Font size
WorksheetsMET1352
Total questions: 97
Worksheet time: 52mins
How is advection fog formed?
Warm and moist air moves over cooler surfaces and is cooled below saturation temperature
By the cooling of land after sunset by thermal radiation in calm conditions with clear sky
When winds blow air up a slope and adiabatically cooling it as it rises, and causing the moisture in it to condense
When cold air is warmed from below, and it condensate as it rises
Where does meteorological information come from?
Passenger reports
Aircraft reports
Weather radar
Airport equipment
Which unit of measurement is used to indicate air pressure for international meteorological purposes?
hPa
Kg/m3
psi
KPa
VAAC (Volcanic Ash Advisory Centre) issues warnings in the form of NOTAM and SIGMET messages.
True
False
Which of the following weather phenomena could most likely be the reason for aircraft accidents?
Reduced visibility
Thunderstorm
Earthquake
Turbulence
What temperature scale is used for international meteorological purposes?
Celsius
Kelvin
Réaumur
Fahrenheit
What instrument is used to measure wind?
Anemometer
Barometer
Transmissometer
Ceilometer
Which instrument is used to measure visibility and RVR?
Anemometer
Forward Scatter meter
Barometer
Ceilometer
What is measured by the ceilometer?
Visibility and RVR
Cloud height
Temperature
Wind Speed
Cloud coverage is reported in hectas.
True
False
What is the relationship between temperature and density?
As temperature increases, density decreases
As temperature decreases, density decreases
There is no relationship between density and temperature
As temperature increases, density increases
What is the main objective of Meteorological service?
Create forecasts
Environment protection
Economy
Safety
(a)
is the airspace between the transition altitude and the transition level.
The tropopause is the layer between Exosphere and Thermosphere.
True
False
What is the correct meaning of the term hypoxia?
Hypoxia is a state of disorientation in space and may result in unintended flying manoeuvres
Hypoxia is a state of oxygen deficiency in blood and cells sufficient to cause impairment
Hypoxia is what happens when oxygen exceeds hydrogen in the aeroplane
Hypoxia is a state of unconsciousness
What is the definition of QNH?
The indicated altitude when 1013.25 hPa is set in the altimeter
Local pressure reduced to MSL according to ISA atmosphere
Actual altitude divided by 100
The barometric pressure at the level of an aerodrome
Which statement is correct regarding the International Standard Atmosphere?
MSL pressure is 1013.25 hPa and base temperature is -56,5°C
MSL pressure is 1013.25 hPa and base temperature is 13°C
MSL pressure is 1,225 hPa and base temperature is 15°C
MSL pressure is 1013.25 hPa and base temperature is 15°C
How does temperature vary in the troposphere?
Temperature first decreases and then increases with altitude
Temperature increases with altitude
Temperature decreases with altitude
Temperature is almost constant
What is a line on a weather chart connecting points of equal pressure called?
Isobars
Isogons
Isotasks
Isotherms
What is the relationship between pressure and height?
Pressure is constant regardless of height
The higher the height, the lower the pressure
There is no relationship between pressure and height
The higher the height, the higher the pressure
(a)
means the lowest flight level available for use above the transition altitude.
(a) means the altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes.
What is ISA an abbreviation for?
Internal Standard Abbreviation
International Standard Atmosphere
Internal Standard Atmosphere
International Space Agency
What is the composition of the lower atmosphere?
78% hydrogen, 21% oxygen, 1 % other gases
78% oxygen, 21% Hydrogen, 1% other gases
78% Nitrogen, 21% oxygen and 1% other gases
78% oxygen, 21 Nitrogen, 1% other gases
What is the standard pressure setting?
1010 hPa
1013 hPa
Local QNH
1000 hPa
The barometric pressure which indicates height above an aerodrome is called what?
QNS
QNH
QFH
QFE
The beautiful light called Aurora borealis is seen from earth but created where?
Stratosphere
Thermosphere
Tropopause
Troposphere
When isobars are close together on a pressure gradient map, what does this tell us?
The pressure gradient is high
The pressure gradient is low
A col is forming
The low pressure system in on the left
When QFE is selected, what is the level indicated on the altimeter called?
Height
Altitude
Pressure altitude
Flight Level
Which of the following are atmospheric layers?
Exosphere
Thermosphere
Troposphere
Mesosphere
Stratosphere
How does the height of the tropopause vary with latitude (in the northern hemisphere)?
The height normally increases from south to north
The height increases with higher longitude
It remains more or less constant with latitude
The height normally decreases from south to north
The higher you fly in the atmosphere, the lower the pressure gets.
True
False
Which atmospheric layer contains the most water vapour and weather?
Ionosphere
Thermosphere
Troposphere
Stratosphere
In the Stratosphere the temperature is stable up to
(a) kilometers then it increases.
Pressure in the atmosphere changes by a Rule of thumb stating 1 hPa is equal to?
45 feet
30 feet
25 feet
33 feet
In general air pressure and density decreases as altitude increases.
True
False
Density has an impact on aircraft performance.
False
True
Why is air pressure important to aviation?
If wrong setting - incorrect speed
If wrong setting - higher speed
If wrong setting - possibility to stall
If wrong setting - incorrect altitude
What is meant by the term latent heat?
Heat released or absorbed during conduction
Heat released or absorbed during radition
Heat released or absorbed during supercooling
Heat released or absorbed during the change of state of e.g. water
What is the relationship between density and temperature?
The higher the temperature, the higher the density
The lower the temperature the higher the density
There is no direct relationship between density and temperature
The lower the temperature, the lower the pressure
What is meant by supercooling?
When a water droplet remains liquid at below freezing temperatures
When water is cooled very quickly
When water freezes very quickly
When the water droplet is above freezing temperature, but the air is freezing
What is meant by conduction?
Heat transfer due to horizontal movement of air
Heat transfer between 2 objects that are in direct contact with each other
Heat transfer due to emission of electromagnetic waves
Heat transfer due to upwards currents of air
What is the transition from water vapour to liquid water called?
Condensation
Sublimation
Evaporation
Melting
What is meant by dew point temperature?
The temperature supercooling occur
The temperature at which air will be saturated
The temperature where relative humidity is 0%
The temperature where sublimation occur
What is meant by sublimation?
When vater vapour changes to liquid water
When ice changes to liquid water
When liquid water changes to water vapour
When ice changes directly to water vapour
What is a temperature inversion?
Temperature sinks according to the dry adiabatic lapse rate
Temperature rises with altitude
Temperature sinks by 3°C per 1000 FT
Temperature sinks with 1,98°C per 1000 FT
How is relative humidity affected by air temperature?
Cold air can hold more water vapour than warm air
Warm air can hold more water vapour than cold air
Cold air is more humid than warm air
Air can hold 1,225 g/m3 water regardless of temperature
What is the definition of adiabatic cooling or heating?
A temperature change of air due to convection and advection
A temperature change of air due to radiation
A temperature change of air due to the release of latent heat
A temperature change of air due to compression or expansion, and with no external heat transfer
What is the principle of adiabatic cooling?
Rising air cools because it becomes more moist
Rising air cools because it is cooled by the surrounding air
Rising air cools because it contracts
Rising air cools because it expands
What is the principle of convection?
Warm air is denser than cold air, and sinks down
Warm air is denser than cold air, and rises up
Warm air is moving horizontally and replaces cold air
Warm air is lighter than cold air, and rises up
When warm air rises and expands, the density of a given mass of air will be what?
Lower, because the gas contracts and decreases in volume
Higher, because the gas expands and increases in volume
Lower, because the gas expands and increases in volume
Higher, because the gas contracts and decreases in volume
Which of the following clouds are categorised as low clouds?
Stratus
Altostratus
Cirrocumulus
Cirrus
Which of these clouds are regarded as middle clouds?
Altocumulus
Cirrus
Cirrustratus
Cumulonimbus
Which of the following is categorised as Middle Clouds?
Cumulus
Nimbostratus
Altostratus
Cirrocumulus
What can lenticular clouds be an indication of?
Thunderstorms
Mountain waves
Jetstreams
Inversion layers
What is a layer of stratus clouds an indication of?
Stable air
Supercooled water droplets
Unstable air
A Jetstream
What is a towering cumulus cloud indicating?
Stable air
An approaching warm front
Unstable air
A Jetstream
How is a 2/8 (2 octas) cloud cover reported?
Scattered
Broken
Few
Overcast
How is a 4/8 (4 octas) cloud cover reported?
Overcast
Few
Broken
Scattered
What is the normal composition of high clouds?
Liquid water
Ice crystals
Supercooled water
Water vapour
What cloud type is most likely to produce freezing rain?
Cirrustratus
Cumulus
Lenticularis
Nimbostratus
Which clouds groups are normally regarded as high level clouds?
Nimbostratus
Altocumulus
Cirrus
Stratocumulus
Cloud ceiling means that (a)
or more of the sky is covered in clouds.
How are wind patterns in the northern hemisphere around a low pressure?
Directly from the high pressure
Clockwise
Counter-clockwise along the isobars
Direct from the north
How does the pressure gradient force in a pressure system affect wind speed?
The stronger the pressure gradient, the weaker the wind
It has no connection to windspeed, but direction will be altered clockwise
The stronger the pressure gradient, the stronger the wind
The stronger the pressure gradient, the wind speed is not changed due to friction
What is an occluded front?
When 2 warm fronts meet
When a cold front catches up to a warm front
When 2 cold fronts meet
When a warm front overtakes a cold front
What is a Föhn wind?
A dry, warm, down-slope wind that occurs in the downwind side of a mountain range
A dry wind flowing down a valley
A moist, warm, down-slope wind that occurs in the upwind side of a mountain range
A dry, cold, down-slope wind that occurs in the downwind side of a mountain range
What is a Jetstream?
Currents of air flowing out of a cumulonimbus cloud
Currents of fast flowing air close to the surface
Descending or ascending air in relation to a squall line
Currents of fast flowing air in the upper portions of the troposphere
In exactly what format is wind reported by ATC in a METAR?
The direction it is blowing towards and the wind speed.
The direction it is blowing from followed by the wind speed.
The direction it is blowing from followed by the wind speed if more than 5 knots.
The wind speed followed by the direction it is blowing from.
What are some characteristics of a maritime Polar air mass?
Warm and humid
Cold and humid
Warm and dry
Cold and dry
What is a sea breeze?
A wind during the night
A wind forming when 2 airmasses meet
A wind from the land to sea
A wind from the sea to land
What type of weather phenomena can be expected when a warm air mass is moving over a colder area?
Convective clouds
Showers and thunderstorms
Continuous precipitation and low cloud base
Showers and high cloud base
What is a sign of an approaching warm front?
A line of Cumulonimbus clouds
Steep frontal surface
Intense thunderstorms and squall lines
Gradually lowering cloud base
Where is the Jetstream core commonly formed?
In the warm air mass of a frontal system
In a thunderstorm
In arctic air
In the intertropical convergence zone
What is a sign of an approaching cold front?
Stratus clouds
Forced convection and showers
Fog and mist
Gradually lowering cloudbase
How does the friction layer close to the surface of the earth influence the wind?
It reduces pressure gradient force
It has no effect on the wind
It increases the wind speed
It changes direction and reduces speed
What are the typical characteristics of a continental tropical air mass?
Warm and humid
Cold and dry
Warm and dry
Cold and humid
What can be a hazard associated with a Jetstream?
Clear air turbulence
Supercooling
Icing
Electrical disturbances
What is a squall line?
A line of severe thunderstorms that can form along and/or ahead of a warm front
An occluded front
When an advancing cold air mass slides on top of a warmer, denser air mass
A line of thunderstorms that can form along and/or ahead of a cold front
A movement of cool, moist air over a warm surface is likely to cause?
Layered clouds
Fog and drizzle
Freezing rain
Convective clouds
A movement of warm, moist air over a cold surface is likely to cause?
Convective clouds
Unstable air with convection
Radiation fog
Layered clouds
What is the boundary between two air masses with different characteristics called?
an Inversion
a Convergence zone
a Cyclone
a Front
How does the Coriolis effect influence the wind?
It forces 2 opposing windpatterns to be pushed upwards
Wind direction will be deflected to the right in the northern hemisphere
It forces wind to travel directly from a high to a low pressure
It causes a frictional force and decreases the wind speed
With what type of cloud is DZ precipitation associated with?
CB
CU
ST
CC
In which situation is freezing rain most likely to occur?
Warm air over cold air, where the cold air is below freezing and the warmer is above freezing
A cold front with convective lifting
Cold air over warm air, where the cold air is below freezing and the warmer is above freezing
A shallow layer of air above freezing close to the ground while the air above is extremly cold
Precipitation in the form of showers occurs from what?
cirro-type clouds
clouds containing only ice crystals
stratified clouds
convective clouds
Which other weather phenomena can be associated with drizzle?
FG
VA
SH
TS
Under which conditions is radiation fog most likely to form?
At daytime, with no clouds and little wind
At night, with no clouds and strong winds
At night, with no clouds and little winds
At daytime, with no clouds and strong winds
What unit of measurement do we use in Meteorology for horizontal visibility?
NM
Km and meters
Km
Miles
When shall vertical visibility be reported?
If the cloud ceiling is below 1000 FT
Always
When the cloud height cannot be determined due to fog or precipitation
If visibility is below 1500m
What is haze?
Water vapour
Small ice crystals
Small dust particles
Small water droplets
What is true regarding advection fog?
Only occurs at night and early morning
May last for long periods
Is most likely with polar maritime air
Only occurs at night
What is the principle of advection fog?
Cold, moist air is moved over a warmer surface
The air is cooled by the ground that looses heat due to radiation
Moist air is forced upward by rising ground
Warm, moist air moved over a colder surface
When shall RVR be reported?
When there is more than 1500 m difference between visibility and RVR
When visibility or RVR is below 5000 m
When visibility or RVR is below 1500 m
When vertical visibility is reported
What does freezing fog consist of?
Snow flakes
Super cooled water droplets
Frozen water droplets
Ice pellets
What is the principle behind radiation fog?
Warm, moist air is moved over a cold surface
Moist air is forced upward by rising ground
Cold, moist air is moved over a warm surface
Fog caused by cooling of the earth's surface after sunset
Which of the following statements describe fog?
Solid particles reducing the visibility to between 1000 and 5000 meters
Solid particles reducing the visibility to below 1000 meters
Visible water droplets reducing the visibility to below 1000 meters
Visible water droplets reducing the visibility to between 1000 and 5000 meters
