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Tuesday, February 5, 2019

NCERT CLASS 7 SOCIAL SCIENCE GEOGRAPHY CHAPTER-4 Air

Important questions with answers.



1.      What is the percentage composition of Nitrogen, Oxygen, Argon and Carbon dioxide in the atmosphere?
 Answer: Th percentage composition of Nitrogen, Oxygen, Argon and Carbon dioxide in the atmosphere is given below:
                   Nitrogen: 78%
                   Oxygen: 21 %
                    Argon: 0.93%
                    Carbon dioxide: 0.03 %
2.      What are the five layers of the atmosphere?
 Answer: The five layers of the atmosphere are:
                  Troposphere,
                  Stratosphere,
                  Mesosphere,
                  Thermosphere and
                  Exosphere.

3.      Which layer of the atmosphere is ideal for flying aeroplanes?
 Answer: Stratosphere is the layer in the atmosphere which is ideal for flying aeroplanes.

4.      Name the layer in the atmosphere which contains the ozone gas.
 Answer:  Stratosphere is the layer in the atmosphere which contains the ozone gas.

5.      Name the layer in the atmosphere where meteorites burn upon entering from space.
 Answer: Mesosphere is the layer in the atmosphere where meteorites burn upon entering from space.

6.      In which layer of the atmosphere radio waves transmitted from the earth are reflected back to the earth?
 Answer: Thermosphere is the layer in the atmosphere where radio waves transmitted from the earth are reflected back to the earth.

7.      What is the standard unit of measuring temperature? Who invented it?
 Answer: The standard unit of measuring temperature is degree Celsius. It was invented by Anders Celsius.

8.      What are the three types of winds?
 Answer: The three types of winds are 
                  Permanent winds,
                  Seasonal winds and 
                  Local winds.
9.      What are the three types of rainfall?
 Answer: The three types of rainfall are
                   Cyclonic rainfall,
                   Relief or Orographic rainfall and
                   Convectional rainfall.

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