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

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

Which of the following will occur due to depletion of ozone layer?

  1. Increase in temperature of earth

  2. Decrease in oxygen content of atmosphere.

  3. Increased amount of UV radiation reaching earth

  4. Rise in sea levels and melting of glaciers

  5. Acid rain
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 Ozone layer prevents ultravoilet rays from reaching earth's surface. Depletion of ozone layer will lead to increased amount of UV raus reaching earth's surface.

Multiple choice

Assertion(A): Farmenetal reported that from 1875 to 1985, a reduction of 40% to 50% of ozone content over Antartica 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

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

Directions: Choose the option which is grammatically correct and the best version of the underlined part of the sentence.

Ozone is formed in the atmosphere from hydrocarbons and nitrogen oxides reacting with sunlight.

  1. from hydrocarbons and nitrogen oxides reacting with sunlight.

  2. when hydrocarbons and nitrogen oxides react with sunlight.

  3. as hydrocarbons and nitrogen oxides receive sunlight.

  4. by the reaction of hydrocarbons and nitrogen oxides in the sunlight.

  5. when hydrocarbons and nitrogen oxides start reacting with sunlight.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Correct; the phrase has been changed into a clause which explains the time of the formation of ozone.

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

Which of the following is correct regarding ozone layer?

  1. Ozone is a non toxic gas.

  2. It protects the surface of the earth from infrared rays.

  3. The ozone hole is an annual thinning of the ozone layer.

  4. It is present in the mesosphere.

  5. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ozone hole is a region of marked thinning of the ozone layer in high latitudes, chiefly in winter, attributed to the chemical action of CFCs and other atmospheric pollutants. The resulting increase in ultraviolet light at ground level gives rise to an increased risk of skin cancer.