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CPL Test Series
Question Bank
Questions for HUMIDITY 1
Answer the following questions
Test Mode
Training Mode
1. When a given mass of air descends, what effect will it have on relative humidity?
It remains constant.
It increases up to 100%, and then remains stable
It decreases.
It increases.
2. The process by which water vapour is transformed directly into ice is known as
radiation cooling
sublimation
supercooling
supersaturation
3. The dewpoint temperature
is always higher than the air temperature
can not be equal to the air temperature
is always lower than the air temperature
can be equal to the air temperature
4. The difference between temperature and dewpoint is greater in
moist air
dry air
air with low temperature
air with high temperature
5. In which layer is most of the atmospheric humidity concentrated?
Stratopause
Troposphere
Stratosphere
Tropopause
6. A parcel of moist but not saturated air rises due to adiabatic effects. Which of the following changes?
Absolute humidity
Specific humidity
Relative humidity
Mixing ratio
7. The maximum amount of water vapour that the air can contain depends on the
stability of the air
relative humidity
dewpoint
air temperature
8. Which of the following is the definition of relative humidity?
Ratio between water vapour (g) and air (kg) X 100
Ratio between the actual mixing ratio and the saturation mixing ratio X 100
Ratio between water vapour pressure and atmospheric pressure X 100
Ratio between air temperature and dewpoint temperature X100
9. Which of the following statements is true of the dew point of an air mass?
It can be used together with the air pressure to estimate the air mass’s relative humidity
It can be used to estimate the air mass’s relative humidity even if the air temperature is unknown
It can only be equal to, or lower, than the temperature of the air mass
It can be higher than the temperature of the air mass
10. The dewpoint temperature
can be reached by cooling the air whilst keeping pressure constant
can not be equal to the air temperature
can be reached by lowering the pressure whilst keeping temperature constant
can not be lower than the air temperature
11. Relative humidity
is higher in cool air than in warm air
increases if the air is cooled whilst maintaining the vapour pressure constant
decreases if the air is cooled whilst maintaining the vapour pressure constant
is higher in warm air than in cool air
12. Which of the following changes of state is known as sublimation?
Liquid direct to vapour
Solid direct to liquid
Liquid direct to solid
Solid direct to vapour
13. Dew point is defined as
the temperature to which moist air must be cooled to become saturated at a given pressure
the lowest temperature to which air must be cooled in order to reduce the relative humidity
the temperature below which the change of state in a given volume of air will result in the absorption of latent heat
the lowest temperature at which evaporation will occur for a given pressure
14. What does dewpoint mean?
The temperature at which the relative humidity and saturation vapour pressure are the same.
The temperature at which ice melts.
The freezing level (danger of icing).
The temperature to which a mass of air must be cooled in order to reach saturation.
15. Relative humidity
changes when water vapour is added, even though the temperature remains constant.
does not change when water vapour is added provided the temperature of the air remains constant
is not affected when air is ascending or descending.
is not affected by temperature changes of the air
16. When water evaporates into unsaturated air
heat is released
heat is absorbed
relative humidity is not changed
relative humidity is decreased
17. Relative humidity depends on
moisture content of the air only
moisture content and temperature of the air
moisture content and pressure of the air
temperature of the air only
18. Relative humidity at a given temperature is the relation between
water vapour weight and humid air volume
water vapour weight and dry air weight
dew point and air temperature
actual water vapour content and saturated water vapour content
19. How does relative humidity and the dewpoint in an unsaturated air mass change with varying temperature?
When temperature decreases, the relative humidity and the dewpoint remain constant.
When temperature decreases, the relative humidity decreases, and the dewpoint increases
When temperature increases, the relative humidity increases, and the dewpoint decreases.
When temperature increases, the relative humidity decreases, and the dewpoint remains constant.
20. In which of the following changes of state is latent heat released?
Solid to liquid
Gas to liquid
Solid to gas
Liquid to gas
21. The relative humidity of a sample air mass is 50%. How is the relative humidity of this air mass influenced by changes of the amount of water vapour in it?
It increases with increasing water vapour
It is not influenced by changing water vapour
It decreases with increasing water vapour
It is only influenced by temperature.
22. During the late afternoon an air temperature of +12°C and a dew point of +5°C were measured. What temperature change must occur during the night in order to induce saturation?
It must decrease by 5°C.
It must decrease to +5°C.
It must decrease to +7°C.
It must decrease to +6°C.
23. How, if at all, is the relative humidity of an unsaturated air mass influenced by temperature changes?
It is not influenced by temperature changes
It increases with increasing temperature.
It decreases with increasing temperature.
It is only influenced by the amount of water vapour.
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