Table of Contents
Structure and Composition of the Atmosphere – Small Introduction for MCQ
The Earth’s atmosphere is a vital envelope of gases that surrounds our planet, enabling life and influencing weather and climate. It is composed primarily of nitrogen and oxygen, along with trace gases such as carbon dioxide, argon, and water vapor. Structurally, the atmosphere is divided into several layers like the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Each characterized by temperature variations and unique phenomena. Understanding its structure and composition is essential in fields like meteorology, environmental science, and geography.
Here there are 25 Multiple Choice Questions (MCQs) on “Structure and Composition of the Atmosphere”
Let’s start the MCQ on Structure and Composition of the Atmosphere
01) Which of the following gas makes up the largest proportion of Earth’s atmosphere?
A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Argon
Correct answer is option “C”
02) What percentage of the atmosphere is composed of oxygen?
A) 78%
B) 21%
C) 0.03%
D) 1%
Correct answer is option “B”
03) Which of the following layer of the atmosphere contains the ozone layer?
A) Troposphere
B) Mesosphere
C) Thermosphere
D) Stratosphere
Correct answer is option “D”
04) In which of the following layer of the atmosphere does weather occur?
A) Troposphere
B) Mesosphere
C) Thermosphere
D) Exosphere
Correct answer is option “A”
05) Which of the following layer is the coldest part of the atmosphere?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere
Correct answer is option “C”
06) What is the correct option from the following for the approximate height of the troposphere at the equator?
A) 15 km
B) 18 km
C) 38 km
D) 58 km
Correct answer is option “B”
07) What is the function of the ozone layer from the following?
A) Absorbs ultraviolet radiation
B) Traps greenhouse gases
C) Facilitates precipitation
D) Reflects solar winds
Correct answer is option “A”
08) Which of the following gas is a greenhouse gas?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Helium
Correct answer is option “C”
09) What happens from the following to temperature if the altitude increases in the stratosphere?
A) Decreases
B) Increases
C) Remains constant
D) Drops to absolute zero
Correct answer is option “B”
10) Which of the following atmospheric layer lies just above the stratosphere?
A) Troposphere
B) Thermosphere
C) Mesosphere
D) Exosphere
Correct answer is option “C”
11) The exosphere merges into which of the following layer?
A) Mesosphere
B) Stratosphere
C) Thermosphere
D) Space
Correct answer is option “D”
12) Which of the following gases is found in trace amounts in the atmosphere?
A) Carbon dioxide
B) Nitrogen
C) Oxygen
D) Argon
Correct answer is option “A”
13) What is the average height of the stratosphere from the Earth’s surface from the following?
A) 85-500 km
B) 50-85 km
C) 10-50 km
D) 0-10 km
Correct answer is option “C”
14) Which of the following layer has the highest temperatures due to absorption of solar radiation?
A) Troposphere
B) Thermosphere
C) Stratosphere
D) Mesosphere
Correct answer is option “B”
15) Which of the following instrument used to measure atmospheric pressure?
A) Thermometer
B) Barometer
C) Anemometer
D) Hygrometer
Correct answer is option “B”
16) Which of the following is NOT a characteristic of the troposphere?
A) Contains most weather phenomena
B) Contains the ozone layer
C) Decrease in temperature with height
D) Most dense layer
Correct answer is option “B”
17) Which of the following element is not the part of the major components of dry air?
A) Nitrogen
B) Oxygen
C) Carbon dioxide
D) Hydrogen
Correct answer is option “D”
18) Which of the following gas is most responsible for absorbing Earth’s outgoing infrared radiation?
A) Nitrogen
B) Oxygen
C) Greenhouse gases
D) Argon
Correct answer is option “C”
19) What is the name of the atmospheric layer from the following where satellites are orbit?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere
Correct answer is option “D”
20) Which of the following layer is responsible for reflecting radio waves back to Earth?
A) Ionosphere
B) Mesosphere
C) Exosphere
D) Troposphere
Correct answer is option “A”
21) Which of the following gas is primarily responsible for the greenhouse effect?
A) Oxygen
B) Carbon dioxide
C) Methane
D) Nitrogen
Correct answer is option “B”
22) The boundary between the troposphere and stratosphere is called________.
A) Stratopause
B) Mesopause
C) Thermopause
D) Tropopause
Correct answer is option “D”
23) Which of the following layer protects Earth from meteoroids by burning them up?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere
Correct answer is option “C”
24) The atmosphere becomes thinner with which of the following option?
A) Increase in altitude
B) Decrease in altitude
C) Increase in temperature
D) Increase in pressure
Correct answer is option “A”
25) What is the appx total height of the Earth’s atmosphere where it blends into space?
A) 500 km
B) 1000 km
C) 9,000 km
D) Over 10,000 km
Correct answer is option “D”
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