Vayudoot Aviation

1. What type of cloud is being described ?A generally grey cloud layer with fairly uniform base and uniform appearance, which may give drizzle or snow grains. When the sun is visible through the cloud, the outline is clearly discernible. Sometimes it appears in the form of ragged patches.

Cirrostratus

Stratus

Nimbostratus

Stratus

2. What is the average height of the jet core within a polar front jet stream?

20000 FT.

50000 FT.

30000 FT.

40000 FT.

3. Under which of these conditions is radiation fog most likely to form?

Very dry air

Very low temperatures

Little or no cloud

Strong surface winds

4. What of the following is the most important constituent in the atmosphere from a weather stand-point ?

Water vapour

Nitrogen

Oxygen

Hydrogen

5. During periods of prolonged clear skies associated with anticyclonic conditions, the

angle between isobars and surface wind direction tends to be greatest in the early afternoon

surface wind speed tends to be highest during the early afternoon

wind tends to back from early morning until early afternoon

surface wind speed tends to be highest at night

6. An isohypse (contour)

is the longest slope line of a frontal surface

is the limit between two air masses of different temperature

indicates the altitude of the zero degree isotherm

indicates the true altitude of a pressure level

7. The rate of decrease of temperature with height per 100 m in the International Standard Atmosphere is

0.5°C

variable

0.65°C

1°C

8. In which air mass are extremely low temperatures encountered?

Tropical continental air

Arctic maritime air.

Polar maritime air.

Polar continental air

9. Steaming fog (arctic sea smoke) occurs in air

with cold mass properties

with warm mass properties

that is stable

10. The isobars drawn on a surface weather chart represent lines of equal pressure

at a determined density altitude

at height of observatory

reduced to sea level

at flight level

11. Which of the following is most likely to lead to the dissipation of radiation fog ?

Ground cooling caused by radiation during the night

A build up of a high pressure area resulting in adiabatic warming associated with a sinking air mass

A marked increase in wind velocity near the ground

A marked decrease in wind velocity close to the ground

12. At what time of day, or night, is radiation fog most likely to occur?

Shortly after midnight.

At sunset.

Shortly after sunrise.

Late evening.

13. In an area of converging air

stratified clouds can be dissolved

convective clouds can be dissolved

clouds can be formed

clouds can not be formed

14. At approximately what altitude is the subtropical jet stream found over Europe?

FL 200

FL 500

FL 400

FL 300

15. Steady precipitation, in contrast to showery precipitation falls from

stratiform clouds with little or no turbulence

convective clouds with moderate turbulence

stratiform clouds with severe turbulence

convective clouds with little or no turbulence

16. While crossing a jet stream at right angles in Western Europe (3000 FT below its core) and OAT is decreasing, what would be the prevailing wind?

Crosswind from the left

A tailwind.

Crosswind from the right

A headwind.

17. What does dewpoint mean?

The freezing level (danger of icing).

The temperature to which a mass of air must be cooled in order to reach saturation.

The temperature at which the relative humidity and saturation vapour pressure are the same.

The temperature at which ice melts.

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

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

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

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

Heating of the air by subsidence

19. All pilots encountering Clear Air Turbulence are requested to report it. You experience CAT which causes passengers and crew to feel definite strain against their seat belt or shoulders straps. Unsecured objects are dislodged. Food service and walking are difficult. This intensity of CAT should be reported as

light

moderate

servere

extreme

20. Which area of a polar front jet stream in the northern hemisphere has the highest probability of turbulence?

Looking downstream, the area to the left of the core.

Looking downstream, the area to the right of the core.

Above the core in the boundary between warm and cold air.

In the core of the jet stream.

21. Which of the following weather conditions favour the formation of radiation fog?

Light wind, extensive cloud, dry air.

Strong wind, little or no cloud, moist air.

Light wind, extensive cloud, moist air.

Light wind, little or no cloud, moist air.

22. Before landing, an altimeter set to QFE indicates

the height of the aircraft's wheels above the runway.

the aircraft's altitude above the mean sea level.

the flight level.

in standard atmosphere, the height of the aircraft above the official airport elevation.

23. Supercooled droplets can occur in

clouds but not in fog

precipitation but not in clouds

clouds but not in precipitation

clouds, fog and precipitation

24. In order to calculate QFE from QNH, which of the following must be known ?

Temperature at the airfield

Elevation of the airfield and the temperature at MSL

Elevation of the airfield.

Elevation and the temperature at the airfield

25. The QNH is equal to the QFE if

T actual < T standard

T actual = T standard

the elevation = 0

T actual > T standard

26. You are flying at 2 500 FT/AGL, with a southerly wind, and intend to land at an airport, at sea level directly below. From approximately which direction would you expect the surface wind (mid-latitude, northern hemisphere)?

South-southwest.

South

South-southeast.

Southwest.

27. A temperature of +15°C is recorded at an altitude of 500 metres above sea level. If the vertical temperature gradient is that of a standard atmosphere, what will the temperature be at the summit of a mountain, 2500 metres above sea level?

-2°C

+2°C

+4°C

0°C

28. 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

slightly above +3°C.

slightly below +3°C.

significantly above +3°C.

significantly below 0°C.

29. If you are flying at FL 300 in an air mass that is 15°C warmer than a standard atmosphere, what is the outside temperature likely to be?

-15°C

-45°C

-30°C

-60°C

30. Which of the following are favourable conditions for the formation of freezing rain?

Water droplets falling from cold air aloft with a temperature below 0°C.

Warm air aloft from which rain is falling into air with a temperature below 0°C.

Cold air aloft from which hail is falling into air that is warm.

An isothermal layer aloft with a temperature just above 0°C through which rain is falling.

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

1°C per 100m

0.5°C per 100m

0.6°C per 100m

0.65°C per 100m

32. With what type of cloud is ""GR"" precipitation most commonly associated?

CC

AS

CB

ST

33. If in a 100 m thick layer the temperature at the bottom of the layer is 10°C and at the top of the layer is 8°C then this layer is

neutral

absolutely stable

absolutely unstable

conditionally unstable

34. Freezing rain occurs when

water vapour first turns into water droplets

rain falls into a layer of air with temperatures below 0°C

ice pellets melt

snow falls into an above-freezing layer of air

35. What pressure is defined as QFE?

The pressure reduced to sea level using actual temperatures

The pressure of the altimeter

The pressure at field elevation

The pressure reduced to sea level using ISA temperatures

36. During a cross-country flight at FL 50, you observe the following sequence of clouds:Nimbostratus, Altostratus, Cirrostratus, Cirrus.Which of the following are you most likely to encounter ?

A strong downdraught.

Decreasing temperatures.

Increasing temperatures.

Strong, gusty winds

37. The 0° isotherm is forecast to be at FL 50. At what FL would you expect a temperature of -6° C?

FL 100

FL 20

FL 110

FL 80

38. A moist but unsaturated parcel of air becomes saturated by

lifting the parcel to a higher level

moving the parcel to an area with lower pressure and equal temperature

lowering the parcel to a lower level

moving the parcel to an area with higher pressure and equal temperature

39. The station pressure used in surface weather charts is

QNH

QFF

QNE

QFE

40. Relative humidity at a given temperature is the relation between

actual water vapour content and saturated water vapour content

dew point and air temperature

water vapour weight and dry air weight

water vapour weight and humid air volume

41. What is the average vertical extent of radiation fog?

5 000 FT.

2 000 FT.

500 FT.

10 000 FT.

42. In the northern hemisphere the gradient wind of a cyclonic pressure distribution is 350/24, over the sea the surface wind would approximate

030/28

340/20

030/20

340/28

43. In an air mass with no clouds the surface temperature is 15°C and 13°C at 1000m. This layer of air is

conditionally unstable

unstable

stable

a layer of heavy turbulence

44. Which of the following is true concerning an aircraft that is flying at FL180 in the northern hemisphere, where wind is geostrophic and the true altitude remains constant ?

There is no cross wind

There is a cross wind from the left

There is a cross wind from the right

Without knowing temperature at FL 180 this question can not be answered

45. A 700 hPa pressure level can vary in height. In temperate regions which of the following average heights is applicable ?

FL 300

FL 180

FL 390

FL 100

46. The following statements deal with precipitation, turbulence and icing. Select the list containing the most likely alternatives for NS cloud

Precipitation may be snow, sleet or rain. Icing is probable and may range between light and severe. Turbulence is rarely more than moderate.

Precipitation and icing are usually nil. Turbulence is rarely more than moderate.

Precipitation may be snow, sleet or rain. Icing and turbulence are frequently severe.

Precipitation is frequently in the form of hail. Icing and turbulence are frequently severe.

47. The morning following a clear, calm night when the temperature has dropped to the dewpoint, is likely to produce

advection fog

a cold front

radiation fog

good clear weather

48. The dry adiabatic lapse rate has a value of

1°C/100m

2°C/1000FT

0.65°C/100m

0.5°C/100m

49. The difference between temperature and dewpoint is greater in

dry air

air with high temperature

air with low temperature

moist air

50. Which of the following is a cause of stratus forming over flat land?

The release of latent heat.

Unstable air.

Convection during the day.

Radiation during the night from the earth surface in moderate wind.

Question Bank

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