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1) Fog is reported when visibility is reduced to
a) Less than 1000 m
b) 1000 m
c) 1000 to 2000
Explanation: Fog is reported when visibility is reduced to less than 1000 meters.
2) RVR is reported when visibility falls below
a) 500 m
b) 1000 m
c) 1500 m
Explanation: Runway Visual Range (RVR) is reported when visibility falls below 1500 meters.
3) Radiation fog occurs
a) Over land
b) Over sea
c) During day
Explanation: Radiation fog typically occurs over land, especially during the night or early morning.
4) When visibility reduces between 5000 m and 1000 m and RH is almost 100%, it is
a) Mist
b) Haze
c) Fog
Explanation: Visibility between 5000 meters and 1000 meters with high relative humidity indicates mist.
5) Radiation Fog forms over N India during
a) May to June
b) Dec to Feb
c) Oct to Nov
Explanation: In North India, radiation fog typically forms during December to February.
6) Warm and moist air moving over a cold ground gives rise to:
a) Thunder clouds
b) Fog and stratus
c) Frontal clouds
Explanation: Warm and moist air moving over a cold ground can lead to the formation of fog and stratus clouds.
7) Warm and moist air moving over a cold surface causes
a) Radiation Fog
b) Advection Fog
c) Frontal Fog
Explanation: Advection fog forms when warm, moist air moves over a colder surface.
8) The radiation fog forms due to
a) Heating of the earth during day
b) Radiational cooling of earth at night
c) Advection of cold air
Explanation: Radiation fog forms due to radiational cooling of the earth at night.
9) The radiation fog activity increases after the passage of a
a) WD
b) Depression
c) Col
Explanation: Radiation fog activity often increases after the passage of a WD.
10) Radiation fog is essentially a ……….. phenomena
a) Nocturnal
b) Dusk
c) Day
Explanation: Radiation fog is a nocturnal phenomenon that forms at night.
11) The radiation fog forms over
a) Water
b) Land
c) Both
Explanation: Radiation fog forms primarily over land due to cooling of the surface.
12) The ………. fog forms due to horizontal movement of warm moist air over cold surface
a) Radiation
b) Advection
c) Frontal
Explanation: Advection fog forms due to the horizontal movement of warm moist air over a cold surface.
13) Advection fog forms during
a) Night only
b) Day time only
c) Any time of day and night
Explanation: Advection fog can form at any time of day or night.
14) For formation of Radiation fog
a) There should be sufficient moisture in atmosphere, cloudy sky, nil wind
b) There should be sufficient moisture in atmosphere, clear sky, light wind.
c) There should be sufficient moisture in atmosphere, cloudy sky, strong wind
Explanation: Radiation fog requires sufficient moisture, clear skies, and light winds for formation.
15) Instrument used for measuring visibility is called ...
a) Visiometer
b) Transmissometer
c) Ceilometer
Explanation: The instrument used for measuring visibility is called a transmissometer.
16) Advection fog forms
a) Over sea
b) Over Land
c) Both over land and sea
Explanation: Advection fog can form over both land and sea.
17) Fog is ……… cloud on ground
a) Stratocumulus
b) Stratus
c) Nimbostratus
Explanation: Fog is essentially a stratus cloud that forms on the ground.
18) Frontal fog is more common with a
a) Western Disturbance
b) Cyclone
c) Warm Front
d) Cold Front
Explanation: Frontal fog is more commonly associated with warm fronts.
19) The favourable pressure system for formation of fog is
a) Lows and Cols
b) High and Trough
c) Lows and Ridges
d) Highs and Cols
Explanation: Fog formation is favored by high pressure systems and cols.
20) Thermal processes / temperature distribution which favours formation of fog is
a) Isothermal
b) Adiabatics
c) Inversion
d) SALR
Explanation: Inversion is a thermal process that favors the formation of fog.

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