Fluid Mechanics MCQs Set-1

Page 1 of 4

1.

The speed of a pressure wave through a pipe depends upon

the original head

the bulk modulus for the fluid

the viscosity of fluid

the length of pipe

2.

Equation of continuity is based on the principle of conservation of

none of these

energy

momentum

mass

3.

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

292 N/m^2

146 N/m^2

73 N/m^2

0.146 N/m^2

4.

The pressure at the summit of a syphon is

equal to atmospheric

less than atmospheric

more than atmospheric

none of these

5.

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

higher than

none of these

lower than

same as

6.

Dynamic viscosity has the dimension as

ML^-2T^-2

ML^-2

L²T^-¹

ML^-¹T^-¹

7.

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

semi-circle

triangle

trapezoidal

rectangle

8.

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

8σ/d

2σ/d

4σ/d

6σ/d

9.

The losses are more in

turbulent flow

critical flow

transition flow

laminar flow

10.

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

Page 2 of 4

11.

Fluid is a substance which offers no resistance to change of

pressure

flow

volume

shape

12.

In a forced vortex motion, the velocity of flow is

directly proportional to its radial distance from axis of rotation

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

inversely proportional to its radial distance from axis of rotation

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

13.

In a Sutro weir, the discharge is proportional to

where H is Head.

H^5/2

H^1/2

H^3/2

H

14.

Fluid statics deals with

Surface tension and gravity force

Gravity and pressure force

Viscous and pressure force

Viscous and gravity force

15.

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

16.

Pseodo plastic is a fluid for which

dynamic viscosity increases as the rate of shear increases

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

17.

Coefficient of velocity of venturimeter

is equal to the coefficient of discharge of venturimeter

decreases with higher Reynolds number

is independent of Reynolds number

none of these

18.

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

elasticity

viscosity

relative density

fluidity

19.

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

minimum wetted perimeter

minimum roughness coefficient

maximum area for a given flow

least cost

20.

The hydraulic jump always occurs from

above normal depth to below normal depth

below critical depth to above critical depth

below critical depth to above normal depth

above critical depth to below critical depth

Page 3 of 4

21.

The pitot tube is used to measure

dynamic pressure

static pressure

velocity at stagnation point

stagnation pressure

22.

Which one of the following is correct dimension of surface tension

N/m²

J/m²

J/m

W/m

23.

The pressure rise due to water hammer depends upon

Time taken to close the valve

Velocity of flow of water in pipe

Length of pipe

All of these

24.

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

is called

Bingham plastic

Real fluid

Newtonian fluid

Perfect fluid

25.

Capillary action is due to the

cohesion of liquid particles

adhesion of liquid particles on the surface

viscosity of liquid

surface tension

26.

A real fluid is any fluid which

has zero shear stress

has surface tension and is compressible

has viscosity

has constant viscosity and density

27.

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

translation

free vortex motion

circulation

Forced vortex motion

28.

A perfect fluid is

compressive and gaseous

the one which obeys perfect gas laws

a real fluid

incompressible and frictionless

29.

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

is independent of coordinates

is never zero

is always zero

can be zero

30.

Hot wire anemometer is used to measure

pressure intensity of liquid

discharge

velocity of gas

pressure intensity of gas

Page 4 of 4

31.

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

gs/cm

dyne/cm^2

g-cm/s

dyne-s/cm^2

32.

The hydraulic grade line is

all of these

never above the energy grade line

always sloping downward in the direction of flow

always above the centre line of pipe

33.

Hydraulic jump is a

i) steady flow

ii) uniform flow

iii) unsteady flow

iv) non-uniform flow

The correct answer is

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

(i) and (iv)

34.

Which of the following is used to measure the discharge?

pitot tube

venturimeter

hotwire anemometer

current meter

35.

Surface tension is due to

cohesion

viscous force

adhesion

the difference between cohesion and adhesion

36.

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 ?

0.0206

0.2520

0.0252

0.0311

37.

The eddy viscosity for turbulent flow is

a physical property of the fluid

dependent on the flow

a function of temperature only

independent of the flow

38.

An ideal fluid

obey's the Newton's law of viscosity

is both incompressible and non-viscous

satisfies the relation PV=RT

is non-viscous

39.

What is the dimensions of kinematic viscosity of a fluid

L²T ^-2

ML²T ^-¹

L¹T ^-¹

L²T ^-¹

40.

The major loss of energy in long pipes is due to

friction

sudden contraction

sudden enlargement

gradual contraction or enlargement

Fluid Mechanics MCQs Set-1

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