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Fluid Mechanics MCQ Question with Answer

Fluid Mechanics MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

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Question No : 22
An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.

Equal to
Directly proportional
Inversely proportional
None of these

Question No : 23
The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number)

1/RN
4/RN
16/RN
64/RN

Question No : 24
A streamline is defined as the line

Parallel to central axis flow
Parallel to outer surface of pipe
Of equal velocity in a flow
Along which the pressure drop is uniform

Question No : 25
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by

dQ/Q = (1/2) × (dH/H)
dQ/Q = (3/4) × (dH/H)
dQ/Q = (dH/H)
dQ/Q = (3/2) × (dH/H)

Question No : 26
When the Venturimeter is inclined, then for a given flow it will show __________ reading.

Same
More
Less
None of these

Question No : 27
The tendency of a liquid surface to contract is due to the following property

Cohesion
Adhesion
Viscosity
Surface tension

Question No : 28
When a body is placed over a liquid, it will sink down if

Gravitational force is equal to the up-thrust of the liquid
Gravitational force is less than the up-thrust of the liquid
Gravitational force is more than the up-thrust of the liquid
None of the above

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