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Meteorology > Thunderstorms > Flashcards

Thunderstorms Flashcards

1
Q

The condition necessary for the formation of a thunderstorm are:

A

(a)Steep lapse rate, strong winds
(b)Shallow lapse rate, adequate supply of moisture
>(c) Steep lapse rate, adequate supply of moisture and trigger action

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2
Q

Hail is most likely to fall from a cloud

A

(a)Having layers
(b)Composed of Ice crystals
>(c)Having strong vertical development

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3
Q

Norwesters are

A

(a)The western disturbances which affect NW India
>(b)Severe thunderstorms which occur over NE India during hot weather period
(c)Severe thunderstorms which occur over Peninsula during hot weather period

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4
Q

Duststorm usually occurs over NW India during

A

(a) Post-monsoon
(b) Winter
>(c) Pre-Monsoon

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5
Q

A ‘mature’ thunderstorm has strong

A

(a) updraft only
(b) downdraft only
>(c) updrafts and downdrafts

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6
Q

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

A

(a) -20°C and -40°C
>(b) 0°C and -20°C
(c) below -40°C

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7
Q

A short duration, showery precipitation is associated with

A

(a) ST
(b) AS
>(c) CB

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8
Q

Hail is

A

(a) Solid precipitation commonly occurring over the mountainous regions in winters.
(b) Frozen or partly frozen rain falling from sheet type of clouds
>(c) Solid precipitation falling from a deep convective cloud

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9
Q

The most hazardous cloud for aviation is

A

> (a) CB
(b) CU
(c) NS

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10
Q

The life of a Cb cell is usually

A

(a) 7 to 8 hrs
(b) 3 to 4 hrs
>(c) 2-3 hr

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11
Q

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

A

(a) 2 hrs
>(b) 30 to 45 min
(c) 3 to 4 hr

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12
Q

Norwesters occur during

A

(a) Jan-Feb
>(b) Mar-May
(c) June-Sep
(d) Oct – Dec

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13
Q

Norwesters occur during

A

(a) Winter
>(b) Hot weather
(c) Monsoon
(d) Post Monsoon

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14
Q

Norwesters affect

A

(a) N India
>(b) Bengal, Bihar, Orissa and Assam
(c) Central India

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15
Q

The trigger action may take place due to

A

(a) Clear night sky, no wind
>(b) Orographic lifting
(c) high pressure

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16
Q

Norwesters normally occur during

A

(a) Mornings
>(b) Afternoons
(c) Nights

17
Q

Norwesters originates over
(a) Chota-Nagpur hills
(b) Deccan Plato
(c) Khasi hills

A

> (a) Chota-Nagpur hills
(b) Deccan Plato
(c) Khasi hills

18
Q

Andhi (blinding storms) occur generally over

A

(a) S India
>(b) N India
(c) NE India

19
Q

Wind speed in Light DS is

A

(a) 25 kt
(b) 30 kt
>(c) up to 21 kt

20
Q

The diameter of Microburst is

A

> (a) less than 4 km
(b) less than 2 km
(c) less than 6 km

21
Q

The diameter of and Macroburst

A

(a) > 4 km
>(b) 4 km or more
(c) > 8 km

22
Q

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

A

> (a) 30 to 200 mm
(b) 400-500 mm
(c) 600-700 mm

23
Q

For airborne radars wavelength generally used

A

(a) 20 mm
(b) 40 mm
>(c) 60 mm

24
Q

The wavelength of TS detection X band radar is

A

(a) 10 mm
(b) 20 mm
>(c) 30 mm

25
Q

The wavelength of storm detection S band radar is

A

(a) 50 mm
>(b) 100 mm
(c) 200 mm

26
Q

Over plains TS mostly occur during the

A

> (a) afternoon
(b) night
(c) early morning

27
Q

Over valley and foot hills TS generally occur during

A

(a) afternoon
>(b) night & early morning

28
Q

Over the sea TS are more frequent

A

a) afternoon
>(b) night
(c) early morning

29
Q

The life of Mesoscale Convective Complex TS is

A

(a) 2-3 hr
(b) 3-4 hr
>(c) 6 to 24 hr

30
Q

Loud peals of thunder, frequent flashes of lightning, moderate or heavy showers accompanied y light hail with maximum wind speed 15-40 kt is classified as

A

(a) Light TS
>(b) Moderate TS
(c) Severe

31
Q

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

A

(a) Horizontal
>(b) Vertical
(c) Slant

32
Q

Severe TS cells arc tilted

A

> (a) in vertical
(b) to the South
(c) to the North

33
Q

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

A

(a) Above 5000 ft and under the anvil.
(b) In the clear air below the cloud in rain
>(c) In the temperature band between +10° and -1O°C
(d) At or about 10000 ft

34
Q

Hazards of the mature stage of a TS Cell include lighting, turbulence and:

A

(a) Microburst, wind-shear and anvil
>(b) Icing, microburst and WS
(c) Icing, drizzle and microburst
(d) WS, hail and fog

35
Q

Hail grows by

A

(a) freezing as it leaves the cloud
(b) up and down forces in CU cloud
(c)Collision with Ice crystals
>(d) collision with supercooled water drops

Meteorology (23 decks)

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