METEOROLOGICAL SERVICES FOR AVIATION

1.       For non-scheduled National Flights an advance notice (before ETD) is required to be given to Class I Met Offices

a.    3 hr

b.      18-24 hr

c.      6 hr

2.       For non-scheduled National Flights advance notice an advance notice (before ETD) is required to be given to Class III Met Offices

a.       3 hr

b.     18-24 hr

c.       6 hr

3.       World Area Forecast System provides high quality en-route forecasts of  to Met Offices

a.    Met Offices

b.      en-route forests of winds and temperature

c.      SIGMET

d.      TREND

4.       IMD has      Regional Met offices

a.       4    

b.       5  

c.    6

5.       There arc     Class I Met Offices

Tropical Systems And CLIMATOLOGY OF INDIA

1.       Wind speed in a tropicaJ severe cyclone is:

a.       27 -33 kt 

b.     48 - 63 kt  

c.       17-27 kt

2.       Fronts are characteristic of:

a.      Tropical cyclone

b.    Extra-tropical depressions

c.      Monsoon depressions

3.       During re-curvature maximum weather in a monsoon depression occurs in

a.         SE sector

b.       NW sector 

c.      SW sector

d.       NE sector

4.       On whatever compass course the cyclone is approached, strong winds from the port indicate that the centre lies somewhere

CLEAR AIR TURBULENCE AND MOUNTAIN WAVES

1.       For mountain waves to form there should be flow of air across the ridge, generally within ……………of the perpendicular to the ridge.

a.     30° 

b.       45°     

c.       60°

2.       For mountain waves to form the wind speed for small mountains should be atleast

a.      15 m/s

b.      10 m/s

c.    7m/s

3.       For mountain waves to form the wind speed for large mountains should be atleast

a.    15 m/s      

b.      10 m/s 

c.       7m/s

4.       For mountain waves to form the atmosphere should be   up to the ridge, where air stream strikes the ridge.

a.       Unstable    

b.     Stable 

c.      Indifferent

5.       For mountain waves to form the atmosphere should be   at higher levels above the ridge

Jet Streams

1.       The arbitrary lower limit of jet core velocity has been assigned by WMO as

a.    60 kt

b.      60 m/s

c.      70 m/s

2.       Jet stream has

a.      one maxima

b.    one or more maxima

c.      only two maxima

3.       The vertical wind shear in a Jet stream is about

a.    5m/s/ km

b.      6m/s/km

c.      8m/s/km

4.       Compared to horizontal wind shear the vertical wind shear in a Jet stream is

a.      weaker

b.    stronger

c.      same

5.       In a jet stream, the path of the maximum speed is known as

GENERAL CIRCULATION

1.       The pole wards moving air piles up in the subtropical regions and forms high pressure belt at the surface, called

a.     Subtropical high  

b.       Polar High   

c.       Equatorial high

2.       occurs over subtropical high

a.       advection

b.       convection

c.     subsidence

3.       The occurrence of large deserts near 30N and 305 are due to large scale

a.     subsidence 

b.       convection

c.      advection

4.       A part of the sinking air over the subtropical highs flows towards the equator, turning west (in the northern hemisphere) due to the Coriolis force. This surface air is called

a.       Trade winds

b.       Roaring forties     

c.     Doldrums

5.       The huge vertical circulations, one between the equator and 3 ON and another between equator and 30S, are called

AIR MASSES, FRONTS AND WESTERN DISTURBANCES

1.       The air mass which originates at sea in low Latitudes is called

a.    Polar maritime

b.      Tropical continental

c.      Tropical maritime

2.       The air mass which originates over equatorial region is

a.      Warm & dry

b.    Warm & Moist

c.      Cold & dry

3.       If the advancing cold front is colder than the cool air mass of the warm front, the advancing cold front undercuts and lifts both the warm and cool air masses  of the warm front. This is

a.    Warm Occlusion

b.      Cold Occlusion

4.       The airmass which originated over land area located in polar region:

a.      Warm & dry

b.      Warm & Moist

c.    Cold & dry

5.       If a warm airmass overtakes a cold air mass, it is called

a.      Cold Front

b.    Warm Front

c.      Occluded Front

6.       At warm front

Thunderstorm

1.       The condition necessary for the formation of a thunderstorm are:

a.      Steep lapse rate, strong winds

b.      shallow lapse rate, adequate supply of moisture

c.    Steps lapse rate ,adequate supply of moisture and trigger action.

2.       Hail is most likely to fall from a cloud

a.      Having layers

b.      Composed of Ice crystals

c.    Having strong vertical development

3.       Nor westers are

a.      The western disturbances which affect NW India

b.    Severe thunderstorms which occur over NE India during hot weather periot

c.      Severe thunderstorms which occur over Peninsula during hot weather perioc

4.       Duststorm usually occurs over NW India during

a.      Post-monsoon

b.      Winter

c.    Pre-Monsoon

5.       A 'mature' thunderstorm has

a.      A strong updraft only

b.      Strong downdraft only

c.    Strong updrafts and downdrafts

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

a.      - 20° C and - 40° C

b.    0° C and - 20° C

c.         below -40 ° C

7.       A short duration, showery precipitation is associated with