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MET-BNC-MODULE9
1.
An aircraft is flying at FL 80. The local QNH is 1000 hPa. After the second altimeter has been adjusted to the local QNH, the reading will be approximately
a) 7650 FT.
b) 8350 FT.
c) 8000 FT.
d) 8600 FT.
2.
The barometric compensator of an altimeter is locked on reference 1013.2 hPa. The aircraft has to land on a point with an elevation of 290 feet where the QNH is 1023 hPa. The reading on the altimeter on the ground will be:
a) 11 FT.
b) -10 FT.
c) 20 FT.
d) 560 FT.
3.
A microburst phenomenon can arise in the
a) downdraught of a cumulonimbus at the mature stage.
b) updraught of a cumulonimbus at the growth stage.
c) downdraught of a cumulonimbus at the formation stage.
d) updraught of a cumulonimbus at the mature stage.
4.
While approaching your destination aerodrome you receive the following message: RVR runway 23: 400m This information indicates the
a) portion of runway which a pilot on the threshold of any of the runways would see, with runway 23 in service.
b) visibility on runway 23.
c) length of runway which a pilot in an aircraft on the ground would see, on the threshold of runway 23.
d) minimum visibility at this aerodrome, with runway 23 being the one in service.
5.
What is the meaning of the abbreviation "SCT" ?
a) 1 - 4 oktas
b) 5 - 7 oktas
c) 1 - 2 oktas
d) 3 - 4 oktas
6.
An airborne weather radar installation makes it possible to detect the location of
a) zones of precipitation, particularly liquid-state precipitation, and also their intensity
b) cumulonimbus, but provided that cloud of this type is accompanied by falls of hail
c) stratocumulus and its vertical development
d) all clouds
7.
The upper wind and temperature chart of 250 hPa corresponds, in a standard atmosphere, to about
a) 30 000 FT
b) 34 000 FT
c) 39 000 FT
d) 32 000 FT
8.
Marseille Information gives you the following meteorological information for Ajaccio and Calvi for 1600 UTC: Ajaccio: wind 360°/2 kt, visibility 2000 m, rain, BKN stratocumulus at 1000 FT, OVC altostratus at 8000 FT, QNH 1023 hPa. Calvi: wind 040°/2 kt, visibility 3000 m, mist, FEW stratus at 500 FT, SCT stratocumulus at 2000 FT, OVC altostratus at 9000 FT, QNH 1023 hPa. The ceilings are therefore:
a) 1000 FT at Ajaccio and 2000 FT at Calvi
b) 1000 FT at Ajaccio and 500 FT at Calvi
c) 1000 FT at Ajaccio and 9000 FT at Calvi
d) 8000 FT at Ajaccio and 9000 FT at Calvi
9.
Extensive cloud and precipitation is often associated with a non frontal thermal depression because of:
a) surface divergence and upper level convergence causing widespread descent of air in the depression
b) surface convergence and upper level divergence causing widespread ascent of air in the depression
c) surface divergence and upper level convergence causing widespread ascent of air in the depression
d) surface convergence and upper level divergence causing widespread descent of air in the depression
10.
The equatorial easterly jet is a jet stream that occurs:
a) only in the winter of the northern hemisphere at approx. 30 000 FT
b) during the whole year in the southern hemisphere
c) only in the summer of the northern hemisphere at approx. 45 000 FT
d) during the whole year in the northern hemisphere
11.
All pilots encountering Clear Air Turbulence are requested to report it. You experience CAT which causes passengers and crew to feel definite strain against their seat belt or shoulders straps. Unsecured objects are dislodged. Food service and walking are difficult. This intensity of CAT should be reported as
a) light
b) extreme
c) severe
d) moderate
12.
Going from the equator to the north pole, the altitude of the tropopause
a) increases and its temperature decreases
b) increases and its temperature increases
c) decreases and its temperature increases
d) decreases and its temperature decreases
13.
The troposphere is the
a) part of the atmosphere below the tropopause
b) part of the atmosphere above the stratosphere
c) boundary between the stratosphere and the mesosphere
d) boundary between the mesosphere and thermosphere
14.
The tropopause is a level at which
a) temperature ceases to fall with increasing height
b) pressure remains constant
c) vertical currents are strongest
d) water vapour content is greatest
15.
The tropopause is lower
a) in summer than winter in moderate latitudes
b) over the North Pole than over the equator
c) over the equator than over the South Pole
d) south of the equator than north of it
16.
The temperature at 10000 FT in the ICAO Standard Atmosphere is:
a) 0°C
b) -20°C
c) -35°C
d) -5°C
17.
What of the following is the most important constituent in the atmosphere from a weather stand-point ?
a) Nitrogen
b) Water vapour
c) Oxygen
d) Hydrogen
18.
The average height of the tropopause at 50°N is about
a) 8 km
b) 11 km
c) 16 km
d) 14 km
19.
The height and the temperature of the tropopause are respectively in the order of
a) 8 km and - 75°C over the poles
b) 16 km and -75°C over the equator
c) 8 km and -40°C over the equator
d) 16 km and -40°C over the poles
20.
An inversion is a layer of air in which the temperature
a) decreases with height more than 1°C/100m
b) remains constant with height
c) increases with height
d) decreases with height less than 1°C/100m
21.
An isothermal layer is a layer of air in which the temperature
a) increases with height at a constant rate
b) decreases with height at a constant rate
c) increases with height
d) remains constant with height
22.
An inversion is a layer of air which is
a) absolutely unstable
b) absolutely stable
c) conditionally unstable
d) conditionally stable
23.
The environmental lapse rate in an actual atmosphere
a) has a fixed value of 2°C/1000 FT
b) has a fixed value of 0.65°C/100m
c) varies with time
d) has a fixed value of 1°C/100m
24.
The dry adiabatic lapse rate has a value of
a) 0.5°C/100m
b) 0.65°C/100m
c) 2°C/1000FT
d) 1°C/100m
25.
The dry adiabatic lapse rate
a) has a variable value
b) is greater in summer than in winter
c) is greater during the night than during the day
d) has a constant fixed value
26.
An air mass is called stable when
a) the environmental lapse rate is high, with little vertical motion of air currents
b) the temperature in a given air mass decreases rapidly with height
c) the vertical motion of rising air tends to become weaker and disappears
d) the pressure in a given area is constant
27.
In the ICAO Standard Atmosphere the decrease in temperature with height below 11 km is
a) 1°C per 100m
b) 0.5°C per 100m
c) 0.65°C per 100m
d) 0.6°C per 100m
28.
Which statement is correct regarding the ICAO Standard Atmosphere ?
a) At MSL pressure is 1013.25 hPa and the decrease of temperature with height is 1°C per 100m
b) At MSL temperature is 10°C and the decrease in temperature with height is 1°C per 100m
c) At MSL temperature is 15°C and pressure is 1013.25hPa
d) At MSL temperature is 15°C and the decrease in temperature with height is 1°C per 100m
29.
QNH is defined as
a) QFE reduced to MSL using the values of the standard atmosphere
b) pressure at MSL in the actual atmosphere
c) QFE reduced to MSL using the values of the actual atmosphere
d) pressure at MSL in the standard atmosphere
30.
Which of the following statements is true ?
a) QNH is always higher than QFE
b) QNH can be equal to QFE
c) QNH is always lower than QFE
d) QNH is always equal to QFE
31.
Which statement is true ?
a) QNH can be lower as well as higher than 1013.25 hPa
b) QNH can not be 1013.25 hPa
c) QNH is lower than 1013.25 hPa at any time
d) QNH can be 1013.25 hPa only for a station at MSL
32.
When the subscale is set to the QNH of an airfield the pressure altimeter indicates
a) zero while landing
b) elevation while landing only if conditions are as in the ICAO Standard Atmosphere
c) elevation while landing
d) zero while landing only if conditions are as in the ICAO Standard Atmosphere
33.
Advection is:
a) horizontal motion of air
b) vertical motion of air
c) the same as convection
d) the same as subsidence
34.
Subsidence is:
a) horizontal motion of air
b) vertically downwards motion of air
c) the same as convection
d) vertically upwards motion of air
35.
The radiation of the sun heats
a) the air in the troposphere directly
b) the water vapour in the air of the troposphere
c) the air in the troposphere only directly if no clouds are present
d) the surface of the earth, which heats the air in the troposphere
36.
The diurnal variation in temperature is largest when
a) the sky is overcast and the wind is strong
b) the sky is overcast and the wind is weak
c) the sky is clear and the wind is weak
d) the sky is clear and the wind is strong
37.
Rising air cools because
a) it expands
b) it contracts
c) surrounding air is cooler at higher levels
d) it becomes more moist
38.
A layer can be
a) unstable for unsaturated air and neutral for saturated air
b) stable for saturated air and unstable for unsaturated air
c) unstable for unsaturated air and conditionally unstable
d) stable for unsaturated air and unstable for saturated air
39.
In a layer of air the decrease in temperature per 100 metres increase in height is more than 1°C. This layer can be described as being
a) conditionally unstable
b) absolutely unstable
c) absolutely stable
d) conditionally stable
40.
Which statement is true for a conditionally unstable layer?
a) The environmental lapse rate is less than 0.65°C/100m
b) The layer is unstable for unsaturated air
c) The wet adiabatic lapse rate is 0.65°C/100m
d) The environmental lapse rate is less than 1°C/100m
41.
The stability in a layer is increasing if
a) warm and moist air is advected in the lower part
b) warm air is advected in the lower part and cold air in the upper part
c) cold and dry air is advected in the upper part
d) warm air is advected in the upper part and cold air in the lower part
42.
Which of the following statements concerning the lifting of a parcel of air is correct ?
a) Unsaturated parcels cool less rapidly than saturated parcels
b) Unsaturated parcels cool more rapidly than saturated parcels
c) Saturated parcels always cool at a rate of 0.65°C per 100m
d) Unsaturated parcels cool at a rate of 0.65°C per 100m
43.
When in the upper part of a layer warm air is advected the
a) stability decreases in the layer
b) wind speed will always decrease with increasing height in the northern hemisphere
c) wind will back with increasing height in the northern hemisphere
d) stability increases in the layer
44.
Relative humidity
a) is higher in warm air than in cool air
b) increases if the air is cooled whilst maintaining the vapour pressure constant
c) decreases if the air is cooled whilst maintaining the vapour pressure constant
d) is higher in cool air than in warm air
45.
The dewpoint temperature
a) is always higher than the air temperature
b) is always lower than the air temperature
c) can not be equal to the air temperature
d) can be equal to the air temperature
46.
Relative humidity depends on
a) moisture content and pressure of the air
b) temperature of the air only
c) moisture content and temperature of the air
d) moisture content of the air only
47.
The dewpoint temperature
a) can not be equal to the air temperature
b) can be reached by cooling the air whilst keeping pressure constant
c) can be reached by lowering the pressure whilst keeping temperature constant
d) can not be lower than the air temperature
48.
When water evaporates into unsaturated air
a) relative humidity is decreased
b) relative humidity is not changed
c) heat is absorbed
d) heat is released
49.
A moist but unsaturated parcel of air becomes saturated by
a) moving the parcel to an area with higher pressure and equal temperature
b) lifting the parcel to a higher level
c) moving the parcel to an area with lower pressure and equal temperature
d) lowering the parcel to a lower level
50.
A sample of moist but unsaturated air may become saturated by
a) expanding it adiabatically
b) compressing it adiabatically
c) raising the temperature
d) lowering the pressure, keeping temperature constant
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