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CPL Test Series
Question Bank
Questions for INDIGO METEOROLOGY(3272-4089)
Answer the following questions
Test Mode
Training Mode
1. Under which of these conditions is radiation fog most likely to form?
Very dry air
Little or no cloud
Very low temperatures
Strong surface winds
2. Which of the following clouds may extend into more than one layer?
Nimbostratus.
Cirrus.
Altocumulus.
vStratus.
3. The dewpoint temperature
can not be equal to the air temperature
can not be lower than the air temperature
can be reached by lowering the pressure whilst keeping temperature constant
can be reached by cooling the air whilst keeping pressure constant
4. The QFF at an airfield in California located 69 metres below sea level is 1030 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QNH?
More than 1030 hPa
It is not possible to give a definitive answer
Less than 1030 hPa
1030 hPa
5. A layer in which the temperature decreases with 1°C per 100m is
neutral for dry air
absolutely unstable
conditionally unstable
absolutely stable
6. Geostrophic wind is the wind when isobars are
straight lines and no friction is involved.
curved lines and no friction is involved
curved lines and friction is involved.
straight lines and friction is involved.
7. 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 below +3°C.
significantly below 0°C.
significantly above +3°C.
slightly above +3°C.
8. Which of the following conditions gives the highest value of the QNH?
QFE = 1003 hPa, elevation = 1200 FT (366m)
QFE = 995 hPa, elevation = 1600 FT (488m)
QFE = 1000 hPa, elevation = 1200 FT (366m)
QFE = 995 hPa, elevation = 1200 FT (366m)
9. Which of the following is most likely to lead to the formation of radiation fog?
Cold air passing over warm ground
Dry, warm air passing over warm ground
Heat loss from the ground on clear nights
The passage of fronts
10. The troposphere is the
boundary between the stratosphere and the mesosphere
boundary between the mesosphere and thermosphere
part of the atmosphere below the tropopause
part of the atmosphere above the stratosphere
11. What are the characteristics of cumuliform clouds?
Small water droplets, instability, turbulence, extensive areas of rain and rime ice.
Large water droplets, stability, no turbulence, showers and mainly rime ice.
Small water droplets, stability, no turbulence and extensive areas of rain.
Large water droplets, instability, turbulence, showers and mainly clear ice.
12. In a layer of air the decrease in temperature per 100 metres increase in height is more than 1°C. This layer can be described as being
absolutely stable
conditionally unstable
absolutely unstable
conditionally stable
13. Steady precipitation, in contrast to showery precipitation falls from
stratiform clouds with little or no turbulence
stratiform clouds with severe turbulence
convective clouds with little or no turbulence
convective clouds with moderate turbulence
14. Which of the following conditions are most favourable to the formation of mountain waves ?
Either stable or unstable air at mountain top and a wind of at least 30 knots blowing parallel to the mountain ridge.
Unstable air at mountain top altitude and a wind at least 20 knots blowing across the mountain ridge.
Moist unstable air at mountain top and wind of less than 5 knots blowing across the mountain ridge.
Stable air at mountain top altitude and a wind at least 20 knots blowing across the mountain ridge.
15. Relative humidity at a given temperature is the relation between
water vapour weight and dry air weight
water vapour weight and humid air volume
actual water vapour content and saturated water vapour content
dew point and air temperature
16. Which of the following are medium level clouds ?
All convective clouds
Cirrocumulus and cirrostratus
Altostratus and altocumulus
Cumulonimbus
17. If you are flying at FL 120 and the outside temperature is -2°C, at what altitude will the ""freezing level"" be?
FL 130
FL 110
FL 90
FL 150
18. A parcel of moist but not saturated air rises due to adiabatic effects. Which of the following changes ?
Mixing ratio
Specific humidity
Absolute humidity
Relative humidity
19. During a flight at FL 100 from Marseille (QNH 1012 hPa) to Palma de Mallorca (QNH 1015 hPa), an aircraft remains at a constant true altitude. The reason for this is that
one of the two QNH values may be incorrect.
the air at Marseille is warmer than that at Palma de Mallorca.
the air at Marseille is colder than that at Palma de Mallorca.
the altimeters are erroneous, and need to be tested.
20. An aircraft is approaching under visual flight rules an airfield whose runway is parallel to the coast. When downwind over the sea, the airfield is on the right. What wind effect should be anticipated on final approach and landing during a sunny afternoon?
Headwind
Crosswind from the left
Tailwind
Crosswind from the right
21. 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.
In the core of the jet stream.
Looking downstream, the area to the right of the core.
Above the core in the boundary between warm and cold air.
22. The decrease in temperature, per 100 metres, in a saturated rising parcel of air at lower level of the atmosphere is approximately
0.35°C
0.6°C
1.5°C
1°C
23. The geostrophic wind is less than the gradient wind around an anticyclone because the
centrifugal force is added to the pressure gradient
effect of coriolis is added to friction
centrifugal force opposes the pressure gradient
coriolis effect opposes the centrifugal force
24. In the lower layers of the atmosphere due to friction the wind changes direction towards the low pressure area because
the pressure gradient increases
wind speed decreases and therefore coriolis force decreases
turbulence is formed and pressure increases
turbulence is formed and pressure decreases
25. At which pressure and temperature conditions may you safely assume that the minimum usable flight level at least lies at the same height, as the minimum safe altitude?
In a warm high pressure region
At a temperature less than or equal to that of the ISA and where the QNH is less than 1013 hPa
In a cold low pressure region
At a temperature greater than or equal to that of the ISA and where the QNH is greater than or equal to 1013 hPa
26. Which statement is true ?
QNH can be lower as well as higher than 1013.25 hPa
QNH can not be 1013.25 hPa
QNH can be 1013.25 only for a station at MSL
QNH is lower than 1013.25 hPa at any time
27. What degree of turbulence, if any, is likely to be encountered while flying through a cold front in the summer over Central Europe at FL 100?
Light turbulence in CB cloud.
Light turbulence in ST cloud.
Severe turbulence in CB cloud.
Moderate turbulence in NS cloud.
28. The process by which water vapour is transformed directly into ice is known as
radiation cooling
sublimation
supercooling
supersaturation
29. From which of the following pieces of information can the stability of the atmosphere be derived?
Surface temperature
Dry adiabatic lapse rate
Environmental lapse rate
Pressure at the surface
30. At the approach of a warm front (northern hemisphere) the wind direction changes from the surface up to the tropopause. The effect of this change is that the wind
backs in the friction layer and veers above the friction layer
veers in the friction layer and backs above the friction layer
backs in the friction layer and and backs above the friction layer
veers in the friction layer and veers above the friction layer
31. In an area of converging air
stratified clouds can be dissolved
clouds can not be formed
convective clouds can be dissolved
clouds can be formed
32. During a flight over the sea at FL 100 from Marseille (QNH 1012 hPa) to Palma de Mallorca (QNH 1012 hPa), the true altitude is constantly increasing. What action, if any, should be taken ?
Have your altimeter checked, because its readings are obviously wrong
None, the reason for the change is that the air around Palma is warmer than the air around Marseille
Compensate by heading further to the left
Recheck the QNH because one of the QNH values must be wrong
33. At FL 180, the air temperature is -35°C.The air density at this level is
Unable to be determined without knowing the QNH.
Equal to the density of the ISA atmosphere at FL 180
Less than the density of the ISA atmosphere at FL 180
Greater than the density of the ISA atmosphere at FL 180.
34. The QNH of an airport at sea level is 983 hPa and the temperature deviation from ISA is -15°C below FL 100.What is the true altitude of FL 100?
8590 FT.
9790 FT.
10210 FT.
11410 FT.
35. Which layer of the atmosphere contains more than 90 per cent of all water vapour?
Ionosphere
Upper stratosphere
Lower stratosphere
Troposphere
36. Dew point is defined as
the lowest temperature to which air must be cooled in order to reduce the relative humidity
the temperature to which moist air must be cooled to become saturated at a given pressure
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
37. What are the differences between radiation fog and advection fog ?
Radiation fog forms due to surface cooling at night in a light wind. Advection fog forms when warm humid air flows over a cold surface.
Radiation fog is formed by surface cooling in a calm wind. Advection fog is formed by evaporation over the sea.
Radiation fog forms due to night cooling and advection fog due to daytime cooling.
Radiation fog forms only on the ground, advection fog only on the sea.
38. An aircraft is flying over the sea at FL 120, with a true altitude of 12000 feet, local QNH is 1013 hPa. What assumption, if any, can be made about the air mass in which the aircraft is flying ?
It is warmer than ISA
There is insufficient information to come to any conclusion
It is colder than ISA
Its average temperature is the same as ISA
39. Which of the following statements concerning the core of a polar front jet stream is correct ?
It lies in the warm air, its pressure surfaces are horizontal at the height of the core
It and its surface projection lie in the warm air
It lies at a height where there is no horizontal temperature gradient, the slope of the pressure surfaces at the height of the core is at its maximum
It lies in the cold air, the thermal wind reverses direction at the height of the core
40. In which zone of a jet stream is the strongest CAT to be expected ?
About 12000 FT above the core
Exactly in the centre of the core.
The warm air side of the core.
The cold air side of the core.
41. Which form of precipitation from clouds containing only water is most likely to fall in mid-latitudes?
Hail.
Moderate rain with large drops.
Drizzle.
Moderate rain with large drops.
42. The vertical extent of the friction layer depends primarily on
roughness of surface, temperature, local time
wind speed, roughness of surface, temperature
temperature, local time, environmental lapse rate
stability, wind speed, roughness of surface
43. What prevents air from flowing directly from high-pressure areas to low-pressure areas ?
Surface friction
The pressure gradient force
Coriolis force
Katabatic force
44. Relative humidity
increases if the air is cooled whilst maintaining the vapour pressure constant
is higher in warm air than in cool air
decreases if the air is cooled whilst maintaining the vapour pressure constant
is higher in cool air than in warm air
45. Clouds, classified as being low level are considered to have bases from
the surface to 6500 FT
1000 to 2000 FT
100 to 200 FT
500 to 1000 FT
46. What is the main cause for the formation of a polar front jet stream?
The pressure difference, close to the ground, between a high over the Azores and a low over Iceland
The north-south horizontal temperature gradient at the polar front
The varied elevations of the tropopause in the polar front region
Strong winds in the upper atmosphere
47. What is the relationship, if any, between QFE and QNH at an airport situated 50 FT below sea level?
QFE is smaller than QNH.
No clear relationship exists.
QFE equals QNH.
QFE is greater than QNH
48. Which of the following types of clouds are evidence of unstable air conditions?
SC, NS.
ST, CS.
CU, CB.
CI, SC.
49. 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.
50. Which of the following statements is true concerning advection fog?
It forms when unstable air is cooled adiabatically
It forms at night or the early morning
It forms slowly and disappears rapidly
It can be formed suddenly by day or night
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