(2) 5-15 minutes and 8 km (3) 5-10 minutes and 12 km (4) 1-5 minutes and 4 km --- Question n° 754 - ID 1201
The polar front is the boundary between: (1) polar air and tropical air.
(2) arctic air and polar air. (3) arctic air and tropical air.
(4) maritime polar air and continental polar air.
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Question n° 755 - ID 13818
Which of the following statements concerning the tropopause is correct? (1) The temperature lapse rate changes abruptly at the tropopause.
(2) The temperature of the tropopause at the equator and at the poles is equal. (3) The temperature of the tropopause at the equator is higher than at the poles. (4) The temperature remains constant above and below the tropopause.
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Question n° 756 - ID 10964
Which of the following sets of conditions are most favourable to the development of thunderstorms?
(1) Environmental lapse rate less than dry adiabatic lapse rate with freezing level below the cloud base, high relative humidity and strong surface winds
(2) Extensive isothermal layer, ice particles and water droplets must exist just below the freezing level and orographic lifting
(3) Environmental lapse rate greater than saturated adiabatic lapse rate through a great vertical extent, high relative humidity and an initial lifting process
(4) Environmental lapse rate less than saturated adiabatic lapse rate with dew point below CTC and considerable surface heating ---
Question n° 757 - ID 10907
On the Significant Weather Chart, we see the following indications:; SCT CU100/060; The forecast charts for FL 050 and FL 100 both indicate a wind from 320715 kt. In flight at FL 055 over an area of plains (flat country) during the validity period of the Significant Weather Chart, we observe moderate turbulence. This turbulence is caused by
(1) system waves. (2) the surface radiation. (3) a wind shear.
(4) the instability of the air mass between the surface and the top of Cumulus clouds.
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Question n° 758 - ID 12855
What is the lowest visibility forecast for Bangkok at ETA 1400 UTC ? TAF VTBD 271800Z 280024 VRB05KT 1200 BR TEMPO 0002 4000 BECMG 0205 9999 SCT015 BKN100 TEMPO 1118 04010G20KT 5000 TSRASCT009 BKN014 BKN018CB BECMG 2024 6000= (1) 10 km or more (2) 5 km (3) 6 km (4) 1200 metres --- Question n° 759 - ID 10957
When visibility is reduced by water droplets to less than 1000 metres it is classified as (1) haze
(2) mist (3) fog (4) dust fog
148
Question n° 760 - ID 12829
Which statement is correct for microbursts ? (1) They occur in the tropics only
(2) The diameter of the affected area on the surface does not exceed 4 km (3) They only develop below convective clouds with heavy rain
(4) Their downdraft is warmer than the surroundings
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Question n° 761 - ID 455
Which of the following statements is true regarding moderate to severe airframe icing? (1) It is likely to occur in nimbostratus cloud
(2) It may occur in the uppermost levels of a cumulonimbus capillatus formation (3) It will occur in clear-sky conditions
(4) It always occurs in altostratus cloud
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Question n° 762 - ID 1595
In which of the following regions does maritime polar air originate? (1) Baltic Sea
(2) Black Sea
(3) Region of British Isles (4) East of Greenland
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Question n° 763 - ID 2243
The QNH at an airfield located 200 metres above sea level is 1022 hPa. The air temperature is not available. What is the QFF? (1) It is not possible to give a definitive answer
(2) More than 1022 hPa (3) 1022 hPa
(4) Less than 1022 hPa
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Question n° 764 - ID 2601
Which of the following weather reports could be, in accordance with the regulations, abbreviated to "CAVOK"? (1) 24009KT 6000 RA SCT010 OVC030 12/11 Q1007 TEMPO 4000 =
(2) 15003KT9999BKN100 17/11 O1024NOSIG = (3) 04012G26KT 9999 BKN030 11/07 Q1024 NOSIG =
(4) 29010KT 9999 SCT045TCU 16/12 Q1015 RESHRA NOSIG =
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Question n° 765 - ID 1288
On which of the following aviation weather charts can a pilot most easily find a Jetstream? (1) Wind / temperature chart.
(2) Surface chart.
(3) Significant weather chart. (4) Upper air chart.
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Question n° 766 - ID 4202
For a given airfield the QFE is 980 hPa and the QNH is 1000 hPa. The approximate elevation of the airfield is (1) 600 metres (2) 540 metres (3) 160 metres (4) 120 metres --- Question n° 767 - ID 1546
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(1) Highest value of ONH and the highest negative temperature deviation from ISA. (2) Lowest value of QNH and the highest negative temperature deviation from ISA. (3) Highest value of ONH and the highest positive temperature deviation from ISA (4) Lowest value of QNH and the lowest negative temperature deviation from ISA
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Question n° 768 - ID 1703
What OAT would you expect at FL 200 over Geneva ? (1) -20°C (2) -28°C (3) -24°C (4) -i6°e x -24°C --- Question n° 769 - ID 66
If atmospheric conditions exist such that the temperature deviation is ISA +1CTC in the lower troposphere up to 18000 FT, what is the actual layer thickness between FL 60 and FL 120 ?
(1) 5900 FT. (2) 6000 FT. (3) 6240 FT. (4) 5760 FT. --- Question n° 770 - ID 1617
In general, the visibility during rainfall compared to during drizzle is (1) less
(2) greater
(3) in rain - below 1 km, in drizzle - more than 2 km (4) the same
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150
Which of the following best describes Zone C? (1) Trough of low pressure
(2) Col (3) Depression
(4) ridge of high pressure
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Question n° 772 - ID 1251
What degree of turbulence, if any, is likely to be encountered while flying through a cold front in the summer over Central Europe at FL 100? (1) Severe turbulence in CB cloud.
(2) Light turbulence in ST cloud. (3) Light turbulence in CB cloud. (4) Moderate turbulence in NS cloud.
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Question n° 773 - ID 1252
You are flying at 2 500 FT/AGL, the wind is 180°, an d intend to land at an airport, at sea level directly below. From approximately which direction would you expect the surface wind (mid-latitude, northern hemisphere)?
(1) South-southwest. (2) South-southeast. (3) South. (4) Southwest. --- Question n° 774 - ID 2594
Which of the following phenomena can produce a risk of aquaplaning? (1) +RA (2) BCFG (3) FG (4) SA --- Question n° 775 - ID 13649
In the northern hemisphere advection of warm air aloft indicates: (1) the approach of a warm occlusion.
(2) the formation of advection fog. (3) backing winds with increasing heights. (4) increasing probability for showers.
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Question n° 776 - ID 2564
At what degree of icing should ICAO's "Change course and/or altitude immediately" instruction be followed? (1) Extreme (2) Moderate (3) Severe (4) Light --- Question n° 777 - ID 1701
Over Amsterdam, what amount and general type of cloud would you expect at FL 160 ? (1) Mainly 5 to 8 oktas of stratiform cloud in layers
(2) 4 oktas broken cumulus
(3) 5 to 7 oktas towering cumuliform cloud and with moderate turbulence (4) Isolated cumulonimbus only
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Question n° 778 - ID 3739
Subsidence is:
(1) vertically downwards motion of air (2) vertically upwards motion of air (3) horizontal motion of air (4) the same as convection
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Question n° 779 - ID 1218
Which of the following types of clouds are evidence of unstable air conditions? (1) CU.CB. (2) CI.SC. (3) ST, CS. (4) SC.NS. --- Question n° 780 - ID 2520
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? (1) 19310ft
152
(3) 20630 ft (4) 18290 ft
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Question n° 781 - ID 1223
Which of the following clouds may extend into more than one layer? (1) Cirrus. (2) Stratus. (3) Nimbostratus. (4) Altocumulus. --- Question n° 782 - ID 4171
Above and below a low level inversion the wind is likely to (1) change significantly in speed and direction
(2) change in speed but not in direction (3) change in direction but not in speed
(4) experience little or no change in speed and direction
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Question n° 783 - ID 4082
A dry, sand- and dust-laden North Easterly wind that blows in winter over large parts of North West Africa is known as a (1) Khamsin (2) Scirocco (3) Harmattan (4) Pampero --- Question n° 784 - ID 1553
Which of the following weather reports is a warning of conditions that could be potentially hazardous to aircraft in flight ? (1) SPECI. (2) TAF. (3) ATIS. (4) SIGMET. --- Question n° 785 - ID 10895
In mid-latitudes, the tops of Cumulus are often limited by (1) the tropopause
(2) a radiation inversion (3) a temperature inversion (4) a layer of unstable air
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Question n° 786 - ID 1278
After passing at right angles through a very active cold front in the direction towards the cold air, what will you encounter at FL 50, in the northern hemisphere immediately after a marked change in temperature?
(1) A backing in the wind direction. (2) A veering in the wind direction. (3) An increase in tailwind. (4) A decrease in tailwind.
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Question n° 787 - ID 236
What winds and air mass characteristics are mainly associated with the winter monsoon in the monsoon regions of the Indian sub-continent? (1) South-easterly winds carrying warm and humid air.
(2) North-westerly winds bringing dry and hazy air. (3) South-westerly winds carrying warm and humid air.
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(4) North-easterly winds bringing dry and hazy air.
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Question n° 788 - ID 227
You intend to carry out a VFR flight over the Alps, on a fine and hot summer day. What is the best time of day to conduct this flight? (1) Afternoon. (2) Morning. (3) Early evening. (4) Mid-day. --- Question n° 789 - ID 2499
The temperature at FL 110 is -5*C. What will the temperature be at FL 50 if the ICAO standard lapse rate is applied ? (1) +3°C (2) -3°C (3) o°c (4) +7°C --- Question n° 790 - ID 4182
Runway visual range can be reported in (1) a METAR
(2) aTAF (3) a SIGMET
(4) both a TAF and a METAR
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Question n° 791 - ID 10974
Which statement about hurricanes in the North Atlantic is correct? (1) They move towards the equator
(2) Their eye can be well observed by weather satellites (3) They intensify after landfall
(4) They move with a speed of at least 60 kt
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Question n° 792 - ID 1365
Which one of the tracks (dashed lines) is represented by the cross-section shown on the left ? (1) Track B-C (2) Track D-A (3) Track C-A (4) Track B-A --- Question n° 793 - ID 2591
Which of the following phenomena should be described as precipitation at the time they are observed? (1) +SHSN; (2) BR; (3) MIFG; (4) VA; --- Question n° 794 - ID 4169 An inversion is
(1) a decrease of temperature with height (2) an increase of pressure with height (3) a decrease of pressure with height (4) an increase of temperature with height
154
Question n° 795 - ID 12863
Which type of air mass never occurs over central Europe ? (1) Equatorial air (2) Tropical air (3) Polar air (4) Arctic air --- Question n° 796 - ID 4040
Altostratus clouds are classified as (1) low level clouds
(2) medium level clouds (3) high level clouds (4) convective clouds
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Question n° 797 - ID 1577
What positions are connected by isobars on the surface weather chart? (1) Positions with the same air pressure at a given level
(2) Positions with the same relative pressure heights (3) Positions with the same temperature at a given level (4) Positions with the same wind velocity at a given level
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Question n° 798 - ID 13665
An occlusion is called a warm occlusion when the cold air
(1) at the rear of the occlusion is less cold than the cold air ahead, with the warm air at a higher altitude. (2) at the rear of the occlusion is colder than the cold air ahead, with the warm air at a higher altitude. (3) ahead of the surface position of the occlusion is only at a higher altitude.
(4) at the rear of the occlusion is colder than the cold air ahead.
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Question n° 799 - ID 19
At a certain position, the temperature on 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 ?
(1) -58°C. (2) -50°C. (3) -54°C. (4) -56,5°C. --- Question n° 800 - ID 2536
According to ICAO, which symbol indicates widespread haze ? (1) Symbol b) (2) Symbol d) (3) Symbol c) (4) Symbol a) --- Question n° 801 - ID 2534
According to ICAO, which symbol indicates severe icing ? (1) Symbol b)
(2) Symbol d) (3) Symbol c) (4) Symbol a)
155
Question n° 802 - ID 1550
An aircraft lands at an airport (airport elevation 1240 FT, QNH 1008 hPa). The altimeter is set to 1013 hPa. The altimeter will indicate: (1) 1200 FT. (2) 1375 FT. (3) 1105 FT. (4) 1280 FT. --- Question n° 803 - ID 14146
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 summif's elevation? (1) There is insufficient information to come to a conclusion;
(2) A lower altitude than the elevation of the summit; (3) A higher altitude than the elevation of the summit; (4) The same altitude as the elevation of the summit;
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Question n° 804 - ID 13825
Which of the following statements is correct? (1) Airframe icing can occur in clear air (2) Above the tropopause no turbulence occurs
(3) Mountain waves are always accompanied by rotor clouds
(4) Haze is a reduction of visibility due to the presence of water vapour
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Question n° 805 - ID 13609
The slope and speed of a warm front compared to the slope and speed of a cold front is in general: (1) smaller and slower.
(2) greater and slower. (3) greater and faster. (4) smaller and faster.
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Question n° 806 - ID 4261
Which one of the following statements is correct concerning the movement of the ITCZ in the region of West Africa? (1) It reaches its maximum northerly position of 15* - 20° N in July
(2) It oscillates during the year between the Equator and 10 degrees North. (3) It reaches its maximum southerly position of 5* S in January
(4) It oscillates during the year between 10 degrees North and 10 degrees South.
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Question n° 807 - ID 13656
Absolute instability is said to exist whenever the environmental lapse rate (1) exceeds the dry adiabatic lapse rate
(2) is less than the saturated adiabatic lapse rate (3) is less than the dry adiabatic lapse rate
(4) is between the dry and saturated adiabatic lapse rate
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Question n° 808 - ID 1985
A wind sounding in the region of a polar front jet stream gives the following windprofile (Northern hemisphere).; 900hPa 220/20kt ; 800hPa 220/25kt ; 700hPa 230/35kt ; 500hPa 260/60kt ; 400hPa 280/85kt; 300hPa 300/1 OOkt; 250hPa 310/120kt; 200hPa 310/80kt; Which system is the jet stream associated with?
(1) With a ITCZ. (2) With a warm front. (3) With an easterly wave. (4) With a cold front.
156
Question n° 809 - ID 62
A layer is conditionally unstable if the air
(1) is unstable for saturated air and stable for dry air. (2) is unstable for saturated air as well as for dry air. (3) becomes stable by lifting it.
(4) is stable for saturated air and unstable for dry air.
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Question n° 810 - ID 2718
The intertropical convergence zone (ITCZ) particularly affects (1) western Africa, at a latitude of 25*N in July.
(2) western Africa between 1CTN and 2CTN and the northern coasts of the Arabian sea in July.
(3) western Africa, where it is situated between the 1CTN and 3CTN parallels, depending on the time of the year. (4) the Atlantic ocean, between latitudes 1CTN and 3CTN, depending on the time of year.
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Question n° 811 - ID 3719
The temperature at 10000 FT in the ICAO Standard Atmosphere is: (1) o°c (2) -5°C (3) -35°C (4) -20°C --- Question n° 812 - ID 1316
The QNH of an airport at sea level is 983 hPa and the temperature deviation from ISA is -15°C below FL 10 0. What is the true altitude of FL 100? (1) 11460 ft (2) 10160 ft (3) 8640 ft (4) 9740 ft --- Question n° 813 - ID 4252
Which of the following factors have the greatest effect on the formation of the various types of ice on an aircraft ? (1) Aircraft speed and curvature of the airfoil
(2) Relative humidity inside the cloud (3) Aircraft speed and size of cloud droplets (4) Cloud temperature and droplet size
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Question n° 814 - ID 1601
Which of the following describes a warm occlusion?
(1) The air mass ahead of the front is drier than the air mass behind the front (2) The coldest air mass is ahead of the original warm front
(3) The air mass behind the front is more unstable than the air mass ahead of the front (4) The warmer air mass is ahead of the original warm front
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Question n° 815 - ID 1555
After landing at an aerodrome (aerodrome elevation 1715 FT), the altimeter indicates an altitude of 1310 FT. The altimeter is set to the pressure value of 1013 hPa. What is the QNH at this aerodrome?
(1) 1015 hPa. (2) 998 hPa. (3) 1028 hPa. (4) 1013 hPa.
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Question n° 816 - ID 10396
In relation to the polar front jet stream, the greatest rate of wind shear is most likely to occur (1) close to the core on the polar side
(2) 5000 FT or more above the core (3) well below the core
(4) on the tropical side of the core
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Question n° 817 - ID 1588
In which of the following conditions is moderate to severe airframe icing most likely to be encountered? (1) In Nimbostratus cloud
(2) Below the freezing level in clear air (3) In clear air above the freezing level (4) Within cloud of any type
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Question n° 818 - ID 13688
The QNH of an airport at sea level is 983 hPa and the temperature deviation from ISA is -15°C below FL 10 0. What is the true altitude of FL 100? (1) 9740 ft (2) 10160 ft (3) 11460 ft (4) 8640 ft --- Question n° 819 - ID 1200
Which of the following is a possible consequence of subsidence? (1) An inversion over a large area with haze, mist.
(2) Clear air turbulence at higher altitudes . (3) CB-clouds and thunderstorms over a large area. (4) Wide spread NS and AS clouds and intense precipitation.
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Question n° 820 - ID 4152
Clear ice forms as a result of
(1) ice pellets splattering on the aircraft
(2) supercooled water droplets spreading during the freezing process (3) water vapour freezing to the aircraft
(4) supercooled droplets freezing on impact
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Question n° 821 - ID 1281
What is the likely track for a hurricane in the Caribbean area? (1) West in the earlier stages and later turning north east. (2) West in the earlier stages and later turning south east. (3) East then south.
(4) West deep into the USA.
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Question n° 822 - ID 4074
In a mountain-valley wind circulation, the mountain wind blows (1) during the day up from the valley
(2) at night up from the valley (3) at night down from the mountains (4) during the day down from the mountains
158
Question n° 823 - ID 10947
What is the meaning of the expression "FEW"? (1) 1 - 2 oktas. (2) 8 oktas. (3) 3-4 oktas. (4) 5-7 oktas. --- Question n° 824 - ID 65
The temperature at FL 140 is -12°C. What will the tem perature be at FL 110 if the ICAO standard lapse rate is applied ? (1) -18°C. (2) -9°e. (3) -15°C. (4) -6°e. x -6°C. --- Question n° 825 - ID 4033
A moist but unsaturated parcel of air becomes saturated by
(1) moving the parcel to an area with lower pressure and equal temperature (2) moving the parcel to an area with higher pressure and equal temperature (3) lifting the parcel to a higher level
(4) lowering the parcel to a lower level
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Question n° 826 - ID 10366
An unstable air mass will normally be characterised by (1) poor visibility due to haze at the lower levels (2) stratiform cloud
(3) continuous light rain from medium level layer cloud (4) cumuliform cloud and good visibility except in precipitation
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Question n° 827 - ID 10905
In a METAR message, the wind group is 23010MPS. This means: (1) Wind from 230* magnetic at 10 miles per hour
(2) Wind from 230° magnetic at 20 knots (3) Wind from 230° true at 10 miles per hour (4) Wind from 230° true at 20 knots
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Question n° 828 - ID 4163
An aircraft is flying at FL 180 in the northern hemisphere with a crosswind from the left. Which of the following is correct concerning its true altitude ?
(1) It decreases (2) It remains constant (3) It increases
(4) Without knowing temperatures at FL 180 this question can not be answered.
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Question n° 829 - ID 4140
The rate of cooling of ascending saturated air is less than the rate of cooling of ascending unsaturated air because: (1) water vapour absorbs the incoming heat from the sun
(2) water vapour doesn't cool as rapidly as dry air (3) moist air is heavier than dry air
(4) heat is released during the condensation process
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159
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?
(1) The true altitude will be higher at B than at A (2) The true altitude will be higher at A than at B (3) Wind speed at A is higher than at B (4) Wind speed at Paris is higher than at B
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Question n° 831 - ID 2605
Which of the following statements is an interpretation of the SIGMET ? LGGG SIGMET 3 VALID 121420/121820 LGAT- ATHINAI FIR EMBD TS OBS AND FCST IN W PART MOV E NC =
(1) Thunderstorms have formed in the eastern part of the Athens FIR and are slowly moving west
(2) Thunderstorms must be expected in the western part of the Athens FIR. The thunderstorm zone is moving east. Intensity is constant (3) The thunderstorms in the Athens FIR are increasing in intensity, but are stationary above the western part of the Athens FIR (4) Athens Airport is closed due to thunderstorms. The thunderstorm zone should be east of Athens by 1820 UTC
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Question n° 832 - ID 1677
What is the optimum flight level between Rome and Paris according to the significant weather chart? (1) FL160 (2) FL360 (3) FL220 (4) FL340 --- Question n° 833 - ID 10363
At about what geographical latitude as average is assumed for the zone of prevailing westerlies? (1) 10°N. (2) 80°N. (3) 50°N. (4) 30°N. --- Question n° 834 - ID 13588
The typical weather conditions affecting the Darwin area during July are