8814. The troposphere is the:
A – part of the atmosphere above the stratosphere
B – part of the atmosphere below the tropopause
C – boundary between the mesosphere and thermosphere
D – boundary between the stratosphere and the mesosphere
Ref: all
Ans: B
8817. What is the boundary layer between troposphere and
stratosphere called:
A – Tropopause
B – Ionosphere
C – Stratosphere
D – Atmosphere
Ref: all
Ans: A
8824. The amount of water vapour which air can hold largely
depends on:
A – relative humidity
B – air temperature
C – stability of air
D – dew point
Ref: all
Ans: B
8876. The tropopause is a level at which:
A – vertical currents are strongest
B – water vapour content is greatest
C – pressure remains constant
D – temperature ceases to fall with increasing height
Ref: all
Ans: D
8889. The tropopause is lower;
A – south of the equator than north of it
B – in summer than winter in moderate latitudes
C – over the North pole than over the equator
D – over the equator than over the South Pole
Ref: all
Ans: C
10050. What is the approximate composition of the dry air by
volume in the
troposphere?
A – 21% oxygen, 78% nitrogen, and the rest other gases
B – 10% oxygen, 89% nitrogen, and the rest other gases
C – 88% oxygen, 9% nitrogen, and the rest other gases
D – 50% oxygen, 40$ nitrogen and the rest other gases
Ref: all
Ans: A
10055. In which layer is most of the atmospheric humidity
concentrated?
A – Troposphere
B – Tropopause
C – Stratosphere
D – Stratopause
Ref: all
Ans: A
10061. The thickness of the troposphere varies with:
A – latitude
B – longitude
C – rotation of the earth
D – the wind
Ref: all
Ans: A
10102. Going from the equator to the north pole, the altitude of
the tropopause:
A – increases and its temperature increases
B – decreases and its temperature increases
C – increases and its temperature decreases
D – decreases and its temperature decreases
Ref: all
Ans: B
10753. In the mid-latitudes the stratosphere extends on an
average from:
A – 85 to more than 200 km
B – 0 to 11 km
C – 50 to 85 km
D – 11 to 50 km
Ref: all
Ans: D
10804. Which layer of the atmosphere contains more than 90 per
cent of all water
vapour?
A – Troposphere
B – Lower stratosphere
C – Upper stratosphere
D – Ionosphere
Ref: all
Ans: A
10825. Which one of the following statement applies to the
tropopause?
A – It is, by definition, a temperature inversion
B – It is, by definition, an isothermal layer
C – It indicates a strong temperature lapse rate
D – It separates the troposphere from the stratosphere
Ref: all
Ans: D
10846. The average height of the tropopause at 50oN is about:
A – 14 km
B – 8 km
C – 11 km
D – 16 km
Ref: all
Ans: C
10851. The troposphere:
A – has a greater vertical extent above the equator than above
the poles
B – contains all oxygen of the stratosphere
C – is the separation layer between the stratosphere and
atmosphere
D – reaches the same height at all latitudes
Ref: all
Ans: A
10855. How does the height of the tropopause normally vary with
latitude in the
northern hemisphere?
A – It remains constant throughout the year
B – It remains constant from north to south
C – It increases from south to north
D – It decreases from south to north
Ref: all
Ans: D
10896. What, approximately, is the average height of the
tropopause over the equator?
A – 40 km
B – 8 km
C – 11km
D – 16 km
Ref: all
Ans: D
15783. Why are indications about the height of the tropopause
not essential for flight
documentation in the tropics?
A – The tropopause is generally well above the flight level
actually flown
B – The meteorological services are unable to provide such a
chart
C – The temperatures of the tropical tropopause are always very
cold and
therefore not important
D – Tropopause information are of no value
Ref: all
Ans: A
15790. What is the most likely temperature at the tropical
tropopause?
A – -25oC
B – -75oC
C – -55oC
D – -35oC
Ref: all
Ans: B
15820. Half the mass of the atmosphere is found in the first:
A – 5 km
B – 3 km
C – 8 km
D – 11 km
Ref: all
Ans: A
15849. What of the following is the most important constituent in
the atmosphere
from a weather stand point?
A – Hydrogen
B – Water vapour
C – Nitrogen
D – Oxygen
Ref: all
Ans: B
15850. The height and the temperature of the tropopause are
respectively in the order
of:
A – 16 km and -40oC over the poles
B – 16 km and -75oC over the equator
C – 8 km and -40oC over the equator
D – 8 km and -75oC over the poles
Ref: all
Ans: B
16572. The troposphere is:
A – deepest over the equator
B – deepest over the poles
C – the same depth all over the earth
D – shallowest over the poles in summer
Ref: all
Ans: A
24289. In relation to the total weight of the atmosphere, the
weight of the atmosphere
between mean sea level and a height of 5500m is:
A – 25%
B – 1%
C – 50%
D – 99%
Ref: all
Ans: C
24425. Which of the following statements concerning the
tropopause is correct?
A – The temperature of the tropopause at the equator and at the
poles is equal
B – The temperature remains constant above and below the
tropopause
C – The temperature of the tropopause at the equator is higher
than at the
poles
D – The temperature lapse rate changes abruptly at the
tropopause
Ref: all
Ans: D
24440. Which statement concerning the tropopause is correct?
A – The temperature at the tropopause is approximately -80oC
over the Poles
and approximately -40oC over the equator
B – Above the tropopause no clear air turbulence occurs
C – in the ICAO standard atmosphere the tropopause lies higher
over the Poles
than over the equator
D – The layer just above the tropopause is absolutely stable
Ref: all
Ans: D
050-01-02 Temperature
8808. Which is true of the temperature at the tropopause?
A – It is higher in polar regions than in equatorial regions
B – It is higher in equatorial regions than in polar regions
C – It is highest in middle latitudes
D – There is no significant difference with change of latitude
Ref: all
Ans: A
8810. Several physical processes contribute to atmospheric
warming. Which of the
following contribute the most?
A – Absorption and evaporation
B – Solar radiation and conduction
C – Absorption and vaporisation
D – Convection and condensation
Ref: all
Ans: D
8833. An outside air temperature of -35oC is measured while
cruising at FL 200.
What is the temperature deviation from the ISA at this level?
A – 5oC colder than ISA
B – 10oC warmer than ISA
C – 5oC warmer than ISA
D – 10oC colder than ISA
Ref: all
Ans: D
8856. A layer can be:
A – unstable for unsaturated air and conditionally unstable
B – stable for saturated air and unstable for unsaturated air
C – unstable for unsaturated air and neutral for saturated air
D – stable for unsaturated air and unstable for saturated air
Ref: all
Ans: D
8858. At a certain position, the temperature on the 300 hPa chart
is -48oC; according
to the tropopause chart, the tropopause is at FL 330. What is the
most likely
temperature at FL 350?
A – -56.5oC
B – -50oC
C – -54oC
D – -58oC
Ref: all
Ans: C
8864. Absolute instability exists whenever the environmental
lapse rate:
A – exceeds the saturated adiabatic lapse rate
B – exceeds the dry adiabatic lapse rate
C – is less than the saturated adiabatic lapse rate
D – is between the dry and saturated adiabatic lapse rate
Ref: all
Ans: B
8887. A significant inversion at low height is a characteristic of:
A – the passage of cold front
B – nocturnal radiation
C – advection fog
D – cumulus clouds
Ref: all
Ans: B
8890. An inversion is a layer of air which is:
A – absolutely unstable
B – absolutely stable
C – conditionally unstable
D – conditionally stable
Ref: all
Ans: B
8898. An inversion is:
A – an increase of temperature with height
B – an increase of pressure with height
C – a decrease of pressure with height
D – a decrease of temperature with height
Ref: all
Ans: A
10024. When in the upper part of a layer warm air is advected
the
A – stability increases in the layer
B – stability decreases in the layer
C – wind will back with increasing height in the northern
hemisphere
D – wind speed will always decrease with increasing height in the
northern
hemisphere
Ref: all
Ans: A
10028. Advection is:
A – the same as convection
B – vertical motion of air
C – the same as subsidence
D – horizontal motion of air
Ref: all
Ans: D
10038. The environmental lapse rate in an actual atmosphere:
A – has a fixed value of 2oC/1000 ft
B – has a fixed value of 1oC/100m
C – has a fixed value of 0.65oC/100m
D – varies with time
Ref: all
Ans: D
10066. In the lower part of the stratosphere the temperature:
A – decreases with altitude
B – is almost constant
C – increases with altitude
D – increases at first and decreases afterward
Ref: all
Ans: B
10068. An isothermal layer is a layer of air in which the
temperature:
A – increases with height at a constant rate
B – increases with height
C – decreases with height at a constant rate
D – remains constant with height
Ref: all
Ans: D
10074. Which of the following is a common result of subsidence?
A – Clear air turbulence at higher altitudes
B – CB-clouds and thunderstorms over a large sea
C – Wide spread NS and AS clouds and intense precipitation
D – An inversion over a large area with haze, mist
Ref: all
Ans: D
10083. An air mass is called stable when:
A – the vertical motion of rising air tends to become weaker and
disappears
B – the temperature in a given air mass decreases rapidly with
height
C – the pressure in a given area is constant
D – the environmental lapse rate is high, with little vertical
motion of air
currents
Ref: all
Ans: A
10095. What is the technical term for an increase in temperature
with altitude?
A – Subsidence
B – Inversion
C – Adiabatic
D – Advection
Ref: all
Ans: B
10111. The dry adiabatic lapse rate has a value of:
A – 0.5oC/100m
B – 2oC/1000 ft
C – 0.65oC/100m
D – 1oC/100m
Ref: all
Ans: D
10122. How would you characterise an air temperature of 15oC
at the 700 hPa level
over western Europe?
A – Within +/-5oC of ISA
B – High
C – Low
D – 20oC below standard
Ref: all
Ans: C
10128. In an air mass with no clouds the surface temperature is
15oC and the
temperature at 1000m/AGL is 13oC. This layer of air is:
A – unstable
B – stable
C – a layer of heavy turbulence
D – conditionally unstable
Ref: all
Ans: B
10130. The rate of decrease of temperature with height per 100m
in the International
Standard Atmosphere is:
A – 0.65oC
B – 1oC
C – 0.5oC
D – variable
Ref: all
Ans: A
10145. The radiation of the sun heats:
A – the air in the troposphere only directly if no clouds are present
B – the air in the troposphere directly
C – the water vapour in the air of the troposphere
D – the surface of the earth, which heats the air in the
troposphere
Ref: all
Ans: D
10742. From which of the following pieces of information can the
stability of the
atmosphere be derived?
A – Surface temperature
B – Environmental lapse rate
C – Dry adiabatic lapse rate
D – Pressure at the surface
Ref: all
Ans: B
10754. What characteristic is associated with a temperature
inversion?
A – Stability
B – Instability
C – Clear ice
D – Area of active storms
Ref: all
Ans: A
10760. Convective activity over land in mid-latitudes is greatest
in:
A – winter in the afternoon
B – winter during the night and early morning
C – summer during the night and early morning
D – summer in the afternoon
Ref: all
Ans: D
10761. The dry adiabatic lapse rate:
A – has a constant fixed value
B – is greater in summer than in winter
C – is greater during the night than during the day
D – has a variable value
Ref: all
Ans: A
10802. The temperature at FL 160 is -22oC. What will the
temperature be at FL 90 if
the ICAO standard lapse rate is applied?
A – -4oC
B – -8oC
C – 0oC
D – +4oC
Ref: all
Ans: B
10812. The temperature at FL 140 is -12oC. What will the
temperature be at FL 110
if the ICAO standard lapse rate is applied:
A – -9oC
B – -18oC
C – -6oC
D – -15oC
Ref: all
Ans: C
10820. The temperature at FL 80 is +6oC. What will the
temperature be at FL 130 if
the ICAO standard lapse rate is applied?
A – +2oC
B – -6oC
C – 0oC
D – -4oC
Ref: all
Ans: D
10839. The diurnal variation in temperature is largest when the
sky is:
A – clear and winds are strong
B – clear and winds are weak
C – overcast and winds are weak
D – overcast and winds are strong
Ref: all
Ans: B
10861. On a clear sky, continental ground surface, wind calm, the
minimum
temperature is reached approximately:
A – at the moment the sun rises
B – half an hour before sunrise
C – half an hour after sunrise
D – one hour before sunrise
Ref: all
Ans: C
10862. The temperature at FL 110 is -5oC. What will the
temperature be at FL 50 if
the ICAO standard lapse rate is applied?
A – -3oC
B – +3oC
C – 0oC
D – +7oC
Ref: all
Ans: D
10877. The 0o isotherm is forecast to be at FL 50. At what FL
would you expect a
temperature of -6oC?
A – FL 110
B – FL 20
C – FL 100
D – FL 80
Ref: all
Ans: D
10879. A temperature of 15oC is recorded at an altitude of 500
metres above sea level.
If the vertical temperature gradient is that of a standard
atmosphere, what will
the temperature be at the summit of a mountain, 2500 metres
above sea level?
A – +4oC
B – +2oC
C – 0oC
D – -2oC
Ref: all
Ans: B
10887. The value of the saturated adiabatic lapse rate is closest
to that of the dry
adiabatic lapse rate in:
A – cumulus
B – freezing fog
C – stratus
D – cirrus
Ref: all
Ans: D
10894. Around Paris on January 3rd at 1800 UTC, the surface
temperature under
shelter is 3oC. The sky is covered by 8 oktas of stratus. QNH is
1033 hPa. If
the sky is covered all night, the minimum temperature of the
night of January
3rd to January 4th should be:
A – slightly above +3oC
B – significantly below 0oC
C – slightly below +3oC
D – significantly above +3oC
Ref: all
Ans: C
15782. Which of the following is a common cause of ground or
surface temperature
inversion?
A – Terrestrial radiation on a clear night with no or very light
winds
B – Warm air being lifted rapidly aloft, in the vicinity of
mountainous terrain
C – The movement of colder air under warm air, or the movement
of warm air
over cold air
D – Heating of the air by subsidence
Ref: all
Ans: A
15810. How does temperature vary with increasing altitude in the
ICAO standard
atmosphere below the tropopause?
A – increases
B – At first it increases and higher up it decreases
C – Remains constant
D – Decreases
Ref: all
Ans: D
15822. How would you characterise an air temperature of 30oC
at the 300 hPa level
over western Europe?
A – High
B – Within +/- 5oC of ISA
C – Low
D – Very low
Ref: all
Ans: A
15823. How would you characterise an air temperature of 55oC
at the 200 hPa level
over western Europe?
A – High
B – Low
C – Very high
D – Within +/- 5oC of ISA
Ref: all
Ans: D
15851. An inversion is a layer of air in which the temperature:
A – increases with height more than 1oC/100m,
B – decreases with height more than 1oC/100m
C – increases with height
D – remains constant with height
Ref: all
Ans: C
15858. A wide body takes off on a clear night in Dhahran, Saudi
Arabia. Shortly after
take off the aircraft’s rate of climb drops to zero. This can be due
to:
A – low relative humidity
B – a very strong temperature inversion
C – sand/dust in the engines
D – very pronounced downdrafts
Ref: all
Ans: B
15876. In still air the temperature decreases at an average of
1.2oC per 100m increase
in altitude. This temperature change is called:
A – environmental lapse rate
B – saturated adiabatic lapse rate
C – dry adiabatic lapse rate
D – normal lapse rate
Ref: all
Ans: A
16340. In the disturbed temperate regions:
A – winters are generally mild
B – the weather is mainly governed by travelling frontal
depressions
C – the wet season is normally from May to September
D – the surface winds are moderate westerlies
Ref: all
Ans: B
16348. Horizontal differences in the mean temperature of a layer
are caused by:
A – insulation
B – advection
C – differential heating of the earth’s surface
D – change of air mass
Ref: all
Ans: C
16351. Which of the following statements concerning the thermal
wind component
(TWC) is true?
A – TWC decreases as the horizontal mean temperature gradient
increases
B – TWC increases as the horizontal mean temperature gradient
increases
C – the greater the TWC, the greater the reduction in the upper
wind
D – the greater the TWC, the greater the surface wind
Ref: all
Ans: B
16555. Which one of the following describes normal conditions?
A – Temperature decreases with height in the troposphere
B – Temperature increases with height in the troposphere
C – Temperature decreases with height in the stratosphere
D – Temperature decreases at a similar rate in the troposphere as
in the
stratosphere
Ref: all
Ans: A
16556. For international aviation meteorological purposes,
temperature is measured in
degrees:
A – Fahrenheit
B – Celsius
C – Absolute
D – Kelvin
Ref: all
Ans: B
16571. If the depth of the troposphere increases, the temperature
at the tropopause
must:
A – decrease
B – stay the same
C – increase
D – impossible to say
Ref: all
Ans: A
16594. Air at T = +16oC and DP = +4oC is forced from sea level
over a 10,000 ft
mountain range and descends back to sea level on the other side.
If the
leeward condensation level is observed to be 8,000 ft what will be
the final
temperature?
A – 18oC
B – 20oC
C – 22oC
D – 24oC
Ref: all
Ans: C
24216. A parcel of unsaturated air is forced to rise through an
isothermal layer. So
long as it remains unsaturated, the temperature of the parcel:
A – decreases 0.65oC per 100m
B – remains constant
C – decreases 1oC per 100m
D – becomes equal to the temperature of the isothermal layer
Ref: all
Ans: C
24221. Absolute instability in the atmosphere will occur when the
environmental
lapse rate is
A – greater than both saturated adiabatic lapse rate and dry
adiabatic lapse rate
B – less than saturated adiabatic lapse rate
C – less than both saturated adiabatic lapse rate and dry
adiabatic lapse rate
D – greater than saturated adiabatic lapse rate but less than dry
adiabatic lapse
rate
Ref: all
Ans: A
24222. According to ISA the temperature in the lower part of the
stratosphere:
A – decreases with altitude
B – is almost constant
C – increases with altitude
D – increases at first and decreases afterward
Ref: all
Ans: B
24269. For both saturated and unsaturated air instability will
occur when the
A – environmental lapse rate is greater than both dry adiabatic
lapse rate and
saturated adiabatic lapse rate
B – environmental lapse rate is greater than saturated adiabatic
lapse rate but
less than dry adiabatic lapse rate
C – environmental lapse rate is less than both dry adiabatic lapse
rate and
saturated adiabatic lapse rate
D – dry adiabatic lapse rate is less than saturated adiabatic lapse
rate but
greater than environmental lapse rate
Ref: all
Ans: A
24291. In the lower levels of the atmosphere when the
environmental lapse rate is
greater than saturated adiabatic lapse rate but les than dry
adiabatic lapse rate
– the air mass is described as being
A – conditionally unstable
B – stable
C – unstable
D – absolutely unstable
Ref: all
Ans: A
24353. The temperature lapse rate of the standard atmosphere in
the troposphere is:
A – 2.5oC/1000 ft
B – 3oC/1000 ft
C – 6.5oC/1000 ft
D – 2oC/1000 ft
Ref: all
Ans: D
24386. What is, approximately, the temperature at 20000 ft in
the ICAO Standard
Atmosphere?
A – -20oC
B – -15oC
C – -25oC
D – -30oC
Ref: all
Ans: C
050-01-03 Atmospheric pressure
10035. What positions are connected by isobars on the surface
weather chart?
A – Positions with the same air pressure at a given level
B – Positions with the same temperature at a given level
C – Positions with the same wind velocity at a given level
D – Positions with the same relative pressure heights
Ref: all
Ans: A
10059. In the troposphere the decrease of pressure per 100m
increase in height:
A – is greater at higher levels than at lower levels
B – remains constant at all levels
C – is smaller at higher levels than at lower levels
D – is in the order of 27 hPa near MSL
Ref: all
Ans: C
10085. An isohypse (contour):
A – indicates the altitude of the zero degree isotherm
B – is the longest slope line of a frontal surface
C – is the limit between two air masses of different temperature
D – indicates the true altitude of a pressure level
Ref: all
Ans: D
10137. The station pressure used in surface weather charts is:
A – QNE
B – QFE
C – QNH
D – QFF
Ref: all
Ans: D
10807. Which of the following is true concerning atmospheric
pressure?
A – It is higher in winter than in summer
B – It decreases with height
C – It is higher at night than during the day
D – It always decreases with height at a rate of 1 hPa per 8m
Ref: all
Ans: B
10822. Isobars on a surface chart are lines of equal:
A – QFE
B – QFF
C – QNE
D – QNH
Ref: all
Ans: B
15780. What is approximate vertical interval which is equal to a
pressure change of 1
hPa at an altitude of 5,500m?
A – 15m (50 ft)
B – 8m (27 ft)
C – 32m (105 ft)
D – 64m (210 ft)
Ref: all
Ans: A
15809. The isobars drawn on a surface weather chart represent
lines of equal pressure:
A – at height of observatory
B – at a determined density altitude
C – reduced to sea level
D – at flight level
Ref: all
Ans: C
15837. Between which latitudes are you most likely to find the
region of travelling
low pressure systems?
A – 25o – 35o
B – 10o – 15o
C – 55o – 75o
D – 35o – 55o
Ref: all
Ans: C
15877. Assume that an aircraft is flying in the northern
hemisphere at the 500 hPa
pressure surface on a heading of 270 degrees. Which of the
following
statements is correct?
A – If in this pressure surface the wind comes from the direction
360 degrees,
then true altitude is increasing
B – If in this pressure surface the wind comes from the direction
180 degrees,
then true altitude is increasing
C – If in this pressure surface the wind comes from the direction
20 degrees,
then true altitude is increasing
D – If in this pressure surface the wind comes from the direction
090 degrees,
then true altitude is increasing
Ref: all
Ans: A
16349. At altitude, the atmospheric pressure in a column of warm
air is likely to be:
A – lower than at the same height in a column of cold air
B – higher than at the same height in a column of cold air
C – the same irrespective of the temperature
D – depends on the relative humidity
Ref: all
Ans: B
16357. Which of the following statements is true?
A – High contour values are equivalent to high pressure
B – Low contour values are equivalent to high pressures
C – High contour values are equivalent to low pressure
D – There is no direct relationship between contour values and
pressure
Ref: all
Ans: A
16358. When flying towards high contour values an aircraft will
experience:
A – headwind
B – tailwind
C – port drift
D – starboard drift
Ref: all
Ans: C
16363. Contour heights are:
A – true heights AGL
B – true heights AMSL
C – indicated heights above 1013.25 mb
D – do not indicate heights at all
Ref: all
Ans: B
16364. When flying from high to low contour values, which of the
following is
incorrect?
A – the true height of the aircraft will be falling
B – the pressure altimeter will indicate a constant value
C – the indicated height of the aircraft will be constant
D – the indicated height of the aircraft will only be true if 1013.25
mb is set
Ref: all
Ans: D
16436. You are making a long distance flight and have chosen a
suitable cruising
altitude for the whole flight. Towards the end of your flight, you
have
descended. What may be the reason for this?
A – you are approaching a region of high pressure
B – you are approaching a region of low pressure
C – standard pressure has dropped
D – temperature has increased
Ref: all
Ans: B
16438. Select the correct statement regarding the wind direction
in connection with
the high and low pressure systems in the Northern Hemisphere:
A – the winds blow counter clockwise around a high and clockwise
in a low
B – the winds blow clockwise in both highs and lows
C – the winds blow clockwise in a high and counter clockwise in a
low
D – the winds blow counter clockwise in both highs and lows
Ref: all
Ans: C
16439. If you fly across the isobars towards a region of high
pressure in the Northern
Hemisphere you will:
A – drift to the right
B – drift to the left
C – experience no drift but experience a headwind
D – experience no drift but experience a tailwind
Ref: all
Ans: B
16511. According to definition, flight levels are surfaces with
constant air pressure
determined from a certain pressure value. Which is this value?
A – 1013.25 hPa
B – 1025.13 hPa
C – Actual QFE
D – Actual QNH
Ref: all
Ans: A
16517. If you have a column of air limited by two isobaric
surfaces at a pressure
difference of 100 hPa, the distance between the pressure
surfaces will change
if mean temperature and mean pressure of the column of air
change. In which
of the following alternatives will the change of temperature and
pressure
interact to shorten the distance as much as possible?
A – The temperature increases and pressure increases
B – The temperature decreases and pressure increases
C – The temperature increases and pressure decreases
D – The temperature decreases and pressure decreases
Ref: all
Ans: B
16534. Lines joining points of equal pressure are known as:
A – Isotherms
B – Isopleths
C – Isobars
D – Isotachs
Ref: all
Ans: C
16544. A pressure difference of 10 hPa close to the ground
corresponds to a height
difference of:
A – about 50m
B – about 150m
C – about 300ft
D – about 30ft
Ref: all
Ans: C
16587. A rising parcel of air which has no heat entering or leaving
it, will:
A – reduce in pressure, rise in temperature, decrease in density
B – maintain volume, decrease in density, reduce in pressure
C – maintain pressure, reduce in density, increase in volume
D – reduce in pressure, decrease in density, increase in volume
Ref: all
Ans: D
24345. The QFF at an airfield located 400 metres above sea level
is 1016 hPa. The
air temperature is 10oC higher than a standard atmosphere.
What is the QNH?
A – 1016 hPa
B – More than 1016 hPa
C – Less than 1016 hPa
D – It is not possible to give a definitive answer
Ref: all
Ans: B
24431. Which of the following statements is correct?
A – Cumulus clouds and a good viability are normally observed in
a warm
sector in winter
B – Cumulus clouds and a good visibility are normally observed in
a warm
sector in autumn
C – Normally atmospheric pressure stops falling rapidly behind a
warm front,
the air temperature rises
D – At warm fronts thunderstorms are often observed
Ref: all
Ans: C
050-01-04 Atmospheric density
10146. Under what condition does pressure altitude have the
same value as density
altitude?
A – When the altimeter has no position error
B – At sea level when the temperature is 0oC
C – At standard temperature
D – When the altimeter setting is 1013.2 hPa
Ref: all
Ans: C
15779. At FL 180, the air temperature is -35oC. The air density at
this level is:
A – unable to be determined without knowing the QNH
B – greater than the density of the ISA atmosphere at FL 180
C – less than the density of the ISA atmosphere at FL 180
D – equal to the density of the ISA atmosphere at FL 180
Ref: all
Ans: B
16525. What happens if density altitude is 3000 ft at an airport
whose elevation is
1000 ft?
A – Take off and landing performance will be unaffected
B – The altimeter will indicate 3000 ft when the aircraft is on the
ground
C – Take off and landing performance will be about the same as
for an airport
with an elevation of 3000 ft
D – Indicated speed at 50 kt on take off and landing will be higher
than in a
standard atmosphere
Ref: all
Ans: C
24454. With all other quantities being constant, the density of the
atmosphere
increases with increasing:
A – relative humidity
B – air pressure
C – stability
D – temperature
Ref: all
Ans: B
050-01-05 International Standard Atmosphere (ISA)
8840. The lowest assumed temperature in the International
Standard Atmosphere
(ISA) is:
A – -44.7oC
B – -273oC
C – -58.5oC
D – -100oC
Ref: all
Ans: C
8850. A 500 hPa pressure level can vary in height. In temperate
regions which of the
following average heights is applicable?
A – FL 180
B – FL 160
C – FL 100
D – FL 390
Ref: all
Ans: A
8869. A 700 hPa pressure level can vary in height. In temperate
regions which of the
following average heights is applicable?
A – FL 100
B – FL 180
C – FL 300
D – FL 390
Ref: all
Ans: A
8882. The temperature at 10000 ft in the International Standard
Atmosphere is:
A – -20oC
B – 0oC
C – -5oC
D – -35oC
Ref: all
Ans: C
8884. If you are flying at FL 120 and the outside temperature is
-2oC, at what altitude
will the freezing level be?
A – FL 110
B – FL 130
C – FL 150
D – FL 90
Ref: all
Ans: A
10073. A 850 hPa pressure level can vary in height. In temperate
regions which of
the following average heights is applicable?
A – FL 300
B – FL 100
C – FL 50
D – FL 390
Ref: all
Ans: C
10120. If you are flying at FL 300 in an air mass that is 15oC
warmer than a standard
atmosphere, what is the outside temperature likely to be?
A – -30oC
B – -45oC
C – -60oC
D – -15oC
Ref: all
Ans: A
10125. In the International Standard Atmosphere the decrease in
temperature with
height below 11 km is:
A – 1oC per 100m
B – 0.65oC per 100m
C – 0.5oC per 100m
D – 0.6oC per 100m
Ref: all
Ans: B
10127. What is the vertical temperature lapse rate, up to 11 km,
in the standard ICAO
atmosphere?
A – 2oC per 1000m
B – 4.5oC per 1000m
C – 3oC per 1000m
D – 6.5oC per 1000m
Ref: all
Ans: D
10136. A 200 hPa pressure altitude level can vary in height. In
temperate regions
which of the following average heights is applicable?
A – FL 50
B – FL 300
C – FL 100
D – FL 390
Ref: all
Ans: D
10736. A 300 hPa pressure level can vary in height. In temperate
regions which of
the following average heights is applicable?
A – FL 100
B – FL 390
C – FL 300
D – FL 50
Ref: all
Ans: C
19763. If you are flying at FL 100 in an air mass that is 10oC
warmer than a standard
atmosphere, what is the outside temperature likely to be?
A – +15oC
B – +5oC
C – -10oC
D – -15oC
Ref: all
Ans: B