Meteorology - Atmosphere Quizlet

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A 200 hPa pressure altitude level can vary in height. In moderate regions which of the following avarage heights is applicable?

* FL 50
* FL 300
* FL 390
* FL 100

FL 390

What is the approximate vertical interval which is equal to a pressure change of 1 hPa at an altitude of 5500m?

* 64 m (210 FT)
* 8 m (27 FT)
* 32 m (105 FT)
* 15 m (50FT)

15 m (50 FT)

In order to calculate QFE from QNH, which of the following must be known?

* Elevation of the airfield.
* Temperature at the airfield.
* Elevation at the airfield and temperature at MSL.
* Elevation and temperature at the airfield.

Elevation of the airfield.

Several physical processes contribute to athmospheric warming. Which of the following contribute the most?

* Absorption and evaporation.
* Solar radiation and conduction.
* Convection and condensation.
* Absorption and evaporization.

convection and condensation.

A layer is conditionally unstable if the air

* is unstable for saturated air as well as for dry air.
* is unstable for saturated air and stable for dry air.
* becomes stable by lifting it.
* is stable for saturated air and unstable for dry air.

is unstable for saturated air and stable for dry air.

The temperature at FL 140 is -12' C. What will be the temperature at FL 110 if the ICAO standard lapse rate is applied?

* -9' C.
* -18' C.
* -6' C.
* -15' C.

-6' C.

If atmospheric conditions exist such that the temperature deviation is ISA +10'C in the lower troposphere up to 18'000 FT, what is the actual layer thickness between FL 60 and FL 120?

* 5760 FT.
* 6000 FT.
* 5900 FT.
* 6240 FT.

6'240 FT.

Which of the following is a common of ground or surface inversion?

* Heating of the air by subsidence.
* Warm air being lifted rapidly aloft, in the vicinity of mountainous terrain.
* The movement of colder air under warm air, or the movement of warm air over cold air.
* Terrestrial radiation on a clear night with no or very light winds.

Terrestrial radiation on a clear night with no or very light winds.

At a certain position, the temperature at the 300 hPa chart is -48'C; according to the tropopause chart, the tropopause is at FL 330. What is the most likely temperature at FL 350?

* -56,5°C.
* -50°C.
* -54°C.
* -58°C.

- 54°C.

After landing at an aerodrome (aerodrome elevation 1715 FT), the altimeter indicates an altitude of 1310 FT. The altimeter is set to pressure value of 1013 hPa. What is the QNH at this aerodrome?

* 1028 hPa.
* 1015 hPa.
* 1013 hPa.
* 998 hPa.

1028 hPa.

You intend to overfly a mountain range. The recommended minimum flight altitude is, according to the aviation chart, 15000 FT/AMSL. The air mass that you will be flying through is on avarage 15°C warmer than the standard atmosphere. The altimeter is set to QNH (1023 hPa). At what altimeter reading will you effectively be at the recommended minimum flight altitude?

* 15900 FT.
* 13830 FT.
* 14100 FT.
*14370 FT.

14100 FT.

You are flying at FL 130, and your true altitude is 12000 FT. What is the temperature deviation from that of the standard atmosphere at FL 130 (QNH 1013,2 hPa)?

* ISA +12°C.
* ISA +/- 0°C.
* ISA +20°C.
* ISA -20°C.

ISA -20°C.

What is the boundary layer between troposphere and stratosphere called?

* Ionosphere.
* Tropopause.
* Stratosphere.
* Atmosphere.

Tropopause.

An outside air temperature of -35°C is measured while cruising at FL 200. What is the temperature deviation from the ISA at this level?

* 5°C colder than ISA.
* 10°C colder than ISA.
* 5°C warmer than ISA.
* 10°C warmer than ISA.

10°C colder than ISA.

(2°C pro 1000 FT)

Convective activity over land in mid-latitudes is greatest in

* winter in the afternoon.
* summer in the afternoon.
* summer during the night and early morning.
* winter during the night and early morning.

summer in the afternoon.

Absolute instability is said to exist whenever the environmental lapse rate

* exceeds the saturated adiabatic lapse rate.
* is between the dry and saturated adiabatic lapse rate.
* is less than the saturated adiabatic lapse rate.
* exceeds the dry adiabatic lapse rate.

exceeds the dry adiabatic lapse rate.

(add picture)

Which of the following is a commom result of subsidence?

* Clear air turbulence at higher altitudes.
* CB-clouds and thunderstorms over a large area.
* Wide spread NS and AS clouds and intense precipitation.
* An inversion over a large area with haze, mist.

An inversion over a large area with haze, mist.

(Subsidence inversion: In an area of high pressure the air will sink with a speed of a few cm/sec (subsidence) and is warmed through compression. The layers of air near the surface flow outwards away from the high pressure area. An inversion is produced at an altitude of 2000 - 6000ft.

What is the most likely temperature at the tropical tropopause?

* -75°C
* -55°C
* -35°C
* -25°C

-75°C.

Which weather condition lowers true altitude as compared to pressure altitude to a position where flight over mountains could be dangerous?

* Cold high.
* Warm depression.
* Cold low.
* Warm high.

Cold low.

(Cold low = cold depression. The air in the centre of a low pressure area is colder than that in the immediate surroundings. In the centre of the low the vertical seperation of pressure surfaces is smaller than in the immediately surrounding air.)

The 0° isotherm is forecast to be at FL 50. At what FL would expect a temperature of -6°C?

* FL 110
* FL 80
* FL 100
* FL 20

FL 80.

(2°C per 1000ft.)

What positions are connected by isobars on the surface weather chart?
* Positions with the same temperature at a given level.
* Positions with the same air pressure at a given level.
* Positions with the same wind velocity at a given level.
* Positions with the same relative pressure heights.

Positions with the same air pressure at a given level.

A vertical spacing of 1000 FT, is the standard seperation between two FL. Under conditions of cold air advection (ISA -15°C), what would the true vertical seperation be?

* Less than 1000 FT.
* It remains 1000 FT.
* More than 1000 FT.
* Without QNH information, it can not be determined.

Less than 1000 FT.

(Cold air is more dense)

At which temperature and pressure conditions may you safely assume that the minimum usable flight level at least lies at the same height, as the minimum safe altitude?

* In a cold low pressure region.
* In a warm high pressure region.
* At a temperature less than or equal to that of the ISA and where the QNH is less than 1013 hPa.
* At a temperature greater than or equal to the ISA and where the QNH is greater than or equal to 1013 hPa.

At a temperature greater than or equal to the ISA and where the QNH is greater than or equal to 1013 hPa.

The QNH of an airport at sea level is 983 hPa and the temperature deviation from ISA is -15°C below FL 100. What is the true altitude of FL 100?

* 9790 FT.
* 10210 FT.
* 11410 FT.
* 8590 FT.

8590 ft.

(QNH 983, i.e. 30 hPa lower than standard, assume 1 hPa/27 ft - 810 ft
Temperature 15 degrees C lower than ISA, assume 4 % per 10 degrees deviation from ISA -600 ft
True altitude 8'590 ft
to calculate: QNH lower than 1013 and/or temperature lower than ISA, subtract, QNH higher than 1013 and/or temperature higher than ISA, add!

What information is required to calculate a lowest usable flight level from a given minimum safe altitude?

* Lowest value of QNH and the highest negative temperature deviation from ISA.
* Highest value of QNH and the highest negative temperature deviation from ISA.
* Highest value of QNH and the highest negative temperature deviation from ISA.
* Lowest value of QNH and the lowest negative temperature deviation from ISA.

Lowest value of QNH and the highest negative temperature deviation from ISA.

What is the relationship, if any, between QFE and QNH at an airport situated 50 FT below sea level?

* QFE is greater than QNH.
* QFE is smaller than QNH.
* QFE equals QNH.
* No clear relationship exists.

QFE is greater than QNH.

You plan a flight over a mountain range at a true altitude of 15000FT/AMSL. The air is on avarage 15°C colder than ISA, the pressure at sea level is 1003 hPa. What indication must the altimeter (setting 1013,2 hPa) read?

* 15690 FT.
* 16170 FT.
* 14370 FT.
* 13830 FT.

16170 FT.

During a flight at FL 100 from Marseille (QNH 1012 hPa) to Palma de Mallorca (QNH 1015 hPa), an aircraft remains at a constant true altitude. The reason for this is that:

* The air at Marseille is colder than that at Palma de Mallorca.
* The altimeters are erroneous, and need to be tested.
* One of the two QNH values may be incorrect.
* The air at Marseille is warmer than that at Palma de Mallorca.

The air at Marseille is warmer than that at Palma de Mallorca.

An aircraft lands at an airport (airport elevation 1240 FT, QNH 1008 hPa). The altimeter is to 1013 hPa. the altimeter will indicate:

* 1200 FT.
* 1280 FT.
* 1105 FT.
* 1375 FT.

1375 FT.

In an airmass with no clouds the surface temperature is 15°C and 13°C at 1000m. This layer of air is:

* stable.
* unstable.
* a layer of heavy turbulence.
* conditionally unstable.

stable.

Half the mass of the atmosphere is found in the first

* 11 km
* 3 km
* 5 km
* 8 km

5 km.

The thickness of the troposphere varies with

* latitude
* longitude
* rotation of the earth
* the wind

latitude.

In the lower part of the stratosphere the temperature

* decreases with altitude
* increases with altitude
* is almost constant
* increases at first and afterwards decreases

is almost constant.

What characteristic is associated with temperature inversion?

* Stability
* Instability
* Clear ice
* Area of active storms

Stability.

What pressure is defined as QFE?

* The pressure at field elevation.
* The pressure of the altimeter.
* The presssure reduced to sea level using actual temperatures.
* The pressure reduced to sea level using ISA temperatures.

The pressure at field elevation.

The isobars drawn on a surface weather chart represent lines of equal pressure

* at a determined density altitude
* at flight level
* reduced to sea level
* at height of observatory

reduced to sea level.

What is the approximate composition of the dry air by volume in the troposphere?

* 21 % oxygen, 78 % nitrogen, and the rest other
gases
* 10 % oxygen, 89 % nitrogen, and the rest other gases
* 88 % oxygen, 9 % nitrogen, and the rest other gases
50 % oxygen, 40 % nitrogen, and the rest other gases

21 % oxygen, 78 % nitrogen, and the rest other gases

How does temperature vary with increasing altitude in the ICAO standard atmosphere below the tropopause?
a) At first it increases and higher up it decreases
b) Increases
c) Decreases
d) Remains constant

Decreases.

What is the vertical temperature lapse rate, up to 11 km, in the standard ICAO atmosphere ?
a) 2°C per 1000 m
b) 6.5°C per 1000 m
c) 3°C per 1000 m
d) 4.5°C per 1000 m

6.5°C per 1000 m

Which of the following conditions would cause the altimeter to indicate a lower altitude than that actually flown ?
a) Pressure altitude the same as indicated altitude.
b) Atmospheric pressure lower than standard
c) Air temperature higher than standard
d) Air temperature lower than standard.

Air temperature higher than standard

Which layer of the atmosphere contains more than 90 per cent of all water vapour?
a) Lower stratosphere
b) Troposphere
c) Upper stratosphere
d) Ionosphere

Troposphere

The temperature at FL 160 is -22°C. What will the temperature be at FL 90 if the ICAO standard lapse rate is applied ?
a) -4°C
b) +4°C
c) 0°C
d) -8°C

-8°C

A temperature of +15°C 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) +4°C
b) +2°C
c) 0°C
d) -2°C

+2°C

How would you characterise an air temperature of
-15°C at the 700 hPa level over western Europe?
a) Low
b) High
c) Within +/-5°C of ISA
d) 20°C below standard

Low

An air temperature of -30°C at the 300 hPa level over central Europe in summer is
a) Very low
b) Within +/-5°C of ISA
c) Low
d) High

High

How would you characterise an air temperature of
-55°C at the 200 hPa level over western Europe?
a) High
b) Within +/-5°C of ISA
c) Low
d) Very high

Within +/-5°C of ISA

What is the technical term for an increase in temperature with altitude?
a) Inversion
b) Subsidence
c) Adiabatic
d) Advection

Inversion

The station pressure used in surface weather charts is
a) QNE
b) QFE
c) QFF
d) QNH

QFF

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 300
c) FL 390
d) FL 50

FL 300

A 700 hPa pressure level can vary in height. In temperate regions which of the following average heights is applicable ?
a) FL 300
b) FL 180
c) FL 100
d) FL 390

FL 100

A 850 hPa pressure level can vary in height. In temperate regions which of the following average heights is applicable ?
a) FL 300
b) FL100
c) FL 390
d) FL 50

FL 50

The QFF at an airfield located 400 metres above sea level is 1016 hPa. The air temperature is 10°C higher than a standard atmosphere. What is the QNH?
a) Less than 1016 hPa
b) More than 1016 hPa
c) 1016 hPa
d) It is not possible to give a definitive answer

More than 1016 hPa

The QFF at an airfield located 400 metres above sea level is 1016 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QNH?
a) It is not possible to give a definitive answer
b) More than 1016 hPa
c) Less than 1016 hPa
d) 1016 hPa

Less than 1016 hPa

The QNH at an airfield located 200 metres above sea level is 1009 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QFF?
a) Less than 1009 hPa
b) More than 1009 hPa
c) 1009 hPa
d) It is not possible to give a definitive answer

More than 1009 hPa

The QNH at an airfield located 200 metres above sea level is 1022 hPa. The air temperature is not available. What is the QFF?
a) Less than 1022 hPa
b) More than 1022 hPa
c) It is not possible to give a definitive answer
d) 1022 hPa

It is not possible to give a definitive answer

The QNH at an airfield located 0 metres above sea level is 1022 hPa. The air temperature is not available. What is the QFF?
a) It is not possible to give a definitive answer
b) Less than 1022 hPa
c) 1022 hPa
d) More than 1022 hPa

1022 hPa

The QNH at an airfield in California located 69 metres below sea level is 1018 hPa. The air temperature is 10°C higher than a standard atmosphere. What is the QFF?
a) More than 1018 hPa
b) Less than 1018 hPa
c) 1018 hPa
d) It is not possible to give a definitive answer

More than 1018 hPa

The QFF at an airfield in California located 69 metres below sea level is 1030 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QNH?
a) It is not possible to give a definitive answer
b) More than 1030 hPa
c) 1030 hPa
d) Less than 1030 hPa

More than 1030 hPa

? (page 31)

If the QFE at Locarno (200 metres above sea level) is 980 hPa, what is the approximate QNH ?
a) 1015 hPa
b) 1000 hPa
c) 1005 hPa
d) 1010 hPa

1005 hPa

If the QFE at Locarno (200 metres above sea level) is 1000 hPa, what is the approximate QNH?
a) 1025 hPa
b) 985 hPa
c) 990 hPa
d) 1035 hPa

1025 hPa

If the QNH at Locarno (200 metres above sea level) is 1015 hPa, what is the approximate QFE?
(Assume 1hPa = 8m)
a) 1005 hPa
b) 995 hPa
c) 990 hPa
d) 1000 hPa

990 hPa

If the QNH at Locarno (200 metres above sea level) is 1025 hPa, what is the approximate QFE?
a) 1000 hPa
b) 995 hPa
c) 1005 hPa
d) 1025 hPa

1000 hPa

If you are flying at FL 300 in an air mass that is 15°C warmer than a standard atmosphere, what is the outside temperature likely to be?
a) -30°C
b) -45°C
c) -60°C
d) -15°C

-30°C

If you are flying at FL 120 and the outside temperature is -2°C, at what altitude will the "freezing level" be?
a) FL 110
b) FL 130
c) FL 150
d) FL 90

FL 110

An aircraft flying at FL 100 from Marseille (QNH 1012 hPa) to Palma de Mallorca (QNH 1006 hPa) experiences no change to true altitude. The reason for this is that :
a) the air at Palma de Mallorca is warmer than that at Marseille
b) the air at Palma de Mallorca is colder than that at Marseille
c) the altimeters are erroneous, and need to be tested
d) one of the two QNH values may be incorrect

the air at Palma de Mallorca is warmer than that at Marseille

During a flight over the sea at FL 100 from Marseille (QNH 1012 hPa) to Palma de Mallorca (QNH 1012 hPa), the true altitude is constantly increasing. What action, if any, should be taken ?
a) None, the reason for the change is that the air around Palma is warmer than the air around Marseille
b) Have your altimeter checked, because its readings are obviously wrong
c) Recheck the QNH because one of the QNH values must be wrong
d) Compensate by heading further to the left

None, the reason for the change is that the air around Palma is warmer than the air around Marseille

During a flight over the sea at FL 100 from Marseille (QNH 1016 hPa) to Palma de Mallorca (QNH 1016 hPa), the true altitude is constantly decreasing. What is the probable reason for this ?
a) The air at Marseille is warmer than that at Palma de Mallorca
b) One of the QNH values must be wrong
c) The altimeter is faulty
d) The aircraft is being blown off track to the left

The air at Marseille is warmer than that at Palma de Mallorca

During a flight over the sea at FL 135, the true altitude is 13500 feet; local QNH is 1019 hPa. What information, if any, can be gained about the air mass in which the aircraft is flying?
a) It is colder than ISA
b) Its average temperature is the same as ISA
c) It is warmer than ISA
d) There is insufficient information to make any assumption

It is colder than ISA

An aircraft is flying over the sea at FL 90; the true altitude is 9100 feet; local QNH is unknown. What assumption, if any, can be made about the air mass in which the aircraft is flying ?
a) It is colder than ISA
b) It is warmer than ISA
c) There is insufficient information to make any assumption
d) Its average temperature is the same as ISA

There is insufficient information to make any assumption

An aircraft is flying over the sea at FL 120, with a true altitude of 12000 feet; local QNH is 1013 hPa. What assumption, if any, can be made about the air mass in which the aircraft is flying ?
a) It is warmer than ISA
b) It is colder than ISA
c) Its average temperature is the same as ISA
d) There is insufficient information to come to any conclusion

Its average temperature is the same as ISA

An aircraft is flying over the sea at FL 100, with a true altitude of 10000 feet; local QNH is 1003 hPa.
What assumption, if any, can be made about the air mass in which the aircraft is flying ?
a) There is insufficient information to come to any conclusion
b) It is warmer than ISA
c) It is colder than ISA
d) Its average temperature is about ISA

It is warmer than ISA

An aircraft is flying through the Alps on a very cold winter's day. The regional QNH is 1013 hPa. During the flight, you circle around a mountain at an altitude of its summit. What reading will the aneroid altimeter give, compared to the elevation of the summit?
a) The same altitude as the elevation of the summit
b) A higher altitude than the elevation of the summit
c) A lower altitude than the elevation of the summit
d) There is insufficient information to come to a conclusion

A higher altitude than the elevation of the summit

An aircraft is flying through the Alps on a warm summer's day. The weather is fine, and there is a high pressure system in the area. During the flight, a mountain is passed at an altitude of its summit. What reading will the aneroid altimeter give, compared to the summit's elevation?
a) There is insufficient information to come to a conclusion
b) A higher altitude than the elevation of the summit
c) A lower altitude than the elevation of the summit
d) The same altitude as the elevation of the summit

A lower altitude than the elevation of the summit

An aircraft is descending to land under IFR. If the local QNH is 1009 hPa, what will happen to the altitude reading when the altimeter is reset at the transition level ?
a) It will increase
b) It will remain the same
c) It will decrease
d) It will not be affected

It will decrease

During the climb after takeoff, the altimeter setting is adjusted at the transition altitude. If the local QNH is 966 hPa, what will happen to the altimeter reading during the resetting procedure?
a) It will increase
b) It will decrease
c) It will remain the same
d) It is not possible to give a definitive answer

It will increase

An aircraft is flying from Point A to Point B at the flight level corresponding to the pressure surface of the constant pressure chart. Which of the following statements is correct?
a) The true altitude will be higher over B than over A
b) The true altitude will be higher over A than over B
c) Wind speed over A is higher than over B
d) Wind speed over Paris is higher than over B

(Isobars at B closer together)

The true altitude will be higher over A than over B

An aircraft is flying from Point A to Point B on the upper level contour chart. The altimeter setting is 1013,2 hPa. Which of these statements is correct?
a) Wind speed at A and at B is the same
b) The true altitude will be higher at B than at A
c) The true altitude will be higher at A than at B
d) Wind speed at A is higher than at B

(Isobars at B closer together)

The true altitude will be higher at A than at B

An aircraft is flying from Point A to Point B at the flight level corresponding to the pressure surface of the constant pressure chart. Which of the following statements is correct?
a) Wind speed over B is higher than over A
b) The true altitude will be higher over A than over B
c) Wind speed over Madrid is higher than over A
d) The true altitude will be higher over B than over A

(Isobars at A closer together)

The true altitude will be higher over B than over A

An aircraft is flying from Point A to Point B at the flight level corresponding to the pressure surface of the constant pressure chart. Which of the following statements is correct?
a) The true altitude will be higher over A than over B
b) Wind speed over B is higher than over A
c) Wind speed over A and over B is the same
d) The true altitude will be higher over B than over A

(Isobars at A closer togeter)

The true altitude will be higher over B than over A

You are flying at FL 200. Outside air temperature is -40°C, and the pressure at sea level is 1033 hPa. What is the true altitude?
a) 19340 feet
b) 20660 feet
c) 21740 feet
d) 18260 feet

19340 feet

You are flying at FL 160. Outside air temperature is -27°C, and the pressure at sea level is 1003 hPa. What is the true altitude?
a) 15630 feet
b) 16370 feet
c) 15090 feet
d) 16910 feet

15090 feet

You are planning to fly across a mountain range. The chart recommends a minimum altitude of 12000 feet above mean sea level. The air mass you will be flying through is an average 10°C warmer than ISA. Your altimeter is set to 1023 hPa (QNH of a nearby airport at nearly sea level). What altitude will the altimeter show when you have reached the recommended minimum altitude?
a) 11520 feet
b) 12210 feet
c) 11250 feet
d) 11790 feet

11520 feet

An aircraft lands at an airport (airport elevation 540 FT, QNH 993 hPa) with the altimeter set to 1013 hPa. What will it indicate ?
a) 1080 FT
b) 700 FT
c) 380 FT
d) 0 FT

1080 FT

After landing at an aerodrome (QNH 993 hPa) it is noticed that the altimeter is still set to 1013,2 hPa and that it reads 1200 feet. What is the elevation of the aerodrome above mean sea level ?
a) 1200 feet.
b) 660 feet.
c) 1740 feet.
d) 2280 feet.

660 feet.

An altimeter adjusted to 1013 hPa indicates an altitude of 3600 FT. Should this altimeter be adjusted to the local QNH value of 991 hPa, the altitude indicated would be
a) 2922 FT.
b) 4194 FT.
c) 4278 FT.
d) 3006 FT.

3006 FT.

In Geneva, the local QNH is 994 hPa. The elevation of Geneva is 1411 FT. The QFE adjustment in Geneva is
a) 967 hPa.
b) 942 hPa.
c) 961 hPa.
d) 948 hPa.

942 hPa.

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) 8600 FT.
c) 8350 FT.
d) 8000 FT.

7650 FT.

The subscale of an altimeter is set to 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) 560 FT.
b) 11 FT.
c) -10 FT.
d) 20 FT.

20 FT.

Going from the equator to the north pole, the altitude of the tropopause
a) decreases and its temperature increases
b) increases and its temperature increases
c) increases and its temperature decreases
d) decreases and its temperature decreases

decreases and its temperature increases

The troposphere is the
a) part of the atmosphere above the stratosphere
b) boundary between the mesosphere and thermosphere
c) part of the atmosphere below the tropopause
d) boundary between the stratosphere and the mesosphere

part of the atmosphere below the tropopause

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

temperature ceases to fall with increasing height

The tropopause is lower
a) south of the equator than north of it
b) in summer than winter in moderate latitudes
c) over the equator than over the South Pole
d) over the North Pole than over the equator

over the North Pole than over the equator

The temperature at 10000 FT in the International Standard Atmosphere is :
a) -5°C
b) 0°C
c) -20°C
d) -35°C

-5°C

The rate of decrease of temperature with height per 100 m in the International Standard Atmosphere is :
a) 0.5°C
b) 1°C
c) 0.65°C
d) variable

0.65°C

The height and the temperature of the tropopause are respectively in the order of
a) 8 km and -40°C over the equator
b) 8 km and - 75°C over the poles
c) 16 km and -75°C over the equator
d) 16 km and -40°C over the poles

16 km and -75°C over the equator

An inversion is a layer of air in which the temperature
a) increases with height more than 1°C/100m
b) remains constant with height
c) decreases with height more than 1°C/100m
d) increases with height

increases with height

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

remains constant with height

A temperature inversion indicates a state of the atmosphere which is
a) absolutely stable
b) absolutely unstable
c) conditionally unstable
d) conditionally stable

absolutely stable

The environmental lapse rate in an actual atmosphere
a) has a fixed value of 2°C/1000 FT
b) varies with time
c) has a fixed value of 0.65°C/100m
d) has a fixed value of 1°C/100m

varies with time

The dry adiabatic lapse rate has a value of
a) 1°C/100m
b) 2°C/1000FT
c) 0.65°C/100m
d) 0.5°C/100m

1°C/100m

The dry adiabatic lapse rate
a) is greater in summer than in winter
b) has a constant fixed value
c) is greater during the night than during the day
d) has a variable value

has a constant fixed value

An air mass is called stable when
a) the temperature in a given air mass decreases rapidly with height
b) the vertical motion of rising air tends to become weaker and disappears
c) the pressure in a given area is constant
d) the environmental lapse rate is high, with little vertical motion of air currents

the vertical motion of rising air tends to become weaker and disappears

In the International 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

0.65°C per 100m

Which statement is correct regarding the International Standard Atmosphere ?
a) At MSL temperature is 15°C and pressure is 1013.25hPa
b) At MSL temperature is 15°C and the decrease in temperature with height is 1°C per 100m
c) At MSL temperature is 10°C and the decrease in temperature with height is 1°C per 100m
d) At MSL pressure is 1013.25 hPa and the decrease of temperature with height is 1°C per 100m

At MSL temperature is 15°C and pressure is 1013.25hPa

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

It decreases with height

QNH is defined as
a) QFE reduced to MSL using the values of the actual atmosphere
b) pressure at MSL in the standard atmosphere
c) pressure at MSL in the actual atmosphere
d) QFE reduced to MSL using the values of the standard atmosphere

QFE reduced to MSL using the values of the standard atmosphere

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

QNH can be equal to QFE

Which statement is true ?
a) QNH can be 1013.25 only for a station at MSL
b) QNH can not be 1013.25 hPa
c) QNH can be lower as well as higher than 1013.25 hPa
d) QNH is lower than 1013.25 hPa at any time

QNH can be lower as well as higher than 1013.25 hPa

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 International Standard Atmosphere
c) elevation while landing
d) zero while landing only if conditions are as in the International Standard Atmosphere

elevation while landing

Advection is :
a) the same as convection
b) horizontal motion of air
c) the same as subsidence
d) vertical motion of air

horizontal motion of air

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

the surface of the earth, which heats the air in the troposphere

The diurnal variation in temperature is largest when the sky is
a) clear and winds are strong
b) overcast and winds are weak
c) clear and winds are weak
d) overcast and winds are strong

clear and winds are weak

The following temperatures have been observed over a station at 1200 UTC. Assume the station is at MSL. Height in feet. Temperature in degrees C.
20000.-12 18000.-11 16000.-10 14000.-10 12000.-6 10000.-2 8000. +2 6000. +6 4000. +12 2000. +15 surface+15.
a) The layer between 16000 and 18000 FT is absolutely unstable
b) The height of the freezing level over the station is approximately 12000 FT.
c) Assuming that the MSL pressure is 1013.25 hPa the true altitude of an aircraft would actually be higher than the indicated altitude.
d) The temperature at 10000 FT is in agreement with the temperature in the International Standard Atmosphere.

Assuming that the MSL pressure is 1013.25 hPa the true altitude of an aircraft would actually be higher than the indicated altitude.

An inversion is
a) a decrease of pressure with height
b) an increase of pressure with height
c) an increase of temperature with height
d) a decrease of temperature with height

an increase of temperature with height

In still air the temperature decreases at an average of 1.2°C per 100 m 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

environmental lapse rate

A layer can be
a) unstable for unsaturated air and conditionally unstable
b) stable for unsaturated air and unstable for saturated air
c) unstable for unsaturated air and neutral for saturated air
d) stable for saturated air and unstable for unsaturated air

stable for unsaturated air and unstable for saturated air


A layer can be:

a) unstable for unsaturated air and conditionally unstable : if a layer is unstable for unsaturated air it is absolutely unstable, not conditionally unstable

b) stable for saturated air and unstable for unsaturated air: is definately wrong, it is vice-versa

c) unstable for unsaturated air and neutral for saturated air: is also wrong, refer to your Jepp book

d) stable for unsaturated air and unstable for saturated air: This is correct, because then the layer is conditionally unstable

all these definitions are easy to derive out of the Jepp book when you go to chapter "adiabatics and stability".

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

stability increases in the laye

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

nocturnal radiation

From which of the following pieces of information can the stability of the atmosphere be derived?
a) Surface temperature
b) Pressure at the surface
c) Dry adiabatic lapse rate
d) Environmental lapse rate

Environmental lapse rate

In order to reduce QFE to QNH, which of the following item(s) must be known ?
a) Elevation of the airfield and the temperature at the airfield
b) Temperature at the airfield
c) Elevation of the airfield and the temperature at MSL
d) Elevation of the airfield

Elevation of the airfield

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 180 degrees, then true altitude is increasing
b) If in this pressure surface the wind comes from the direction 360 degrees, then true altitude is increasing
c) If in this pressure surface the wind comes from the direction 270 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

If in this pressure surface the wind comes from the direction 360 degrees, then true altitude is increasing

An aircraft is flying at FL 180 on the northern hemisphere with a crosswind from the left. Which of the following is correct concerning its true altitude ?
a) It remains constant
b) It decreases
c) It increases
d) Without knowing temperatures at FL 180 this question can not be answered.

It decreases

The QNH is equal to the QFE if
a) T actual < T standard
b) T actual = T standard
c) the elevation = 0
d) T actual > T standard

the elevation = 0

Which of the following conditions gives the highest value of the QNH?
a) QFE = 1003 hPa, elevation = 1200 FT (366m)
b) QFE = 1000 hPa, elevation = 1200 FT (366m)
c) QFE = 995 hPa, elevation = 1200 FT (366m)
d) QFE = 995 hPa, elevation = 1600 FT (488m)

QFE = 995 hPa, elevation = 1600 FT (488m)

The pressure altitude is equal to the true altitude if
a) the outside air temperature is standard for that height
b) standard atmospheric conditions occur
c) the air pressure is 1013.25 hPa at the surface
d) the indicated altitude is equal to the pressure altitude

standard atmospheric conditions occur

You must make an emergency landing at sea. The QNH of a field on a nearby island with an elevation of 4000 FT is 1025 hPa and the temperature is -20°C. What is your pressure altimeter reading when landing if 1025 hPa is set in the subscale?
a) 4000 FT
b) 0 FT
c) More than 0 FT, but less than 4000 FT
d) Less than 0 FT

Less than 0 FT

In what hPa range is an upper weather chart for FL 340 situated?
a) 300 - 200 hPa
b) 400 - 300 hPa
c) 500 - 400 hPa
d) 600 - 500 hPa

300 - 200 hPa

Isobars on a surface chart are lines of equal
a) QFE
b) QNE
c) QFF
d) QNH

QFF

For a given airfield the QFE is 980 hPa and the QNH is 1000 hPa. The approximate elevation of the airfield is
a) 120 metres
b) 600 metres
c) 540 metres
d) 160 metres

160 metres


Read the question carefully: The units involved are metres, not feet!
Calculate with 27 feet or 8 metres per hPa

Which is true of the temperature at the tropopause?
a) There is no significant difference with change of latitude
b) It is higher in equatorial regions than in polar regions
c) It is highest in middle latitudes
d) It is higher in polar regions than in equatorial regions

It is higher in polar regions than in equatorial regions

The value of the saturated adiabatic lapse rate is closest to that of the dry adiabatic lapse rate in
a) cirrus
b) freezing fog
c) stratus
d) cumulus

cirrus

Around Paris on January 3rd at 1800 UTC, the surface temperature, under shelter, is 3°C. 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 +3°C.
b) slightly below +3°C.
c) significantly below 0°C.
d) significantly above +3°C.

slightly below +3°C.

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 after sunrise
c) half an hour before sunrise
d) one hour before sunrise

half an hour after sunrise

An isohypse (contour)
a) indicates the altitude of the zero degree isotherm
b) indicates the true altitude of a pressure level
c) is the limit between two air masses of different temperature
d) is the longest slope line of a frontal surface

indicates the true altitude of a pressure level

Before landing, an altimeter set to QFE indicates
a) the height of the aircraft's wheels above the runway.
b) the flight level.
c) in standard atmosphere, the height of the aircraft above the official airport elevation.
d) the aircraft's altitude above the mean sea level.

in standard atmosphere, the height of the aircraft above the official airport elevation.

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

11 to 50 km

The weather is clear and the temperature decreases uniformly and rapidly as you climb (approaching 3°C per 1000 ft), you have an indication of:
a) Stable air.
b) Saturation.
c) Unstable air.
d) Sublimation.

Unstable air.

At sea level, the pressure of the atmosphere on a standard day will cause the mercury in the column to rise to:
a) 92.29 inches
b) 19.19 inches
c) 29.29 inches
d) 29.92 inches

29.92 inches

What is dynamic pressure?
a) Turbulence.
b) Centrifugal force.
c) Acceleration force.
d) Pressure caused by movement.

Pressure caused by movement.

The international standard atmosphere (ISA)is defined for mean sea level as :
a) 1015.25 hPa, 15°C, and a density of 1.225 kg/m3.
b) 1015.25 hPa, 15°C, with a lapse rate of 1.98°C per 1000 ft.
c) 1013.25 hPa, 15°C, a temperature lapse rate of 1.98°C per 1000 ft. and a density of 1.225 kg/m3
d) 1013.25 hPa, 15°C, a temperature lapse rate of 1.98°C per 1000 ft. and a humidity of 5%.

1013.25 hPa, 15°C, a temperature lapse rate of 1.98°C per 1000 ft. and a density of 1.225 kg/m3

The percentage concentration of gases in the atmosphere is constant from the surface of the earth to a certain altitude with the exception of:
a) Water vapour
b) Nitrogen
c) Hydrogen
d) Oxygen

Water vapour

What altimeter reading would you expect when landing at an airfield 3000 ft above MSL, altimeter setting is QFE for the field and local temperature is + 25°C?
a) 0 ft.
b) 3000 ft.
c) 2700 ft.
d) 3300 ft.

0 ft.

Lines connecting points of equal pressure are called:
a) Isogonic lines.
b) Barometric.
c) Agonic.
d) Isobars.

Isobars.

The temperature is -15°C on an airport 3000' above mean sea level.
Which of the following is true?
a) QFF = QFE
b) QFF > QNH
c) QFF = QNH
d) QNH = QFE

QFF > QNH

The temperature gradient in the international standard atmosphere (ISA) is:
a) 1°C/100m.
b) 0.65°C/100m
c) 0,5°C/100m.
d) 0.6°C/100m.

0.65°C/100m

Absolute instability in a layer of air is characterized by the vertical temperature gradient in the layer being:
a) Less than 0.65°/100 m.
b) Greater than 0.5°/100 m.
c) Greater than 1°/100 m.
d) Less than 0.6°/100 m.

Greater than 1°/100 m.

Define the tropopause:
a) A relatively thin layer, or boundary zone, which separates the lower atmosphere from the tropopause
b) A relatively thick layer or boundary zone below the troposphere.
c) That area where the temperature change does not exceed two-thirds of one degree Celsius per thousand foot increase in altitude independent of latitude.
d) That area where the temperature change does not exceed two-thirds of one degree Celsius per thousand foot increase in altitude over a range of 6000 feet.

That area where the temperature change does not exceed two-thirds of one degree Celsius per thousand foot increase in altitude over a range of 6000 feet.

An inversion is characterized by:
a) Increasing temperature with increasing altitude.
b) Parts of the air mass at each level is warmer than surrounding air.
c) The tendency to increase relative humidity with increasing altitude.
d) Constant temperature with increasing altitude

Increasing temperature with increasing altitude.

Which of the following combinations contain the greatest air density?
a) High pressure and high temperature.
b) Low pressure and high temperature.
c) High pressure and low temperature.
d) Low pressure and low temperature.

High pressure and low temperature.

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