MCQs on the Exosphere – World Geography
Q1. The exosphere is the __ layer of Earth’s atmosphere.
a) Lowest
b) Second lowest
c) Third lowest
d) Highest
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Correct Answer: d) Highest
Explanation: The exosphere is the highest layer of Earth’s atmosphere, located above the thermosphere.
Q2. The exosphere primarily consists of:
a) Nitrogen and oxygen
b) Oxygen and carbon dioxide
c) Nitrogen and argon
d) Hydrogen and helium
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Correct Answer: d) Hydrogen and helium
Explanation: The exosphere primarily consists of hydrogen and helium, with trace amounts of other gases.
Q3. The boundary between the thermosphere and the exosphere is called the:
a) Tropopause
b) Stratopause
c) Mesopause
d) Thermopause
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Correct Answer: d) Thermopause
Explanation: The thermopause is the boundary between the thermosphere and the exosphere, where the temperature stops increasing with altitude and starts decreasing.
Q4. The exosphere extends from approximately __ kilometers above Earth’s surface.
a) 85 to 600
b) 600 to 10,000
c) 10,000 to 100,000
d) 100,000 to 1,000,000
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Correct Answer: b) 600 to 10,000
Explanation: The exosphere extends from approximately 600 to 10,000 kilometers (373 to 6,214 miles) above Earth’s surface, located above the thermosphere.
Q5. The exosphere is characterized by:
a) High air pressure
b) Low air pressure
c) No air pressure
d) Variable air pressure
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Correct Answer: b) Low air pressure
Explanation: The exosphere is characterized by extremely low air pressure due to the sparse distribution of gas molecules at such high altitudes.
Q6. The temperature in the exosphere generally:
a) Increases with altitude
b) Decreases with altitude
c) Remains constant with altitude
d) Varies unpredictably with altitude
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Correct Answer: a) Increases with altitude
Explanation: The temperature in the exosphere generally increases with altitude due to the absorption of solar radiation by the sparse gas molecules.
Q7. The primary function of the exosphere is to:
a) Absorb ultraviolet radiation
b) Protect Earth from meteoroids
c) Act as a transition zone to outer space
d) Regulate Earth’s climate
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Correct Answer: c) Act as a transition zone to outer space
Explanation: The exosphere acts as a transition zone between Earth’s atmosphere and outer space, with gas molecules gradually becoming more dispersed as altitude increases.
Q8. The air density in the exosphere is:
a) Higher than in the troposphere
b) Lower than in the troposphere
c) The same as in the troposphere
d) Higher than in the stratosphere
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Correct Answer: b) Lower than in the troposphere
Explanation: The air density in the exosphere is much lower than in the troposphere due to the decreasing number of gas molecules at higher altitudes.
Q9. The exosphere is primarily heated by:
a) Direct sunlight
b) The Earth’s surface
c) The Earth’s core
d) The stratosphere
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Correct Answer: a) Direct sunlight
Explanation: The exosphere is primarily heated by direct sunlight, as it absorbs solar radiation and re-emits it as infrared radiation.
Q10. The exosphere is characterized by:
a) Vertical mixing
b) Horizontal mixing
c) No mixing
d) Both vertical and horizontal mixing
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Correct Answer: c) No mixing
Explanation: The exosphere is characterized by no mixing, as the gas molecules are so sparse that they rarely collide with one another.
Q11. The exosphere is important for:
a) Weather patterns
b) Climate regulation
c) Satellite orbits
d) Ozone layer protection
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Correct Answer: c) Satellite orbits
Explanation: The exosphere is important for satellite orbits, as the low air density minimizes drag and allows for stable orbits.
Q12. The air pressure in the exosphere is:
a) Higher than in the troposphere
b) Lower than in the troposphere
c) The same as in the troposphere
d) Higher than in the stratosphere
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Correct Answer: b) Lower than in the troposphere
Explanation: The air pressure in the exosphere is much lower than in the troposphere due to the decreasing number of gas molecules at higher altitudes.
Q13. The exosphere is primarily composed of which two gases?
a) Nitrogen and oxygen
b) Oxygen and carbon dioxide
c) Nitrogen and argon
d) Hydrogen and helium
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Correct Answer: d) Hydrogen and helium
Explanation: The exosphere is primarily composed of hydrogen and helium, with trace amounts of other gases.
Q14. The temperature in the exosphere can reach up to:
a) 500°C (932°F)
b) 1,000°C (1,832°F)
c) 2,500°C (4,532°F)
d) 5,000°C (9,032°F)
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Correct Answer: b) 1,000°C (1,832°F)
Explanation: The temperature in the exosphere can reach up to 1,000°C (1,832°F) due to the absorption of solar radiation by the sparse gas molecules.
Q15. The exobase is the boundary between which two layers of the atmosphere?
a) Troposphere and stratosphere
b) Stratosphere and mesosphere
c) Mesosphere and thermosphere
d) Thermosphere and exosphere
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Correct Answer: d) Thermosphere and exosphere
Explanation: The exobase is the boundary between the thermosphere and the exosphere, where the gas molecules become so sparse that they can escape into outer space.
Q16. The exosphere is the region of the atmosphere where:
a) Weather occurs
b) Ozone layer is located
c) Meteors burn up
d) Satellites orbit
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Correct Answer: d) Satellites orbit
Explanation: The exosphere is the region of the atmosphere where satellites orbit, as the low air density minimizes drag and allows for stable orbits.
Q17. The exosphere is the region of the atmosphere where:
a) The Earth’s magnetic field is strongest
b) The Earth’s magnetic field is weakest
c) The Earth’s magnetic field has no effect
d) The Earth’s magnetic field is variable
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Correct Answer: b) The Earth’s magnetic field is weakest
Explanation: The exosphere is the region of the atmosphere where the Earth’s magnetic field is weakest, as the gas molecules are so sparse that they have little interaction with the magnetic field)
Q18. The exosphere is the region of the atmosphere where:
a) The Earth’s gravity is strongest
b) The Earth’s gravity is weakest
c) The Earth’s gravity has no effect
d) The Earth’s gravity is variable
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Correct Answer: b) The Earth’s gravity is weakest
Explanation: The exosphere is the region of the atmosphere where the Earth’s gravity is weakest, as the gas molecules are so sparse that they can escape into outer space.
Q19. The exosphere is the region of the atmosphere where:
a) The Earth’s atmosphere merges with outer space
b) The Earth’s atmosphere is thickest
c) The Earth’s atmosphere is most turbulent
d) The Earth’s atmosphere is most stable
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Correct Answer: a) The Earth’s atmosphere merges with outer space
Explanation: The exosphere is the region of the atmosphere where the Earth’s atmosphere merges with outer space, as the gas molecules become so sparse that they can escape into outer space.
Q20. The exosphere is the region of the atmosphere where:
a) The Earth’s atmosphere is most dense
b) The Earth’s atmosphere is least dense
c) The Earth’s atmosphere is most stratified
d) The Earth’s atmosphere is most turbulent
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Correct Answer: b) The Earth’s atmosphere is least dense
Explanation: The exosphere is the region of the atmosphere where the Earth’s atmosphere is least dense, as the gas molecules are so sparse that they rarely collide with one another.