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~ CPL/ Meteorology > cpl/icjoshi > Flashcards

cpl/icjoshi Flashcards

1
Q

Lowest layer of atmosphere is

A

a. Troposphere

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2
Q

Height of Tropopause at equator is

A

b. 16-18 km

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3
Q

Height of Tropopause at Poles is

A

c. 08-10 km

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4
Q

Higher the surface temperature would be the tropopause

A

a. Higher

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5
Q

Height of tropopause (not in number)

A

c. Varies with Latitude

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6
Q

Above 8 km the lower temperatures are over

A

a. Equator

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7
Q

Atmosphere is heated by

A

b. Heat from earth surface

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8
Q

Tropos means

A

a. Turning

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9
Q

CO2 and H2O are also called ___

A

a. Green House Gases

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10
Q

Troposphere is generally

A

b. Unstable

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11
Q

Stratosphere is

A

c. Stable

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12
Q

Tropopause is discontinuous at about

A

b. 40°Iat

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13
Q

Most of atmospheric mass is contained in ___

A

a. Troposphere

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14
Q

Stratosphere extends from Tropopause to

A

a. 50 km

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15
Q

The middle atmosphere layer characterised by temperature inversion and stability…

A

c. Stratosphere

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16
Q

Mother of pearl clouds occur in ___

A

c. Stratosphere

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17
Q

The temperature in ISA at 17 km is ___

A

a. -56.5°C

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18
Q

By weight, approximate ratio of O2 to N2 in the atmosphere is

A

a. 1:3

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19
Q

By volume, the approximate ratio of O2 to N2 in the atmosphere is

A

b. 1:4

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20
Q

By volume, the proportion CO2 in the atmosphere is

A

c. 0.03%

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21
Q

In ISA, the mean sea level temperature is

A

a. 15° C

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22
Q

Maximum concentration of ozone is at 3 height of

A

b. 20-25 km

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23
Q

Additional oxygen is needed while flying above

A

c. 10000 ft

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24
Q

CO2 and H2O keep the atmosphere

A

a. Warm

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25
Q

Noctilucent clouds occur in

A

b. Mesosphere

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26
Q

Temperature at 2 km is 05 °C what is ISA deviation

A

03* c

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27
Q

Pressure at MSL is 1002.25 hPa. Find the ISA deviation

A

a. -11 hPa

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28
Q

In actual atmosphere temp, at 19 km is -60°C. How much it differs from ISA

A

c. -03.5°C

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29
Q

Winds in a low pressure

A

a. Converge

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30
Q

Low pressure is associated with

A

b. Bad Weather

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31
Q

In a high pressure area winds are

A

c. Weak

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32
Q

Flying from Low to High an altimeter would read

A

b. Under

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33
Q

Isallobars are lines of equal

A

c. Pressure Tendency

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34
Q

What kind of a barometer is an altimeter?

A

a. Aneroid

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35
Q

A region between two Lows and Two Highs is

A

c. Col

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36
Q

Bad weather and better visibility is associate with

A

b. Low

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37
Q

The relationship between height and pressure is made use in construction of

A

a. Altimeter

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38
Q

Altimeter always measure the ht of aircraft

A

c. Above datum level at which its sub-scale is set

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39
Q

Two aircraft flying at the same indicated altitude with their altimeter set to 1013.2 hPa. One is flying over cold air mass and other over warm air mass. Which of the two has greater altitude?

A

a. Ac flying over warm air mass

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40
Q

The rate of fall of pressure with height in a warm air mass compared to cold air mass will be

A

c. Less

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41
Q

An increase of 1000 feet in elevation near the earth is associated with decrease of pressure of

A

d. 33 hPa

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42
Q

Lines drawn through places of equal pressure are known as

A

a. Isobars

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43
Q

Isoclinal

A

b. After crossing the axis of trough winds back

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44
Q

Diurnal pressure changes are most pronounced in

A

c. Tropics

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45
Q

Flying from Delhi to Calcutta at constant indicated altitude but, experiencing a drift to Starboard. The actual altitude will be ___ (Vis-a-vis) indicated altitude

A

a. Lower

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46
Q

In the Southern Hemisphere, around a Low Pressure Area wind blows

A

a. In clockwise direction

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47
Q

If altimeter reads aerodrome elevation when a/c is on ground, its sub-scale must have been set

A

a. QNH

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48
Q

Instrument for recording pressure is called

A

b. Barometer

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49
Q

Poor visibility is associated with

A

a. High

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50
Q

On either side of ___ pressures rise

A

a. Trough

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51
Q

Fall of pressure with height is more rapid in

A

a. Cold areas

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52
Q

300 hPa in ISA corresponds to the level

A

b. 30,000 ft

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53
Q

18,000 ft height in ISA corresponds to level

A

c. 500 hPa

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54
Q

200 hPa in ISA corresponds to the level

A

c. 40,000 ft

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55
Q

24,000 ft height in ISA corresponds to level

A

a. 400 hPa

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56
Q

700 hPa in ISA corresponds to the level

A

b. 10,000 ft

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57
Q

40,000 ft height in ISA corresponds to level

A

c. 200 hPa

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58
Q

850 hPa in ISA corresponds to the level

A

b. 5,000 ft

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59
Q

Diurnal variation of temperature is greatest when wind is

A

a. calm

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60
Q

Diurnal variation of temperature is maximum over

A

c. land

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61
Q

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

A

c. 5/6 th

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62
Q

ALBEDO is

A

c. Reflecting power of earth

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63
Q

During Day the ambient temperature is … than ground

A

a. Lower

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64
Q

Diurnal variation of temperature over ocean is …

A

c. Less than 1°C

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65
Q

At a coast diurnal variation of temp, depends on ..

A

a. Wind direction

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66
Q

Snow surface reflects about % of solar radiation.

A

b. 80%

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67
Q

Amount of Solar radiation received per unit area is … ( not in number)

A

a. Insolation

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68
Q

Solar radiation received by the earth is called ___

A

c. Shortwave

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69
Q

Rise in temperature of a surface is ___ proportional to its specific heat

A

b. Inversely

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70
Q

Specific heat of land is ___ than that of water

A

a. Lower

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71
Q

Minimum temperature is reached at …( not in degree)

A

c. 1/2 - 1 hour after dawn

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72
Q

An air parcel is lifted till it gets saturated. The temperature attained at this stage is called

A

b. Dew Point

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73
Q

Cloudy nights are

A

c. warm

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74
Q

Water vapour is transparent to terrestrial radiation

A

b. partially

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75
Q

Higher the temperature … would be the wavelength of emitted radiation

A

b. shorter

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76
Q

Air is a bad conductor of heat. A parcel of air can therefore be regarded as insulated from the environment

A

b. True

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77
Q

Warmer the earth ___ will be the Nocturnal radiation

A

a. lntense

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78
Q

Heat is the of the KE of all molecules and atoms of a substance

A

a. sum total

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79
Q

The solar radiation consists of about 46 %

A

b. IR

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80
Q

The total amount of energy radiated by a black body is proportional to

A

c. T4

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81
Q

Intense radiation are emitted by

A

a. Hot bodies

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82
Q

The wavelength of most intense radiation is inversely proportional to the….

A

a. Absolute temperature

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83
Q

Hot bodies (like sun) radiate

A

a. Short Waves

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84
Q

The flow of heat from earth surface is 77% by

A

b. Latent Heat

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85
Q

-40° C = -40° F

A

a. True

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86
Q

Surface Temp, is recorded at a height of above ground

A

b. 1.25m

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87
Q

The door of Stevenson’s screen should open

A

a. opposite to sun

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88
Q

The liquid used in Minimum Thermometer is

A

b. alcohol

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89
Q

Density is ___ at poles than equator

A

a. Higher

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90
Q

Above 8 km density is ___ at poles than at equator

A

b. Lower

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91
Q

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

A

a. Density Altitude

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92
Q

Density is usually expressed as

A

b. g/cu m

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93
Q

Higher density altitude means ___ density

A

b. Lower

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94
Q

For given pressure and temperature moist air has density

A

b. Lower

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95
Q

Air is less denser in

A

d. All these

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96
Q

Density altitude may be defined as:

A

b. The altitude in a standard atmosphere at which the prevailing density occurs.

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97
Q

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

b. Relative humidity

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98
Q

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

A

c. Dew point

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99
Q

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

A

b. Relative humidity is 100%

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100
Q

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

A

a. More

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101
Q

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

A

b. Least

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102
Q

The saturation vapour pressure over water is ___ than the ice

A

a. More

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103
Q

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

A

b. increases

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104
Q

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

A

c. Absolute Humidity

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105
Q

Humidity Mixing Ratio ___ when air is lifted adiabatically

A

b. remains constant

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106
Q

It is the lowest temperature which air would attain by evaporating water into it to saturate it.

A

a. Wet bulb temp

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107
Q

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

A

b. Left

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108
Q

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

A

b. Right

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109
Q

Local Winds follow Buys Ballots law

A

a. False

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110
Q

Coriolis force acts perpendicular towards ___ of wind direction

A

b. Right

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111
Q

Geostrophic wind is due to the balance between the forces

A

c. Pressure gradient and Coriolis

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112
Q

Coriolis force is strongest at

A

b. Poles

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113
Q

Geostrophic rule breaks down at

A

c. Equator

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114
Q

Fohn winds are ___ on the Leeward side of a mountain,

A

a. Dry & Warm

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115
Q

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

A

c. Katabatic

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116
Q

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

A

a. Fall/Rise

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117
Q

Sea breeze sets in by ___ and dies off at ___

A

b. Day/Night

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118
Q
  1. If an aircraft in N-hemisphere flies from H to it will experience
A

a. Starboard drift

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119
Q

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

A

a. Under

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120
Q

Lines of constant wind speed drawn on weather charts are called

A

b. Isotachs

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121
Q

Squall are distinguished from gusts by:

A

b. Longer duration

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122
Q

The thermal wind is:

A

c. The wind which must be added vectorilly to the lower level geostrophic wind to obtain the upper level geostrophic wind

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123
Q

On a weather map where isobars are closely packed, the surface winds are likelyto be

A

b. Strong and parallel to isobars

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124
Q

Anabatic wind occurs ( time)

A

c. During day

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125
Q

Anabatic wind is stronger than katabatic

A

b. False

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126
Q

Katabatic wind is down slope cold wind due to nocturnal cooling

A

a. True

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127
Q

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

A

a. True

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128
Q

Anabatic wind occur due to downward movement of air along valley

A

b. False

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129
Q

Sea breeze is stronger than land breeze

A

a. True

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130
Q

The wind blows clockwise around low in a N-hemisphere

A

b. False

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131
Q

The wind blows clockwise around low in S-hemisphere

A

a. True

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132
Q

The wind blows anticlockwise around low in N-hemisphere

A

a. True

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133
Q

The wind blows anticlockwise around low in S- hemisphere

A

b. False

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134
Q

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

A

a. Gradient wind

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135
Q

Due to friction, from day to night for an isobaric pattern (in N hemisphere) Surface wind backs and lulls

A

a. True

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136
Q

The winds which spiral inward in a counter-clockwise direction in the NH are associated

with

A

c. Low pressure area

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137
Q

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

A

b. 23015 kt

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138
Q

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

A

b. Veering

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139
Q

A change from 270° to 250° is

A

a. Backing

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140
Q

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

A

a. Gust

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141
Q

Sudden change in wind speed from 10 kt to 30 kt for more than a minute or so is

A

a. Squall

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142
Q

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

A

b. True

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143
Q

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

storm

A

a. True

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144
Q

Rotor clouds have extremely turbulent flying conditions

A

b. True

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145
Q

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

A

a. 20/10*

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146
Q

If temperature is higher to the S and lower to the N from surface up to higher levels , then the wind will strengthen with height with no change in ___ direction in N hemisphere (direction)

A

b. Wly

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147
Q

Gradient wind is ___ of geostrophic wind in an anticyclone

A

c. Over estimate

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148
Q

Gale is

A

c. persistent strong winds exceeding 33 kt, associated with depression

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149
Q

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

A

b. Isotherms

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150
Q

Fog is reported when visibility is reduced to

A

a. Less than 1000 m

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151
Q

RVR is reported when visibility falls below

A

c. 1500 m

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152
Q

Radiation fog occurs

A

a. Over land

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153
Q

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

A

a. Mist

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154
Q

Radiation Fog forms over N India during ( months)

A

b. Dec to Feb

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155
Q

Warm and moist air moving over a cold ground gives rise to:

A

b. Fog and stratus

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156
Q

Warm and moist air moving over a cold surface causes

A

b. Advection Fog

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157
Q

The radiation fog forms due to

A

b. Radiational cooling of earth at night

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158
Q

The radiation fog activity increases after the passage of a…

A

a. WD

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159
Q

Radiation fog is essentially a ___ phenomena

A

a. Nocturnal

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160
Q

The radiation fog forms over

A

b. Land

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161
Q

The ___ fog forms due to horizontal movement of air

A

b. Advection

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162
Q

Advection fog forms during ( time)

A

c. any time of day and night

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163
Q

For formation of Radiation fog

A

b. There should be sufficient moisture in atmosphere, clear sky, light wind.

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164
Q

Instrument used for measuring visibility…

A

b. Transmissometer

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165
Q

Advection fog forms

A

c. both over land and sea

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166
Q

Drizzle occurs from

A

b. ST

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167
Q

Altostratus (AS) is

A

b. A medium cloud of sheet type

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168
Q

Showers occurs from

A

b. CB

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169
Q

Heavy icing is possible in

A

d. CB

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170
Q

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

A

a. Halo

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171
Q

Dark gray cloud giving continuous rain is called

A

b. NS

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172
Q

A uniform layer of cloud resembling fog but not on the ground

A

c. ST

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173
Q

The clouds composed of ice crystals having feathery appearance

A

a. CI

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174
Q

NS clouds occur

A

b. At warm front

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175
Q

Halo is associated with the cloud

A

c. CS

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176
Q

Corona is associated with the cloud

A

a. AS

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177
Q

Lenticular clouds indicate presence of

A

c. Mountain waves

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178
Q

The lowest level below which condensation trails will not form is

A

a. Mintra Level

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179
Q

Rain falling from cloud but not reaching ground is

A

b. Virga

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180
Q

CB with distinct anvil is called

A

b. Capillatus

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181
Q

Cloud ceiling is the height of the cloud covering

A

c. 5/8 or more

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182
Q

No condensation trails occur above

A

a. Maxtra Level

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183
Q

Cloud of operational significance has base below m or below the highest minimum sector altitude, which is greater

A

a. 1500

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184
Q

AC cloud with cumuliform protuberances are indicative of

A

b. Instability

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185
Q

Hail may be experienced under the anvil of a CB

A

a. True

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186
Q

DALR = 9.8 °C, ELR = 6.8 °C ; atmosphere is

A

a. stable

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187
Q

SALR = 5.5 °C, ELR= 4.5 °C ; atmosphere is

A

b. stable

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188
Q

DALR > ELR > SALR

A

a. conditionally unstable

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189
Q

Dry air is unstable when

A

b. ELR>DALR

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190
Q

The saturated air is said to be unstable if

A

b. SALR

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191
Q

If ELR = SALR - DALR the atmosphere is

A

c. Indifferent

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192
Q

DALR means:

A

a. The rate at which temperature of unsaturated parcel of air falls with height

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193
Q

The surface air temp, is 30° C. Assuming DALR prevailing what is the temperature at 2 km

A

b. 10° C

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194
Q

An Isothermal atmosphere is

A

a. Stable

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195
Q

If environmental lapse rate(ELR) is less than SALR, that part of the atmosphere is said to be:

A

c. Absolutely stable

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196
Q

DALR is approximately

A

c. 10 ° C /km

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197
Q

SALR at mean sea level is about

A

b. 5 ° C/Km

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198
Q

SALR approaches DALR

A

c. at -40°C

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199
Q

Dry air having a temperature of 35°C on surface when forced to rise adiabatically by 1 km would attain a temperature of

A

b. 25°C

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200
Q

Inversion in the atmosphere indicates

A

a. Stability

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201
Q

Inversion is ___ Lapse Rate (LR)

A

b. Negative

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202
Q

Environmental LR can be more than DALR

A

a. True

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203
Q

The process which to a large extent determines the vertical distribution of temperature in atmosphere is

A

a. Adiabatic

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204
Q

Rise in temperature with height is

A

a. Inversion

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205
Q

Inversion is common in (season)

A

c. Winters

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206
Q

Aurora Australis occur in the

A

a. S hemisphere

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207
Q

Aurora Australis called ___ Lights

A

b. Southern

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208
Q

Aurora Borealis occur in the

A

b. N hemisphere

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209
Q

Aurora Borealis are called ___ Lights

A

a. Northern

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210
Q

Corona occur in ___ clouds

A

a. AS

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211
Q

Bishop’s ring is due to the diffraction of light by fine particles of

A

b. dust

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212
Q

The radius of the Bishop’s ring is about

A

b. 22°

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213
Q

Superior Mirage occurs in marked

A

c. Inversion

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214
Q

Inferior Mirage occurs when there is

A

a. Lapse

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215
Q

Corona are formed due to the ___ of light

A

b. Diffraction

216
Q

Corona are formed due to light, passing through

A

d. Any one of all these

217
Q

Halo is produced by

A

a. Refraction

218
Q

Halo is produced when light passes through

A

b. ice crystals

219
Q

Halo occur in the cloud

A

c. CS

220
Q

Halo is luminous ring of ___ radius

A

b. 22°

221
Q

Halo round the sun shows a pure clear ___ on the outside

A

a. Red

222
Q

Halo signifies predominance in the cloud of

A

b. Ice crystals

223
Q

The cloud which cause Halo has ___ chances of ice accretion

A

a. negligible

224
Q

Sometimes a halo with a radius of ___ is observed, called Large Halo

A

b. 42°

225
Q

Halo occurs from ___ cloud

A

c. High

226
Q

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

A

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

227
Q

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

A

b. Cold Clouds

228
Q

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

A

a. Warm Clouds

229
Q

Coalescence Theory explains occurrence of rainfall from the

A

a. Warm Clouds

230
Q

Ice crystal Theory explains occurrence of rainfall from the

A

b. Cold Clouds

231
Q

Giant Nucleus Theory explains occurrence of rainfall over

A

a. Maritime areas

232
Q

Very heavy precipitation as showers over a short period is called

A

b. Cloud Burst

233
Q

Rain shadow area is on the of the mountain range

A

c. Leeward side

234
Q

Sleet is a mixture of

A

b. Rain & Snow

235
Q

Rainfall in the tropics is more in (season)

A

b. Summers

236
Q

Rainfall in the tropics is more in the (time)

A

b. Afternoon

237
Q

Rainfall in the temperate latitudes is more in (season)

A

a. Winters

238
Q

Over J&K and western Himalayas Rainfall is more in (season)

A

a. Winters

239
Q

Rainfall over coastal areas is more in the(time)

A

c. Night & early morning

240
Q

Areas to the_____ of western Ghats of India are rain shadow areas (direction)

A

c. E

241
Q

A sudden rise in the level of rivers or streams causing floods is called

A

c. Flash Floods

242
Q

Artificial rain making is also termed as

A

b. Cloud seeding

243
Q

Fog can be dispersed for a short period by artificial stimulation

A

a. True

244
Q

Showery precipitation occurs from

A

c. CB

245
Q

A day is called Rainy day when rainfall in 24 hr is ….mm or more

A

C.2.5 mm

246
Q

Hoar frost occurs on airframe in clear air when the temperature of airframe is ( not in numbers)

A

a. below the frost point

247
Q

In clouds at temperatures below 0° C an aircraft may encounter icing of the type

A

c. intermediate between these two

248
Q

Opaque Rime ice is

A

a. Light porous

249
Q

Rime is formed by freezing of ___ supercooled water droplets on aircraft is flying through clouds

A

a. Small

250
Q

The ___ ice poses serious aviation hazard

A

C. Glazed

251
Q

Airframe icing occurs below 0°C. Its probability of occurrence decreases progressively below -20 °C, as at lower temperatures the proportion of supercooled water drops in a cloud

A

b.Decreases

252
Q

CI, CS and CC clouds consist mostly ice crystals. Icing hazard is therefore

A

C. Negligible

253
Q

AS, NS consist of supercooled water drops and ice crystals in varying proportion icing is possible.

A

Light or moderate

254
Q

In AC clouds ___ icing is likely in mountainous areas

A

C. Severe

255
Q

In TCU icing may range from light to severe type at least up to ___ level. (Degree)

A

c. - 20 °C level

256
Q

In CB icing may range from light to severe type up to -20°C level. Below this temperature severe icing is

A

a. not significant

257
Q

Liquid water content is an important factor in icing. As the maximum water concentration is around , maximum ice formation in clouds may also be expected around that level. (Degree)

A

c. -15° C level

258
Q

Carburetor icing occurs when air from intake passes through a ventury (choke) and causes expansional cooling and vaporization of fuel. Serious icing can occur at extreme temperatures (degree)

A

b. 30°C to -10°C

259
Q

___ occurs in a moist cloudless air on an aircraft surface having temp, below 0° C, due to sublimation of water vapour onto feathery ice crystals.

A

c. Hoar Frost

260
Q

___ occurs in St, Sc, Ac, Cu, Ns at temperature -10 to -40° C and in Cb at temperature -20 to -40°C

A

a. Rime

261
Q

In clouds ___ occurs when a wide range of water drop sizes are present at temperatures between 0° C and -40° C

A

c. Mixture of rime and clear ice

262
Q

___ occurs in AS, NS, SC and towering CU or CB between 0° C and -20° C, in warm front below 0° C, especially if the aircraft has rapidly descended from a colder region

A

a. Glazed

263
Q

When fog freezes on parked aircraft it produces ___

A

a. Hoar Frost

264
Q

Icing the stalling speed appreciably

A

b. Increases

265
Q

The condition necessary for the formation of a thunderstorm are:

A

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

266
Q

Hail is most likely to fall from a cloud

A

c. Having strong vertical development

267
Q

Nor westers are

A

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

268
Q

Duststorm usually occurs over NW India during (season)

A

c. Pre-Monsoon

269
Q

A ‘mature’ thunderstorm has

A

c. Strong updrafts and downdrafts

270
Q

Aircraft icing is most favoured in the cloud which have temperatures ranging between (degrees)

A

b. 0° C and - 20° C

271
Q

A short duration, showery precipitation is associated with

A

c. CB

272
Q

Hail is

A

c. Solid precipitation falling from a deep convective cloud

273
Q

The most hazardous cloud for aviation is

A

a. CB

274
Q

The life of a Cb cell is usually

A

c. 1/2 - 1 hr

275
Q

Generally the severest activity of a CB clouds is for

A

b. 30 to 45 min

276
Q

Norwesters occur during ( months)

A

b. Mar-May

277
Q

Norwesters occur during

A

b. Hot weather

278
Q

Norwesters affect (area)

A

b. Bengal, Bihar, Orissa and Assam

279
Q

The trigger action may take place due to

A

b. Orographic lifting

280
Q

Norwesters normally occur during (time)

A

b. Afternoons

281
Q

Norwesters originates over

A

a. Chota-Nagpur hills

282
Q

Andhi (blinding storms) occur generally over

A

b. N India

283
Q

Wind speed in Light DS is

A

c. up to 21 kt

284
Q

The diameter of Microburst is

A

a. less than 4 km

285
Q

The diameter of and Macroburst

A

b. 4 km or more

286
Q

For detecting precipitation a Radar wavelength in the range ___ is suitable

A

a. 30 to 200 mm

287
Q

For airborne radars wavelength generally used

A

c. 60 mm

288
Q

The wavelength of TS detection X band radar is

A

c. 30 mm

289
Q

The wavelength of storm detection S band radar is

A

b. 100 mm

290
Q

Over plains TS mostly occur during the (time)

A

a. afternoon

291
Q

Over valley and foot hills TS generally occur during (time)

A

b. night & early morning

292
Q

Over the sea TS are more frequent (time)

A

b. night

293
Q

The life of Mesoscale Convective Complex TS is

A

c. 6 to 24 hr

294
Q

Loud peals of thunder, frequent flashes of lightning, moderate or heavy showers accompanied by light hail with maximum wind speed 15-40 kt is classified as

A

b. Moderate TS

295
Q

For a severe TS one of the requirements is strong wind shear

A

b. Vertical

296
Q

Severe TS cells are tilted

A

a. in vertical

297
Q

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

A

a. Polar maritime

298
Q

The air mass which originates over equatorial region is

A

b. Warm & Moist

299
Q

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

a. Cold Occlusion

300
Q

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

A

c. Cold & dry

301
Q

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

A

b. Warm Front

302
Q

At warm front

A

a. Warm air overtakes the cold air

303
Q

The conditions are always unstable at

A

a. Cold front

304
Q

Line squall occurs about 100-300 km ahead of

A

b. Cold front

305
Q

Precipitation occurs over a belt of 30 - 50 km on both side of front

A

a. Cold front

306
Q

Cold front moves at ___ the speed of a warm front moves

A

b. Double

307
Q

Line Squalls occur ___ of Cold front

A

a. Ahead

308
Q

Fronts are associated with

A

c. Extra-tropical Cyclones

309
Q

CB, Roll-type clouds, SC, AC with embedded CB are associated

A

a. Cold front

310
Q

The Surface of discontinuity between the Polar Easterlies and the temperate Westerlies is called

A

c. Polar Front

311
Q

The air mass which origir>ates from sea area located in lower Lat is

A

B. Warm & Moist

312
Q

WDs approach India as

A

b. Occluded Fronts

313
Q

Maximum WDs occur in (season)

A

c. Winters

314
Q

Ahead of a warm front the surface wind

A

B. Veers & strengthens

315
Q

On approach of a Warm Front temperature

A

b. Rise

316
Q

CI, CS, AS, NS, ST in sequence are associated with the front

A

a. Warm

317
Q

During the passage of a Cold Front winds

A

a. Suddenly become squally

318
Q

Visibility is poor in a Warm Front

A

b. Ahead & During

319
Q

Fog occurs in Cold Front

A

c. After

320
Q

WD is a ___ front

A

C occluded

321
Q

FZRA and FZFG occur ___ of a warm front

A

a. Ahead

322
Q

Precipitation ceases after the passage of a front

A

b. Warm

323
Q

During the approach of a Warm Front wind

A

a. Backs

324
Q

Whenever the low of a WD has two or more closed isobars, at 2 hPa interval, it is termed as

A

b. Western Depression

325
Q

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

A

a. 60 kt

326
Q

Jet stream has

A

b. one or more maxima

327
Q

The vertical wind shear in a Jet stream is about

A

a. 5m/s/ km

328
Q

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

A

Stronger

329
Q

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

A

b. Axis

330
Q

The wind speed along the axis of a jet stream is always

A

b. Not uniform

331
Q

Along the axis of a jet stream there are centres of high speed winds, these are called

A

a. Jet streaks

332
Q

In a wavy jet the Jet streaks are located over or near the

A

a. Ridge

333
Q

Sub-tropical Jet Stream (STJ) is (direction)

A

a. Westerly

334
Q

The normal position of Sub-tropical Jet Stream is

A

b. 27° N

335
Q

The southern most position of STJ is in February is

A

b. 22° N

336
Q

The STJ affects India from (months)

A

b. Oct to May

337
Q

STJ has a layered structure. There are often two layers of maximum wind to the ___ of jet core (direction)

A

a. S

338
Q

The STJ strengthens

A

c. Downstream

339
Q

At and near the STJ the temperature gradient is very

A

a. Small

340
Q

Vertical wind shear in STJ is greater the core

A

a. above

341
Q

The TJ prevails over the Indian Peninsula from (months)

A

c. Jun to Aug

342
Q

The TJ is located over the Indian Peninsula, approximately at

A

a. 13° N

343
Q

The TJ is located over Indian, approximately at a height of

A

a. 15 -16 km

344
Q

The TJ is strongest in (months)

A

a. July - Aug

345
Q

In the TJ the wind shears are much ___ than the STJ

A

b. less

346
Q

TJ is (direction)

A

b. Easterly

347
Q

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

A

a. 30°

348
Q

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

A

c. 7m/s

349
Q

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

A

a. 15 m/s

350
Q

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

A

b. Stable

351
Q

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

A

a. Unstable

352
Q

In Mountain waves the Rotor clouds form in

A

b. Ridges

353
Q

Clear air turbulence is often encountered

A

d. All of the above

354
Q

Most CAT occurs on the ___ of a jet stream and in the vicinity of upper level frontal zones where temperature contrasts are strong.

A

a. Fringes

355
Q

CAT is the bumpiness experienced by aircraft at high altitudes ___ in either cloud-free conditions or in stratiform clouds

A

a. above 18,000 feet

356
Q

When approaching an area where mountain waves have been reported, a pilot should expect:

A

d. All of the above

357
Q

Wind speed in a tropical severe cyclone is:

A

b. 48 - 63 kt

358
Q

Fronts are characteristic of:

A

b. Extra-tropical depressions

359
Q

During re-curvature, maximum weather in a monsoon depression occurs in

A

d. NE sector

360
Q

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

A

a. Ahead

361
Q

The well developed extra tropical cyclonic storm is composed of two main frontal systems and an occluded front, which varies in extent:

A

b. A low with a warm front radiating out Southwards followed by a cold front.

362
Q

The weather expected in a well developed cyclonic storm is:

A

b. Stormy weather

363
Q

Cyclone always approach land areas before they die

A

a. True

364
Q

The ___ is the most dangerous part of the cyclone is

A

a. eye wall

365
Q

No CS form

A

b. At Equator

366
Q

Life cycle of a tropical cyclone in India is

A

a. 3-4Days

367
Q

CS in Indian region are less intense because

A

a. They have a very short travel over the sea

368
Q

CS in India are mostly of intensity

A

c. Moderate

369
Q

Eye of a CS is surrounded by

A

b. Wall Clouds

370
Q

Surge is sudden strengthening of wind in the ___ air mass

A

a. Same

371
Q

During winters

A

c. Activity of Radiation fog increases after the passage of a WD over N India

372
Q

Low Temperatures and low humidity is the characteristic of (season)

A

D. Winter months

373
Q

Hot weather period is ( months)

A

b. Mar-May

374
Q

During hot weather

A

a. WDs cause TS / DS over Punjab & Rajasthan

375
Q

The monsoon current over the West coast of India is (direction)

A

a. SWly

376
Q

Monsoon period is ( months)

A

c. June to Sep

377
Q

The monsoon advances with

A

c. Bay of Bengal and Arabian sea currents

378
Q

The rainfall over India during monsoon depends on

A

c. The position of the axis of Monsoon Trough

379
Q

Rainfall occurs all over the country during monsoon when

A

a. Axis of MT is in its normal position along Gangetic plains

380
Q

Break in monsoon occurs when

A

b. Axis of monsoon trough is along foot hills of Himalayas

381
Q

With a depression over the head Bay fair weather during monsoon occurs over

A

a. Assam

382
Q

Monsoon is also called

A

b. SW monsoon

383
Q

Post monsoon weather period are (months)

A

c. Oct to Dec

384
Q

During post monsoon, pressure gradient over India is

A

a. weak

385
Q

During monsoon period, low pressure lies over

A

d. Pakistan

386
Q

During vigorous monsoon period the pressure gradient over west coast is

A

b. Steep

387
Q

An aircraft flying in Monsoon season from Chennai to Kolkata at 14 km will experience

winds

A

a. Easterly

388
Q

An aircraft flying in Winter season from Chennai to Kolkata at 12 km will experience winds

A

b. Wly

389
Q

An aircraft flying in Pre monsoon season from Delhi to Kolkata at 10 km will experience winds

A

b. Westerly

390
Q

An aircraft flying in Monsoon season from Mumbai to Ahmedabad at 03 km will experience winds

A

b. SWIy

391
Q

An aircraft flying in winter season from Delhi to Kolkata at 06 km will experience winds

A

d. NW - Wly

392
Q

An aircraft flying in winter season from Delhi to Kolkata at 06 km will experience

A

a. Port drift

393
Q

An aircraft flying in winter season from Kolkata to Nagpur at 02 km will experience

A

a. Port drift

394
Q

During break monsoon the pressures all over the country

A

a. Rise

395
Q

During break monsoon sometimes the surface winds over East UP and Bihar are

A

a. very strong

396
Q

Mid tropospheric cyclone occurs during

A

d. SW monsoon

397
Q

Mid tropospheric cyclone during monsoon form over

A

c. Gujarat

398
Q

El Nino episode is applied by fishermen to a period of reduced fish catch due to suppression of upwelling

A

a. warm surface coastal current

399
Q

Maximum cyclones occur over India in (season)

A

c. Post monsoon

400
Q

Tropical Jet stream occurs in India during

A

d. SW monsoon

401
Q

Pressure gradient over West Coast of India is steep during

A

d. SW monsoon

402
Q

During break in monsoon rain occurs

A

a. along foot hills

403
Q

The polewards moving air piles up in the subtropical regions and forms high pressure belt at the surface, called

A

(a) Subtropical high

404
Q

___ occurs over subtropical high

A

(c) subsidence

405
Q

The occurrence of large deserts near 30N and 30S are due to large scale

A

(a) subsidence

406
Q

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

(c) Doldrums

407
Q

The huge vertical circulations, one between the equator and 30N and another between equator and 30S, are called

A

(a) Hadley Cells

408
Q

The descending branch of the Hadley cell marked by calm winds and high pressure ar the surface are called

A

(c) Horse Latitudes

409
Q

The winds in the upper troposphere are westerly. These are known as

A

(c) Zonal Westerlies

410
Q

In the equatorial regions the upper tropospheric winds are (direction)

A

(b) Easterlies

411
Q

The disturbances of middle latitudes move from (direction)

A

(a) W to E

412
Q

The tropical disturbances which form in the equatorial low pressure belt move in

A

(b) Westerly direction

413
Q

Tropical disturbance which reach the zone of transition in the upper level flow change course and begin to move in a

A

(b) Opposite direction

414
Q

Latitudinally, on the average there is radiation in the tropics than in the polar regions

A

(a) surplus

415
Q

The systems like highs, lows, cyclonic circulation etc are associated with distinct types of weather. A study of the behaviour of these systems, known as

A

(a) Synoptic Meteorology

416
Q

Rising air creates calms or doldrums in the equatorial region

A

(c) Equatorial Doldrums

417
Q

Steady NE winds in the N hemisphere and SE winds in the S hemisphere are called:

A

{b) Trade Winds

418
Q

For non-scheduled National Flights an advance notice (before ETD} is required to be given to AMOs

A

(a) 3 hr

419
Q

For non-scheduled National Flights an advance notice (before ETD) is required to be given to AMSs

A

(b) 18-24 hr

420
Q

WAFS provides high quality en-route forecasts of ___ to Met Offices.

A

(a) high quality en-route forecasts of winds and temperature

421
Q

IMD has ___ Regional Met offices

A

(c) 6

422
Q

There are ___ Aerodrome Met Offices

A

(b) 17

423
Q

There are ___ Aeronautical Met Stations

A

(b) 51

424
Q

In AIREP the Met Information is contained in Section

A

(c) 3

425
Q

TAF are generally valid for

A

(c) 9hr

426
Q

The validity of Landing Forecast (TREND) is

A

(b) 2 hr

427
Q

Landing Forecast is append to

A

(a) METAR and SPECI

428
Q

Local Forecast is issued three times a day valid for next

A

(b) 8hr

429
Q

Local Forecast covers an area

A

(a) 50 NM

430
Q

Prognostic Charts are issued by

A

(a) RAFC

431
Q

Prognostic Charts are valid for

A

(b) 12 hr

432
Q

SIG Wx Chart are issued for Flight Levels

A

(a) below 460

433
Q

CODAR is

A

(c) Upper report from an aircraft (other than weather reconnaissance aircraft)

434
Q

WINTEM is

A

(b) Forecast upper wind and temperature

435
Q

SIGMET is a notice of severe weather for

A

(c) both, actual & expected

436
Q

SIGMET is issued for aircraft

A

(a) in flight

437
Q

SIGMET is issued by

A

(c) MWO

438
Q

SIGMET is valid for

A

(a) 4 hr

439
Q

SIGMET is nor issued for

A

(a) Rain

440
Q

AIRMET is SIGMET issued by a MWO for the safety of

A

(a) low-level aircraft

441
Q

GAMET is an area forecast in abbreviated plain language for

A

(b) low-level aircraft

442
Q

The validity of Airfield warnings is not exceeding

A

(b) 4 hr

443
Q

Airfield warning is issued for expected wind speed

A

(a) 30 kt

444
Q

Airfield warning is issued for wind direction of 20 kt changes by

A

(a) 45°

445
Q

Airfield Warning for gliders, light aircraft and helicopters is issued for expected wind speed

A

(b) 17 kt

446
Q

Wind Shear Warning is issued for the observed or expected wind shear above runway

A

(a) up to 500 m

447
Q

VOLMET is a MET information for aircraft

A

(b) in flight

448
Q

VOLMET Radio Telephony Broadcast made on HF Channel from

A

(c) both, Mumbai & Kolkata

449
Q

VOLMET consists of

A

(c) TAF and METAR

450
Q

In ROBEX the METAR/SPECI of international aerodromes and their alternates is exchanged

A

(b) outside India

451
Q

SIG Weather Charts are issued ___ times a day

A

(c) Four

452
Q

Visibility is reported in steps of 50 m when visibility is

A

(b) 0 to 800 m

453
Q

Visibility is reported in steps of 100 m when visibility is

A

(a) 800 m to 5000 m

454
Q

Visibility is reported in steps of 1000 m when visibility is

A

(c) 5000 m to 9999

455
Q

Visibility is reported 9999 when visibility is

A

(c) 10 km or more

456
Q

Temperature + 2.5°C is reported as

A

(b) 3°C

457
Q

Temperature 12.5°C is reported as

A

(c) M 12

458
Q

Pressure is rounded down to the nearest whole number in hectopascal

A

(c) lower value

459
Q

QNH 1002.6 hPa is reported as

A

(a) Q1002

460
Q

QNH 29.92 inches is reported as

A

(b) A2992

461
Q

Fog is reported when visibility is

A

(a) < 1000 m

462
Q

Mist is reported when visibility is

A

(b) 1000 to 5000m

463
Q

CAVOK signifies Visibility, Cloud ___ and present weather better can the prescribed values or conditions

A

(a) ceiling

464
Q

CAVOK is issued when visibility is

A

(b} 10 km or more

465
Q

CAVOK is issued when

(i) Visibility 10 km or more
(ii) No weather of significance.
(iii) No clouds below 1500 m or below the highest minimum sector altitude, which ever is greater and no cumulonimbus.

A

(c) All the three conditions

466
Q

SPECI is issued when

(i) Change in wind direction is ≥ 60° and speed before and/ after change ≥ 10 kt
(ii) Mean speed has changed by ≥ 10 kt
(ill) Variation from mean speed by ≥ 10 kt and speed before and/ after change ≥ 15 kt

A

(b) Any one condition

467
Q 
SPECI is issued when Clouds are
(i) BKN or OVC base at 30, 60, 150, 300, 450 m 
(ii) Cloud amount below 450 m changes:
From SKC/ FEW/ SCT to BKN / OVC OR 
From BKN/ OVC to SKC/ FEW/ SCT.
A

(a) Any one condition

468
Q

SPECI is issued for vertical visibility, by stations having Ceilograph, when sky is

A

(a) True

469
Q

WSRWY28 indicates that the wind shear has been reported for RW 28 in

A

(c) both take off and approach paths

470
Q

R26/M0150 in a METAR indicates that

A

(c) 150 m is the lowest RVR instrument can measure and RVR is less than 150 m

471
Q

Nacreous cloud occurre in

A

Upper stratosphere

472
Q

The atmosphere up to 80 km has a nearly similar composition and is called the homosphere. It’s uniform composition is due to

A

Gravitation of earth

473
Q

Half of the atmospheric mass is contained _______ below

A

20000 ft

474
Q

In jet standard atmosphere the lapse rate is

A

2*/1000

475
Q

The rate of fall of the temperature with height is called

A

Lapse rate

476
Q

In actual atmosphere the lapse rate could

A

Assume any value

477
Q

Tropical tropopause extends from the equator to Lat 30_40 over India it is found at about _______ a over this there is inversion

A

16 -16.5 km

478
Q

Inertial flow is

A

Anticyclonic in both hemispheres

479
Q

Fog is ____ cloud on ground

A

B. Stratus

480
Q

Frontal fog is more common with a

A

Warm front

481
Q

The favourable pressure system for formation of fog is

A

Highs and cols

482
Q

Thermal process / temperature distribution which favours of fog is

A

Inversion

483
Q

Glazed ice is formed by freezing of ____ supercooled water droplets on aircraft airframe flying through cloud

A

Large

484
Q

A WD originates over

A

Mediterranean, capstan and Black Sea

485
Q

Induced lows develop to the ______ of WD (direction)

A

S

486
Q

A jet stream cab be recognised by

A

Streaks of CI

487
Q

Flying right angles to a jet stream with falling pressure you will experience

A

Wind from left

488
Q

When abd where tropical jet stream occurs

A

In summers over SE Asia and central Africa

489
Q

Surge and shear line are features of ____ monsoon

A

Vigorous

490
Q

Peninsular discontinuity accuse along

A

Central peninsula

491
Q

Peninsular discontinuity occurs during

A

Pre monsoon

492
Q

Surge is also

A

Velocity convergence

493
Q

In a depression the wind speed is

A

17-27 Kt

494
Q

In a CS the wind speed is

A

34-47 kt

495
Q

A monsoon depression slopes ___ with height

A

SW

496
Q

Average life of a monsoon depression is

A

3-5 days

497
Q

Monsoon depressions move faster over

A

Plains

498
Q

For formation of CS sea surface temperature should be

A

26 -27* C

499
Q

In extra tropical cyclone family there are 3-4 CS or depression. One to the ____ of the other

A

SW

500
Q

In TRS the central pressure is about

A

1000-900 hPa

501
Q

TRS develop over

A

Sea

502
Q

TRS develop over ___ deg lat

A

5-15

503
Q

In TRS pressure gradient is very steep up to a radius of

A

100 km

504
Q

Extra tropical storm originates in

A

Polar front

505
Q

Extra tropical generally moves in the direction (direction)

A

W to E

506
Q

A tropical cyclone moves ___ in a day

A

300-500 hpa

507
Q

A tropical CS has outer storm area is about

A

> 400 km

508
Q

The up draughty in a CB cloud in India would normally be expected be the strongest in the thunderstorm of the

A

Pre monsoon season

509
Q

On a flight around FL 390 from Calcutta to Delhi in a day in February you would expect to get a

A

Winds with strong headwind component and sometime cross components

510
Q

Thunderstorms are most frequent in October/ nov over

A

Coastal Tamil Nadu

511
Q

On a day in July very heavy rain is reposted from Himalaya foot hills but there is little or no rain else where in the Gangetic plains. Such situation would. E associated with

A

A break situation in Monsoon

512
Q

First monsoon shower occurs over

A

Kerala

513
Q

During the break in monsoon rainfall occurs over

A

Tamil Nadu and Himalayas

514
Q

The winds at 45000 ft over Bangalore in July is

A

Strong easterly

515
Q

Maximum freq of fog is in (region)

A

NW India

516
Q

Thunderstorms frequency over west coast of India maximum in

A

August ( max in august sw monsoon )

517
Q

In the month of July Calcutta reports surface visibility as 500 meters. You would infer that the poor visibility is due to

A

Heavy rain

518
Q

Flying at FL 310 madras to Delhi on a day in January you would expect

A

Moderate westerly near Madras becoming very strong westerly near Delhi

519
Q

Thick fog occur in January over UP abd adjoining areas in association with western disturbance

A

In the rear of active one which have given rain

520
Q

The sun tropical jet stream passes over India during

A

October to may at around 200 MB level

521
Q

The southwest monsoon normally sets in over Bombay around

A

The beginning of second week of June

522
Q

When the axis the monsoon trough moves close to the foothills of Himalayas there is

A

Heavy rains in the hills

523
Q

Inside an active thunderstorm you would except to have the strongest downdraft in

A

Heavy rain zone

524
Q

The Chennai during early southwest monsoon season sea breeze can be expected when?

A

The monsoon current is weak

525
Q

The majority of northwesters which affect dum dum in APRIL/may originate in the neighbourhood of

A

Chota Nagpur

526
Q

Tropical cyclone most often strike the south Tamil Nadu coast in (months)

A

Sept/ oct

527
Q

Where would you expect the max thunderstorm activity in august

A

West coast of India

528
Q

Thunderstorms which occur in April/may in Bengal take place most frequently over Calcutta between (actual time)

A

1300 and 1700 hrs

529
Q

In a mature tropical cyclone. Eye area is characterised by

A

Calm windchill little clouding and practically no rain

530
Q

Cyclonic storm cross Tamil Nadu coast in (months)

A

Oct- Nov

531
Q

Cyclonic storms form over Indian seas during

A

Pre monsoon & post monsoon

532
Q

TRS occurs over Indian sea in Nm?

A

5-15* NM

533
Q

In the bay of Bengal during the months of July, august, monsoon depression form over

A

Over Head bay

534
Q

In a monsoon depression maximum weather occurs in

A

SW sector

535
Q

Cyclonic storms are confirmed almost entirely to the

A

Tropical latitudes

~ CPL/ Meteorology (1 decks)

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