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

The harmful solar rays UV-B are absorbed by

  1. Oxygen

  2. Ozone

  3. Nitrogen

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

The ozone layer in the stratosphere acts as a shield, absorbing the majority of the sun's harmful ultraviolet (UV-B) radiation before it reaches the surface.

Multiple choice

In which surface of atmosphere do the Jet planes Fly?

  1. Ionosphere

  2. Stratosphere

  3. Exosphere

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

Jet aircraft typically fly in the lower stratosphere to avoid the turbulent weather conditions characteristic of the troposphere below and to take advantage of stable air and stable temperatures.

Multiple choice

Which of the following statements is/are correct about polar stratospheric clouds (PSCs)?

  1. PSCs do not react with chlorine nitrate and HCl.

  2. A tight whirlpool of wind called polar vortex is formed which surrounds Antarctica.

  3. Type II clouds are formed at about - 85˚C and contain some ice.

  4. Type I clouds are formed at about - 77˚C and contain solid HNO3.3H2O.

  5. Statements 2 and 4 are correct.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This statement is correct because Type II clouds are those which are formed at about - 85˚C and contain some ice. So this option is wrong.

Multiple choice

In atmosphere the lowermost layer is the

  1. Troposphere

  2. Exosphere

  3. Ionosphere

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

The troposphere is the lowest layer of Earth's atmosphere, extending from the surface to about 8 to 15 kilometers, where most weather phenomena occur.

Multiple choice

Which atmospheric layer is nearest to the earth?

  1. Thermosphere

  2. Mesosphere

  3. Stratosphere

  4. Troposphere

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

The troposphere is the lowest layer of Earth's atmosphere, extending from the surface to about 8 to 15 kilometers high. It is where most weather phenomena occur.

Multiple choice

Which of the following statements is not true for ozone layer?

  1. Depletion of the ozone layer is due to the burning of wood and charcoal.

  2. Use of aerosol depletes the ozone layer.

  3. Ozone layer is very important for the existence of life on earth.

  4. Ozone layer absorbs mist of harmful ultra-violet radiations coming from sun.

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

Ozone depletion is primarily caused by chlorofluorocarbons (CFCs) found in aerosols and refrigerants, not by the burning of wood or charcoal. The other statements correctly describe the importance and function of the ozone layer.

Multiple choice

Which of the following gases is responsible for ozone layer depletion?

  1. C.F.C

  2. CH4

  3. CO2

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

Chlorofluorocarbons (CFCs) are synthetic compounds that release chlorine atoms when exposed to UV radiation in the stratosphere, which then catalyze the destruction of ozone molecules. Other gases listed are greenhouse gases or pollutants, but they do not directly deplete the ozone layer.

Multiple choice

Radio waves are reflected by the ___________.

  1. troposphere

  2. ionosphere

  3. stratosphere

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

The ionosphere contains a high concentration of ions and free electrons, which reflects radio waves back to Earth, enabling long-distance communication.

Multiple choice

Ozone present in the upper layers of the atmosphere absorbs

  1. ultraviolet solar radiation

  2. dust particles

  3. inert gases

  4. electrically charged particles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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