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

Precipitation

1.       When super cooled water drops and ice particles co-exist, the ice crystals grow at the expense of the water drops because

a.      Saturation vapour pressure over water drops is less than over the ice crystals

b.    Saturation vapour pressure over the ice crystals is less than over water drops

c.      The ice crystals convert into water drops

2.       The clouds whose tops extend well above the freezing level are called

a.      Warm Clouds

b.    Cold Clouds

c.      Moderate Clouds

3.       The clouds whose tops do not extend to the freezing level are called

a.    Warm Clouds

b.      Cold Clouds

c.      Moderate Clouds

4.       Coalescence Theory explains occurrence of rainfall from the

OPTICAL PHENOMENA IN THE ATMOSPHERE

1.       Aurora Australis occur in the

a.    S hemisphere

b.      N hemisphere

c.      Equator

2.       Aurora Australis called .... Lights

a.      Northern

b.    Southern

c.      Temperate

3.       Aurora BoreaKs occur in the

a.      S hemisphere

b.    N hemisphere

c.      Equator

4.       Aurora Borealis are called              Lights

a.    Northern

b.      Southern

c.      Temperate

5.       Corona occur in  clouds

a.    AS

b.      NS

c.      CS

6.       Bishop's ring is due to the diffraction of light by fine particles of

Vertical Motion And Clouds

1.       Drizzle occurs from

a.      CS

b.    ST

c.      NS

d.      CU

2.       Altostratus (AS) is

a.      Low cloud of sheet type

b.    A medium cloud of sheet type

c.      A cloud of large vertical growth

d.      A high cloud of sheet type

3.       Showers occurs from

a.      CU

b.    CB

c.      AS

d.      AC

4.       Heavy icing is possible in

a.      CI

b.      CS

c.      ST

d.    CB

5.       To avoid icing in cloudy conditions, a pilot is advised to fly through a cloud which shows an optical phenomena

ATMOSPHERIC VISIBILITY

44.   Fog is reported when visibility is reduced to

a.    Less than 1000 m

b.      1000m

c.      1000 to 2000

45.   RVR is reported when visibility falls below

a.      500 m

b.      1000 m

c.    1500 m

d.      2000 m

46.   Radiation fog occurs

a.    Over land

b.      Over sea

c.      During day

47.   When visibility reduces between 5000 m and 1000 m and RH is almost 100%, it is

Wind

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

a.      Right

b.    Left

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

a.      Left

b.    Right

3.       Local Winds follow Buys Ballots law

a.    False

b.      True

4.       Coriolis force acts perpendicular towards             of wind direction

HUMIDITY

1.       The ratio in % between the amount of water vapour present in the air to the amount of water vapour that it can hold at the same temperature is

a.      Humidity

b.    Relative humidity

c.      Dew point

2.       The temperature to which air be cooled at constant pressure to become saturated, is called

a.      Wet bulb temperature

b.      Dry bulb temperature

c.    Dew point

d.      Humidity

3.       Free air temperature, Wet bulb temperature and Dew point temperature are equal when

a.      Air temperature is 0°C

b.    Relative humidity is 100%

c.      Air temperature is not below 0°C

4.       On a rainy day compared to sunny day the length of runway required is

a.    More

b.      Less

c.      Same

5.       The spread between Free air temperature and Dew point temperature is .... when air is saturated

a.      Large

b.    Least

c.      Same

6.       The saturation vapour pressure over water is         than the ice

a.    More

b.      Less

c.      Same

7.       As the temperature of the air increases, the amount of water vapour required to saturate it

a.      decreases

b.    increases

c.      remains same

8.       The actual amount of water vapour contained in a given volume of air at a given temperature is termed as ...

ATMOSPHERIC DENSTY / Air Density

1.       Density is     at poles than equator

a.    Higher

b.      Lower

c.      Same

2.       Above 8 km density is         at poles than at equator

a.      Higher

b.    Lower

c.      Same

3.       The altitude in ISA at which air density is the same as the observed density is called

a.    Density Altitude

b.      ISA Density

c.      Real Density

4.       Density is usually expressed as

a.      Kg/sq m

b.    g/cu m

c.      N/sq m

5.       Higher density altitude means        density

TEMPERATURE

1.       Diurnal variation of temperature is greatest when wind is

a.    calm

b.      light

c.      strong

2.       Diurnal variation of temperature is maximum over

a.      forest

b.      ocean

c.    land

3.       On a clear day the amount of radiation received by earth surface is

a.      3/4 th

b.      30%

c.    5/6 th

4.       ALBEDO is

a.      Radiation received by earth

b.      Amount of heat

c.    Reflecting power of earth

5.       During Day the ambient temperature is ... than ground

Atmospheric Pressure

1.       Winds in a low pressure

a.    Converge

b.      Diverge

c.      Go straight

2.       Low pressure is associated with

a.      Good Weather

b.    Bad Weather

c.      None

3.       In a high pressure area winds are

a.      Normal

b.      Strong

c.    Weak

4.       Flying from Low to High an altimeter would read

Atmosphere

Atmosphere

1.       Lowest layer of atmosphere is

a.    Troposphere   

b.      Tropopause  

c.      Stratosphere

2.       Height of Tropopause at equator is

a.      10-12 km

b.    16-18 km

c.      12-14 km

3.       Height of Tropopause at Poles is

a.      12-14 km

b.      12-13 km

c.    08-10 km

4.       Higher the surface temperature would be the tropopause