The Atmosphere

21. Which layer of Atmosphere is used for Telecommunication? [Jharkhand P.C.S. (Pre) 2013]

(a) Troposphere
(b) Thermosphere
(c) Stratosphere
(d) lonosphere

Correct Answer: (d) 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

22. In which atmospheric layer are communication satellites located? [Uttarakhand P.C.S. (Pre) 2005]

(a) Exosphere
(b) Stratosphere
(c) Ionosphere
(d) Troposphere

Correct Answer: (a) Exosphere

Solution:Geostationary satellites are positioned at approximately 36000 km height above the Earth. Exosphere is the outer limit of the atmosphere above 640 km from the Earth. Therefore, the communication satellite located in outer most layer of the atmosphere are in Exosphere.

23. Which of the following are correct in matching the layer of atmosphere and its characteristics? [U.P.P.C.S. (Mains) 2002]

Layer	Feature
1. Troposphere	Weather Phenomena
2. Stratosphere	Ozone layer
3. Ionosphere	Radio waves reflected to Earth's surface
4. Mesosphere	Aurorae

(a) 1, 2, 3 and 4
(b) 1, 2 and 4
(c) 1, 2, and 3
(d) 2 and 3

Correct Answer: (c) 1, 2, and 3

Solution:Almost all the weather phenomena like rainfall, fog and hailstorm etc. occur in troposphere. 19 થ Stratosphere - contains a layer of ozone gas. Radio waves transmitted from the earth are reflected back to the Earth by Ionosphere. Auroras are also related to this layer. So, option 1,2 and 3 are correctly matched, while option (4) is incorrect.

The Atmosphere

21. Which layer of Atmosphere is used for Telecommunication? [Jharkhand P.C.S. (Pre) 2013]

22. In which atmospheric layer are communication satellites located? [Uttarakhand P.C.S. (Pre) 2005]

23. Which of the following are correct in matching the layer of atmosphere and its characteristics? [U.P.P.C.S. (Mains) 2002]

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