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
Which of the following chemical is released by chlorofluorocarbon that is 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

Chlorofluorocarbons are the compounds which are used as coolants in the air conditioning systems, refrigerators, coolers, etc. The CFCs, when released into the atmosphere, react with UV rays to form chlorine atoms which destroy the ozone layer and results in the thinning out of the ozone layer also known as the ozone hole.

Thus, the correct answer is option D. 

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

Increase skin cancer and higher mutation rates are generally the consequences of

  1. CO$ _2$

  2. Ozone depletion

  3. Biomagnification

  4. Acid rains
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ozone layer is present in the stratosphere above the Earth. The layer of ozone is responsible for the absorption of the harmful ultraviolet radiations from the solar radiations. Due to ozone depletion, these radiations enter the Earth's atmosphere and cause skin cancer. The radiations can also damage the eye and other exposed parts of the body. The radiations can also cause mutations like thymine dimer formation or breaking of the hydrogen bonds. 

Thus, 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 factor responsible for depletion of ozone layer is

  1. Excessive use of automobiles

  2. Excessive industrial units

  3. Excessive use of man made compounds containing chlorine and fluorine

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

Chlorofluorocarbon compounds are released from automobiles, refrigerators, etc. These compounds cause an increase in atmospheric temperature causing global warming.

So, option C " Excessive use of man-made compounds containing chlorine and fluorine" is the correct answer.

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

The ozone layer: Between 15 and 50 km above the earth is a thin layer of gas called 'ozone'. It protects the earth from most of the sun's harmful ultraviolet radiation. Too much radiation causes blindness in animals and skin cancer in people. In 1985, scientists discovered a hole in the ozone layer in the Antartica. They have recently discovered a smaller hole over the arctic. The ozone layer is also becoming thinner over other locations of the earth too. Scientists believe that over the last 10 years about 30% of the ozone layer has disappeared. This damage is caused by chemicals. Choose the right statement(s) from the following. 

  1. The greenhouse effect would be more efficient and the temperature of earth would increase.

  2. CFCs would result in the depletion of the ozone layer.

  3. Infrared radiation from the sun would bombard earth.

  4. Ultraviolet radiation from the sun cannot enter earth.
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. 

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

Ozone is found in the atmosphere and helps to protect us from harmful radiation. Ozone is

  1. $\displaystyle { O }^{ 2- }$
  2. $\displaystyle { O }^{ - }$
  3. $\displaystyle \\ { O } _{ 2 }\\ $
  4. $\displaystyle \\ { O } _{ 3 }\\ $
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ozone is an inorganic molecule formed by the three molecules of oxygen with the chemical formula O$ _3$. It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope O$ _2$ and more reactive molecule.

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

Which of the following conditions lead to formation of ozone?

  1. When oxygen molecules absorb ultraviolet photons and undergo photolysis

  2. When carbon molecules absorb ultraviolet photons and undergo photolysis

  3. When oxygen molecules absorb ultraviolet electrons and undergo photolysis

  4. When oxygen molecules absorb ultraviolet neutrons and undergo photolysis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation


When oxygen molecules absorb ultraviolet photons and undergo photolysis, ozone is obtained
$3O _2 \xrightarrow [photolysis]{UV : light} 2O _3$.

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

40 to 50% depletion in ozone layer occurs in the .......... polar region

  1. North

  2. South

  3. East

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

40 to 50% depletion in ozone layer occurs in the South polar region.
Ozone is destroyed by collisions with other atoms and molecules.
The large scale destruction of the stratospheric ozone first came into focus in 1987 through the experiments in antarctica.

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

Depletion of ozone layer is mainly due to

  1. Methane

  2. Carbon dioxide

  3. Chloroflorocarbons

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

Depletion of ozone layer is mainly due to Chloroflorocarbons.
Note:
The following describes the destruction of the ozone by chlorofluorocarbons.
Chlorofluorocarbons contains the chlorine molecule which reacts with ozone (O$ _3$) molecule and splits into O$ _2$ and O molecules.
Chlorofluorocarbons are used in refrigerators, air conditioners and aerosol sprays. They damage the ozone layer of the atmosphere.

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

Destruction of ozone can cause 

  1. Skin cancer

  2. Cataract

  3. Hinder growth of plant

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Destruction of ozone can cause skin cancer, cataract and can hinder growth of plant. Ozone prevents the harmful radiations from reaching the surface of earth. The UV radiation has enough energy to cause adverse effects on all life systems, especially humans. It can destroy parts of DNA molecules that stores and propagate genetic information from one generation to another generation.