Fluid Mechanics MCQs Set-1

Page 1 of 4

1.

Fluid is a substance which offers no resistance to change of

volume

shape

flow

pressure

2.

The pressure at the summit of a syphon is

none of these

equal to atmospheric

less than atmospheric

more than atmospheric

3.

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

is called

Bingham plastic

Perfect fluid

Newtonian fluid

Real fluid

4.

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

0.146 N/m^2

292 N/m^2

146 N/m^2

5.

The pressure rise due to water hammer depends upon

Velocity of flow of water in pipe

Length of pipe

All of these

Time taken to close the valve

6.

The hydraulic jump always occurs from

above normal depth to below normal depth

below critical depth to above normal depth

above critical depth to below critical depth

below critical depth to above critical depth

7.

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

0.2520

0.0252

0.0206

8.

Which of the following is used to measure the discharge?

current meter

hotwire anemometer

pitot tube

venturimeter

9.

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

viscosity

relative density

elasticity

fluidity

10.

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

gs/cm

g-cm/s

dyne-s/cm^2

dyne/cm^2

Page 2 of 4

11.

Capillary action is due to the

adhesion of liquid particles on the surface

surface tension

viscosity of liquid

cohesion of liquid particles

12.

The losses are more in

turbulent flow

critical flow

transition flow

laminar flow

13.

In a Sutro weir, the discharge is proportional to

where H is Head.

H^5/2

H^3/2

H

H^1/2

14.

Equation of continuity is based on the principle of conservation of

energy

none of these

mass

momentum

15.

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

triangle

rectangle

trapezoidal

semi-circle

16.

A real fluid is any fluid which

has viscosity

has constant viscosity and density

has zero shear stress

has surface tension and is compressible

17.

The major loss of energy in long pipes is due to

friction

sudden enlargement

gradual contraction or enlargement

sudden contraction

18.

In a forced vortex motion, the velocity of flow is

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

inversely proportional to its radial distance from axis of rotation

directly proportional to its radial distance from axis of rotation

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

19.

The eddy viscosity for turbulent flow is

a physical property of the fluid

a function of temperature only

dependent on the flow

independent of the flow

20.

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

Page 3 of 4

21.

Pseodo plastic is a fluid for which

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

dynamic viscosity decreases as the rate of shear increases

Newton's law of viscosity holds good

dynamic viscosity increases as the rate of shear increases

22.

Dynamic viscosity has the dimension as

ML^-2

ML^-2T^-2

ML^-¹T^-¹

L²T^-¹

23.

A perfect fluid is

the one which obeys perfect gas laws

compressive and gaseous

a real fluid

incompressible and frictionless

24.

Fluid statics deals with

Gravity and pressure force

Viscous and pressure force

Surface tension and gravity force

Viscous and gravity force

25.

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

minimum roughness coefficient

least cost

minimum wetted perimeter

maximum area for a given flow

26.

Hydraulic jump is a

i) steady flow

ii) uniform flow

iii) unsteady flow

iv) non-uniform flow

The correct answer is

(i) and (ii)

(i) and (iv)

(iii) and (iv)

(ii) and (iii)

27.

The pitot tube is used to measure

stagnation pressure

dynamic pressure

static pressure

velocity at stagnation point

28.

Coefficient of velocity of venturimeter

is independent of Reynolds number

decreases with higher Reynolds number

is equal to the coefficient of discharge of venturimeter

none of these

29.

What is the dimensions of kinematic viscosity of a fluid

L¹T ^-¹

ML²T ^-¹

L²T ^-2

L²T ^-¹

30.

An ideal fluid

is both incompressible and non-viscous

is non-viscous

satisfies the relation PV=RT

obey's the Newton's law of viscosity

Page 4 of 4

31.

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

gravity and pressure forces

gravity and surface tension forces

viscous and surface tension forces

gravity and viscous forces

32.

The hydraulic grade line is

all of these

always sloping downward in the direction of flow

always above the centre line of pipe

never above the energy grade line

33.

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

2σ/d

4σ/d

8σ/d

6σ/d

34.

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

none of these

lower than

same as

higher than

35.

Which one of the following is correct dimension of surface tension

J/m²

W/m

N/m²

J/m

36.

Surface tension is due to

the difference between cohesion and adhesion

viscous force

adhesion

cohesion

37.

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

can be zero

is always zero

is never zero

is independent of coordinates

38.

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 diameter

directly proportional to the surface area

inversely proportional to the surface tension

39.

Hot wire anemometer is used to measure

discharge

pressure intensity of gas

velocity of gas

pressure intensity of liquid

40.

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

translation

circulation

Forced vortex motion

free vortex motion

Fluid Mechanics MCQs Set-1

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