This set of Engineering Hydrology Multiple Choice Questions & Answers (MCQs) focuses on “Snowfall and its Measurement”.
1. What is the density of freely falling snow?
a) 0.001
b) 0.002
c) 0.003
d) 0.004
View Answer
Explanation: Snow is a type of precipitation. Snow falls in the form of very light snowflakes. The density of snow is as less as 0.004.
2. What is the time up to which the snow is considered to be freshly fallen?
a) 8 hours
b) 12 hours
c) 24 hours
d) 30 hours
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Explanation: Snow is formed when moisture present in atmosphere gets solidified due to low temperature while it falls on the earth’s surface. Snow falls in the form of snowflakes which results in formation of layers of snow on the ground surface. Freshly fallen snow is considered to last up to 24 hours.
3. After snow gets deposited on the ground surface its density remains the same.
a) True
b) False
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Explanation: When snow reaches the ground surface, it gets deposited continuously, forming layers. These layers get compressed and therefore the density of snow increases. So, the density of snow changes continuously.
4. What is the density of freshly fallen snow?
a) 0.1
b) 0.2
c) 0.3
d) 0.4
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Explanation: When snow continuously get deposited on the ground surface, it forms layers. These layers get compressed and consolidated with increase in its density. Freshly fallen snow which lasts for 24 hours usually has a density of 0.1.
5. What is the density of heavy snow accumulations?
a) 0.1 to 0.3
b) 0.4 to 0.6
c) 0.5 to 0.8
d) 0.6 to 0.8
View Answer
Explanation: When snow falls on ground surface, its density changes due to compression and consolidation of layers of snow. For heavy snow accumulations, the density varies from 0.4 to 0.6.
6. When accumulated snow of high depth moves down a river valley like a flow in the stream, what is it called?
a) Iceberg
b) Snowflakes
c) Frozen cube
d) Glacier
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Explanation: An accumulated snow of sufficiently high depth in a river valley, moves down the valley like a flow in the stream then such accumulation of snow is known as glacier. Glacier has a depth of about 50 to 75 m.
7. What is the density of glacier?
a) 0.1
b) 0.4
c) 0.6
d) 0.9
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Explanation: A glacier is an accumulation of snow having sufficiently high depth and moves down a river valley. The density of a glacier is as high as 0.9. A glacier may cause severe floods in the river if by any chance it bursts.
8. Measurement of snowfall is divided into two categories. What are they?
a) Snow survey and snow gauging
b) Snow measurement and snow gauging
c) Snow measurement and snow survey
d) Snow survey and snow accumulations
View Answer
Explanation: The measurement of snowfall is dived into two categories. One is snowfall measurement and the other is snow survey. Snowfall measurement deals with measuring of snowfall on daily basis. Snow survey refers to measurement of snow in proper intervals.
9. Snow surveys are used to calculate the water equivalent of accumulated snow to find out runoff.
a) True
b) False
View Answer
Explanation: Snow surveys are used to measure the depth of accumulated snow for the entire winter season. It is also used to measure the density hence it helps to estimate the water equivalent of accumulated snow to calculate runoff.
10. What does snow gauging involve?
a) Measurement of depth of snow in open level platform
b) Measurement of depth of snow in shielded gauge vessel
c) Measurement of depth of snow in both open level platform and shielded gauge vessel
d) Measurement of depth of snow in wooden platform
View Answer
Explanation: Snow gauging is done in two ways. They are:
i. Measurement of depth of snow in open level platform
ii. Measurement of depth of snow in shielded gauge vessel. The depth of accumulated snow is measured after levelling the surface of snow without any compression.
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