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 light blocked by the ozone layer is known as?

  1. UVA

  2. UVB

  3. UVC

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

UVC rays are the most dangerous type of UV radiation, but they are almost entirely absorbed by the ozone layer and do not reach the Earth's surface in significant amounts.

Multiple choice

List the layers of the atmosphere in order, moving up from Earth's surface

  1. Stratosphere, mesosphere, thermosphere, clouds

  2. Thermosphere, Troposphere, stratosphere, mesosphere

  3. Mesosphere, stratosphere, thermosphere, troposphere

  4. Troposphere, stratosphere, mesosphere, thermosphere
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The order of the atmosphere layers from the surface upward is the troposphere, stratosphere, mesosphere, and thermosphere.

Multiple choice evs - i interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

Ionosphere is also known as 

  1. Lithosphere

  2. Thermosphere

  3. Ozonosphere

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

The ionosphere is defined as the layer of the Earth's atmosphere that is ionized by solar and cosmic radiation. It lies 75 to 1000 km above the Earth. It is distinguished because it is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth. It is also called as thermosphere.

Multiple choice evs - i interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

The lower most layer of atmosphere in which man and other living organisms exist, is called as

  1. Mesosphere

  2. Stratosphere

  3. Trophosphere

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

The troposphere is the lowest layer of Earth's atmosphere and site of all weather on Earth. The troposphere is bonded on the top by a layer of air called as the tropopause, which separates the troposphere from the stratosphere, and on bottom by the surface of the Earth. It contains approximately 75% of the atmosphere's mass and 99% of its water vapour and aerosols. The average depth of the troposphere is approximately 17 km in the middle latitudes.

Multiple choice evs - i interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

Atmosphere comprises of

  1. Lithosphere and hydrosphere

  2. Lithosphere, hydrosphere, stratosphere and ionosphere

  3. Troposphere, stratosphere and ionosphere

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Atmospheric layers include the troposphere (0 to 16 km), stratosphere (16 to 50 km), mesosphere (50 to 80km) and thermosphere (80 to 640km). In the troposphere and mesosphere, temperature generally falls with increasing altitude, while in the stratosphere and thermosphere, temperature rises with increasing altitude. In addition to temperature, other criteria can be used to define different layers in the atmosphere. 

The ionosphere, which occupies the same region of the atmosphere as the thermosphere, is defined by the presence of ions, a physico-chemical criterion. 
The region beyond the ionosphere is known as the exosphere. The ionosphere and the exosphere together make up the upper atmosphere (or thermosphere). The magnetosphere is the region above the Earth's surface in which charged particles are affected by the Earth's magnetic field.

Multiple choice evs - i interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

The lower part of exosphere contains

  1. Carbon zone

  2. Ozone zone

  3. Nitrogen zone

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

Exosphere is the outer fringe of Earth's atmosphere, which extends some 20000 miles from the planet. It's dominant element is hydrogen and its temperature ranges from $200^0 F$ to $1000^0 F$. The lower part of exosphere contains abundance of helium besides hydrogen and is called as “helium zone”. Hence, option D is correct.

Multiple choice biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

Increase of temperature due to scattering of energy is by ozone, CO$ _2$ and water vapour, is known as

  1. Radioactivity

  2. Ozone effect

  3. Solar reaction

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

Global warming is the overheating of the earth due to the increased concentration of greenhouse gasses. Greenhouse gasses generally traps the radiations of the earth which leads to increase in the temperature of the earth and global warming. The greenhouse gasses includes water vapor, carbon dioxide, methane, nitrous oxide, and ozone. 

Multiple choice biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

Checking of radiating heat by atmospheric dust, O$ _3$, CO$ _2$ and water vapours is

  1. Greenhouse effect

  2. Solar effect

  3. Ozone layer effect

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

The concentration of oxides increases due to the high rate of emission from the vehicle and other human activities like deforestation. The oxides form a layer which traps solar radiation to escape the earth atmosphere which leads to global warming.

So, the correct answer is option A.

Multiple choice biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

Checking re-radiation of heat reflected by earth by CH$ _4$, CO$ _2$, O$ _3$ and chlorofluorocarbons is called as

  1. Green house effect

  2. Bohr's effect

  3. Pasteur's effect

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

The burning of fuels in the atmosphere leads to the formation of poisonous oxides and dioxides which push up the temperature of the earth and contributes to global warming. Clouds and gases reflect about one-fourth of the incoming solar radiation, and absorb some of it but almost half of incoming solar radiation falls on earth's surface heating it, while a small proportion is reflected back. Earth's surface re-emits heat in the form of infrared radiation but part of this does not escape into space as atmospheric gases (e.g., carbon dioxide, methane, etc.) absorb a major fraction of it. The molecules of these gases radiate heat energy, and a major part of which again comes to earth's surface, thus heating it up once again.The above-mentioned gases (carbon dioxide and methane) are commonly known as greenhouse gases because they are responsible for the greenhouse effect. 

So, the correct answer is option A.

Multiple choice biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

Green house effect is increasing due to

  1. Increasing $CO _2$ concentration
  2. Increasing $SO _2$ concentration

  3. Increasing concentration of chlorofluorocarbons

  4. Hole in ozone layer
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The higher concentration of carbon dioxide in the atmosphere is likely to increase the temperature as carbon dioxide permits the short wavelength visible radiations to pass through it but traps the longer wavelength infrared radiation reflected by earth's surface. This is called the greenhouse effect and it results in the overall increase in the global temperature, called global warming. Carbon dioxide contributes to the 81% of the greenhouse gases because it tends to persist in the atmosphere.

Hence, the correct answer is 'Increasing CO$ _{2}$ concentration'