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 evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

All of the followings are atmospheric layers except.

  1. Mesosphere

  2. Troposphere

  3. Asthenosphere

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

The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 80% of the atmosphere's mass. 

In the mesosphere, temperature decreases with increasing height. The stratosphere is the second major layer of Earth's atmosphere, just above the troposphere and below the mesosphere. It is stratified in temperature, with warmer layers higher up and cooler layers farther down. The thermosphere is the layer of the Earth's atmosphere directly above the mesosphere and directly below the exosphere. Within this layer, ultraviolet radiation (UV) causes ionization. 

The asthenosphere is the highly viscous region of the upper mantle of the Earth. It lies below the lithosphere, at depths between approximately 80 and 200 km below the surface.
Thus, the correct answer is option C.

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Which of the following layers of the atmosphere consists artificial satellites?

  1. Exosphere

  2. Thermosphere

  3. Troposphere

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

Artificial satellites orbit the Earth in the thermosphere and exosphere. Among the choices provided, the thermosphere is the correct region where many low Earth orbit satellites are located.

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Ozone makes the stratosphere :

  1. Cooler by $17^o C $
  2. Warmer by $17^o C $
  3. Warmer by $53^o C $
  4. Cooler by $50^o C $
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ozone in the stratosphere absorbs ultraviolet radiation from the sun, which converts that energy into heat. This process makes the stratosphere warmer by approximately 53 degrees Celsius compared to the temperature at the tropopause.

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Which organisms changed earth's atmosphere from reducing to oxidising?

  1. Chemoautotrophs

  2. Bacterial photoautotrophs

  3. Blue-green algae/ oxygenic photoautotrophs

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

Cyanobacteria, also known as blue-green algae, were the first organisms to perform oxygenic photosynthesis. This process released oxygen as a byproduct, eventually leading to the Great Oxidation Event.

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Atmospheric layer protective to living beings from harmful rays is :

  1. Mesosophere

  2. Ozonosphere

  3. Thermosphere

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The ozonosphere (ozone layer) in the stratosphere protects life from harmful UV radiation. The thermosphere also absorbs high-energy X-rays and gamma rays, providing additional protection. Both layers contribute to shielding Earth from dangerous solar and cosmic radiation.

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Ionosphere is between :

  1. Stratosphere and mesosphere

  2. Mesosphere and thermosphere

  3. Troposphere and stratosphere

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

The ionosphere is an ionized region of the upper atmosphere that overlaps with the mesosphere and thermosphere, typically situated between them.

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Ionosphere occurs in

  1. Thermosphere

  2. Homosphere

  3. Mesosphere

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

The ionosphere is not another atmospheric layer. It occupies the same region of the upper atmosphere as the thermosphere. In this region of the atmosphere the Sun's energy is so strong that it breaks apart molecules and atoms of air, leaving ions. So the correct answer is 'Thermosphere'.

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Ozonosphere is component of

  1. Troposphere

  2. Stratosphere

  3. Mesosphere

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

Troposphere is the layer where all weather occurs. this is the lowest layer.

Above the troposphere lies the stratosphere where temperatures increase with altitude because of increasing amounts of ozone. The ozone layer within the stratosphere absorbs harmful ultraviolet rays of sunlight. After that comes mesosphere and thermosphere. So the correct answer is 'Stratosphere '

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Which one is nearly absent in ozonosphere?

  1. Dust particles

  2. Water vapours
  3. CO$ _2$

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

The Ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. It contains high concentrations of ozone (O3) in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere. As the ozonosphere only contains high levels of ozone gas, therefore all the other things such as the dust particles. water vapours and CO2 are absent from it. 

So, the correct answer is 'All of the above. '

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Mesosphere is component of

  1. Atmosphere

  2. Hydrosphere

  3. Lithosphere

  4. Both A and B
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Earth's atmosphere is divided into five main layers: the exosphere, the thermosphere, the mesosphere, the stratosphere and the troposphere. Therefore mesosphere is the second most layer of the atmosphere measure from the surface of the earth and is therefore a component of the atmosphere. The mesosphere is directly above the stratosphere and below the thermosphere. It extends from about 50 to 85 km (31 to 53 miles) above our planet.
So, the correct answer is 'Atmosphere'.
Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Which layer of atmosphere is important for telecommunications?

  1. Troposphere

  2. Ozonosphere

  3. Mesosphere

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

The thermosphere contains the ionosphere, which reflects radio waves back toward Earth and enables long-distance telecommunications and broadcasting. The other layers do not possess this key radio-wave reflecting property to the same extent.