Fluid Mechanics MCQs Set-1

Page 1 of 4

1.

A real fluid is any fluid which

has zero shear stress

has surface tension and is compressible

has viscosity

has constant viscosity and density

2.

A perfect fluid is

incompressible and frictionless

a real fluid

the one which obeys perfect gas laws

compressive and gaseous

3.

Fluid statics deals with

Surface tension and gravity force

Viscous and pressure force

Gravity and pressure force

Viscous and gravity force

4.

The hydraulic grade line is

always above the centre line of pipe

always sloping downward in the direction of flow

all of these

never above the energy grade line

5.

An ideal fluid

obey's the Newton's law of viscosity

is non-viscous

satisfies the relation PV=RT

is both incompressible and non-viscous

6.

Which of the following is used to measure the discharge?

current meter

hotwire anemometer

pitot tube

venturimeter

7.

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

minimum roughness coefficient

maximum area for a given flow

minimum wetted perimeter

least cost

8.

What is the dimensions of kinematic viscosity of a fluid

L²T ^-2

ML²T ^-¹

L¹T ^-¹

L²T ^-¹

9.

The eddy viscosity for turbulent flow is

a function of temperature only

a physical property of the fluid

dependent on the flow

independent of the flow

10.

Equation of continuity is based on the principle of conservation of

none of these

mass

energy

momentum

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11.

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

rectangle

semi-circle

triangle

trapezoidal

12.

The hydraulic jump always occurs from

below critical depth to above normal depth

above critical depth to below critical depth

above normal depth to below normal depth

below critical depth to above critical depth

13.

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

dyne/cm^2

gs/cm

g-cm/s

dyne-s/cm^2

14.

Hydraulic jump is a

i) steady flow

ii) uniform flow

iii) unsteady flow

iv) non-uniform flow

The correct answer is

(ii) and (iii)

(iii) and (iv)

(i) and (ii)

(i) and (iv)

15.

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

relative density

elasticity

viscosity

fluidity

16.

Fluid is a substance which offers no resistance to change of

flow

shape

volume

pressure

17.

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

18.

The speed of a pressure wave through a pipe depends upon

the viscosity of fluid

the original head

the bulk modulus for the fluid

the length of pipe

19.

Hot wire anemometer is used to measure

velocity of gas

pressure intensity of gas

pressure intensity of liquid

discharge

20.

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

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

inversely proportional to its radial distance from axis of rotation

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21.

Capillary action is due to the

cohesion of liquid particles

surface tension

viscosity of liquid

adhesion of liquid particles on the surface

22.

The pressure at the summit of a syphon is

less than atmospheric

more than atmospheric

none of these

equal to atmospheric

23.

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

is never zero

can be zero

is always zero

is independent of coordinates

24.

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

inversely proportional to the surface tension

directly proportional to the specific weight of the fluid

25.

In a Sutro weir, the discharge is proportional to

where H is Head.

H

H^3/2

H^5/2

H^1/2

26.

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

0.0311

0.2520

0.0206

27.

Surface tension is due to

the difference between cohesion and adhesion

viscous force

cohesion

adhesion

28.

Pseodo plastic is a fluid for which

Newton's law of viscosity holds good

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

29.

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

translation

Forced vortex motion

circulation

free vortex motion

30.

Dynamic viscosity has the dimension as

L²T^-¹

ML^-2

ML^-¹T^-¹

ML^-2T^-2

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31.

The major loss of energy in long pipes is due to

friction

sudden enlargement

sudden contraction

gradual contraction or enlargement

32.

Which one of the following is correct dimension of surface tension

W/m

J/m

J/m²

N/m²

33.

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

none of these

same as

lower than

higher than

34.

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

is called

Bingham plastic

Perfect fluid

Real fluid

Newtonian fluid

35.

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

36.

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

37.

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

73 N/m^2

0.146 N/m^2

146 N/m^2

38.

The pitot tube is used to measure

static pressure

stagnation pressure

velocity at stagnation point

dynamic pressure

39.

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

6σ/d

2σ/d

4σ/d

8σ/d

40.

The losses are more in

laminar flow

turbulent flow

critical flow

transition flow

Fluid Mechanics MCQs Set-1

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