Statistics for METEOROLOGY 050

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This quiz has been taken 301 times
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The average score is 48 of 144

Answer Stats

Question	Answer	% Correct
What is density defined as?	Mass per unit volume.	69%
Which of the statements below best describes a Col?	An area of widely spaced isobars between two highs and two lows.	65%
What is the ATIS?	A continuous broadcast of current aerodrome and weather information.	64%
BECMG 1621/1701 BKN030 in a TAF means:	Becoming between 2100 UTC on the 16 of the month and 0100 UTC on the 17 of the month 5-7 oktas of cloud at 3000 ft agl.	61%
On what frequency range is the ATIS usually broadcast?	VHF.	61%
You are flying above the freezing level in the cold air just ahead of a warm front. If rain were to fall in this area, what kind of icing might you expect?	Rain or clear ice.	59%
In cumulonimbus clouds there are large supercooled water droplets that form:	Clear ice	58%
FEW in weather report means that:	1-2/8 of the sky is occupied by clouds	55%
Where is most of the water vapour in the atmosphere contained?	Troposphere.	54%
Precipitation produced by stratus is normally?	Drizzle.	53%
The abbreviation "SWC" means:	Significant weather chart	51%
The extent of rainfall ahead of a typical warm front may be up to a distance of:	200 miles ahead of the surface position of the warm front.	50%
When condensation takes place, the higher the temperature the ____ the amount of latent heat ____:	Greater / released.	50%
One or more coloured rings around the sun or moon may indicate the presence of which type of cloud?	Altostratus or cirrostratus.	48%
TEMPO group in weather report means:	Conditions which are expected to last for generally less than half the time period of whole change group.	48%
In a mountain wave situation, the worst of the turbulence is most likely to be found when flying:	In or just below the roll cloud.	48%
The temperature at 2000ft above mean sea level is forecast to be 5°C; compared to the ICAO Standard Atmosphere (ISA) this is:	ISA -6.	46%
In which environment is aircraft structural ice most likely to have the highest accumulation rate?	Freezing rain.	45%
What are the proportions of gases in the atmosphere?	Oxygen 21%, Nitrogen 78%, other gasses 1%.	45%
"Thundercloud" is officially known as:	Cumulonimbus	44%
What type of precipitations was observed accordingly to the following METAR report? METAR LSZH 131630Z 24008KT 0600 R16/1000U FG DZ FEW003 SCT010 OVC020 17/16 Q1018 BECMG TL1700 0800 FG BECMG AT1800 9999 NSW=	Moderate drizzle.	44%
What is the approximate base of cumulus clouds if the surface air temperature is 27°C and the dewpoint is 15°C?	1.500m.	43%
A line drawn on a chart joining places having the same barometric pressure at the same level and at the same time is?	An isobar.	43%
The conditions which must exist to allow thunderstorms to develop are:	A plentiful supply of moisture and a steep lapse rate through a large vertical extent, together with a trigger action.	43%
Which of the processes listed below can cause air to become saturated?	Evaporation.	43%
An aircraft flies at a constant indicated altitude from airfield A (QNH 1009 hPa) to airfield B (QNH 1019 hPa). If the subscale is not reset from 1009, what would be expected when over airfield B:	Indicated altitude to be less than actual altitude.	43%
A light aircraft flying at low level near a mountain range across which a strong wind is blowing may expect: 1. Severe turbulence below or within any rotor zone. 2. Down-draughts which may exceed the climb rate of the aircraft. 3. A greater than normal risk of icing in the cloud over the crest mountain. 4. Lenticular cloud	1,2, 3 and 4 are correct.	41%
Diurnal variation of the surface temperature will:	Decrease as wind speed increases.	41%
There is thunderstorm activity in the vicinity of an airport at which you plan to land, which hazardous atmospheric phenomenon might be expected on the landing approach?	Windshear.	41%
During a night with a clear sky, surface temperature will ____, relative humidity will ____ and dewpoint will ____.	Fall / Rise / Remain the same.	40%
The atmospheric pressure (QNH) reported in METARs is adjusted to:	Mean sea level	40%
What kind of weather is forecast for the period after 12:00 UTC? TAF LYBE 160500Z 1606/1706 13010KT 9000 BKN020 BECMG 1606/1608 SCT015CB BKN020 TEMPO 1608/1612 17012G22KT 1000 TSRA SCT010CB BKN020 FM161200 15006KT 9999 BKN020 BKN100=	Moderate southeasterly wind with visibility improvement to more than 10 km, precipitations will stop, cloudiness will become greater with ceiling at 600 m.	40%
What is the main reason water can exist in a liquid state even though the temperature is sub zero?	No freezing nuclei.	40%
What is the code for "nearby the aerodrome" in weather reports?	VC	40%
VOLMETS is defined as:	A continuous radio broadcast of selected aerodrome actual weather observations and forecasts.	39%
Hail is most likely to fall from which type of cloud?	CB	39%
With what type of clouds are shower precipitations associated?	CB.	39%
Wet bulb temperature would normally be lower than dry bulb temperature because:	Evaporation causes cooling on the wet bulb thermometer.	39%
In the ATIS broadcast, what is used to identify the current report?	An alphabetical code.	38%
Low-pressure area in Northern hemisphere spins:	Counter-clockwise	38%
Why is frost considered hazardous to flight?	Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability.	38%
Continuous rain is usually from:	Nimbostratus	38%
Wind is caused by:	Pressure differences	38%
What is the approximate airfield dewpoint if the surface air temperature is 20 °C and the reported base of the cumulus clouds is 1100m above the airfield level?	11°C.	36%
Accordingly to the code which of the following METAR reports could be partially abbreviated by CAVOK (minimum sector altitude 4000 ft)?	27019G37KT 9999 BKN050 18/14 Q1016 NOSIG=	36%
Clear ice forms as a result of:	Large supercooled water droplets spreading as they freeze.	36%
The use of the suffix "nimbus" or the prefix "nimbo" means?	Rain bearing.	36%
"CAVOK" term is used in weather reports when:	Visibility is min. 10 km, ceiling is min. 5000 ft and no significant weather change	36%
When an altimeter sub scale is set to the aerodrome QFE, the altimeter reads:	Zero at the aerodrome reference point.	36%
When are ATIS broadcasts updated?	Any time the aerodrome or weather information changes.	35%
Where does windshear occur?	At all altitudes, in all directions	35%
A low level mist layer significantly reduces forward visibility when flying at about 2000ft. To improve your forward visibility you should:	Fly higher.	35%
What will normally happen to the surface wind direction following the passage of a warm front?	Veer.	35%
When a TREND is included at the end of an aviation METAR, the trend is a forecast valid for:	2 hours after the time of observation.	34%
What was the ceiling of the lowest cloud layer accordingly to the following METAR report? METAR LSZH 131630Z 24008KT 0600 R16/1000U FG DZ FEW003 SCT010 OVC020 17/16 Q1018 BECMG TL1700 0800 FG BECMG AT1800 9999 NSW=	300ft.	34%
Transition altitude is in Finland:	5000 FT (QNH)	34%
The amount of water vapor which air can hold depends on the:	Air temperature.	34%
What is the significance of tightly spaced isobars?	A large pressure gradient and strong winds.	34%
If temperature remains constant with an increase in altitude there is:	An isothermal layer.	34%
What types clouds usually accompany the passage of a warm front?	CI, CS, AS, NS.	34%
The pressure of the atmosphere:	Decreases at a decreasing rate as height increases.	34%
What is the code for "hail" in weather reports?	GR	34%
What stage of a thunderstorm is characterised by updraughts only?	Initial stage.	34%
Providing the minimum sector altitude is not a determining factor, CAVOK in a TAF or METAR:	Means visibility 10km or more, and no cloud below 5.000ft.	34%
Generally as altitude increases:	Temperature, pressure and density decreases.	34%
Given a surface temperature of +21°C and a dew point of +7°C, at approximately what height will the cloud base of a cumulus cloud be?	5.600ft.	33%
An area of indeterminate pressure between two lows and two highs is called:	A col.	33%
You are flying at a constant indicated altitude with the QNH of 1015 set within the subscale and you notice the outside air temperature has been falling constantly. What can you expect to have happened to your true altitude?	Decreased.	33%
What is the code for "drizzle" in weather reports?	DZ	33%
During the winter months, which of the following weather conditions would most likely be produced by an anticyclone?	General subsidence with adiabatic warming, clear skies, and an inversion.	33%
In the METAR shown below, the cloud base has been omitted. At what height might you expect the cloud base to be if cumulus cloud was present? 28005KT9999 SCT??? 12/05 Q1020 NOSIG	SCT028.	33%
From the list below, select the Low, Medium and High clouds in ascending order.	Stratus, Altocumulus, Cirrus.	33%
A temperature group of 28/24 in a METAR means that:	The temperature is 28°C and the dew point is 24°C.	33%
The layer closest to the earth's surface where the majority of weather is found is called?	Troposphere.	33%
What approximate base of cumulus clouds should be expected if the surface air dewpoint is 5°C and the forecasted daily maximum temperature is 25°C?	2.500m.	31%
Inversion is a layer in the atmosphere where:	Air temperature increases with height	31%
What weather phenomena is associated with a temperature inversion?	A stable layer of air.	31%
What value is being calculated by following formula? Temperature minus dewpoint times 123 = ?	Ceiling of cumulus clouds in meters.	31%
Hazards of the mature stage of a thunderstorm cell include lightning, turbulence and:	Icing, microburst and windshear.	31%
Which of the following is true about the lowest level windshear?	It may be experienced 15 to 20 miles ahead of a fast moving thunderstorm.	31%
Thunderstorms reach their greatest intensity during the:	Mature stage.	31%
What wind represents depicted symbol from meteorological charts? (See LAPL/PPL 050-05)	West wind at 60 knots	31%
Hazards to aircraft caused by the presence of cumulonimbus or thunderstorm cloud may be experienced:	When the aircraft is in the vicinity.	31%
What is the density at sea level in the International Standard Atmosphere?	1225g/m³.	30%
The wind at 2000 ft over an aerodrome was reported at 330/15kt. Using the rule of thumb, what might you expect the surface wind to be?	300/07 kt.	30%
A regional is a forecast of the weather up to?	FL100.	30%
A line on a weather chart connecting points of equal atmospheric pressure is called:	Isobar	30%
Density at the surface will be low when:	Pressure is low and temperature is high.	30%
The most frequent type of ground or surface-based temperature inversion is that which is produced by:	Terrestrial radiation on a clear, relatively still night.	30%
The altimeter will always read:	The vertical distance above the pressure level set in the sub scale.	30%
Gusts are reported in weather reports:	When they are more than 10 kts from average wind	30%
What air temperature may we expect at 7000 ft if the air temperature at 1500 ft is 15°C?	+4°C.	29%
For cumulonimbus clouds to develop, there needs to exist:	A deep layer of very unstable moist air.	29%
Below the tropopause, the ICAO Standard Atmosphere (ISA) assumes?	A mean sea level pressure of 1013.25 hPa together with a mean sea level temperature of 15°C, decreasing by 1.98°C per 1000ft up to 36 090ft.	29%
VOLMETS are?	Ground to air radio transmissions on HF and VHF.	29%
A ridge of high pressure is generally associated with:	Subsidence of air, then divergence at the surface causing clear skies and poor visibility.	29%
An inversion is when:	There is an increase of temperature as height increases.	29%
An aircraft flies from aerodrome "A", where QNH is given as 1020 hPa, to aerodrome "B", where the QNH is given as 999 hPa. Aerodrome "A" is 800ft above mean sea level and aerodrome "B" is 500ft above mean sea level. If the altimeter sub scale is not changed from 1020, what is the altimeter indication on landing? (ASSUME 1 hPa = 30ft)	1.130 ft.	28%
Under what conditions would density be the least at any given place?	High altitude, high temperature and high humidity.	28%
"CEILING" is:	Is a measurement of the height of the lowest clouds that cover more than half of the sky relative to the ground	28%
The sun gives out ____ amounts of energy with ____ wavelengths. The earth gives out relatively ____ amounts of energy with relatively ____ wavelengths:	Large / small / small / large.	28%
The actual change of temperature with height is known as:	The environmental lapse rate.	28%
Which of the following conditions are most likely to produce thunderstorms?	A high moisture content with a steep lapse rate.	26%
Low level winds in the northern hemisphere that blow around a depression are drawn on surface weather charts in?	An anticlockwise direction.	26%
What is the name of the instrument which gives a continuous printed reading and record of the atmospheric pressure?	Barograph.	26%
The code "BECMG FM 1100 -SHRA" in a METAR means:	Becoming, from 1100 UTC, slight rain showers.	26%
Which of the following conditions is most favourable to the formation of radiation fog?	High relative humidity, light winds and a clear sky.	26%
The instrument used for measuring the humidity of air is a:	Hygrometer.	26%
When flying towards a depression at a constant indicated altitude, the true altitude will be:	Lower than indicated.	26%
During the ____ stage of a thunderstorm ceil, the cloud contains ____. Complete the above statement choosing one of the following combinations of words:	Mature / up currents and down currents.	26%
The pilot of an aircraft which is approaching a mountain from the downwind or leeward side, a few hundred feet above ridge level, observes venticular clouds. Which of the following conditions would the pilot expect to encounter as the flight continues?	Strong down-draughts immediately before the ridge of the mountain is reached, with strong up-draughts after passing the ridge to the windward side.	26%
A change of state directly from a solid to a vapour or vice versa is:	Sublimation.	26%
What does this symbol represent on a forecast chart? (See LAPL/PPL 050-03)	Thunderstorms.	26%
Which of the following correctly decodes a TAF that reads: LYBE 161100Z 1612/1712 VRB08KT9999 SCT025?	Valid from 1200 Hr on the 16 of the month to 1200 Hr on the 17 of the month; surface wind will be variable in direction at 8kt with a visibility of 10km or more; 3to4 oktas of cloud with a base of 2.500ft above the aerodrome.	26%
Winds that blow around an anticyclone (high pressure system) at lower levels in the Northern Hemisphere are represented on a low level chart as blowing in:	A clockwise direction.	25%
Which of the following frontal systems is more likely to produce thunderstorm activity?	A cold front.	25%
The visibility group R20/0050 in a METAR means:	As measured by runway measuring equipment for runway 20, a current runway visibility of 50 metres.	25%
What are the codes for "Fog" and "Mist" in weather reports?	FG and BR	25%
Every physical process of weather is accompanied by or is the result of a:	Heat exchange.	25%
The diurnal variation of temperature is:	Reduced anywhere by the presence of cloud.	25%
If a cloudy, granular type of ice is seen to collect and protrude forward from the leading edge of the aerofoil, what type of ice would it most likely be?	Rime ice.	25%
What does this symbol represent on a forecast chart? (See LAPL/PPL 050-04).	Severe icing.	25%
What are the characteristics of the passage of a cold front?	A dew point fall, a temperature fall, and the wind veering.	24%
Unstable air is forced to rise up the side of a mountain. What weather might you expect to see on the windward slopes?	Cloud of extensive vertical development.	24%
The method by which energy is transferred from one body to another with which it is in contact is called:	Conduction.	24%
Which of the following correctly decodes the METAR shown below? METAR EGKL 130350Z 32005KT 0900 0400N DZ BCFG VV002	Observed on the 13th day of the month at 0350Z, surface wind 320°True, 05kt, current visibility 900 metres, minimum visibility 400 metres to the north, moderate drizzle, with fog patches and a vertical visibility of 200ft.	24%
What would be the change in weather following the passage of a typical warm front?	Pressure falls, 8 oktas of cloud with a lowering base and poor visibility.	24%
What are the characteristics of an unstable air mass?	Turbulence and good surface visibility.	24%
The process of change of state from a gas to a liquid is known as:	Condensation in which latent heat is released.	23%
Given an atmospheric situation where the relative humidity is 60% and the ELR is less than the DALR, if air is forced to rise it will be:	Stable and will tend to regain its former position.	23%
An aircraft is flying in the vicinity of a range of hills, lying north-south, across which a wind is blowing from the west to east. Which of the following situations might cause the aircraft to encounter dangerous downdraughts?	When flying west towards the hills from the east.	23%
What stage of a thunderstorm is characterised predominantly by downdraughts?	Dissipating stage.	21%
VOLMETS are updated?	Every half an hour.	21%
Compared to ISA, what does warm air do to the distance represented by a 1 hpa change in pressure?	Increases it.	21%
On WAFC significant weather charts what do the letters "CB" implies?	Moderate to severe icing and turbulence and hail.	21%
Coriolis force in the Northern Hemisphere will cause moving air to be apparently deflected to:	The right and cause the geostrophic wind to blow parallel to the isobars at about 2.000ft agl.	21%
What is the validity time for a WAFC significant weather chart?	For a single fixed time only.	20%
Over an inland airfield radiation fog is reported in the morning. As the wind speed increases to 10 kt what would you expect?	The fog to lift and form low stratus.	20%
A trough of low pressure at the surface is generally associated with:	Convergence causing increased cloud and precipitation.	19%
You experience a constant drift to the right when flying over Europe at a constant indicated altitude. If the altimeter subscale is not updated, this will result in?	Flying at a progressively lower true altitude.	19%
The formation of advection fog is often caused by?	A warm moist air mass under the influence of a moderate wind being cooled to below its dew point by flowing over a much colder surface.	16%
Which of the following combinations of weather-producing variables would be most likely to result in cumuliform clouds, good visibility, showery rain, and possible clear type icing in clouds?	Unstable moist air and orographic lifting.	16%
Which weather conditions should be expected beneath a low-level temperature inversion layer when the relative humidity is high?	Light windshear, poor visibility, haze, and light rain.	15%
Consider the following statements about air density and select the one which is correct?	At any given surface temperature the air density will be greater in anticyclonic conditions than it will be when the mean sea level pressure is lower.	10%