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CPL Test Series
Question Bank
Questions for ADIABATIC AND STABILITY1
Answer the following questions
Test Mode
Training Mode
1. From which of the following can the stability of the atmosphere be determined?
ELR
surface pressure
surface temperature
DALR
2. Why does air cool as it rises?
It expands
The air is colder at higher altitudes
It contracts
The air is colder at higher latitudes
3. What happens to the temperature of a saturated air mass when descending?
it heats up more than dry because of compression
it heats up less than dry because of evaporation
it heats up less than dry because of latent heat released during condensation
it heats up more than dry because of expansion
4. What is the effect of a strong low level inversion?
Unstable conditions
Calm conditions
Good visibility
Windshear
5. A mass of unsaturated air is forced to rise till just under the condensation level. It then settles back to its original position
Temp. is less than before
Temp. stays the same
It depends on QFE
Temp. is greater than before
6. What happens to the stability of the atmosphere in an inversion? (Temp increasing with height) Absolutely stable
Conditionally unstable
Absolutely stable
Unstable
Conditionally stable
7. The DALR is
Variable with time
Fixed
Variable with latitude
Variable with temperature
8. A parcel of air cooling by more than 1°C/100m is said to be?
Stable
Conditionally unstable
Conditionally stable
Unstable
9. In unstable air, surface visibility is most likely to be restricted by
drizzle
haze
low stratus
showers of rain or snow
10. In an air mass with no clouds the surface temperature is 15°C and 13°C at 1000m. This layer of air is
stable
a layer of heavy turbulence
conditionally unstable
unstable
11. In still air a lapse rate of 1.2°C/100m refers to
ELR
ALR
SALR
DALR
12. When warm air is advected in the lower part of a cold layer of air
stability will remain the same
stability decreases in the layer
stability increases in the layer
stability will be conditional
13. What happens to stability of the atmosphere in an isothermal layer? (Temp constant with height)
Conditionally unstable
Absolutely stable
Conditionally stable
Unstable
14. The temperature at the surface is 15°C, the temperature at 1000m is 13°C.Is the atmosphere
Unstable
Conditionally unstable
Stable
Cannot tell
15. In an unstable layer there are cumuliform clouds. The vertical extent of these clouds depends on the
thickness of the unstable layer
wind direction
pressure at different levels
air pressure at the surface
16. A layer of air can be
Conditional; unstable when saturated and stable when unsaturated
All of the above
Neutrally stable when saturated and unstable when unsaturated
Conditional; unstable when unsaturated and stable when saturated
17. During an adiabatic process heat is
neither added nor lost
added but the result is an overall loss
neither added nor lost
lost
18. ELR is 1°C/100m
Conditional stability
Absolute stability
Absolute instability
Neutral when dry
19. The stability in a layer is increasing if
cold and dry air is advected in the upper part
warm air is advected in the upper part and cold air in the lower part
warm and moist air is advected in the lower part
warm air is advected in the lower part and cold air in the upper part
20. What happens to the temperature of a saturated air mass when forced to descend?
it heats up more than dry because of sublimation
it heats up less than dry because of latent heat released during condensation
it heats up less than dry because of evaporation
it heats up more than dry because of expansion
21. The rate of cooling of ascending saturated air is less than the rate of cooling of ascending unsaturated air because:
water vapour absorbs the incoming heat from the sun
moist air is heavier than dry air
heat is released during the condensation process
water vapour doesn’t cool as rapidly as dry air
22. Which of the following gives conditionally unstable conditions when saturated?
None of the above
0.65°C/100m
1°C/100m
0.49°C/100m
23. If the ELR is 0.65°C/100m
Atmosphere is stable when dry
Atmosphere is absolutely unstable
Atmosphere is absolutely stable
Atmosphere is conditionally stable
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