Atmosphere

*Recommend to use Light mode
if you found any mistake in question or answer, Please let us know in comments we will update it.

Question 1: Lowest layer of atmosphere is ?

A) Troposphere

B) Tropopause

C) Stratosphere

Explanation: The Troposphere is the lowest portion of the atmosphere.

Question 2: Height of Tropopause at equator is?

A) 10-12km

B) 16-18km

C) 12-14km

Explanation: It extends to 16-18km over the equator and 8-10km over the poles.

Question 3: Height of Tropopause at Poles is?

A) 12-14km

B) 12-13km

C) 08-10km

Explanation: 8-10km over the poles.

Question 4: Higher the surface temperature ………… would be the tropopause

A) higher

B) lower

C) same

Explanation: Warmer the surface higher is the height of the tropopause.

Question 5: Height of tropopause?

A) Is constant

B) Varies with altitude

C) Varies with Latitude

Explanation: It varies with latitude.

Question 6: Above 8 km the lower temperatures are over

A) Equator

B) Mid Latitudes

C) Poles

Explanation: Lower temperatures are found over the equator above 8 km.

Question 7: Atmosphere is heated by

A) Solar Radiation

B) Heat from earth surface

C) From above

Explanation: The atmosphere is primarily heated by heat radiating from the Earth's surface.

Question 8: Tropos means

A) Turning

B) Under current

C) Convection

Explanation: Tropos is derived from the Greek word meaning 'turning'.

Question 9: CO2 and H2O are also called

A) Green House Gases

B) Rare Earth Gases

Explanation: CO2 and H2O are known as Green House Gases due to their heat-trapping capabilities.

Question 10: Troposphere is generally

A) Stable

B) Unstable

C) Neutral

Explanation: The Troposphere is generally unstable due to continuous convection currents.

Question 11: Stratosphere is

A) Unstable

B) Neutral

C) Stable

Explanation: The Stratosphere is stable due to the temperature inversion with height.

Question 12: Tropopause is discontinuous at about

A) 30° lat

B) 40° lat

C) 60° lat

Explanation: The tropopause is discontinuous at about 40° latitude.

Question 13: Most of atmospheric mass is contained in

A) Troposphere

B) Stratosphere

C) Heterosphere

Explanation: The Troposphere contains most of the atmospheric mass.

Question 14: Stratosphere extends from Tropopause to

A) 50 km

B) 60 km

C) 40 km

Explanation: The Stratosphere extends from the tropopause to about 50 km.

Question 15: The middle atmosphere layer characterised by temperature inversion and stability is

A) Troposphere

B) Tropopause

C) Stratosphere

Explanation: The Stratosphere is characterised by temperature inversion and stability.

Question 16: Mother of pearl clouds occur in

A) Mesosphere

B) Thermosphere

C) Stratosphere

Explanation: Mother of pearl clouds, or nacreous clouds, occur in the Stratosphere.

Question 17: The temperature in ISA at 17 km is

A) -56.5°C

B) 65.5°C

C) 35.5°C

Explanation: In the International Standard Atmosphere (ISA), the temperature at 17 km is -56.5°C.

Question 18: By weight, approximate ratio of O2 to N2 in the atmosphere is

A) 1:3

B) 1:4

C) 1:5

Explanation: By weight, the approximate ratio of oxygen to nitrogen in the atmosphere is 1:3.

Question 19: By volume, the approximate ratio of O2 to N2 in the atmosphere is

A) 1:3

B) 1:4

C) 1:5

Explanation: By volume, the approximate ratio of oxygen to nitrogen in the atmosphere is 1:4.

Question 20: By volume, the proportion of CO2 in the atmosphere is

A) 3%

B) 0.3%

C) 0.03%

Explanation: By volume, the proportion of CO2 in the atmosphere is 0.03%.

Question 21: In ISA, the mean sea level temperature is

A) 15°C

B) 10°C

C) 25°C

Explanation: In the International Standard Atmosphere (ISA), the mean sea level temperature is 15°C.

Question 22: Maximum concentration of ozone is at a height of

A) 10-15 km

B) 20-25 km

C) 30-35 km

Explanation: The maximum concentration of ozone is at a height of 20-25 km.

Question 23: Additional oxygen is needed while flying above

A) 5000 ft

B) 7000 ft

C) 10000 ft

Explanation: Additional oxygen is needed while flying above 10,000 ft.

Question 24: CO2 and H2O keep the atmosphere

A) Warm

B) Cold

C) Have no effect

Explanation: CO2 and H2O keep the atmosphere warm by trapping heat.

Question 25: Noctilucent clouds occur in

A) Thermosphere

B) Mesosphere

C) Stratosphere

Explanation: Noctilucent clouds occur in the Mesosphere.

Question 26: Temperature at 2 km is 5°C, what is the ISA deviation? (Hint: Actual - ISA)

A) -5°C

B) 2°C

C) -3°C

Explanation: The lapse rate:6.5°C/km, Temp ISA 5°C
Since it is 2 km we have to mulitply 2 from lapse rate = 2 x 6.5°C we get = 13°C this is a actual
Now to find ISA Deviation = Actual-ISA, so 13°C-15°C, we get = -3°C.

Question 27: Pressure at MSL is 1002.25 hPa. Find the ISA deviation. (Hint: Actual - ISA)

A) -11 hPa

B) 10 hPa

C) 12 hPa

Explanation: The ISA standard sea level pressure is 1013.25 hPa. Therefore, 1002.25 hPa - 1013.25 hPa = -11 hPa.

Question 28: In actual atmosphere, the temperature at 19 km is 60°C. How much does it differ from ISA deviation?

A) -4.5°C

B) 5.5°C

C) -3.5°C

Explanation: The ISA temperature at 19 km is -56.5°C. The difference from 60°C is -3.5°C.

Question 29: Nacreous clouds occur in

A) Thermosphere

B) Mesosphere

C) Upper Stratosphere

Explanation: Nacreous clouds occur in the upper stratosphere.

Question 30: The atmosphere up to 80 km has a nearly similar composition and is called the Homosphere. Its uniform composition is due to

A) Pressure

B) Gravitation of earth

C) Mixing due to Turbulence

Explanation: The atmosphere has a uniform composition due to gravitation of earth.

Question 31: Half of the atmosphere's air mass is contained below

A) 20,000 ft

B) 15,000 ft

C) 10,000 ft

Explanation: Half of the atmosphere's air mass is contained below 20,000 ft.

Question 32: In jet standard atmosphere, the lapse rate is

A) 2°C/1000 ft

B) 2°C/km

C) 5°C/km

Explanation: In the jet standard atmosphere, the lapse rate is 2°C/1000ft.

Question 33: The rate of fall of temperatures with height is called

A) Isothermal rate

B) Inversion rate

C) Lapse rate

Explanation: The rate of fall of temperatures with height is called the lapse rate.

Question 34: In the actual atmosphere, the lapse rate could

A) assume any value

B) fall up to 8 km

C) rise up to 50 km

Explanation: In the actual atmosphere, the lapse rate could assume any value depending on atmospheric conditions.

Question 35: Tropical tropopause extends from the equator to lat 35°-45°. Over India, it is at

A) 20-21 km

B) 14-15 km

C) 16-16.5 km

Explanation: Over India, the tropical tropopause is at a height of 16-16.5 km.

Question 36: Lapse rate in the troposphere is produced by evaporation, condensation and in the stratosphere by

A) evaporation; condensation

B) rising air; solar radiation

C) terrestrial radiation; solar radiation

D) solar radiation; convection

Explanation: The lapse rate in the troposphere is produced by rising air.

Question 37: Most of the water vapour in the atmosphere is confined to

A) Stratosphere

B) 30,000 ft

C) mid troposphere

D) lower troposphere

Explanation: Most of the water vapour in the atmosphere is confined 30,000 ft.

Question 38: Negative lapse rate of temperature is

A) Isothermal rate

B) temperature rise with lowering height

C) temperature rise with increase in height (INVERSION)

D) temperature fall with height

Explanation: A negative lapse rate of temperature, also known as inversion, is when the temperature rises with an increase in height.

Question 39: In ICAO ISA, the atmosphere is assumed to be isothermal

A) In stratosphere

B) 11 to 16 km

C) 11 to 20 km

D) 11 to 32 km

Explanation: In the ICAO ISA, the atmosphere is assumed to be isothermal between 11 to 20 km.

Question 40: One of the characteristics of our atmosphere is

A) poor conductor of heat and electricity

B) equator is warmer than poles above 10 km

C) lapse rate in the stratosphere is positive

D) density is constant above 8 km

Explanation: The atmosphere is a poor conductor of heat and electricity.

Question 41: Heat transfer in the atmosphere is maximum due to

A) convection

B) radiation

C) sensible heat

D) latent heat

Explanation: Heat transfer in the atmosphere is maximum latent heat.

Question 42: The knowledge of the height of the tropopause is important for a pilot because

A) weather is mainly confined up to this level.

B) clouds rarely reach up to this height due to jetstreams.

C) stratosphere starts at this height where all solar radiation is absorbed.

Explanation: The knowledge of the height of the tropopause is important for pilots because weather is mainly confined up to this level.

Question 43: In ISA atmosphere, the tropopause occurs at a height of

A) 8-10 km

B) 11 km

C) 16-18 km

Explanation: In ISA atmosphere, the tropopause occurs at a height of 11 km.

Question 44: Lapse rate in the troposphere is due to terrestrial radiation and in the stratosphere is due to

A) Conduction, convection

B) terrestrial radiation, solar radiation

C) Rising air, solar radiation

D) Water vapour, Ozone

Explanation: The lapse rate in the troposphere is due to rising air and in the stratosphere is due to solar radiation.

Question 45: There is a reversal of temperature in the atmosphere at 8 km because

A) Lapse rate at poles is always higher than at the equator

B) Lapse rate at equator is always higher than at poles

C) Lapse rate at equator is always higher than at poles

D) Lapse rate reverses at poles and becomes negative

Explanation: There is a reversal of temperature in the atmosphere at 8 km because the lapse rate reverses at the poles and becomes negative.

Final Result

Total Questions Attempted: 0

Correct Answers: 0

Wrong Answers: 0

Percentage: 0%