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

Which of the following is the topmost layer of the atmosphere?

  1. Troposphere

  2. Exosphere

  3. Stratosphere

  4. Mesosphere

  5. Thermosphere
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. Exosphere is the topmost layer of the atmosphere. This is the outermost region of the Earth's atmosphere, lying above the thermosphere and extending thousands of kilometres into space.

Multiple choice

Which of the following substances cause(s) ozone depletion?

  1. Methyl bromide

  2. Nitrogen oxides

  3. Chlorofluorocarbons

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

This is the correct option as all of the above are ozone-depleting substances. This is the correct option as all of the above are ozone depleting substances.

Multiple choice

Which of the following statements is/are false?

a. Ozone is present in significant amounts in the troposphere region of the atmosphere. b. The density of the ozone layer varies greatly, being thickest at high latitudes in late summer and much thinner over the tropics. c. Ozone is a blue gas with a pungent odour and is highly poisonous to the living systems.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option as this statement is false. Ozone is present in significant amounts in the stratosphere, and not the troposphere region of the atmosphere.

Multiple choice

Aeroplanes generally fly in the

  1. troposphere

  2. stratosphere

  3. mesosphere

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

Commercial aircraft cruise in the lower stratosphere (typically 9-12 km altitude). This layer is above the turbulent troposphere and its weather systems, providing smoother flight conditions and better fuel efficiency for long-haul flights.

Multiple choice

Ozone layer is found in

  1. hydrosphere

  2. lithosphere

  3. stratosphere

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

The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 20 to 30 kilometres (12 to 19 mi) above Earth.

Multiple choice

The layer of atmosphere close to the earth's surface is called�

  1. Exosphere

  2. Troposphere

  3. Stratosphere

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

The troposphere is the lowest layer of Earth's atmosphere, extending from the surface up to about 10-15 km. All weather phenomena occur in this layer. The exosphere is the outermost layer, stratosphere contains the ozone layer, and ionosphere is within the thermosphere.

Multiple choice

The ozone protects the earth from the ____________ of the sun.

  1. U.V. rays

  2. X rays

  3. gamma rays

  4. infra red rays
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The ozone layer in the stratosphere absorbs most of the Sun's harmful ultraviolet (UV) radiation before it reaches Earth's surface. This protection is crucial for life on Earth, as UV rays can damage DNA, cause skin cancer, and harm ecosystems.