DGCA Meteorology: Air Temperature Questions
65 exam-style Air Temperature questions for the DGCA Meteorology paper (CPL · ATPL · PPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
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Q1
The total energy radiated by a black body is proportional to its temperature(T)
- A T2
- B T3
- C T4
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Correct answer: C. T4
By the Stefan-Boltzmann law, the total energy radiated by a black body is proportional to the fourth power of its absolute temperature, T to the power 4.
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Q2
Hot bodies (like sun) radiate
- A Short Waves
- B Long Waves
- C Both
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Correct answer: A. Short Waves
By Wien's law, the hotter the body the shorter the wavelength of its peak emission, so very hot bodies like the sun radiate predominantly short-wave radiation, while the cool earth re-radiates long waves.
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Q3
Rise in temperature with height is
- A Inversion
- B Lapse
- C Normal
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Correct answer: A. Inversion
A rise of temperature with height is an inversion, the reverse of the normal tropospheric lapse of temperature with altitude.
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Q4
Convective activity over land in mid-latitudes is greatest in
- A summer during the night and early morning
- B winter in the afternoon.
- C summer in the afternoon.
- D winter during the night and early morning.
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Correct answer: C. summer in the afternoon.
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Q5
Several physical processes contribute to atmospheric warming. Which of the following contribute the most?
- A Absorption and vaporization.
- B Absorption and evaporation.
- C Convection and condensation.
- D Solar radiation and conduction.
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Correct answer: C. Convection and condensation.
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Q6
The temperature at FL 160 is -22°C. What will the temperature be at FL 90 if the ICAO standard lapse rate is applied?
- A +4°C
- B -8°C
- C -4°C
- D 0°C
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Correct answer: B. -8°C
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Q7
The morning following a clear, calm night when the temperature has dropped to the dew point, is likely to produce
- A a cold front
- B haze
- C good clear weather
- D radiation fog
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Correct answer: D. radiation fog
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Q8
The environmental lapse rate in an actual atmosphere
- A has a fixed value of 2°C/1000 FT
- B varies with time
- C has a fixed value of 1°C/100m
- D has a fixed value of 0.65°C/100m
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Correct answer: B. varies with time
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Q9
An isothermal layer is a layer of air in which the temperature
- A decreases with height at a constant rate
- B increases with height at a constant rate
- C remains constant with height
- D increases with height
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Correct answer: C. remains constant with height
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Q10
Around Paris on January 3rd at 1800 UTC, the surface temperature, under shelter, is 3°C. The sky is covered by 8 oktas of stratus. QNH is 1033 hPa. If the sky is covered all night, the minimum temperature of the night of January 3rd to January 4th should be
- A slightly below +3°C
- B significantly below 0°C.
- C slightly above +3°C
- D significantly above +3°C.
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Correct answer: A. slightly below +3°C
A complete stratus overcast acts as a blanket, absorbing terrestrial radiation and re-radiating it back to the surface, so nocturnal cooling is strongly limited. The temperature therefore falls only a little overnight, ending slightly below the evening value of +3°C rather than well below freezing.
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Q11
An inversion is a layer of air in which the temperature
- A remains constant with height
- B increases with height more than 1°C/100m
- C decreases with height more than 1°C/100m
- D increases with height
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Correct answer: D. increases with height
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Q12
An inversion is
- A a decrease of pressure with height
- B a decrease of temperature with height
- C an increase of temperature with height
- D an increase of pressure with height
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Correct answer: C. an increase of temperature with height
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