Fluid Mechanics MCQs Set-1

Page 1 of 4

1.

A perfect fluid is

incompressible and frictionless

a real fluid

the one which obeys perfect gas laws

compressive and gaseous

2.

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

2σ/d

4σ/d

6σ/d

8σ/d

3.

Dynamic viscosity has the dimension as

ML^-2T^-2

L²T^-¹

ML^-¹T^-¹

ML^-2

4.

Equation of continuity is based on the principle of conservation of

momentum

none of these

mass

energy

5.

Which of the following is used to measure the discharge?

venturimeter

current meter

pitot tube

hotwire anemometer

6.

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

fluidity

viscosity

elasticity

relative density

7.

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

triangle

trapezoidal

semi-circle

rectangle

8.

Which one of the following is correct dimension of surface tension

W/m

N/m²

J/m

J/m²

9.

The eddy viscosity for turbulent flow is

independent of the flow

a physical property of the fluid

dependent on the flow

a function of temperature only

10.

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 ?

0.2520

0.0206

0.0311

0.0252

Page 2 of 4

11.

Surface tension is due to

the difference between cohesion and adhesion

adhesion

cohesion

viscous force

12.

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

is called

Perfect fluid

Bingham plastic

Newtonian fluid

Real fluid

13.

The losses are more in

transition flow

turbulent flow

critical flow

laminar flow

14.

Hot wire anemometer is used to measure

pressure intensity of gas

discharge

velocity of gas

pressure intensity of liquid

15.

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

translation

free vortex motion

circulation

Forced vortex motion

16.

Pseodo plastic is a fluid for which

dynamic viscosity decreases as the rate of shear increases

Newton's law of viscosity holds good

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

dynamic viscosity increases as the rate of shear increases

17.

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

dyne-s/cm^2

g-cm/s

dyne/cm^2

gs/cm

18.

The hydraulic grade line is

never above the energy grade line

all of these

always above the centre line of pipe

always sloping downward in the direction of flow

19.

The speed of a pressure wave through a pipe depends upon

the length of pipe

the bulk modulus for the fluid

the original head

the viscosity of fluid

20.

The pitot tube is used to measure

velocity at stagnation point

static pressure

dynamic pressure

stagnation pressure

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21.

An ideal fluid

is both incompressible and non-viscous

obey's the Newton's law of viscosity

satisfies the relation PV=RT

is non-viscous

22.

Hydraulic jump is a

i) steady flow

ii) uniform flow

iii) unsteady flow

iv) non-uniform flow

The correct answer is

(iii) and (iv)

(ii) and (iii)

(i) and (iv)

(i) and (ii)

23.

Capillary action is due to the

viscosity of liquid

adhesion of liquid particles on the surface

cohesion of liquid particles

surface tension

24.

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

minimum roughness coefficient

maximum area for a given flow

minimum wetted perimeter

least cost

25.

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

gravity and surface tension forces

gravity and pressure forces

viscous and surface tension forces

gravity and viscous forces

26.

The major loss of energy in long pipes is due to

sudden contraction

sudden enlargement

gradual contraction or enlargement

friction

27.

In a forced vortex motion, the velocity of flow is

inversely proportional to its radial distance from axis of rotation

directly proportional to its radial distance from axis of rotation

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

28.

Fluid statics deals with

Surface tension and gravity force

Viscous and pressure force

Viscous and gravity force

Gravity and pressure force

29.

In a Sutro weir, the discharge is proportional to

where H is Head.

H^3/2

H

H^1/2

H^5/2

30.

The hydraulic jump always occurs from

above critical depth to below critical depth

below critical depth to above critical depth

below critical depth to above normal depth

above normal depth to below normal depth

Page 4 of 4

31.

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

is never zero

can be zero

is always zero

is independent of coordinates

32.

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

directly proportional to the surface area

directly proportional to the specific weight of the fluid

inversely proportional to the surface tension

inversely proportional to the diameter

33.

The pressure rise due to water hammer depends upon

Time taken to close the valve

Length of pipe

Velocity of flow of water in pipe

All of these

34.

A real fluid is any fluid which

has constant viscosity and density

has viscosity

has surface tension and is compressible

has zero shear stress

35.

Coefficient of velocity of venturimeter

decreases with higher Reynolds number

none of these

is independent of Reynolds number

is equal to the coefficient of discharge of venturimeter

36.

What is the dimensions of kinematic viscosity of a fluid

L²T ^-¹

ML²T ^-¹

L¹T ^-¹

L²T ^-2

37.

Fluid is a substance which offers no resistance to change of

pressure

flow

volume

shape

38.

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

73 N/m^2

146 N/m^2

292 N/m^2

0.146 N/m^2

39.

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

same as

lower than

higher than

none of these

40.

The pressure at the summit of a syphon is

equal to atmospheric

none of these

more than atmospheric

less than atmospheric

Fluid Mechanics MCQs Set-1

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