Fluid Mechanics MCQs Set-1

Page 1 of 4

1.

The pressure at the summit of a syphon is

more than atmospheric

none of these

less than atmospheric

equal to atmospheric

2.

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

none of these

lower than

higher than

same as

3.

Hot wire anemometer is used to measure

pressure intensity of liquid

velocity of gas

pressure intensity of gas

discharge

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.

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

inversely proportional to the diameter

directly proportional to the surface area

directly proportional to the specific weight of the fluid

inversely proportional to the surface tension

6.

Surface tension is due to

adhesion

viscous force

cohesion

the difference between cohesion and adhesion

7.

Fluid statics deals with

Viscous and pressure force

Surface tension and gravity force

Viscous and gravity force

Gravity and pressure force

8.

Which one of the following is correct dimension of surface tension

J/m²

N/m²

J/m

W/m

9.

The pitot tube is used to measure

static pressure

velocity at stagnation point

stagnation pressure

dynamic pressure

10.

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

viscous and surface tension forces

gravity and surface tension forces

gravity and pressure forces

gravity and viscous forces

Page 2 of 4

11.

The hydraulic grade line is

never above the energy grade line

always sloping downward in the direction of flow

always above the centre line of pipe

all of these

12.

The losses are more in

critical flow

laminar flow

transition flow

turbulent flow

13.

The eddy viscosity for turbulent flow is

a function of temperature only

independent of the flow

dependent on the flow

a physical property of the fluid

14.

What is the dimensions of kinematic viscosity of a fluid

L¹T ^-¹

L²T ^-¹

ML²T ^-¹

L²T ^-2

15.

Equation of continuity is based on the principle of conservation of

energy

mass

momentum

none of these

16.

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

free vortex motion

translation

circulation

Forced vortex motion

17.

A perfect fluid is

incompressible and frictionless

a real fluid

the one which obeys perfect gas laws

compressive and gaseous

18.

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

semi-circle

rectangle

triangle

trapezoidal

19.

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

4σ/d

6σ/d

8σ/d

2σ/d

20.

A real fluid is any fluid which

has constant viscosity and density

has surface tension and is compressible

has viscosity

has zero shear stress

Page 3 of 4

21.

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

is called

Newtonian fluid

Bingham plastic

Real fluid

Perfect fluid

22.

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

inversely proportional to its radial distance from axis of rotation

directly proportional to its radial distance from axis of rotation

23.

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

minimum wetted perimeter

least cost

minimum roughness coefficient

maximum area for a given flow

24.

Which of the following is used to measure the discharge?

current meter

venturimeter

pitot tube

hotwire anemometer

25.

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

viscosity

fluidity

relative density

elasticity

26.

An ideal fluid

satisfies the relation PV=RT

is both incompressible and non-viscous

is non-viscous

obey's the Newton's law of viscosity

27.

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

gs/cm

g-cm/s

dyne/cm^2

dyne-s/cm^2

28.

Hydraulic jump is a

i) steady flow

ii) uniform flow

iii) unsteady flow

iv) non-uniform flow

The correct answer is

(iii) and (iv)

(i) and (ii)

(ii) and (iii)

(i) and (iv)

29.

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

30.

Capillary action is due to the

adhesion of liquid particles on the surface

viscosity of liquid

cohesion of liquid particles

surface tension

Page 4 of 4

31.

The speed of a pressure wave through a pipe depends upon

the original head

the viscosity of fluid

the length of pipe

the bulk modulus for the fluid

32.

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

0.0311

0.0252

0.2520

33.

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

34.

Dynamic viscosity has the dimension as

ML^-¹T^-¹

L²T^-¹

ML^-2

ML^-2T^-2

35.

Fluid is a substance which offers no resistance to change of

pressure

shape

volume

flow

36.

In a Sutro weir, the discharge is proportional to

where H is Head.

H

H^3/2

H^5/2

H^1/2

37.

Pseodo plastic is a fluid for which

Newton's law of viscosity holds good

dynamic viscosity decreases as the rate of shear increases

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

dynamic viscosity increases as the rate of shear increases

38.

The major loss of energy in long pipes is due to

sudden enlargement

sudden contraction

friction

gradual contraction or enlargement

39.

The pressure rise due to water hammer depends upon

Length of pipe

Velocity of flow of water in pipe

All of these

Time taken to close the valve

40.

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

Fluid Mechanics MCQs Set-1

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