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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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