Vayudoot Aviation

1. The trigger action may take place due to

Clear night sky, no wind

Orographic lifting

high pressure

2. Andhi (blinding storms) occur generally over

S India

N India

NE India

3. Over plains TS mostly occur during the

night

afternoon

early morning

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

2 hrs

30 to 45 min

3 to 4 hr

5. Over valley and foot hills TS generally occur during

afternoon

night & early morning

6. Duststorm usually occurs over NW India during

Winter

Post-monsoon

Pre-Monsoon

7. A 'mature' thunderstorm has strong

updraft only

downdraft only

updrafts and downdrafts

8. Norwesters are

Sever thunderstorms which occur over Peninsula during hot weather period

The western disturbances which affect NW India

Severe thunderstorms which occur over NE India during hot weather period

9. The diameter of Microburst is

less than 4 km

less than 2 km

less than 6 km

10. A short duration, showery precipitation is associated with

ST

CB

AS

11. Norwesters normally occur during

Afternoons

Mornings

Nights

12. The most hazardous cloud for variation is

NS

CB

CU

13. Hail is most likely to fall from a cloud

Composed of Ice crystals

Having layers

Having strong vertical development

14. Over the sea TS are more frequent

afternoon

early morning

night

15. Norwesters originates over

Khasi hills

Deccan Plato

Chota-Nagpur hills

16. For airborne radars wavelength generally used

40 mm

20 mm

60 mm

17. 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

18. The wavelength of TS detection X band radar is

30 mm

10 mm

20 mm

19. Norwesters occur during

Oct-Dec

Jan-Feb

Mar-May

June-Sep

20. Hail is

Frozen or partly frozen rain falling from sheet type of clouds

Solid precipitation commonly occurring over the mountainous regions in the winters

Solid precipitation falling from a deep convective cloud

21. Hazards of the mature stage of a TS cell include lighting, turbulence and

Microburst, wind-shear and anvil

WS, hail and fog

Icing, drizzle and microburst

Icing, microburst and WS

22. Norwesters occur during

Winter

Post-Monsoon

Hot weather

Monsoon

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

600 - 700 mm

400 - 500 mm

30 to 200 mm

24. The life of a Cb cell is usually

2 -3 hr

3 to 4 hrs

7 to 8 hrs

25. Norwesters affect

Central India

Bengal, Bihar, Orissa and Assam

N India

26. Andhi (blinding storms) occur generally over

N India

NE India

S India

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

Horizontal

Slant

Vertical

28. Severe TS cells are tilted

in vertical

to the south

to the North

29. 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

Severe TS

Light TS

Moderate TS

30. The life of Mesoscale Convective Complex TS is

6 to 24 hr

2-3 hr

3-4 hr

31. The wavelength of storm detection S band radar is

50 mm

100 mm

200 mm

32. The diametre of and Macroburst

4 km or more

› 8 km

‹ 4 km

33. Hail grows by

freezing as it leaves the cloud

up and down forces in CU cloud

collision with supercooled water drops

collision with ice crystals

34. The condition necessary for the formation of a thunderstorm are

Steep lapse rate, adequate supply of moisture and trigger action

Steep lapse rate, strong winds

Shallow lapse rate, adequate supply of moisture

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

0°C and -20°C

-20°C and -40°C

below -40°C

36. Wind speed in Light DS is

25 kt

30 kt

up to 21 kt

Question Bank

Questions for IC THUNDERSTORMS