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CPL Test Series
Question Bank
Questions for VISIBILITY
Answer the following questions
Test Mode
Training Mode
1. Which type of fog is likely to form when air having temperature of 15°C and dew point of 12°C blows at 10 knots over a sea surface having temperatures of 5°C?
Frontal fog
Steam fog
Advection fog
Radiation fog
2. At what time of day, or night, is radiation fog most likely to occur?
Shortly after midnight.
Shortly after sunrise.
At sunset
Late evening
3. Steaming fog (arctic sea smoke) occurs in air
with warm mass properties
that is absolutely stable
that is stable
with cold mass properties
4. What is the average vertical extent of radiation fog?
2,000 ft.
10,000 ft
500 ft.
5,000 ft.
5. Advection is
horizontal motion of air.
the same as subsidence
the same as convection.
vertical motion of air
6. Which of the following conditions is most likely to lead to the formation of steam fog (arctic smoke)?
Cold air moving over warm water
The coastal region of the sea cools at night
Warm air moving over cold water
The sea is warmed by strong radiation from the sun
7. Which of the following statements is true concerning advection fog?
It forms when unstable air is cooled adiabatically
It forms at night or the early morning
It forms slowly and disappears rapidly
It can be formed suddenly by day or night
8. In general, the meteorological visibility during rainfall compared to during drizzle is
less.
in rain - below 1 km, in drizzle - more than 2 km.
greater.
the same.
9. While approaching your target aerodrome you receive the following message: RVR runway 23: 400m. This information indicates the
portion of runway which a pilot on the threshold of any of the runways would see, with runway 23 in service
meteorological visibility on runway 23
length of runway which a pilot in an aircraft on the ground would see, on the threshold of runway 23
minimum visibility at this aerodrome, with runway 23 being the one in service
10. Which of the following circumstances most favour the development of radiation fog?
Maritime tropical air flowing over cold sea
Moist air over land during clear night with little wind.
Advection of very cold air over much warmer sea
Warm moist air at the windward side of a mountain.
11. What wind conditions, occurring just before dawn, favour the formation of fog at an airport where the temperature is 15°C and the dew point is 14°C?
Easterly, 10kt.
Westerly, 10kt variable.
Northerly, 10kt
Calm.
12. A significant inversion at low height is a characteristic of
the passage of cold front
cumulus clouds
terrestrial radiation
advection fog
13. When is the RVR reported at most airports?
When the meteorological visibility decreases below 1500m
When the meteorological visibility decreases below 800m
When the RVR decreases below 2000m
When the RVR decreases below 800m
14. In unstable air, surface visibility is most likely to be restricted by
haze.
drizzle.
low stratus.
showers of rain or snow.
15. What conditions are most likely to lead to the formation of hill fog?
Humid stable air mass, wind blowing towards the hills
Precipitation which is lifted by the action of moderate winds striking the range
Clear skies, calm or light winds, with relatively low humidity
High relative humidity and an unstable air mass
16. The range of wind speed in which radiation fog is most likely to form is
below 5kt
between 10 and 15kt
between 5 and 10kt
above 15kt
17. Advection fog can be formed when
cold moist air flows over a warmer surface..
warm moist air flows over a warmer surface.
cold moist air flows over warmer water.
warm moist air flows over a colder surface.
18. Which of the following is most likely to lead to the dissipation of radiation fog ?
A build up of a high pressure area resulting in adiabatic warming associated with a sinking air mass
A marked decrease in wind velocity close to the ground
A marked increase in wind velocity near the ground
Ground cooling caused by radiation during the night
19. Under which of these conditions is radiation fog most likely to form?
Little or no cloud.
Very dry air.
Strong surface winds.
Very low temperatures
20. What are the differences between radiation fog and advection fog ?
Radiation fog forms due to surface cooling at night in a light wind. Advection fog forms when warm humid air flows over a cold surface
Radiation fog is formed by surface cooling in a calm wind. Advection fog is formed by evaporation over the sea
Radiation fog forms only on the ground, advection fog only on the sea
Radiation fog forms due to night cooling and advection fog due to daytime cooling
21. Below a low level inversion visibility is often
very good at night
very good in the early morning
moderate or poor because there is no vertical exchange
moderate or poor due to heavy snow showers
22. When the temperature and dew point are less than one degree apart the weather conditions are most likely to be
fog or low cloud
unlimited visibility
high scattered clouds.
clear and cool.
23. Which of the following is most likely to lead to the formation of radiation fog?
Cold air passing over warm ground.
Dry, warm air passing over warm ground
The passage of fronts
Heat loss from the ground on clear nights
24. In the vicinity of industrial areas, smoke is most likely to affect surface visibility when
there is a low level inversion
the surface wind is strong and gusty
a rapid moving cold front has just passed the area
cumulus clouds have developed in the afternoon
25. What is the relationship between meteorological visibility and RVR in homogeneous fog?
The met. vis. generally is the same as the RVR
The met. vis. is generally less than the RVR.
There is no specific relationship between the two.
The met. vis. generally is greater than the RVR.
26. Which of the following weather conditions favour the formation of radiation fog?
Strong wind, little or no cloud, moist air.
Light wind, little or no cloud, moist air.
Light wind, extensive cloud, moist air
Light wind, extensive cloud, dry air
27. Frontal fog is most likely to occur
in winter in the early morning
in rear of a warm front
in advance of a warm front
in summer in the early morning
28. Visibility is reduced by haze when
dust particles are trapped below an inversion
a cold front just passed
small water droplets are present
a light drizzle falls
29. Which of the following conditions is most likely to lead to the formation of advection fog ?
Moist cold air moving over a warm surface.
Dry warm air moving over a cold surface.
Moist warm air moving over a cold surface.
Dry cold air moving over a warm surface
30. The most likely reason for radiation fog to dissipate or become low stratus is
a low level temperature inversion.
increasing surface wind speed.
an increasingly stable atmosphere.
surface cooling.
31. When does frontal fog, also known as mixing fog, occur?
When very humid warm air meets with very humid cold air
When very humid cold air meets with dry warm air
When very dry cold air meets with very dry warm air
When very humid warm air meets with dry cold air
32. What type of fog is most likely to form over flat land during a clear night, with calm or light wind conditions?
Radiation.
Advection.
Advection.
Orographic.
33. Flight visibility from the cockpit during approach in a tropical downpour can decrease to minimal
about 1000m
about 500m
tens of metres
about 200m
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