4-55.
In order for water vapor to condense and form
clouds, which of the following conditions is
NOT necessary?
1.
Sufficient moisture
2.
Hygroscopic or sublimation nuclei
3.
Turbulent air currents
4.
A cooling process
4-56.
Why are hygroscopic and sublimation nuclei
so important in the cloud formation process?
1.
They determine the type of cloud that will
form
2.
Cloud formation is all but impossible
without them
3.
They trigger the precipitation process
4.
All of the above
4-57.
What clouds are believed to be the result of
direct sublimation?
1.
Cirriform
2.
Stratiform
3.
Cumuliform
4.
Nacreous
4-58.
What are the upper limits of cirriform clouds
(based on etage classification) in the tropics,
middle latitudes, and polar regions?
1.
80,000, 45,000, and 25,000 feet
2.
60,000, 45,000, and 25,000 feet
3.
60,000, 30,000, and 16,600 feet
4.
20,000, 16,500, and 10,000 feet
4-59.
Which of the following clouds is classified as
belonging to one etage but may extend into
other etages?
1.
Altocumulus
2.
Altostratus
3.
Nimbostratus
4.
Stratus
4-60.
The cloud species castellanus applies mainly to
which of the following cloud genera?
1.
Cumulus
2.
Stratus
3.
Altocumulus
4.
Cirrus
4-61.
A cumulonimbus cloud that produces hanging
pouchlike protuberances is known as
1.
tuba
2.
castellanus
3.
mammatus
4.
congestus
4-62.
Elongated cloud masses in the shape of lenses
or almonds are classified as
1.
humilis
2.
stratiformis
3.
fractus
4.
lenticularis
4-63.
The fair weather cumulus clouds of the tropics
have little vertical extent and are classified as
1.
humilis
2.
mediocris
3.
fractus
4.
castellanus
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