Fluid Mechanics MCQs Set-1

Page 1 of 4

1.

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

2.

The major loss of energy in long pipes is due to

friction

sudden enlargement

sudden contraction

gradual contraction or enlargement

3.

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

directly proportional to the surface area

inversely proportional to the diameter

inversely proportional to the surface tension

4.

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

maximum area for a given flow

least cost

minimum roughness coefficient

minimum wetted perimeter

5.

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)

(ii) and (iii)

(iii) and (iv)

6.

What is the dimensions of kinematic viscosity of a fluid

L²T ^-2

L¹T ^-¹

ML²T ^-¹

L²T ^-¹

7.

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

gravity and viscous forces

gravity and surface tension forces

viscous and surface tension forces

gravity and pressure forces

8.

Fluid is a substance which offers no resistance to change of

volume

shape

pressure

flow

9.

Which one of the following is correct dimension of surface tension

N/m²

J/m

W/m

J/m²

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

inversely proportional to its radial distance from axis of rotation

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

directly proportional to its radial distance from axis of rotation

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11.

An ideal fluid

is non-viscous

satisfies the relation PV=RT

obey's the Newton's law of viscosity

is both incompressible and non-viscous

12.

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 ?

0.0252

0.0206

0.2520

0.0311

13.

The pitot tube is used to measure

stagnation pressure

dynamic pressure

velocity at stagnation point

static pressure

14.

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

is called

Real fluid

Perfect fluid

Newtonian fluid

Bingham plastic

15.

Equation of continuity is based on the principle of conservation of

momentum

energy

mass

none of these

16.

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

17.

Dynamic viscosity has the dimension as

ML^-2T^-2

ML^-2

ML^-¹T^-¹

L²T^-¹

18.

The losses are more in

critical flow

transition flow

turbulent flow

laminar flow

19.

A perfect fluid is

the one which obeys perfect gas laws

a real fluid

compressive and gaseous

incompressible and frictionless

20.

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

same as

lower than

higher than

none of these

Page 3 of 4

21.

Coefficient of velocity of venturimeter

is independent of Reynolds number

is equal to the coefficient of discharge of venturimeter

decreases with higher Reynolds number

none of these

22.

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

23.

Fluid statics deals with

Gravity and pressure force

Surface tension and gravity force

Viscous and pressure force

Viscous and gravity force

24.

In a Sutro weir, the discharge is proportional to

where H is Head.

H^3/2

H^1/2

H

H^5/2

25.

The hydraulic jump always occurs from

above normal depth to below normal depth

below critical depth to above critical depth

above critical depth to below critical depth

below critical depth to above normal depth

26.

Surface tension is due to

adhesion

viscous force

cohesion

the difference between cohesion and adhesion

27.

Capillary action is due to the

surface tension

cohesion of liquid particles

adhesion of liquid particles on the surface

viscosity of liquid

28.

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

translation

free vortex motion

Forced vortex motion

circulation

29.

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

dyne/cm^2

g-cm/s

gs/cm

dyne-s/cm^2

30.

A real fluid is any fluid which

has viscosity

has zero shear stress

has surface tension and is compressible

has constant viscosity and density

Page 4 of 4

31.

Hot wire anemometer is used to measure

pressure intensity of gas

discharge

velocity of gas

pressure intensity of liquid

32.

The hydraulic grade line is

always sloping downward in the direction of flow

never above the energy grade line

always above the centre line of pipe

all of these

33.

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

semi-circle

triangle

rectangle

trapezoidal

34.

The pressure rise due to water hammer depends upon

Velocity of flow of water in pipe

All of these

Time taken to close the valve

Length of pipe

35.

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

36.

Which of the following is used to measure the discharge?

hotwire anemometer

current meter

pitot tube

venturimeter

37.

The pressure at the summit of a syphon is

none of these

less than atmospheric

more than atmospheric

equal to atmospheric

38.

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

8σ/d

6σ/d

4σ/d

2σ/d

39.

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

elasticity

relative density

fluidity

viscosity

40.

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 as the rate of shear increases

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

Fluid Mechanics MCQs Set-1

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