Fluid Mechanics Mcqs

Practice Quiz On Fluid Mechanics Mcqs

30 Marks

1 / 30

The flow in a pipe or channel is said to be uniform when

2 / 30

A flow is called hyper-sonic, if the Mach number is

3 / 30

The total energy line lies over the hydraulic gradient line by an amount equal to the

4 / 30

Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called

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A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the

6 / 30

The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called

7 / 30

The hydraulic mean depth or the hydraulic radius is the ratio of

8 / 30

An impulse turbine is used for

9 / 30

A point, in a compressible flow where the velocity of fluid is zero, is called

10 / 30

The coefficient of discharge for an external mouthpiece depends upon

11 / 30

Reynold's number is the ratio of the inertia force to the

12 / 30

When a body is placed over a liquid, it will sink down if

13 / 30

Density of water is maximum at

14 / 30

All the terms of energy in Bernoulli's equation have dimension of

15 / 30

An average value of coefficient of velocity is

16 / 30

In a venturi-flume, the flow takes place at

17 / 30

The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as

18 / 30

Unit of surface tension is

19 / 30

The absolute pressure is equal to

20 / 30

The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as

21 / 30

Hot wire anemometer is used to measure

22 / 30

The centre of gravity of the volume of the liquid displaced is called

23 / 30

Gradually varied flow is

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In an immersed body, centre of pressure is

25 / 30

Piezometer is used to measure

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In a reciprocating pump, air vessels are used to

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The variation in the volume of a liquid with the variation of pressure is called its

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The meatcentric height is the distance between the

29 / 30

The velocity at which the laminar flow stops, is known as

30 / 30

The flow in which each liquid particle has a definite path and their paths do not cross each other is called

Your score is

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The centre of gravity of the volume of the liquid displaced is called

A) Centre of pressure

B) Centre of buoyancy

C) Metacentre

D) None of these

B) Centre of buoyancy


In a reciprocating pump, air vessels are used to

A) Smoothen the flow

B) Reduce suction head

C) Increase delivery head

D) Reduce acceleration head

D) Reduce acceleration head


The absolute pressure is equal to

A) Gauge pressure + atmospheric pressure

B) Gauge pressure – atmospheric pressure

C) Atmospheric pressure – gauge pressure

D) Gauge pressure – vacuum pressure

A) Gauge pressure + atmospheric pressure


The velocity at which the laminar flow stops, is known as

A) Velocity of approach

B) Lower critical velocity

C) Higher critical velocity

D) None of these

B) Lower critical velocity


The variation in the volume of a liquid with the variation of pressure is called its

A) Surface tension

B) Compressibility

C) Capillarity

D) Viscosity

B) Compressibility


Unit of surface tension is

A) Energy/unit area

B) Velocity/unit area

C) Both of the above

D) None of the above

A) Energy/unit area


When a body is placed over a liquid, it will sink down if

A) Gravitational force is equal to the up-thrust of the liquid

B) Gravitational force is less than the up-thrust of the liquid

C) Gravitational force is more than the up-thrust of the liquid

D) None of the above

C) Gravitational force is more than the up-thrust of the liquid


Density of water is maximum at

A) 0° C

B) 0° K

C) 4° C

D) 100° C

C) 4° C


The meatcentric height is the distance between the

A) Centre of gravity of the floating body and the centre of buoyancy

B) Centre of gravity of the floating body and the metacentre

C) Metacentre and centre of buoyancy

D) Original centre of buoyancy and new centre of buoyancy

B) Centre of gravity of the floating body and the metacentre


The total energy line lies over the hydraulic gradient line by an amount equal to the

A) Pressure head

B) Velocity head

C) Pressure head + velocity head

D) Pressure head – velocity head

B) Velocity head


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