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

Ozone is formed by

  1. Two atoms of oxygen

  2. Four atoms of oxygen

  3. Three atoms of oxygen

  4. Three atoms of nitrogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ozone is an inorganic molecule with the chemical formula O3. It consists of three oxygen atoms bonded together.

Multiple choice

The layer of atmosphere used for radio wave transmission is

  1. chromospheres

  2. troposphere

  3. ionosphere

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ionosphere contains a high concentration of ions and free electrons, which allows it to reflect radio waves back to Earth, facilitating long-distance communication.

Multiple choice

Ozone is important to mankind because it

  1. releases hydrogen in the atmosphere

  2. maintains the temperature of the earth

  3. creates a protective coverage against ultraviolet rays

  4. releases oxygen in the air
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ozone layer in the stratosphere absorbs the majority of the sun's harmful ultraviolet radiation, protecting life on Earth.

Multiple choice

Which rays are trapped in the earth’s atmosphere during the greenhouse effect?

  1. UV rays

  2. Visible rays

  3. Radio waves

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

Water vapours and certain gases in the atmosphere absorb infrared radiations, causing what is called the greenhouse effect. These infrared radiations come from materials on the earth's surface that have been heated by sunlight. These absorbed infrared radiations heat up the atmosphere. 

Multiple choice

Which of the following is/are not a factor that is/are responsible for life on Earth?

a. Distance of the Earth from the Moon b. The layer of carbon dioxide and water vapour c. The layer of ozone

  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 is not a factor that is responsible for life on Earth. It is the distance of the Earth from the Sun that is a factor responsible for life on Earth. This distance is sufficient to keep the temperature on the surface of Earth at an average of 30 degree C.

Multiple choice

Ozone layer is a sub layer of which of the following layers of the atmosphere?

  1. Mesosphere

  2. Troposphere

  3. Inosphere

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

Ozone layer is a sub layer of Stratosphere. It is in the lower stratosphere, from 6 to 25 miles above the ground. There is also ozone present in the lower troposphere, but the ozone layer in the stratosphere contains helpful ozone that blocks much of the Sun's ultraviolet radiation. Without this layer, life on earth would be very difficult. 

Multiple choice

Which of the following pollutants causes ozone holes in the ozone layer?

  1. CO

  2. CFC

  3. SO2

  4. CO2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

CFC causes ozone holes in the ozone layer. The hole in the ozone layer happens because the ozone in the stratosphere is destroyed by chlorine and bromine from halogen atoms. These atoms come from man-made halocarbon refrigerator gases i.e. chlorofluorocarbons or CFCs which are emitted at ground level but move up into the ozone layer.  

Multiple choice

Ozone gas absorbs

  1. violet radiation

  2. ultra-violet radiation

  3. infra-red radiation

  4. none of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ozone gas absorbs ultra-violet radiation. It absorbs ultraviolet rays from the sun. Ozone is capable of absorbing infrared radiation coming from the planet and releases it during the evening hours. It is a greenhouse gas. 

Multiple choice

Which of the following statement is not true about Ozone?

  1. It is very vital for life on earth.

  2. It is formed in atmospheric air by the action of ultra-violet rays on atmospheric oxygen.

  3. It is an allotrope of oxygen.

  4. It is lighter than oxygen.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Ozone is heavier than oxygen.

Multiple choice

The Ozone layer absorbs

  1. radio waves

  2. cosmic rays

  3. ultra violet rays

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

The ozone layer in the Earth's stratosphere absorbs the majority of the sun's harmful ultraviolet (UV) radiation, protecting life on the surface.

Multiple choice

Ozone hole in the atmosphere is largely caused by the presence of

  1. Oxygen

  2. Hydrogen

  3. Chlorofluoro carbon

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

Chlorofluorocarbons (CFCs) are stable compounds that reach the stratosphere, where they release chlorine atoms upon exposure to UV radiation. These chlorine atoms catalyze the destruction of ozone molecules, leading to the depletion of the ozone layer.

Multiple choice

Directions: For the Assertion (A) and Reason (R) below, choose the correct alternative from the following. Assertion: The Ozone layer present in the upper atmosphere of earth is beneficial for sustaining life on earth. Reason: The Ozone layer blocks the harmful ultraviolet rays from the Sun and thus protects life on earth.

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

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

  3. A is true but R is false.

  4. A is false but R is true.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Both A and R are true, and R is the reason for A. Hence, option (1) is correct.