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