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Question

Water flows through a cylindrical pipe of internal diameter 7cm at 5 metre per second. Calculate the volume, in litres, of water discharged by the pipe in one minute,

A
1255
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B
1155
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C
1145
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D
none of the above
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Solution

The correct option is C 1155
cylindrical pipe of internal diameter =7cm
radius=3.5cm
In 1 second Water flows 5 metre.
So, in 60 second Water flows 5*60=300 metre.
So volume of cylindrical pipe
V=πr2h
V=22/73.53.530000
V=1155000cm3
and 1000cm3=1litre
So, V=1155litre

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