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