Fluid Mechanics MCQs Set-1

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1.

The major loss of energy in long pipes is due to

gradual contraction or enlargement

sudden enlargement

friction

sudden contraction

2.

An ideal fluid

is both incompressible and non-viscous

satisfies the relation PV=RT

obey's the Newton's law of viscosity

is non-viscous

3.

Hydraulic jump is a

i) steady flow

ii) uniform flow

iii) unsteady flow

iv) non-uniform flow

The correct answer is

(i) and (iv)

(ii) and (iii)

(iii) and (iv)

(i) and (ii)

4.

The pressure at the summit of a syphon is

equal to atmospheric

more than atmospheric

less than atmospheric

none of these

5.

The hydraulic jump always occurs from

above critical depth to below critical depth

below critical depth to above normal depth

above normal depth to below normal depth

below critical depth to above critical depth

6.

The best hydraulic channel cross-section is the one which has a

least cost

minimum roughness coefficient

minimum wetted perimeter

maximum area for a given flow

7.

If the surface tension of water air interface is 0.073 N/m, the gauge pressure inside a rain drop of 1 mm diameter will be

0.146 N/m^2

292 N/m^2

146 N/m^2

73 N/m^2

8.

What is the unit of dynamic viscosity of a fluid termed 'poise' equivalent to?

g-cm/s

gs/cm

dyne-s/cm^2

dyne/cm^2

9.

The pitot tube is used to measure

stagnation pressure

velocity at stagnation point

static pressure

dynamic pressure

10.

Equation of continuity is based on the principle of conservation of

energy

none of these

mass

momentum

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11.

Dynamic viscosity has the dimension as

ML^-2T^-2

L²T^-¹

ML^-2

ML^-¹T^-¹

12.

The losses are more in

turbulent flow

laminar flow

critical flow

transition flow

13.

Coefficient of velocity of venturimeter

none of these

decreases with higher Reynolds number

is independent of Reynolds number

is equal to the coefficient of discharge of venturimeter

14.

In a forced vortex motion, the velocity of flow is

inversely proportional to the square of its radial distance from the axis of rotation

directly proportional to the square of its radial distance from the axis of rotation

directly proportional to its radial distance from axis of rotation

inversely proportional to its radial distance from axis of rotation

15.

Which of the following is used to measure the discharge?

venturimeter

pitot tube

hotwire anemometer

current meter

16.

An oil of specific gravity 0.9 has viscosity of 0.28 stoke at 38 degree C. What will be its viscosity in N-s/m^2 ?

0.0311

0.0252

0.2520

0.0206

17.

Which one of the following is correct dimension of surface tension

W/m

J/m

N/m²

J/m²

18.

The pressure rise due to water hammer depends upon

Time taken to close the valve

Velocity of flow of water in pipe

All of these

Length of pipe

19.

The difference of pressure between the inside and outside the soap bubble is

2σ/d

4σ/d

8σ/d

6σ/d

20.

The speed of a pressure wave through a pipe depends upon

the viscosity of fluid

the length of pipe

the bulk modulus for the fluid

the original head

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21.

A liquid undergoing a rigid body rotation in a container is said to have

free vortex motion

translation

circulation

Forced vortex motion

22.

The eddy viscosity for turbulent flow is

independent of the flow

a physical property of the fluid

a function of temperature only

dependent on the flow

23.

Fluid is a substance which offers no resistance to change of

shape

pressure

volume

flow

24.

Which one of the following is correct? the capillary rise on depression in a small diameter tube is

directly proportional to the specific weight of the fluid

inversely proportional to the surface tension

directly proportional to the surface area

inversely proportional to the diameter

25.

Hot wire anemometer is used to measure

discharge

velocity of gas

pressure intensity of liquid

pressure intensity of gas

26.

A perfect fluid is

compressive and gaseous

the one which obeys perfect gas laws

incompressible and frictionless

a real fluid

27.

Surface tension is due to

adhesion

viscous force

the difference between cohesion and adhesion

cohesion

28.

What is the dimensions of kinematic viscosity of a fluid

ML²T ^-¹

L²T ^-¹

L²T ^-2

L¹T ^-¹

29.

The property, which characterizes the resistance which a fluid offers to applied shear force is called as

viscosity

elasticity

relative density

fluidity

30.

Fluid statics deals with

Surface tension and gravity force

Viscous and gravity force

Viscous and pressure force

Gravity and pressure force

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31.

The surface tension of mercury at normal temperature is ____________ that of water.

higher than

none of these

lower than

same as

32.

Pseodo plastic is a fluid for which

Newton's law of viscosity holds good

dynamic viscosity increases as the rate of shear increases

dynamic viscosity decreases as the rate of shear increases

dynamic viscosity increases with the time for which shearing forces are applied

33.

The fluid which obey's the Newton's law of viscosity

is called

Bingham plastic

Perfect fluid

Newtonian fluid

Real fluid

34.

What are the forces that influence the problem of fluid statics?

gravity and viscous forces

gravity and surface tension forces

gravity and pressure forces

viscous and surface tension forces

35.

In steady flow of a fluid, the total acceleration of any fluid particle

is always zero

is never zero

can be zero

is independent of coordinates

36.

A real fluid is any fluid which

has viscosity

has zero shear stress

has constant viscosity and density

has surface tension and is compressible

37.

Which is the best hydraulic section of the following open channel cross-sections?

trapezoidal

semi-circle

rectangle

triangle

38.

Capillary action is due to the

viscosity of liquid

adhesion of liquid particles on the surface

cohesion of liquid particles

surface tension

39.

In a Sutro weir, the discharge is proportional to

where H is Head.

H^1/2

H

H^5/2

H^3/2

40.

The hydraulic grade line is

always above the centre line of pipe

always sloping downward in the direction of flow

all of these

never above the energy grade line

Fluid Mechanics MCQs Set-1

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