The Atmosphere

Total Questions: 23

11. The stratosphere is said to be ideal for flying jet aircraft. This is because- [Jharkhand P.C.S. (Pre) 2010]

Correct Answer: (d) The absence of clouds and other weather phenomena
Solution:The stratosphere is the second major layer of Earth's atmosphere, just above the troposphere, and below the mesosphere. The stratosphere is very dry and air of this layer contains little water vapour.

Because of this, Stratosphere is almost free from clouds and associated weather phenomenon. These conditions are ideal in order to avoid disturbances. Jet aircraft use to fly in this layer.

12. The ozone layer lies in the: [Chhattisgarh P.C.S. (Pre) 2011 Uttarakhand P.C.S. (Pre) 2010 U.P.P.C.S. (Pre) 1997]

Correct Answer: (c) Stratosphere
Solution:The ozone layer is mainly found in the lower portion of the stratosphere from 15 to 35 kilometres above Earth. The maximum height of this layer is 55 kilometre but the maximum concentration of ozone layer is found from 15 to 35 kilometer.

This layer absorbs ultra-violet radiation and shields life on the Earth from an intense and harmful form of energy. Ultra-violet rays may cause skin cancer

13. The Ozone layer lies in the - [U.P.P.C.S. (Mains) 2003,2005]

Correct Answer: (c) Stratosphere
Solution:The ozone layer is mainly found in the lower portion of the stratosphere from 15 to 35 kilometres above Earth. The maximum height of this layer is 55 kilometre but the maximum concentration of ozone layer is found from 15 to 35 kilometer.

This layer absorbs ultra-violet radiation and shields life on the Earth from an intense and harmful form of energy. Ultra-violet rays may cause skin cancer

14. Which of the following protects life on earth from the harmful radiations of the Sun ? [Chhattisgarh P.C.S (Pre) 2013]

Correct Answer: (c) Ozone layer
Solution:The ozone layer protects us from the harmful ultra-violet radiations of the Sun. In atmosphere, it is mainly found in the lower portion of the Stratosphere from 15-35 km above Earth. Ozone is a molecule composed of three oxygen atoms. Its colour is blue.

15. The function of the ozone layer in the stratosphere is- [Uttarakhand P.C.S. (Pre) 2002]

Correct Answer: (d) To prevent ultraviolet radiation effect on the ground
Solution:The Ozone Layer describes the protective layer of naturally occurring gas found about 10-50 km above the earth's surface. It protects us from harmful ultraviolet radiation. Ninety percent of the ozone in the atmosphere is in the Stratosphere, and 10 percent is in the Troposphere.

The ozone in the stratosphere is commonly known as the ozone layer. The total amount of Ozone in the Ozone Layer varies with location on the time scales that range from daily to seasonal.

Stratospheric winds, chemical production, and ozone destruction cause the variations. Because of the seasonal wind patterns in the stratosphere, total ozone is generally lowest at the equator and highest near the poles. Ozone Layer Depletion refers to the thinning the Ozone layer in the Earth's Stratosphere.

Ozone layer depletion is a thermodynamically unstable gas that readily decomposes into molecular oxygen. Normally, a dynamic equilibrium exists between the production and decomposition of ozone molecules. Ozone layer depletion occurs when this balance of stratospheric ozone is tipped in favour of destruction.

16. Ozone layer refers to - [38th B.P.S.C. (Pre) 1992]

Correct Answer: (d) The layer of atmosphere of 15-20 km. above the surface of Earth
Solution:The Ozone Layer describes the protective layer of naturally occurring gas found about 10-50 km above the earth's surface. It protects us from harmful ultraviolet radiation. Ninety percent of the ozone in the atmosphere is in the Stratosphere, and 10 percent is in the Troposphere.

The ozone in the stratosphere is commonly known as the ozone layer. The total amount of Ozone in the Ozone Layer varies with location on the time scales that range from daily to seasonal.

Stratospheric winds, chemical production, and ozone destruction cause the variations. Because of the seasonal wind patterns in the stratosphere, total ozone is generally lowest at the equator and highest near the poles. Ozone Layer Depletion refers to the thinning the Ozone layer in the Earth's Stratosphere.

Ozone layer depletion is a thermodynamically unstable gas that readily decomposes into molecular oxygen. Normally, a dynamic equilibrium exists between the production and decomposition of ozone molecules. Ozone layer depletion occurs when this balance of stratospheric ozone is tipped in favour of destruction.

17. The height of the ozone layer above the surface of the earth is- [41st B.P.S.C. (Pre) 1996]

Correct Answer: (a) 15-20 km
Solution:The Ozone Layer describes the protective layer of naturally occurring gas found about 10-50 km above the earth's surface. It protects us from harmful ultraviolet radiation. Ninety percent of the ozone in the atmosphere is in the Stratosphere, and 10 percent is in the Troposphere.

The ozone in the stratosphere is commonly known as the ozone layer. The total amount of Ozone in the Ozone Layer varies with location on the time scales that range from daily to seasonal.

Stratospheric winds, chemical production, and ozone destruction cause the variations. Because of the seasonal wind patterns in the stratosphere, total ozone is generally lowest at the equator and highest near the poles. Ozone Layer Depletion refers to the thinning the Ozone layer in the Earth's Stratosphere.

Ozone layer depletion is a thermodynamically unstable gas that readily decomposes into molecular oxygen. Normally, a dynamic equilibrium exists between the production and decomposition of ozone molecules. Ozone layer depletion occurs when this balance of stratospheric ozone is tipped in favour of destruction.

18. Which one of the following layers of the atmosphere is responsible for the deflection of radio waves? [U.P.P.C.S. (Mains) 2005 I.A.S. (Pre) 1996]

Correct Answer: (d) Ionosphere
Solution:Radio waves are reflected by the lonosphere. Other major events that occur in this region are as follows- Identification of cosmic rays and observation of Aurora Borealis and Aurora Australis.

19. Which layer of atmosphere is responsible for Aurora Borealis? [U.P.P.C.S (PRE) 2010]

Correct Answer: (c) Ionosphere
Solution:Aurora is an incredible light caused by collisions between electrically charged particles released from the Sun that Southern Hemisphere is called "Aurora Australis.

The light enter the Earth atmosphere Aurora that occurs in the Northern Hemisphere is called "Aurora Borealis and of Aurora extends from (80 Km to 640 Km). So Ionosphere is responsible for Aurora Borealis.

20. Wireless communication is reflected to the earth's surface by- [UP.P.C.S.(Pre) 2013]

Correct Answer: (c) lonosphere
Solution:The Ionosphere is composed of electrically charged particles that are called 'ions'. These particles reflect radio waves back to the Earth surface and enable us to have wireless communication.