Winds

Question 1

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

Answer 1

(a) Right
>(b) Left

Question 2

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

Answer 2

(a)Left
> (b) Right

Question 3

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

Answer 3

> (a)False
(B)True

Question 4

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

Answer 4

(a)Left
>(b) Right

Question 5

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

Answer 5

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

Question 6

Coriolis force is strongest at ……

Answer 6

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

Question 7

Geostrophic rule breaks down at…………

Answer 7

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

Question 8

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

Answer 8

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

Question 9

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

Answer 9

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

Question 10

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

Answer 10

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

Question 11

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

Answer 11

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

Question 12

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

Answer 12

> (a) Starboard drift
(b) Port drift

Question 13

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

Answer 13

> (a) Under
(b) Over

Question 14

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

Answer 14

(a) Under
>(b) Over

Question 15

Lines of constant wind speed drawn on weather charts are called

Answer 15

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

Question 16

Squall are distinguished from gusts by:

Answer 16

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

Question 17

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

Answer 17

(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

Question 18

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

Answer 18

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

Question 19

Anabatic wind occurs

Answer 19

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

Question 20

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

Answer 20

(a) True
>(b) False

Question 21

Katabatic wind is down slope cold wind due to nocturnal cooling

Answer 21

> (a) True
(b) False

Question 22

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

Answer 22

> (a) True
(b) False

Question 23

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

Answer 23

(a) True
>(b) False

Question 24

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

Answer 24

> (a) True
(b) False

Question 25

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

Answer 25

(a) True >(b) False

Question 26

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

Answer 26

>(a) True (b) False

Question 27

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

Answer 27

>(a) True (b) False

Question 28

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

Answer 28

(a) True >(b) False

Question 29

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

Answer 29

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

Question 30

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

Answer 30

>(a) True (b) False

Question 31

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

Answer 31

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

Question 32

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

Answer 32

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

Question 33

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

Answer 33

(a) Backing >(b) Veering

Question 34

A change from 270° to 250° is

Answer 34

>(a) Backing (b) Veering

Question 35

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

Answer 35

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

Question 36

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

Answer 36

>(a) Squall (b) Gust

Question 37

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

Answer 37

(a) False >(b) True

Question 38

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

Answer 38

>(a) True (b) False

Question 39

Rotor clouds have extremely turbulent flying conditions

Answer 39

(a) False >(b) True

Question 40

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

Answer 40

(a) 20°/10° >(b) 30°/15° (c) 40°/30°

Question 41

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

Answer 41

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

Question 42

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

Answer 42

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

Question 43

Gale is

Answer 43

(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

Question 44

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

Answer 44

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

Question 45

The inertial flow is

Answer 45

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

Question 46

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

Answer 46

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