Fluid Mechanics MCQs Set-1

Page 1 of 4

1.

The pressure at the summit of a syphon is

none of these

less than atmospheric

equal to atmospheric

more than atmospheric

2.

The hydraulic jump always occurs from

below critical depth to above critical depth

above critical depth to below critical depth

below critical depth to above normal depth

above normal depth to below normal depth

3.

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

is called

Perfect fluid

Real fluid

Bingham plastic

Newtonian fluid

4.

Dynamic viscosity has the dimension as

ML^-¹T^-¹

ML^-2T^-2

L²T^-¹

ML^-2

5.

Equation of continuity is based on the principle of conservation of

none of these

energy

momentum

mass

6.

A perfect fluid is

incompressible and frictionless

the one which obeys perfect gas laws

a real fluid

compressive and gaseous

7.

Which one of the following is correct dimension of surface tension

J/m²

N/m²

W/m

J/m

8.

The pitot tube is used to measure

stagnation pressure

static pressure

dynamic pressure

velocity at stagnation point

9.

Surface tension is due to

cohesion

adhesion

the difference between cohesion and adhesion

viscous force

10.

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 its radial distance from axis of rotation

inversely proportional to its radial distance from axis of rotation

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

Page 2 of 4

11.

The pressure rise due to water hammer depends upon

Length of pipe

All of these

Time taken to close the valve

Velocity of flow of water in pipe

12.

The major loss of energy in long pipes is due to

friction

sudden contraction

sudden enlargement

gradual contraction or enlargement

13.

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

maximum area for a given flow

minimum roughness coefficient

least cost

minimum wetted perimeter

14.

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 diameter

inversely proportional to the surface tension

15.

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

0.0252

0.2520

0.0311

16.

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

8σ/d

2σ/d

6σ/d

4σ/d

17.

An ideal fluid

is non-viscous

is both incompressible and non-viscous

satisfies the relation PV=RT

obey's the Newton's law of viscosity

18.

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

gravity and pressure forces

gravity and surface tension forces

gravity and viscous forces

viscous and surface tension forces

19.

Fluid is a substance which offers no resistance to change of

volume

flow

shape

pressure

20.

Pseodo plastic is a fluid for which

dynamic viscosity increases as the rate of shear increases

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

Page 3 of 4

21.

In a Sutro weir, the discharge is proportional to

where H is Head.

H^1/2

H^5/2

H^3/2

H

22.

The eddy viscosity for turbulent flow is

dependent on the flow

independent of the flow

a function of temperature only

a physical property of the fluid

23.

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

gs/cm

dyne-s/cm^2

g-cm/s

dyne/cm^2

24.

A real fluid is any fluid which

has surface tension and is compressible

has zero shear stress

has viscosity

has constant viscosity and density

25.

Fluid statics deals with

Viscous and gravity force

Gravity and pressure force

Surface tension and gravity force

Viscous and pressure force

26.

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

Forced vortex motion

free vortex motion

translation

circulation

27.

Hot wire anemometer is used to measure

discharge

pressure intensity of liquid

velocity of gas

pressure intensity of gas

28.

The losses are more in

critical flow

turbulent flow

laminar flow

transition flow

29.

Which of the following is used to measure the discharge?

venturimeter

current meter

hotwire anemometer

pitot tube

30.

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

semi-circle

trapezoidal

triangle

rectangle

Page 4 of 4

31.

What is the dimensions of kinematic viscosity of a fluid

ML²T ^-¹

L¹T ^-¹

L²T ^-2

L²T ^-¹

32.

Hydraulic jump is a

i) steady flow

ii) uniform flow

iii) unsteady flow

iv) non-uniform flow

The correct answer is

(i) and (ii)

(iii) and (iv)

(ii) and (iii)

(i) and (iv)

33.

Capillary action is due to the

cohesion of liquid particles

surface tension

adhesion of liquid particles on the surface

viscosity of liquid

34.

The speed of a pressure wave through a pipe depends upon

the viscosity of fluid

the length of pipe

the original head

the bulk modulus for the fluid

35.

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

same as

none of these

lower than

higher than

36.

Coefficient of velocity of venturimeter

is equal to the coefficient of discharge of venturimeter

is independent of Reynolds number

none of these

decreases with higher Reynolds number

37.

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

is always zero

is independent of coordinates

is never zero

can be zero

38.

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

39.

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

viscosity

elasticity

fluidity

relative density

40.

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

146 N/m^2

73 N/m^2

0.146 N/m^2

292 N/m^2

Fluid Mechanics MCQs Set-1

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