effects of no ozone to protect these harmful rays would be that all life here on earth would soon burn up, essentially. Although most associated with the atmosphere, ozone is also a powerful oxidant with many industrial and consumer uses. However, it must be used with extreme caution. The high oxidizing potential of ozone causes damage to mucous and respiratory tissues in animals and also damages tissue in plants at extremely high levels. In commercial agriculture, ozone can be used in conjunction with other chemicals and gases as a control for certain noxious weeds or pests.


So, the correct option is 'Option A', Because it is formed by chemical reactions.

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

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.