MCQ
Page Ref: Page 64
The atmosphere is mainly composed of:
A. Only oxygen
B. Mixture of gases
C. Only nitrogen
D. Water vapour only
Correct Answer / Reference:
Option: B. Mixture of gases
Reference: Found on Page Page 64
MCQ
Page Ref: Page 64
Approximately 99 per cent of atmospheric mass is confined within:
A. 10 km
B. 20 km
C. 32 km
D. 100 km
Correct Answer / Reference:
Option: C. 32 km
Reference: Found on Page Page 64
MCQ
Page Ref: Page 64
Which gas is essential for respiration in humans and animals?
A. Carbon dioxide
B. Oxygen
C. Nitrogen
D. Helium
Correct Answer / Reference:
Option: B. Oxygen
Reference: Found on Page Page 64
MCQ
Page Ref: Page 64
Carbon dioxide is important because it:
A. Blocks all solar radiation
B. Causes earthquakes
C. Produces greenhouse effect
D. Creates ozone layer only
Correct Answer / Reference:
Option: C. Produces greenhouse effect
Reference: Found on Page Page 64
MCQ
Page Ref: Page 64
Which gas is transparent to incoming solar radiation but opaque to outgoing terrestrial radiation?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Helium
Correct Answer / Reference:
Option: C. Carbon dioxide
Reference: Found on Page Page 64
MCQ
Page Ref: Page 64
The increase in atmospheric carbon dioxide is mainly due to:
A. Earthquakes
B. Ocean tides
C. Burning of fossil fuels
D. Volcanic ash only
Correct Answer / Reference:
Option: C. Burning of fossil fuels
Reference: Found on Page Page 64
MCQ
Page Ref: Page 64
The ozone layer is mainly located between:
A. 0–5 km
B. 10–50 km
C. 60–80 km
D. 100–150 km
Correct Answer / Reference:
Option: B. 10–50 km
Reference: Found on Page Page 64
MCQ
Page Ref: Page 64
The ozone layer protects Earth from:
A. Infrared rays
B. Radio waves
C. Ultra-violet rays
D. Cosmic dust only
Correct Answer / Reference:
Option: C. Ultra-violet rays
Reference: Found on Page Page 64
MCQ
Page Ref: Page 64
Water vapour in the atmosphere mainly acts like a:
A. Mirror
B. Blanket
C. Barrier wall
D. Magnetic shield
Correct Answer / Reference:
Option: B. Blanket
Reference: Found on Page Page 64
MCQ
Page Ref: Page 64
Water vapour decreases from:
A. Poles to equator
B. Equator to poles
C. Oceans to mountains only
D. Plains to deserts only
Correct Answer / Reference:
Option: B. Equator to poles
Reference: Found on Page Page 64
MCQ
Page Ref: Page 65
Dust particles in the atmosphere act as:
A. Heat producers only
B. Hygroscopic nuclei
C. Ozone generators
D. Wind barriers
Correct Answer / Reference:
Option: B. Hygroscopic nuclei
Reference: Found on Page Page 65
MCQ
Page Ref: Page 65
Which atmospheric layer contains most weather phenomena?
A. Mesosphere
B. Stratosphere
C. Troposphere
D. Exosphere
Correct Answer / Reference:
Option: C. Troposphere
Reference: Found on Page Page 65
MCQ
Page Ref: Page 65
The average height of troposphere is about:
A. 5 km
B. 13 km
C. 32 km
D. 50 km
Correct Answer / Reference:
Option: B. 13 km
Reference: Found on Page Page 65
MCQ
Page Ref: Page 65
The thickness of troposphere is greatest near:
A. Poles
B. Tropics only
C. Equator
D. Temperate regions
Correct Answer / Reference:
Option: C. Equator
Reference: Found on Page Page 65
MCQ
Page Ref: Page 65
Temperature in troposphere decreases at the rate of:
A. 1°C per 100 m
B. 1°C per 165 m
C. 2°C per 100 m
D. 6°C per 1000 m only
Correct Answer / Reference:
Option: B. 1°C per 165 m
Reference: Found on Page Page 65
MCQ
Page Ref: Page 65
The boundary between troposphere and stratosphere is called:
A. Mesopause
B. Tropopause
C. Thermopause
D. Exobase
Correct Answer / Reference:
Option: B. Tropopause
Reference: Found on Page Page 65
MCQ
Page Ref: Page 65
Which atmospheric layer contains ozone layer?
A. Troposphere
B. Stratosphere
C. Mesosphere
D. Exosphere
Correct Answer / Reference:
Option: B. Stratosphere
Reference: Found on Page Page 65
MCQ
Page Ref: Page 65
The mesosphere extends up to about:
A. 50 km
B. 80 km
C. 120 km
D. 400 km
Correct Answer / Reference:
Option: B. 80 km
Reference: Found on Page Page 65
MCQ
Page Ref: Page 65
The ionosphere contains electrically charged particles called:
A. Molecules
B. Nuclei
C. Ions
D. Vapours
Correct Answer / Reference:
Option: C. Ions
Reference: Found on Page Page 65
MCQ
Page Ref: Page 65
Radio waves are reflected back to Earth by:
A. Troposphere
B. Mesosphere
C. Ionosphere
D. Exosphere
Correct Answer / Reference:
Option: C. Ionosphere
Reference: Found on Page Page 65
MCQ
Page Ref: Page 66
The uppermost atmospheric layer is:
A. Stratosphere
B. Mesosphere
C. Thermosphere
D. Exosphere
Correct Answer / Reference:
Option: D. Exosphere
Reference: Found on Page Page 66
MCQ
Page Ref: Page 65
Which layer is most important for biological activity?
A. Exosphere
B. Mesosphere
C. Troposphere
D. Thermosphere
Correct Answer / Reference:
Option: C. Troposphere
Reference: Found on Page Page 65
MCQ
Page Ref: Page 65
Dust particles are highly concentrated in:
A. Upper atmosphere only
B. Equatorial regions only
C. Lower atmosphere
D. Exosphere only
Correct Answer / Reference:
Option: C. Lower atmosphere
Reference: Found on Page Page 65
MCQ
Page Ref: Page 65
The temperature at mesopause reaches approximately:
A. 0°C
B. –20°C
C. –100°C
D. 100°C
Correct Answer / Reference:
Option: C. –100°C
Reference: Found on Page Page 65
MCQ
Page Ref: Page 66
The atmosphere gradually merges with outer space in:
A. Troposphere
B. Thermosphere
C. Exosphere
D. Mesosphere
Correct Answer / Reference:
Option: C. Exosphere
Reference: Found on Page Page 66
MCQ
Page Ref: Page 64
Which atmospheric component is highly variable?
A. Nitrogen
B. Oxygen
C. Water vapour
D. Argon
Correct Answer / Reference:
Option: C. Water vapour
Reference: Found on Page Page 64
MCQ
Page Ref: Page 65
Which atmospheric layer is directly responsible for weather and climate changes?
A. Stratosphere
B. Troposphere
C. Mesosphere
D. Exosphere
Correct Answer / Reference:
Option: B. Troposphere
Reference: Found on Page Page 65
MCQ
Page Ref: Page 65
Convectional currents are strongest near:
A. Poles
B. Equator
C. Mesosphere
D. Exosphere
Correct Answer / Reference:
Option: B. Equator
Reference: Found on Page Page 65
MCQ
Page Ref: Page 64
Which gas quantity becomes negligible at about 120 km height?
A. Nitrogen
B. Carbon dioxide
C. Oxygen
D. Ozone
Correct Answer / Reference:
Option: C. Oxygen
Reference: Found on Page Page 64
MCQ
Page Ref: Page 66
Which among the following is NOT an element of weather and climate?
A. Humidity
B. Winds
C. Pressure
D. Minerals
Correct Answer / Reference:
Option: D. Minerals
Reference: Found on Page Page 66