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Question Bank
Questions for IC VISIBILITY & FOG
Answer the following questions
Test Mode
Training Mode
1. The _____ fog forms due to horizontal movement of warm moist air over cold surface
Frontal
Advection
Radiation
2. Thermal processes/temperature distribution which favours formation of fog is
Inversion
Adiabetic
SALR
Isothermal
3. Warm and moist air moving over a cold surface causes
Advection Fog
Frontal Fog
Radiation Fog
4. For formation of Radiation fog
There should be sufficient moisture in atmosphere, clear sky, light wind
There should be sufficient moisture in atmosphere, cloudy sky, nil wind
There should be sufficient moisture in atmosphere, clear sky, strong wind
5. Frontal Fog is more common with a
Warm Front
Cyclone
Cold Front
Western Disturbance
6. Instrument used for measuring visibility is called
Ceilometer
Transmissometer
Visiometer
7. Advection fog forms
both over land and sea
over sea
over land
8. Advection fog forms during
day time only
any time of day and night
night only
9. Fog is ______ cloud on ground
Nimbostratus
Stratocumulus
Stratus
10. The _____ fog forms due to horizontal movement of warm moist air over cold surface
Frontal
Radiation
Advection
11. Fog is ______ cloud on ground
Stratocumulus
Nimbostratus
Stratus
12. Warm and moist air moving over a cold ground gives rise to
Thunder clouds
Frontal clouds
Fog and stratus
13. Fog is reported when visibility is reduced to
Less than 1000 m
1000 to 2000
1000 m
14. Radiation fog is essentially a ______ phenomena
Day
Nocturnal
Dusk
15. For formation of Radiation fog
There should be sufficient moisture in atmosphere, cloudy sky, nil wind
There should be sufficient moisture in atmosphere, clear sky, strong wind
There should be sufficient moisture in atmosphere, clear sky, light wind
16. Radiation Fog forms over N India during
Oct to Nov
Dec to Feb
May to June
17. The radiation fog activity increases after the passage of a
Col
Depression
WD
18. When visibility reduces between 5000m and 1000m and RH is almost 100%, it is
Fog
Mist
Haze
19. The radiation fog forms over
Both
Land
Water
20. Advection fog forms
both over land and sea
over land
over sea
21. Frontal Fog is more common with a
Cold Front
Warm Front
Cyclone
Western Disturbance
22. Instrument used for measuring visibility is called
Visiometer
Transmissometer
Ceilometer
23. Advection fog forms during
any time of day and night
day time only
night only
24. RVR is reported when visibility falls below
1000 m
500 m
1500 m
2000 m
25. The radiation fog forms due to
Radiational cooling of earth at night
Heating of the earth during day
Advection of cold air
26. Radiation fog occurs
Over land
Over sea
During day
27. Frontal Fog is more common with a
Western Disturbance
Warm Front
Cyclone
Cold Front
28. The radiation fog forms over
Both
Land
Water
29. The favourable pressure system for formation of fog is
Highs and Cols
Lows and Ridges
High and Trough
Lows and Cols
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