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Worksheets08 Clouds
Total questions: 35
Worksheet time: 3hrs 55mins
What is the most common process by which cloud is formed?
Adiabatic cooling of rising air
Cooling of air by conduction at the earth’s surface
Cooling of air when it is transported over cold surfaces
Mixing of moist air with colder drier air
In mid-latitudes, what is the range of cloud base height above the Earth’s surface which will classify clouds as ‘middle cloud’?
Below 6,500 ft
Between 6,500 ft to 23,000ft ft
Between 4,500 ft to 23,000 ft
Between 10, 000 to 25, 000 ft
What type of cloud is the most likely to form if moist air is cooled adiabatically in an area with an ELR of 1°/1000’?
Cumuliform
Cumulonimbus
Stratiform
Orographic
What flight conditions will be most likely encountered when a pilot flies towards a layer of convective clouds?
Smooth flying and reduced visibility beneath the base
Smooth flying in the cloud
Good visibility above the cloud and turbulent conditions below
Turbulence above the cloud with poor visibility below the base
Which of the following words describes rain-bearing clouds?
Cirrus
Cumulus
Nimbus
Stratus
What are the two main classifications of clouds?
Cirroform and Cumuliform
Stratiform and Cumuliform
Nimbus and Layered
Alto and Cumuliform
Which form of lifting is most likely to result in the formation of Nimbostratus (Ns) cloud?
Orographic lifting on the windward side of mountain ranges
Mechanical turbulence from surface friction
Frontal lifting and/or widespread ascent of air
Convection from surface heating
What is the most likely process by which cloud forms on windy mornings?
Convergence
Orographic ascent
Slow widespread ascent
Turbulence or small-scale mechanical rising
Select the appropriate set of words from the A to D list below that when added to the end of this text and make a true statement:
"A contrail is a cloud made of ice crystals that is formed by moisture supplied to the atmosphere by …"
Turbulence mixing in the upper atmosphere
Jet aircraft engine exhaust gases
Jet stream wind
Products produced in Cb anvil heads
What are Cirriform cloud mainly composed of?
Ice crystals
Mixture of water droplets and Ice Crystals
Super-cooled water droplets
Water droplets
Cloud amount is reported in layers and the amount of sky covered is called an OKTA. “FEW” is the abbreviation used to report 1-2 OKTA of cloud. What are the other cloud cover abbreviations? (Select all that apply)
‘Scattered’ (SCT)
‘Broken’ (BKN)
'Bent' (BNT)
'Oktacast' (OKT)
‘Overcast’ (OVC)
What type of precipitation is normally associated with thin As cloud?
Nil
Rain Showers (SHRA)
Light Rain (-RA)
Heavy Showers (+SH)
Which of the following types of lifting is most frequently associated with the formation of cumuliform cloud?
Convection
Convergence
Mechanical turbulence
Subsidence
Which of the listed cloud is most likely to produce snow?
Cirrostratus (Cs)
Cumulus (Cu)
Nimbostratus (Ns)
Stratocumulus (Sc)
What type of precipitation is associated with thick Altocumulus (Ac) cloud?
Generally, there is no precipitation of any significance
Heavy RA
Light RA
SHRA
Which of the 3 cloud classifications (High, Middle, Low) are Towering Cumulus (TCU) and Cumulonimbus (CB) classified as?
Both Low and Medium level clouds
High-level clouds
Low-level cloud
Medium-level clouds
What type of frontal system does high level, Circus (Ci) cloud indicates is approaching?
Cold front
None - It is not a precursor of an approaching frontal system
Warm front
Is the following text a TRUE or FALSE statement?
"Cloud development depends on a number of factors. Humidity, in combination with a drop in temperature, is needed for condensation to take place, and a trigger action of some kind is required to initiate this process"
TRUE
FALSE
Is the following text a TRUE or FALSE statement?
"Cirrus, cirrocumulus, and cirrostratus clouds are all classed as middle clouds"
TRUE
FALSE
Temperature = 14°C
Dew point = 6°C
What height will LCL cloud form?
3200 ft
2720 ft
3720 ft
2200 ft
Select all of the following that are ‘triggers’ by which a parcel of air may be lifted to form cloud?
Convective rising through heating
Orographic rising (Large scale)
Mechanical rising (Small scale)
Frontal lifting
Lifting through surface convergence and high level divergence
Which of the following abbreviation is used in a METAR to code a cloud layer that completely covers the sky (eight eighths of the sky is covered by cloud)?
BKN
CAVOK
FEW
OVC
SCT
Which one of the following cloud types can stretch vertically across all 3 (three) cloud level classifications?
Altocumulus
Cumulonimbus
Nimbostratus
Stratus
Select the TRUE statement
When super-saturation occurs, the relative humidity is HIGHER than 100% and the condensation process is ENHANCED
When super-saturation occurs, the relative humidity is HIGHER than 100% and the condensation process is DELAYED
When super-saturation occurs, the relative humidity is LOWER than 100% and the condensation process is ENHANCED
When super-saturation occurs, the relative humidity is LOWER than 100% and the condensation process is DELAYED
TRUE or FALSE?
"The water content of cloud is generally lower in summer than in winter"
TRUE
FALSE
TRUE or FALSE?
"When the temperature at the cloud base is high, the water content of cloud will be high"
TRUE
FALSE
Select the TRUE statement
Altostratus cloud CAN be very extensive in depth and icing within the cloud IS normally light
Altostratus cloud CANNOT be very extensive in depth and icing within the cloud IS normally light
Altostratus cloud CAN be very extensive in depth and icing within the cloud IS Not normally a problem
Altostratus cloud CANNOT be very extensive in depth and icing within the cloud IS NOT normally a problem
Select the TRUE statement
Stratus cloud is usually a THIN SHALLOW layer-type cloud which is often associated with DRIZZLE
Stratus cloud is usually a THIN SHALLOW layer-type cloud which is often associated with RAIN
Stratus cloud is usually a THICK layer-type cloud which is often associated with DRIZZLE
Stratus cloud is usually a THICK layer-type cloud which is often associated with RAIN
Select the TRUE statements
The most common process of cloud dispersal is through adiabatic COOLING of the air through SUBSIDENCE
The most common process of cloud dispersal is through adiabatic WARMING of the air through SUBSIDENCE
The most common process of cloud dispersal is through adiabatic COOLING of the air through ASCENT
The most common process of cloud dispersal is through adiabatic COOLING of the air through ASCENT
What cloud is this a picture of?
Rotor streaming cloud
Mammatus cloud
Kelvin Helmholtz cloud
Asperitas cloud
What cloud is this a picture of?
Towering Cumulus (Tcu)
Cumulonimbus (Cb)
Pyrocumulus
Mammatus cloud
Kelvin Helmholtz wave cloud
What cloud is this a picture of?
Cirrus (Ci)
Cirrostratus (Cs)
Altocirrus (Ac)
Cirrocumulus (Cc)
Temperature = 20°C
Dew point = 5°C
What height will CCL cloud form?
6,000 ft
5,100 ft
4,000 ft
5,100 ft
What type of cloud is this?
Asperitas
Kelvin Helmholtz
Banner cloud
Cumulonimbus
Temperature = 22°C
Dew point = 8°C
What height will LCL cloud form?
4420ft
4500ft
4760ft
4670ft
