MCQ Questions for Class 11 Geography Chapter 8 Composition and Structure of Atmosphere with Answers

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Composition and Structure of Atmosphere Class 11 MCQs Questions with Answers

I. Choose the correct answer

Question 1.
Atmosphere contains
(a) oxygen
(b) nitrogen
(c) dust particles
(d) all of them

Answer

Answer: (d) all of them


Question 2.
Which gas is essential for breathing?
(a) nitrogen
(b) oxygen
(c) carbon dioxide
(d) none of these

Answer

Answer: (b) oxygen


Question 3.
What is the percentage of air in the atmosphere?
(a) 32
(b) 99
(c) 0.1
(d) 21

Answer

Answer: (b) 99


Question 4.
At what height will oxygen be almost in negligible quantity?
(a) 120 km.
(b) 90 km.
(c) 18 km.
(d) 60 km.

Answer

Answer: (a) 120 km.


Question 5.
What is the % of nitrogen in the atmosphere?
(a) 20.95%
(b) 78.08%
(c) 20%
(d) 80%

Answer

Answer: (b) 78.08%.


Question 6.
Which gas is present in large amount in the atmosphere?
(a) oxygen
(b) hydrogen
(c) nitrogen
(d) carbon dioxide

Answer

Answer: (c) nitrogen.


Question 7.
Name the gas which is useful for plants
(a) oxygen
(b) carbon dioxide
(c) argon
(d) hydrogen

Answer

Answer: (b) carbon dioxide.


Question 8.
Which gas is found as a trace in the atmosphere?
(a) oxygen
(b) nitrogen
(c) carbon dioxide
(d) xenon

Answer

Answer: (d) xenon.


Question 9.
What percentage of carbon dioxide is found in air?
(a) 0.036%
(b) 0.93%
(c) 0.002%
(d) 0,3%

Answer

Answer: (a) 0.036%.


Question 10.
What percentage of oxygen is found in the air?
(a) 20.95
(b) 21.95
(c) 78.08
(d) 80.08

Answer

Answer: (a) 20.95.


Question 11.
Which gas acts as a filter and protects us from the ultra violet rays?
(a) oxygen
(b) nitrogen
(c) ozone
(d) carbon dioxide

Answer

Answer: (c) ozone.


Question 12.
Which layer of the atmosphere is useful for various biological activities?
(a) stratosphere
(b) troposphere
(c) ionosphere
(d) none of these

Answer

Answer: (b) troposphere.


Question 13.
Which one is the variable gas in the atmosphere?
(a) carbon dioxide
(b) water vapour
(c) dust particles
(d) smoke

Answer

Answer: (b) water vapour.


Question 14.
Which layer of the atmosphere is free from water vapours and clouds?
(a) troposphere
(b) stratosphere
(c) mesosphere
(d) exosphere

Answer

Answer: (b) stratosphere.


Question 15.
The zone separating troposphere from stratosphere is known as
(a) tropopause
(b) stratopause
(c) mesopause
(d) none of these

Answer

Answer: (a) tropopause.


Question 16.
Upto what height does the stratosphere extend?
(a) 60 km.
(b) 80 km.
(c) 50 km.
(d) 120 km.

Answer

Answer: (c) 50 km.


Question 17.
The mesosphere lies above the
(a) troposphere
(b) stratosphere
(c) ionosphere
(d) exosphere

Answer

Answer: (b) stratosphere.


Question 18.
The upper limit of mesosphere is known as
(a) tropopause
(b) mesopause
(c) stratopause
(d) exopause

Answer

Answer: (b) mesopause.


Question 19.
Ionosphere is located between
(a) 80 and 400 km.
(b) 80 and 500 km.
(c) 40 and 400 km.
(d) 40 and 200 km.

Answer

Answer: (a) 80 and 400 km.


Question 20.
Radio waves are transmitted from which layer?
(a) mesosphere
(b) exosphere
(c) ionosphere
(d) none of These

Answer

Answer: (c) ionosphere.


Question 21.
Chief elements of the atmosphere are
(a) wind
(b) temperature
(c) pressure
(d) all of them

Answer

Answer: (d) all of them.


Question 22.
Atmospheric elements are controlled by
(a) latitude
(b) altitude
(c) land
(d) all of them

Answer

Answer: (d) all of them.


II. Fill up the blanks with suitable words

Question 1.
The …………… is essential for various organisms.

Answer

Answer: air


Question 2.
Atmosphere is a mixture of different ……………. and it ………….. the earth all round.

Answer

Answer: gases, envelopes


Question 3.
The air is ……………, …………… and ……………

Answer

Answer: colourless, odourless, tasteless


Question 4.
Carbon dioxide and water vapour are not found starting from …………….. and above.

Answer

Answer: 90 km.


Question 5.
Carbon dioxide is largely responsible for the …………….. effect.

Answer

Answer: green house


Question 6.
Ozone acts as a ……………. and …………….. the ……………… rays.

Answer

Answer: filter, absorbs, ultraviolet


Question 7.
……………… also decreases front the equator towards the poles.

Answer

Answer: Water vapour


Question 8.
Dust particles are concentrated in the ……………… of the atmosphere.

Answer

Answer: lower layer


Question 9.
The column of atmosphere is divided into …………. different layers depending upon temperature conditions.

Answer

Answer: five


Question 10.
Radio waves are transmitted from the …………….

Answer

Answer: Ionosphere


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