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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 : 36
The flow in a pipe is turbulent when Reynold number is

Less than 2000
Between 2000 and 2800
More than 2800
None of these

Question No : 37
Which of the following instruments is used to measure flow on the application of Bernoulli's theorem?

Venturimeter
Orifice plate
Nozzle
All of the above

Question No : 38
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is

(v₁ - v₂)²/g
(v₁² - v₂²)/g
(v₁ - v₂)²/2g
(v₁² - v₂²)/2g

Question No : 39
Bulk modulus of a fluid __________ as the pressure increases.

Remain same
Decreases
Increases
None of these

Question No : 40
The unit of kinematic viscosity in S. I. units is

N-m/s
N-s/m2
m2/s
N-m

Question No : 41
The Newton's law of resistance is based on the assumption that the

Planes of the body are completely smooth
Space around the body is completely filled with the fluid
Fluid particles do not exert any influence on one another
All of the above

Question No : 42
The top of the weir over which the water flows is known as

Sill or crest
Nappe or vein
Orifice
None of these

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