DGCA Meteorology: Humidity Questions
44 exam-style Humidity 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 difference between air temperature and dew point temperature is greater in:
- A Moist air
- B Dry air
- C Saturated air
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Correct answer: B. Dry air
Dry air has a bigger gap between temp and dew point since it’s far from saturation.
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Q2
Relative humidity depends on
- A moisture content and pressure of the air
- B temperature of the air only
- C moisture content and temperature of the air
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Correct answer: C. moisture content and temperature of the air
Relative humidity is the ratio of the actual water-vapour content to the maximum the air can hold, and that capacity is set by temperature, so RH depends on both the moisture content and the temperature of the air.
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Q3
Humidity mixing ratio during adiabatic ascent:
- A Increases
- B Remains constant
- C Decreases
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Correct answer: B. Remains constant
No moisture is added or lost in adiabatic ascent, so the mixing ratio stays put.
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Q4
If the spread between temperature and dew point is least, the air is:
- A Dry
- B Saturated or near saturation
- C Unstable
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Correct answer: B. Saturated or near saturation
A small temp-dew point gap means the air is almost fully humid.
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Q5
Humidity mixing Ratio _____ when air is lifted adiabatically
- A decreases
- B increases
- C remains constant
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Correct answer: C. remains constant
The humidity mixing ratio stays constant during adiabatic lifting of unsaturated air, since no water vapour is added or removed; it only begins to fall once the air saturates and condensation removes vapour.
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Q6
Humidity mixing Ratio _____ when air is lifted adiabatically
- A remains constant
- B decreases
- C increases
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Correct answer: A. remains constant
During adiabatic ascent of unsaturated air the humidity mixing ratio remains constant, because the mass of water vapour per kilogram of dry air is unchanged until condensation begins.
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Q7
Dependence of water vapor content on air temperature.
- A Decreases as temperature increases
- B Increases as temperature increases
- C Remains constant regardless of temperature
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Correct answer: B. Increases as temperature increases
The water-vapour capacity of air increases as temperature increases, roughly doubling for every 10 degree C rise, which is why warm tropical air can hold far more moisture than cold polar air.
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Q8
Relative humidity depends on
- A moisture content of the air only
- B temperature of the air only
- C moisture content and temperature of the air
- D moisture content and pressure of the air
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Correct answer: C. moisture content and temperature of the air
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Q9
When a given mass of air descends, what effect will it have on relative humidity?
- A It increases.
- B It remains constant.
- C It increases up to 100%, and then remains stable
- D It decreases.
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Correct answer: D. It decreases.
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Q10
What does dewpoint mean?
- A The freezing level (danger of icing).
- B The temperature at which the relative humidity and saturation vapour pressure are the same.
- C The temperature to which a mass of air must be cooled in order to reach saturation.
- D The temperature at which ice melts.
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Correct answer: C. The temperature to which a mass of air must be cooled in order to reach saturation.
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Q11
Relative humidity at a given temperature is the relation between:
- A water vapour weight and humid air volume
- B dew point and air temperature
- C actual water vapour content and saturated water vapour content
- D water vapour weight and dry air weight
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Correct answer: C. actual water vapour content and saturated water vapour content
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Q12
The maximum amount of water vapour that the air can contain depends on the:
- A air temperature
- B relative humidity
- C stability of the air
- D dewpoint
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Correct answer: A. air temperature
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