THUNDERSTORMS – Air – DGCA Question Bank For Politics

#1. The condition necessary for the formation of a thunderstorm are:

Steep lapse rate, strong winds

Shallow lapse rate, adequate supply of moisture

Steep lapse rate, adequate supply of moisture and trigger action

#2. Hail is most likely to fall from a cloud

Having layers

Composed of Ice crystals

Having strong vertical development

#3. Norwesters are

The western disturbances which affect NW India

Severe thunderstorms which occur over NE India during hot weather period

Sever thunderstorms which occur over Peninsula during hot weather period

#4. Duststorm usually occurs over NW India during

Post-monsoon

Winter

Pre-Monsoon

#5. A 'mature' thunderstorm has strong

updraft only

downdraft only

updrafts and downdrafts

#6. Aircraft icing is most favoured in the cloud which have temperatures ranging between

-20°C and -40°C

0°C and -20°C

below -40°C

#7. A short duration, showery precipitation is associated with

ST

AS

CB

#8. Hail is

Solid precipitation commonly occurring over the mountainous regions in the winters

Frozen or partly frozen rain falling from sheet type of clouds

Solid precipitation falling from a deep convective cloud

#9. The most hazardous cloud for variation is

CB

CU

NS

#10. The life of a Cb cell is usually

7 to 8 hrs

3 to 4 hrs

2 -3 hr

#11. Generally the severest activity of a, heat type, TS is for

2 hrs

30 to 45 min

3 to 4 hr

#12. Norwesters occur during

Winter

Hot weather

Monsoon

Post-Monsoon

#13. Norwesters affect

N India

Bengal, Bihar, Orissa and Assam

Central India

#14. The trigger action may take place due to

Clear night sky, no wind

Orographic lifting

high pressure

#15. Norwesters normally occur during

Mornings

Afternoons

Nights

#16. Norwesters originates over

Chota-Nagpur hills

Deccan Plato

Khasi hills

#17. Andhi (blinding storms) occur generally over

S India

N India

NE India

#18. Wind speed in Light DS is

25 kt

30 kt

up to 21 kt

#19. The diametre of and Macroburst

‹ 4 km

4 km or more

› 8 km

#20. For detecting precipitation a Radar wavelength in the range _____ is suitable

30 to 200 mm

400 - 500 mm

600 - 700 mm

#21. For airborne radars wavelength generally used

20 mm

40 mm

60 mm

#22. Norwesters occur during

Jan-Feb

Mar-May

June-Sep

Oct-Dec

#23. The diameter of Microburst is

less than 4 km

less than 2 km

less than 6 km

#24. The wavelength of TS detection X band radar is

10 mm

20 mm

30 mm

#25. The wavelength of storm detection S band radar is

50 mm

100 mm

200 mm

#26. Over plains TS mostly occur during the

afternoon

night

early morning

#27. Over valley and foot hills TS generally occur during

afternoon

night & early morning

Over plains TS mostly occur during the

#28. Over the sea TS are more frequent

afternoon

night

early morning

#29. The life of Mesoscale Convective Complex TS is

2-3 hr

3-4 hr

6 to 24 hr

#30. Loud peals of thunder, frequent flashes of lightning, moderate or heavy showers accompanies by the light hail with maximum wind speed 15-40 kt is classified as

Light TS

Moderate TS

Severe TS

#31. For a severe TS one of the requirements is strong Wind Shear

Horizontal

Vertical

Slant

#32. Severe TS cells are tilted

in vertical

to the south

to the North

#33. When flying through on active TS, lighting strikes are most likely

Above 5000 ft and under the anvil

In the clear air below the cloud in rain

In the temperature band between +10° and -10°C

At or about 10000 ft

#34. Hazards of the mature stage of a TS cell include lighting, turbulence and;

Microburst, wind-shear and anvil

Icing, microburst and WS

Icing, drizzle and microburst

WS, hail and fog

#35. Hail grows by

freezing as it leaves the cloud

up and down forces in CU cloud

collision with ice crystals

collision with supercooled water drops

Dgca Question Bank For Pilots

Results

#1. The condition necessary for the formation of a thunderstorm are:

#2. Hail is most likely to fall from a cloud

#3. Norwesters are

#4. Duststorm usually occurs over NW India during

#5. A 'mature' thunderstorm has strong

#6. Aircraft icing is most favoured in the cloud which have temperatures ranging between

#7. A short duration, showery precipitation is associated with

#8. Hail is

#9. The most hazardous cloud for variation is

#10. The life of a Cb cell is usually

#11. Generally the severest activity of a, heat type, TS is for

#12. Norwesters occur during

#13. Norwesters affect

#14. The trigger action may take place due to

#15. Norwesters normally occur during

#16. Norwesters originates over

#17. Andhi (blinding storms) occur generally over

#18. Wind speed in Light DS is

#19. The diametre of and Macroburst

#20. For detecting precipitation a Radar wavelength in the range _____ is suitable

#21. For airborne radars wavelength generally used

#22. Norwesters occur during

#23. The diameter of Microburst is

#24. The wavelength of TS detection X band radar is

#25. The wavelength of storm detection S band radar is

#26. Over plains TS mostly occur during the

#27. Over valley and foot hills TS generally occur during

#28. Over the sea TS are more frequent

#29. The life of Mesoscale Convective Complex TS is

#30. Loud peals of thunder, frequent flashes of lightning, moderate or heavy showers accompanies by the light hail with maximum wind speed 15-40 kt is classified as

#31. For a severe TS one of the requirements is strong Wind Shear

#32. Severe TS cells are tilted

#33. When flying through on active TS, lighting strikes are most likely

#34. Hazards of the mature stage of a TS cell include lighting, turbulence and;

#35. Hail grows by