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Meteorology > Winds > Flashcards

Winds Flashcards

1
Q

In S hemisphere if an observer faces wind, low will be to his ……

A

(a) Right
>(b) Left

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2
Q

In N hemisphere due to rotation of earth winds are deflected to …………….

A

(a)Left
> (b) Right

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3
Q

Local Winds follow Buys Ballots law………..
(a) True
(b) False

A

> (a)False
(B)True

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4
Q

Coriolis force acts perpendicular to the ……… of wind direction in N hemisphere

A

(a)Left
>(b) Right

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5
Q

Geostrophic wind is due to the balance between the forces ………

A

(a) Coriolis and Frictional
(b) Pressure gradient and Cyclostrophic
>(c) Pressure gradient and Coriolis

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6
Q

Coriolis force is strongest at ……

A

(a) Mid latitudes
>(b) Poles
(c) Equator

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7
Q

Geostrophic rule breaks down at…………

A

(a) Mid latitudes
(b) Poles
>(c) Equator

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8
Q

Fohn winds are ……….. on the Leeward side of a mountain.

A

> (a) Dry &Warm
(b) Cold & Humid

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9
Q

The wind sliding down a hill during night is called ………. wind.

A

(a) Fohen
(b) Anabatic
>(c) Katabatic

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10
Q

With the onset of sea breeze there is a ……… in temperature and ………… in RH.

A

> (a) Fall/Rise
(b) Rise/Fall
(c)Fall/Fall

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11
Q

Sea breeze sets in by ……….. and dies off at ………..

A

(a) Night/Day
>(b) Day/Night
(c) Both Day and Night

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12
Q

If an aircraft in N-hemisphere flies from H to L it will experience ………

A

> (a) Starboard drift
(b) Port drift

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13
Q

In N-Hemisphere if you experience Port drift, altimeter will read

A

> (a) Under
(b) Over

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14
Q

In N-Hemisphere if you experience Starboard drift, altimeter will read

A

(a) Under
>(b) Over

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15
Q

Lines of constant wind speed drawn on weather charts are called

A

(a) Isobars
>(b) Isotachs
(c) Isogons

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16
Q

Squall are distinguished from gusts by:

A

(a) Shorter duration
>(b) Longer duration
(c) Lower wind speed

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17
Q

The thermal wind is:
(a)The wind that blows because of thermals
(b)The warm wind that blows down the hill on the leeward side
(c)The wind which must be added vectorially to the lower level geostrophic wind to obtain the upper level geostrophic wind

A

(a)The wind that blows because of thermals
(b)The warm wind that blows down the hill on the leeward side
>(c)The wind which must be added vectorially to the lower level geostrophic wind to obtain the upper level geostrophic wind

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18
Q

On a weather map if isobars are closely packed, the surface winds are likely to be

A

(A)Light and parallel to isobars
>(B)Strong and parallel to isobars
(C)Strong and blowing across the isobars

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19
Q

Anabatic wind occurs

A

(a) At night
(b) Any time of day and night
>(c) During day

20
Q

Anabatic wind is stronger than katabatic
(a) True
(b) False

A

(a) True
>(b) False

21
Q

Katabatic wind is down slope cold wind due to nocturnal cooling

A

> (a) True
(b) False

22
Q

Katabatic wind occur due to sinking of cold air down the hill slope

A

> (a) True
(b) False

23
Q

Anabatic wind occur due to downward movement of air along valley
(a) True
(b) False

A

(a) True
>(b) False

24
Q

Sea breeze is stronger than land breeze
(a) True
(b) False

A

> (a) True
(b) False

25
Q

The wind blows clockwise around a low in N-hemisphere
(a) True
(b) False

A

(a) True
>(b) False

26
Q

The wind blows clockwise around a low in S-hemisphere
(a) True
(b) False

A

> (a) True
(b) False

27
Q

The wind blows anticlockwise around a low in N-hemisphere
(a) True
(b) False

A

> (a) True
(b) False

28
Q

The wind blows anticlockwise around a low in S- hemisphere
(a) True
(b) False

A

(a) True
>(b) False

29
Q

The resultant Wind that blows under the influence of pressure gradient force, geostrophic force and cyclostrophic force is called

A

> (a) Gradient wind
(b) Geostrophic Wind
(c) Cyclostrophic wind

30
Q

Due to friction, from day to night for an isobaric pattern (in N hemisphere) the surface wind backs and weakens
(a) True
(b) False

A

> (a) True
(b) False

31
Q

The winds which spirals inward counter-clockwise in the N Hemisphere are associated with

A

(a) Turbulence
(b) High pressure area
>(c) Low pressure area

32
Q

Lower level wind 05010 kt, upper level wind 23005 kt, what is the thermal wind

A

(a) 05005 kt
>(b) 23015 kt
(c) 05015 kt

33
Q

A change in wind direction from 310° to 020° is

A

(a) Backing
>(b) Veering

34
Q

A change from 270° to 250° is

A

> (a) Backing
(b) Veering

35
Q

Sudden changes in wind speed from 10 kt to 30 kt and then to 15 kt are

A

> (a) Gust
(b) Squall
(c) gale

36
Q

Sudden change in wind speed from 10 kt to 30 kt for 2 to 3 minutes are

A

> (a) Squall
(b) Gust

37
Q

A significant wind shear is generally associated With TS or line squall
(a) True
(b) False

A

(a) False
>(b) True

38
Q

Cyclostrophic wind gives a good approximation of the 2000’ wind in an intense tropical storm

A

> (a) True
(b) False

39
Q

Rotor clouds have extremely turbulent flying conditions

A

(a) False
>(b) True

40
Q

Friction causes winds to flow cross isobaric by ………. over land and ……… over sea

A

(a) 20°/10°
>(b) 30°/15°
(c) 40°/30°

41
Q

If the S is warmer than the N, level by level, from surface up to higher levels then the…….. wind will strengthen with height with no change in direction in N hemisphere

A

(a) Ely
>(b) Wly
(c) Sly
(d) Nly

42
Q

Gradient wind is a ……. of the geostrophic Wind in an anticyclone

A

(a) Under estimate
(b) Accurate
>(c) Over estimate

43
Q

Gale is

A

(a) Persistent strong winds with mean speed 44 kt, associated with thunderstorm
(b) Marked increase in wind speed lasing few minutes associated With CB or DS
>(c) Persistent strong winds exceeding 33 kt, associated with depression

44
Q

In N hemisphere thermal wind is parallel to ………. with low value to left

A

(a) Isobars
>(b) Isotherms
(c) Isallobars

45
Q

The inertial flow is

A

(a) cyclonic in both the Hemispheres
>(b) anti cyclonic in both the Hemispheres
(c) anti cyclonic around an anticyclone

46
Q

Upper level wind is 24025 kt, lower level wind is 06015 kt, the thermal wind is?

A

(a)16010 kt
>(b) 24040 kt
(c) 24010 kt

Meteorology (23 decks)

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