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