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

Directions: Choose the appropriate answer from the options given below:

Ozone layer is the part of the

  1. mesosphere

  2. stratosphere

  3. ionosphere

  4. troposphere

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

The ozone layer is located in the stratosphere, approximately 10-50 kilometers above Earth's surface. This layer contains high concentrations of ozone (O3) that absorbs most of the Sun's harmful ultraviolet radiation. The troposphere is the lowest layer where weather occurs, the mesosphere is above the stratosphere, and the ionosphere is in the upper atmosphere.

Multiple choice

Directions: Choose the appropriate answer from the options given below:

Arrange the various layers of the earth in the correct order? A. Ionosphere B. mesosphere C. Troposphere D. Stratosphere E. Exosphere

  1. BACDE

  2. ACDEB

  3. EDCAB

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

The correct order of atmospheric layers from lowest to highest is: Troposphere (C), Stratosphere (D), Mesosphere (B), Ionosphere (A), Exosphere (E). This matches option CDBAE. The troposphere extends from ground level to about 10-15 km, followed by the stratosphere (containing the ozone layer), then the mesosphere, ionosphere, and finally the exosphere which fades into outer space.

Multiple choice

Directions: Choose the appropriate answer from the options given below:

Which is the lowest part of the atmosphere?

  1. Ionosphere

  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 ground level to approximately 10-15 kilometers altitude. This layer contains about 75-80% of the atmosphere's mass and virtually all weather phenomena. The ionosphere is much higher, the mesosphere is above the stratosphere, and the stratosphere lies above the troposphere.

Multiple choice

Directions: Choose the appropriate answer from the options given below:

The radio waves which were transmitted from the earth are reflected back to earth by

  1. mesosphere

  2. ionosphere

  3. stratosphere

  4. troposphere

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

The ionosphere, located in the upper atmosphere (approximately 60-1000 km altitude), contains ionized particles that reflect radio waves back to Earth, enabling long-distance radio communication. This property is crucial for AM radio broadcasting and other communication technologies. The other layers (troposphere, stratosphere, mesosphere) do not have sufficient ionization to reflect radio waves effectively.

Multiple choice

Directions: Choose the appropriate answer from the options given below:

Tropopause is the zone between

  1. ionosphere and troposphere

  2. mesosphere and ionosphere

  3. exosphere and stratosphere

  4. troposphere and stratosphere

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

The tropopause is the boundary zone between the troposphere (lowest layer) and the stratosphere (layer above). At this boundary, the temperature stops decreasing with altitude (as it does in the troposphere) and begins to increase (as in the stratosphere due to ozone absorption of UV radiation). This transition zone typically occurs at 10-15 km altitude, varying with latitude and season.

Multiple choice

Directions: Choose the appropriate answer from the options given below:

The atmosphere which is important for human beings is

  1. troposphere

  2. mesosphere

  3. stratosphere

  4. ionosphere

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

The troposphere is the most important atmospheric layer for human beings because it contains the air we breathe, all weather phenomena, and virtually all human activity. It extends from ground level to about 10-15 km altitude and contains about 75-80% of the atmosphere's mass. The other layers are either too high (ionosphere, exosphere) or lack the conditions necessary for life (mesosphere, stratosphere).

Multiple choice

Directions: Choose the appropriate answer from the options given below:

Which of the following act as filter and absorb the UV rays radiating from the sun?

  1. Stratosphere

  2. Ionosphere

  3. Mesosphere

  4. Ozone

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

Ozone (O3) in the stratosphere absorbs harmful ultraviolet radiation from the sun, acting as a protective shield for life on Earth. While ozone exists in the stratospheric layer, the question specifically asks about the substance that filters UV rays - ozone itself performs this function. The ozone layer absorbs UV-B and UV-C radiation, preventing it from reaching the surface.

Multiple choice

Which of the following statements is not correct?

  1. Some gases react with green house gases and affect their concentration in the atmosphere.

  2. The largest concentration of GHGs in the atmosphere is carbon mono oxide.

  3. Ozone absorbs ultra violet radiation in the stratosphere.

  4. All of the above

  5. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This statement is incorrect. The largest concentration of GHGs in the atmosphere is carbon dioxide.

Multiple choice

Which of the following statements is correct?

a. Tokyo protocol was initiated for reducing the emission of GHGs into the atmosphere. b. The depletion of ozone concentration in the stratosphere is called the ozone hole. c. Ultra-violet rays convert ozone into oxygen.

  1. Only a

  2. Only b

  3. Only c

  4. Only a and c

  5. All of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This statement is correct. The depletion of ozone concentration in the stratosphere is called the ozone hole.

Multiple choice

The atmospheric layer farthest form the earth's surface is known as:

  1. Exosphere

  2. Ionosphere

  3. Mesophere

  4. Stratosphere

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

The exosphere is the outermost layer of Earth's atmosphere, extending from about 500 km altitude to the edge of space. It is followed inward by the thermosphere, mesosphere, stratosphere, and troposphere (lowest).

Multiple choice

The atmospheric layer which reflects radio waves is called

  1. exosphere

  2. ionosphere

  3. stratosphere

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

The ionosphere, located between 60-1000 km altitude, contains ionized particles that reflect radio waves back to Earth, enabling long-distance radio communication. The exosphere (A) is too thin, stratosphere (C) contains ozone but doesn't reflect radio waves well, and troposphere (D) is where weather occurs but doesn't reflect radio waves.

Multiple choice

Which component of the Sun's rays is absorbed by the ozone layer?

  1. I.R

  2. U.V

  3. Visible

  4. Both (A) and (B)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ozone layer, located in the stratosphere, primarily absorbs ultraviolet (UV) radiation from the sun. This absorption is crucial for protecting life on Earth from harmful UV rays that can cause skin cancer and damage ecosystems. IR and visible light mostly pass through the atmosphere.

Multiple choice

Which of the following statements is true?

  1. Ozone is a mono-atomic form of oxygen.

  2. Ozone is a poisonous gas.

  3. Ozone is present in the lower atmosphere.

  4. Ozone reflects the sun's rays.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ozone is indeed a poisonous gas - at ground level it is harmful to breathe and can damage lung tissue and plant life. It is triatomic (O3, not mono-atomic), found primarily in the upper atmosphere (stratosphere, not lower), and absorbs UV radiation rather than reflecting it. Statement B is the only true statement among the options.