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1) Drizzle occurs from
a) CS
b) ST
c) NS
d) CU
Explanation: Drizzle typically occurs from stratus (ST) clouds.
2) Altostratus (AS) is
a) Low cloud of sheet type
b) A medium cloud of sheet type
c) A cloud of large vertical growth
d) A high cloud of sheet type
Explanation: Altostratus (AS) is a medium-level cloud of sheet type.
3) Showers occur from
a) CU
b) CB
c) AS
d) AC
Explanation: Showers occur from cumulonimbus (CB) clouds.
4) Heavy icing is possible in
a) CI
b) CS
c) ST
d) CB
Explanation: Heavy icing is most likely to occur in (cb) clouds.
5) To avoid icing in cloudy conditions, a pilot is advised to fly through a cloud which shows an optical phenomenon
a) Halo
b) Corona
c) With multi-coloured clouds
Explanation: To avoid icing, pilots are advised to avoid clouds showing a halo, as it may indicate ice crystals.
6) Dark gray cloud giving continuous rain is called
a) AS
b) NS
c) ST
d) CB
Explanation: Nimbostratus (NS) clouds are dark gray and give continuous rain.
7) A uniform layer of cloud resembling fog but not on the ground
a) AS
b) NS
c) ST
Explanation: Stratus (ST) clouds form a uniform layer and can resemble fog but are not on the ground.
8) The clouds composed of ice crystals having a feathery appearance
a) CI
b) CS
c) AS
Explanation: Cirrus (CI) clouds are composed of ice crystals and have a feathery appearance.
9) Halo is associated with the cloud
a) AC
b) AS
c) CS
d) CI
Explanation: A halo is associated with cirro stratus (CS) clouds due to the refraction of light through ice crystals.
10) NS clouds occur
a) At cold front
b) At warm front
c) At both cold and warm fronts
Explanation: Nimbostratus (NS) clouds are commonly associated with warm fronts.
11) Corona is associated with the cloud
a) AS
b) AC
c) CC
d) CS
Explanation: A corona is associated with ALTO STRATUS(AS) clouds and is caused by diffraction of light around cloud droplets.
12) Lenticular clouds indicate presence of
a) Warm Front
b) Cold Front
c) Mountain waves
Explanation: Lenticular clouds often indicate the presence of mountain waves due to orographic lift.
13) The lowest level below which condensation trails will not form is
a) Mintra Level
b) Drytra Level
c) Maxtra Level
Explanation: Condensation trails will not form below the Mintra Level, where the temperature and humidity conditions are not suitable.
14) Rain falling from cloud but not reaching ground is
a) Virgo
b) Virga
c) Mirage
Explanation: Virga is rain that falls from a cloud but evaporates before reaching the ground.
15) CB with distinct anvil is called
a) Castellanus
b) Capillatus
c) Uncinus
Explanation: A cumulonimbus (CB) cloud with a distinct anvil is referred to as Capillatus.
16) Cloud ceiling is the height of the cloud covering
a) 3-4/8
b) 8/8
c) 5/8 or more
Explanation: Cloud ceiling is measured by the height of the cloud cover that is 5/8 or more of the sky.
17) No condensation trails occur above
a) Maxtra Level
b) Drytra Level
c) Mintra Level
Explanation: Condensation trails do not form above the Maxtra Level due to insufficient atmospheric moisture and temperature conditions.
18) Cloud of operational significance has base below ……. m or below the highest minimum sector altitude, which is greater
a) 1500
b) 2000
c) 1000
Explanation: Clouds of operational significance have bases below 1500 meters or below the highest minimum sector altitude, whichever is greater.
19) AC cloud with cumuliform protuberances are indicative of
a) Stability
b) Instability
c) Neutrality
Explanation: Altocumulus (AC) clouds with cumuliform protuberances indicate atmospheric instability.
20) Hail may be experienced under the anvil of a CB
a) True
b) False
Explanation: Hail is commonly experienced under the anvil of a cumulonimbus (CB) cloud due to strong updrafts and turbulence.

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