Atmosphere

Total Questions: 29

21. The layer where the decrease in temperature with increasing altitude is totally absent is- [S.SC. Online C.G.L.(T-1) 1.09.2016 (Shift-III]

Correct Answer: (c) Stratosphere
Solution:

The layer of the atmosphere where the decrease in temperature with increasing altitude is totally absent is the stratosphere.

Stratosphere: Key Characteristics

  1. Altitude range: ~15 km to 50 km above Earth’s surface

  2. Temperature trend:
    :-Unlike the troposphere, temperature increases with altitude in the stratosphere.
    :-This temperature inversion is due to the ozone layer, which absorbs ultraviolet (UV) radiation and warms the air.

Summary of Temperature Trends by Atmospheric Layer:

LayerTemperature Trend with Altitude
TroposphereDecreases
StratosphereIncreases (no decrease)
MesosphereDecreases again
ThermosphereIncreases dramatically

22. The outermost layer of the earth's atmosphere is [S.S.C. Online CHSL (T-I) 2.02.2017(Shift-I)]

Correct Answer: (d) exosphere
Solution:The exosphere is the outermost layer of the atmosphere among all these options. The exosphere marks the transition into space, where Earth's gravity is very weak and particles may escape into space.

23. The _______ layer is the upper limit of our atmosphere. It extends from the top of the thermosphere up to 10,000 km (6,200 miles). [S.S.C. Online CHSL (T-I) 14.10.2020 (Shift-I) S.S.C. JE Civil Exams 23.03.2021 (Shift-I)]

Correct Answer: (a) Exosphere
Solution:Among all layers of the earth's atmosphere Exosphere is the outermost layer.

Exosphere: Key Features

FeatureDetails
Altitude RangeStarts around 600 km and extends up to 10,000 km+
Main CompositionVery thin gases – mostly hydrogen and helium
Air DensityExtremely low – atoms and molecules are far apart
TemperatureCan be very high, but not "felt" due to sparse particles
SatellitesSome satellites orbit within this region
Merges WithOuter space

24. Which is the warmest layer of the atmosphere? [S.S.C. Online CGL(T-I) 11.09.2016 (Shift-I)]

Correct Answer: (a) Thermosphere
Solution:The warmest layer of the atmosphere is the thermosphere.

Thermosphere: Key Features

FeatureDetails
Altitude RangeFrom about 85 km to 600+ km above Earth’s surface
TemperatureCan rise up to 2,000°C (3,600°F) or more
Why It's So HotMolecules absorb high-energy solar radiation (X-rays and UV)
Air DensityVery low — so it feels "cold" despite high temperatures
PhenomenaAuroras occur here; ISS orbits in this layer

Note: Even though temperatures are extremely high, you wouldn't feel hot because the air is so thin there aren’t enough molecules to transfer heat to your skin.

25. What is the mean temperature of earth? [S.S.C. Online CHSL (T-I) 16.01.2017(Shift-III)]

Correct Answer: (b) 16 degree celsius
Solution:

According to NASA, the average temperature of the Earth is 15 °C.

Whereas according to some books, the average temperature of the earth is 16 degree Celsius.

Key Notes:

  • This is the global average temperature, considering both land and ocean surfaces.

  • It balances the extreme temperatures found in different regions:

    Equator: much warmer
    Poles: much colder

  • This average helps maintain conditions suitable for life on Earth.

26. The lowest layer of atmosphere is called [S.S.C. Online CHSL (T-I) 15.01.2017(Shift-I)]

Correct Answer: (b) Troposphere
Solution:The lowest layer of the atmosphere is called the troposphere.

Troposphere: Key Features

FeatureDetails
Altitude RangeSurface to about 8–15 km (varies by latitude)
Main FunctionsContains all weather phenomena (clouds, rain, storms)
Air MassHolds about 75% of the atmosphere’s total mass
Temperature TrendDecreases with increasing altitude
Upper BoundaryCalled the tropopause, separates it from the stratosphere

It’s the layer closest to Earth's surface, where humans live and breathe.

27. Whih of the following is the lowermost layer oWhih of the following is the lowermost layer of the Atmosphere?f the Atmosphere? [S.S.C. Online C.G.L (T-I) 9.02.2020 (Shift-II)]

Correct Answer: (c) Troposphere
Solution:The lowest layer of the atmosphere is called the troposphere.

Troposphere: Key Features

FeatureDetails
Altitude RangeSurface to about 8–15 km (varies by latitude)
Main FunctionsContains all weather phenomena (clouds, rain, storms)
Air MassHolds about 75% of the atmosphere’s total mass
Temperature TrendDecreases with increasing altitude
Upper BoundaryCalled the tropopause, separates it from the stratosphere

It’s the layer closest to Earth's surface, where humans live and breathe.

28. Which instrument is used for measuring humidity of atmosphere? [S.S.C. Online C.G.L.(T-I) 7.09.2016 (Shift-I)]

Correct Answer: (d) Hygrometer
Solution:The Hygrometer is used for measuring the humidity of the air.

29. What is the topmost layer of the Earth's surface called? [S.S.C. Online MTS (T-I) 14.08.2019 (Shift-I)]

Correct Answer: (d) crust
Solution:Earth consists of three parts: core, mantle and crust. The uppermost layer is called the crust.

Explainer: Earth — layer by layer