DGCA Meteorology: Air Temperature Questions
65 exam-style Air Temperature questions for the DGCA Meteorologypaper (CPL & ATPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
- Q1
The total energy radiated by a black body is proportional to its temperature(T)
- AT2
- BT3
- CT4
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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.
- Q2
Hot bodies (like sun) radiate
- AShort Waves
- BLong Waves
- CBoth
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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.
- Q3
Rise in temperature with height is
- AInversion
- BLapse
- CNormal
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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.
- Q4
Convective activity over land in mid-latitudes is greatest in
- Asummer during the night and early morning
- Bwinter in the afternoon.
- Csummer in the afternoon.
- Dwinter 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?
- AAbsorption and vaporization.
- BAbsorption and evaporation.
- CConvection and condensation.
- DSolar 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
- D0°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
- Aa cold front
- Bhaze
- Cgood clear weather
- Dradiation fog
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Correct answer: D. radiation fog
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- Q8
The environmental lapse rate in an actual atmosphere
- Ahas a fixed value of 2°C/1000 FT
- Bvaries with time
- Chas a fixed value of 1°C/100m
- Dhas 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
- Adecreases with height at a constant rate
- Bincreases with height at a constant rate
- Cremains constant with height
- Dincreases 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
- Aslightly below +3°C
- Bsignificantly below 0°C.
- Cslightly above +3°C
- Dsignificantly 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.
- Q11
An inversion is a layer of air in which the temperature
- Aremains constant with height
- Bincreases with height more than 1°C/100m
- Cdecreases with height more than 1°C/100m
- Dincreases with height
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Correct answer: D. increases with height
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- Q12
An inversion is
- Aa decrease of pressure with height
- Ba decrease of temperature with height
- Can increase of temperature with height
- Dan increase of pressure with height
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Correct answer: C. an increase of temperature with height
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