Winds

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Question 1: In S hemisphere if an observer faces wind, low will be to his

A) Right

B) Left

Explanation: In the Southern Hemisphere, according to Buys Ballot's law, low pressure is to the left when facing the wind.

Question 2: In N hemisphere due to rotation of earth winds are deflected to

A) Left

B) Right

Explanation: Due to the Coriolis effect, winds in the Northern Hemisphere are deflected to the right.

Question 3: Local Winds follow Buys Ballot's law

A) False

B) True

Explanation: Buys Ballot's law applies to large-scale pressure systems, not local winds.

Question 4: Coriolis force acts perpendicular to the ………… of wind direction in N hemisphere

A) Left

B) Right

Explanation: The Coriolis force deflects moving objects to the right in the Northern Hemisphere.

Question 5: Geostrophic wind is due to the balance between the forces ……….

A) Coriolis and Friction

B) Pressure gradient and Cyclostrophic

C) Pressure gradient and Coriolis

Explanation: Geostrophic wind is the result of the balance between the pressure gradient force and the Coriolis force.

Question 6: Coriolis force is strongest at ……..

A) Mid latitudes

B) Poles

C) Equator

Explanation: The Coriolis force is strongest at the poles and weakest at the equator.

Question 7: Geostrophic rule breaks down at …….

A) Mid latitudes

B) Poles

C) Equator

Explanation: The geostrophic rule breaks down near the equator because the Coriolis effect is too weak.

Question 8: Fohn winds are …….. on the Leeward side of a mountain,

A) Dry and Warm

B) Cold and Humid

Explanation: Fohn winds are dry and warm winds that descend on the leeward side of mountains.

Question 9: The wind sliding down a hill during night is called ……….. wind.

A) Fohn

B) Anabatic

C) Katabatic

Explanation: Katabatic winds are cold winds that flow downhill, typically at night.

Question 10: With the onset of sea breeze there is a ……………. in temperature and …………. in RH.

A) Fall/Rise

B) Rise/Fall

C) Fall/Fall

Explanation: A sea breeze brings cooler air, leading to a fall in temperature and a rise in relative humidity.

Question 11: Sea breeze sets in by ……. and dies off at …...

A) Night/Day

B) Day/Night

C) Both Day and Night

Explanation: Sea breezes typically develop during the day and die off at night.

Question 12: If an aircraft in N-hemisphere flies from H to L it will experience

A) Starboard drift

B) Port drift

Explanation: In the Northern Hemisphere, flying from high to low pressure results in a starboard drift due to the Coriolis effect.

Question 13: In N-Hemisphere if you experience Port drift, altimeter will read

A) Under

B) Over

Explanation: Port drift in the Northern Hemisphere will cause the altimeter to read lower than the actual altitude.

Question 14: Lines of constant wind speed drawn on weather charts are called

A) Isobars

B) Isotachs

C) Isogons

Explanation: Isotachs are lines of constant wind speed on weather charts.

Question 15: Squalls are distinguished from gusts by:

A) Shorter duration

B) Longer duration

C) Lower wind speed

Explanation: Squalls are characterized by their longer duration compared to gusts.

Question 16: 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

Explanation: The thermal wind is the difference between upper and lower level geostrophic winds caused by temperature gradients.

Question 17: On a weather map where isobars are closely packed, the surface winds are likely to be

A) Light and parallel to isobars

B) Strong and parallel to isobars

C) Strong and blowing across the isobars

Explanation: Closely packed isobars indicate strong winds that are generally parallel to the isobars.

Question 18: Anabatic wind occurs

A) At night

B) Any time of day and night

C) During day

Explanation: Anabatic winds occur during the day as warm air rises up slopes.

Question 19: Anabatic wind is stronger than katabatic

A) True

B) False

Explanation: katabatic winds are generally stronger compared to anabatic winds.

Question 20: Katabatic wind is down slope cold wind due to nocturnal cooling

A) True

B) False

Explanation: Katabatic winds are cold winds that flow down slopes due to nighttime cooling.

Question 21: Katabatic wind occur due to sinking of air down the hill slope

A) True

B) False

Explanation: Katabatic winds occur due to the cooling and sinking of air down a hill slope.

Question 22: Anabatic wind occur due to downward movement of air along valley

A) True

B) False

Explanation: Anabatic winds occur due to the upward movement of warm air along slopes, not down valleys.

Question 23: Sea breeze is stronger than land breeze

A) True

B) False

Explanation: Sea breezes are generally stronger than land breezes due to the greater temperature contrast between land and sea during the day.

Question 24: The wind blows clockwise around low in a N­hemisphere

A) True

B) False

Explanation: In the Northern Hemisphere, the wind blows counterclockwise around a low-pressure area.

Question 25: The wind blows clockwise around low in S­hemisphere

A) True

B) False

Explanation: In the Southern Hemisphere, the wind blows clockwise around a low-pressure area.

Question 26: The wind blows anticlockwise around low in N­hemisphere

A) True

B) False

Explanation: In the Northern Hemisphere, winds blow anticlockwise around low-pressure systems.

Question 27: The wind blows anticlockwise around low in S­hemisphere

A) True

B) False

Explanation: In the Southern Hemisphere, winds blow clockwise around low-pressure systems, not anticlockwise.

Question 28: The resultant wind that blows under the influence of pressure gradient force, geostrophic force and cyclostrophic force is called

A) Gradient wind

B) Geostrophic wind

C) Cyclostrophic wind

Explanation: The gradient wind is the resultant wind that balances the pressure gradient force, geostrophic force, and centripetal force in curved flow.

Question 29: Due to friction, from day to night for an isobaric pattern (in N hemisphere) the Surface wind backs and weakens

A) True

B) False

Explanation: Friction causes surface winds to back and weaken from day to night in the Northern Hemisphere.

Question 30: The winds which spiral inward in a counter­clockwise direction in the N Hemisphere are associated with

A) Turbulence

B) High pressure area

C) Low pressure area

Explanation: In the Northern Hemisphere, winds spiral inward in a counterclockwise direction around low-pressure areas.

Question 31: Lower level wind 05010 kt, upper level wind 23005 kt, what is the thermal wind

A) 05005 kt

B) 23015 kt

C) 05015 kt

Explanation: The thermal wind is the difference between the upper level and lower level winds, which in this case is 23015 kt.

Question 32: A change in wind direction from 310° to 020° is

A) Backing

B) Veering

Explanation: A change in wind direction from 310° to 020° is a veering, as the wind direction is shifting clockwise.

Question 33: A change from 270° to 250° is

A) Backing

B) Veering

Explanation: A change from 270° to 250° is a backing, as the wind direction is shifting counterclockwise.

Question 34: Sudden change in wind speed from 10 kt to 30 kt and then to 15 kt is

A) Gust

B) Squall

C) Gale

Explanation: A sudden change in wind speed as described is known as a squall.

Question 35: Sudden change in wind speed from 10 kt to 30 kt for 2 ­ 3 minutes

A) Squall

B) Gust

Explanation: A sudden change in wind speed over a short duration is called a gust.

Question 36: A significant wind shear can be associated with TS or line squall

A) False

B) True

Explanation: Significant wind shear is commonly associated with thunderstorms (TS) or line squalls.

Question 37: Cyclostrophic wind gives a good approximation of the 2000' wind in an intense tropical storm

A) True

B) False

Explanation: In intense tropical storms, cyclostrophic wind can approximate the wind at 2000 feet.

Question 38: Rotor clouds have extremely turbulent flying conditions

A) False

B) True

Explanation: Rotor clouds are associated with extremely turbulent conditions due to their association with strong wind shear and turbulence.

Question 39: Friction causes winds to flow cross isobaric by …... over land and ...... over sea

A) 20°/10°

B) 30°/15°

C) 40°/30°

Explanation: Friction causes winds to flow cross isobaric by approximately 30° over land and 15° over the sea.

Question 40: If the S is warmer than 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) Ely

B) Wly

C) Sly

D) Nly

Explanation: In the Northern Hemisphere, if the southern region is warmer than the northern, the southerwesterly (Swly) wind will strengthen with height.

Question 41: Gradient wind is …………… of geostrophic wind in an anticyclone

A) Under estimate

B) Accurate

C) Over estimate

Explanation: The gradient wind typically overestimates the geostrophic wind in an anticyclone due to the effects of centripetal force.

Question 42: Gale is

A) Persistent strong winds with mean speed 44 kt, associated with thunderstorm

B) Marked increase in wind speed lasting few minutes associated with CB or DS (dust storm)

C) Persistent strong winds exceeding 33 kt, associated with depression

Explanation: A gale is characterized by persistent strong winds exceeding 33 knots, commonly associated with depressions.

Question 43: In N hemisphere thermal wind is parallel to ……. with low value to left

A) Isobars

B) Isotherms

C) Isallobars

Explanation: In the Northern Hemisphere, the thermal wind is parallel to isotherms, with a low value to the left.

Question 44: The inertial flow is

A) Cyclonic in both the Hemispheres

B) Anticyclonic in both the Hemispheres

C) Anticyclonic around an anticyclone

D) Cyclonic around a cyclone

Explanation: Inertial flow is anticyclonic around both N-S hemisphere.

Question 45: Upper level wind is 24025 kt, lower level wind is 16015 kt, the thermal wind is?

A) 16010 kt

B) 24040 kt

C) 05015 kt

Explanation: The thermal wind is the difference between upper level and lower level winds, which in this case is 24040 kt.

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