Tag: ozone layer depletion and causes

Quizzes (0) Questions (92)

Questions Related to ozone layer depletion and causes

Multiple choice commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

Result of ozone hole is 

  1. UV radiation reaching earth

  2. Green house effect

  3. Acid rain

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

Ozone layer is present in the stratosphere which absorbs the harmful ultraviolet radiation Ultraviolet rays cause heritable mutational changes. They have the capability to destroy plants and animals and can cause skin cancer, cataracts to human beings. Existence of life on earth is possible only because of the presence of ozone layer around the earth. The main cause of the ozone hole was found to be gases that contained chlorofluorocarbons (CFCs), halons and freons. Found commonly in aerosol cans and released by many electronic appliances, these decrease the level of ozone in the stratosphere. All of these gases contain chlorine, which is a major cause behind the thinning of the ozone layer. The presence of chlorine within CFCs break down the ozone gases in ozone layer which increases the chances of ozone depletion. CFCs have accounted for about 80% of ozone depletion. 

Multiple choice commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

Ozone hole over Antarctica appears during

  1. Late August- Early October

  2. March- April

  3. October- November

  4. January- February
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Polar spring, also known as the Antarctic Spring is the period from late August to early October and the strong westerlies circulate around the Antarctic continent creating a polar vortex. The polar vortex results in the formation of the polar stratospheric clouds which trap most of the gases including the ozone-depleting factors like CFCs, methyl bromide etc. 

Hence, the correct answer is 'Late August - Early October'

Multiple choice commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

Ozone hole over Antarctica was first detected by

  1. Molina and Rowland

  2. Farman et al

  3. Augus

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

The discovery of the ozone hole over Antarctica was done by British Antarctic Survey Scientist Farman, Gardiner and Shanklin and reported in the Nature journal in May 1985. The ozone hole is defined as the area in the atmosphere where the value of the ozone is less than 220 DU. Paul Crutzen, Mario Molina and Sherwood Rowland gave the observation of CFCs in degradation of the ozone.

Hence, the correct answer is 'Farman et al'.

Multiple choice commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

Ozone hole is widest over

  1. Equator

  2. North pole

  3. North temperate area

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

The ozone layer in the stratosphere is created by the interaction of the UV radiation from the sun and the oxygen. It is capable of absorbing the most damaging type of UV radiation called the UV-B. The ozone hole refers to the depletion of the ozone by the pollutants like CFCs, HCFCs and HFCs. The pollutants split up due to UV radiation and the nascent chlorine reacts with the ozone molecules to form the oxygen. Over Antarctica, the ozone is highly depleted and so the widest ozone hole is seen there. This is because of the presence of the stratospheric cloud in abundance.

Hence, the correct answer is 'Antarctica'

Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Greenhouse effect is due to

  1. accumulation of $ { O } _{ 3 } $ and depletion of $ { CO } _{ 2 } $
  2. accumulation of both $ { O } _{ 3 } $ and $ { CO } _{ 2 } $
  3. accumulation of $ { CO } _{ 2 } $ and depletion of $ { O } _{ 3 } $

  4. presence of green plants on the Earth.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Greenhouse effect, a warming of Earth’s surface and troposphere (the lowest layer of the atmosphere) is caused by the presence of water vapour, carbon dioxide, methane, and certain other gases in the air. Of those gases, known as greenhouse gases, water vapour has the largest effect. The atmosphere allows most of the visible light from the Sun to pass through and reach Earth’s surface. As Earth’s surface is heated by sunlight, it radiates part of this energy back toward space as infrared radiation. This radiation, unlike visible light, tends to be absorbed by the greenhouse gases in the atmosphere, raising its temperature. The heated atmosphere in turn radiates infrared radiation back toward Earth’s surface. 
So the correct option is 'accumulation of CO$ _2$ and depletion of O$ _3$'.

Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Read the given statements and select the correct option.


Statement 1: The average temperature of Earth has increased by $ 0.6 $ during the past century.
Statement 2: There has been a progressive increase in the use of fossil fuels generating more greenhouse gases.

  1. Both statements 1 and 2 are correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statements 1 and 2 are incorrect.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The various greenhouse gases are $ { CO } _{ 2 }, { CH } _{ 4 }, { CFC } _{ s } $ and $ { N } _{ 2 }{ O } $. Excessive use of fossil fuel is adding more $ { CO } _{ 2 } $ to atmosphere. This increase in concentration of greenhouse gases has led to considerable heating of earth leading to global warming. During the pas century, the temperature of earth has increased by $ 0.6 $.

Multiple choice zoology natural resources - air, water and land carbon cycle ozone layer depletion and causes depletion of ozone layer

Identify the incorrect statement from the following

  1. Oxides of nitrogen in the atmosphere can cause the depletion of ozone layer

  2. Ozone absorbs the intense ultraviolet radiations of the sun

  3. Depletion of ozone layer is because of its chemical reactions with CFC

  4. Ozone absorbs infrared radiations
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ozone doesn't absorb infrared radiation , it absorbs ultraviolet radiations .

Multiple choice zoology physical resources carbon cycle ozone layer depletion and causes depletion of ozone layer

In absence of Green House Gases, the temperature of Earth shall fall down to ___

  1. -18 degree Celcius

  2. -15 degree Celcius

  3. -20 degree Celcius

  4. -10 degree Celcius
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Because Green House Gases are responsible to trap heat in earth surface. If green house gases are absent, the temperature of Earth shall fall down to -18 degree Celcius

So, the correct answer is '-18$^0$

Multiple choice zoology physical resources carbon cycle ozone layer depletion and causes depletion of ozone layer

Correct percentage of two green house gases is

  1. $N _2O-6\%, CO _2-86\%$
  2. $CH _4-20\%, N _2O-18\%$
  3. $CO _2-40\%, CFC-30\%$
  4. $CFC-14\%, CH _4-20\%$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The warming of earth's surface when sun radiations are absorbed and trapped in earth's atmosphere, is called greenhouse effect. The gases responsible for green house effect are called green house gases which trap the radiations and don't let them reflect back from the earth's surface. The green house gases are Chlorofluorocarbons (CFC's), Carbon dioxide (CO2), Methane (CH4) and Nitrous Oxide (N2O). 
The approximate percentage of different greenhouse gases in the atmosphere is:
CFCs - 14%
CO2 - 60%
‎CH4 - 20%
N2O - 6%
So, the correct answer is 'CFC−14%, CH4 - 20%