Vayudoot Aviation

1. Several physical processes contribute to atmospheric warming. Which of the following contribute the most?

Solar radiation and conduction.

Convection and condensation.

Absorption and evaporation.

Absorption and vaporization.

2. An isothermal layer is a layer of air in which the temperature

decreases with height at a constant rate

remains constant with height

increases with height

increases with height at a constant rate

3. In the International Standard Atmosphere the decrease in temperature with height below 11 km is

0.65°C per 100m

0.6°C per 100m

0.5°C per 100m

1°C per 100m

4. If you are flying at FL 100 in an air mass that is 10°C warmer than a standard atmosphere, what is the outside temperature likely to be?

+15°C

-15°C

-10°C

+5°C

5. 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

significantly below 0°C.

slightly below +3°C

significantly above +3°C.

slightly above +3°C

6. The diurnal variation in temperature is largest when the sky is

clear and winds are weak

overcast and winds are strong

overcast and winds are weak

clear and winds are strong

7. Convective activity over land in mid-latitudes is greatest in

winter during the night and early morning.

summer in the afternoon.

summer during the night and early morning

winter in the afternoon.

8. The temperature at FL 160 is -22°C. What will the temperature be at FL 90 if the ICAO standard lapse rate is applied?

-8°C

-4°C

+4°C

0°C

9. On a clear sky, continental ground surface, wind calm, the minimum temperature is reached approximately

at the moment the sun rises

one hour before sunrise

half an hour after sunrise

half an hour before sunrise

10. The environmental lapse rate in an actual atmosphere

varies with time

has a fixed value of 2°C/1000 FT

has a fixed value of 0.65°C/100m

has a fixed value of 1°C/100m

11. An inversion is

a decrease of pressure with height

a decrease of temperature with height

an increase of pressure with height

an increase of temperature with height

12. The radiation of the sun heats

the air in the troposphere only directly if no clouds are present

the air in the troposphere directly

the water vapour in the air of the troposphere

the surface of the earth, which heats the air in the troposphere

13. An inversion is a layer of air in which the temperature

remains constant with height

increases with height more than 1°C/100m

decreases with height more than 1°C/100m

increases with height

14. The morning following a clear, calm night when the temperature has dropped to the dew point, is likely to produce

good clear weather

a cold front

haze

radiation fog

15. Which of the following is a common cause of ground or surface temperature inversion?

Heating of the air by subsidence

Warm air being lifted rapidly aloft, in the vicinity of mountainous terrain.

The movement of colder air under warm air, or the movement of warm air over cold air.

Terrestrial radiation on a clear night with no or very light winds

16. The diurnal variation in temperature is least when the sky is

clear and winds are weak

overcast and winds are strong

overcast and winds are weak

clear and winds are strong

17. What is the technical term for an increase in temperature with altitude?

Advection

Adiabatic

Subsidence

Inversion

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