Environmental Studies · Geography

Atmospheric Structure and Ozone

1,319 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

Which of following options is true?

  1. Up to about 15 km above the Earth’s surface, both ozone and chlorofluorocarbons (CFC) are injurious to life.

  2. Up to 15 km above the Earth’s surface, ozone is favorable to life but CFCs are injurious.

  3. Beyond about 20 km above the Earth’s surface, presence of ozone is important to life on Earth and CFCs are favorable.

  4. Beyond about 20 km above the surface of the Earth, ozone is important to life on Earth but CFCs are injurious.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Beyond about 20 km above the surface of the Earth, ozone is important to life on Earth but CFCs are injurious. Ozone gas absorbs the UV-radiation of sun & gets converted into oxygen (O2). This prevents mutagenic activities of UV-radiation of the living world. Each molecule of CFC destroys thousands of molecules of O3. 

Multiple choice

Ozone (O3) is formed in which zone of atmosphere?

  1. Mesosphere

  2. Stratosphere

  3. Troposphere

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

The ozone layer or ozone shield refers to a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet (UV) radiation.

Multiple choice

Out of the following, which is the most ideal layer of the atmosphere for flying aeroplanes?

  1. Troposphere

  2. Ionosphere

  3. Stratosphere

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

The stratosphere is ideal for flying because it contains the ozone layer, has minimal turbulence and weather phenomena, and provides stable air currents. The troposphere has weather and turbulence. The ionosphere and exosphere are too high for conventional aircraft and have extremely thin air.

Multiple choice

Ozone hole was first observed over

  1. America

  2. Europe

  3. Australia

  4. Antarctica

  5. Arctic circle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct answer as the first ever hole in ozone layer was first observed over Antarctica.

Multiple choice

What is the actual reason behind this depletion?

Ozone gas absorbs the UV-radiation of Sun and gets converted into oxygen (O2). This prevents mutagenic activities of UV-radiation of the living world. So, ozone layer is indispensible to safe life & the depletion of ozone layer due to manmade activities could be catastrophic.

  1. Excessive contamination of different environmental resources

  2. Construction of building and continuous civilization

  3. Many modern techniques which result in degradation & environmental pollution

  4. Production and release of CFC (chlorofluorocarbons) from different industrial chemicals

  5. Exhaust fumes of automobiles & radioactive contamination of air
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The actual reason behind this depletion is the production & release of CFC (chlorofluorocarbons) from different industrial chemicals. The use of CFC cannot be controlled as it is extremely valuable, useful & extensively used in industry (as refrigerants & aerosol propellants).

Multiple choice

What is the most dangerous consequence of this ozone depletion?

Ozone gas absorbs the UV-radiation of Sun and gets converted into oxygen (O2). This prevents mutagenic activities of UV-radiation of the living world. So, ozone layer is indispensible to safe life & the depletion of ozone layer due to manmade activities could be catastrophic.

  1. Lung cancer, throat cancer & nicotine deposition on enamel of teeth

  2. Skin cancer

  3. Melting of glacier ice & rising of warmer sea water causes expansion of sea level

  4. Damages in different parts of trees like loss of leaves, harm in bark and retarded growth

  5. Partial loss of hearing & loss of air cells from organ of corti
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Small amount (1%) of O3-depletion causes huge amount (2%) of UV-radiation enter the planet. The most dangerous consequences of this depletion is skin-cancer. It is estimated that by the year 2075 around 60 million Americans will get affected by this fatal disease, i.e., skin-cancer.

Multiple choice

Assertion(A): Farmen et al reported that from 1875 to 1985, a reduction of 40% to 50% of ozone content over Antarctica occured, reaching Southern New Zealand, Australia and Southern America. Reasoning (R): Ozone layer thinning in the stratosphere directly influences the increase in global warming.

  1. Both Assertion and Reasoning are true and R is the correct explanation of A.

  2. Both Assertion and Reasoning are true and R is not the correct explanation of A.

  3. A is true and R is false.

  4. Both A and R are false
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ozone layer thinning in the stratosphere increases global warming due to the penetration of UV rays through the ozone layer.

Multiple choice

The depletion of ozone layer in the stratosphere causes

  1. lung cancer

  2. skin cancer

  3. bone cancer

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

 The layer of ozone gas is what which protects us from the harmful ultraviolet radiations of the sun. The ozone layer absorbs these harmful radiations and thus prevents these rays from entering the earth’s atmosphere. The depletion of ozone layer in the stratosphere causes skin cancer.

Multiple choice

The harm from the depletion of Earth's ozone layer is that ________.

  1. the average temperature of earth's surface will increase gradually

  2. the oxygen content of the atmosphere will decrease

  3. increased amount of Ultra violet radiation will reach earth's surface

  4. sea levels will rise as the polar ice caps will gradually melt

  5. all of these will happen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is the correct answer.