Fluid Mechanics MCQs Set-1

Page 1 of 4

1.

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

fluidity

elasticity

relative density

viscosity

2.

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

3.

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

gravity and viscous forces

gravity and pressure forces

viscous and surface tension forces

gravity and surface tension forces

4.

Hot wire anemometer is used to measure

pressure intensity of liquid

discharge

velocity of gas

pressure intensity of gas

5.

The losses are more in

transition flow

critical flow

laminar flow

turbulent flow

6.

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

dyne-s/cm^2

dyne/cm^2

g-cm/s

gs/cm

7.

The eddy viscosity for turbulent flow is

a physical property of the fluid

independent of the flow

dependent on the flow

a function of temperature only

8.

Hydraulic jump is a

i) steady flow

ii) uniform flow

iii) unsteady flow

iv) non-uniform flow

The correct answer is

(i) and (iv)

(ii) and (iii)

(iii) and (iv)

(i) and (ii)

9.

A perfect fluid is

compressive and gaseous

the one which obeys perfect gas laws

incompressible and frictionless

a real fluid

10.

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

292 N/m^2

0.146 N/m^2

73 N/m^2

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11.

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

is called

Real fluid

Perfect fluid

Bingham plastic

Newtonian fluid

12.

In a forced vortex motion, the velocity of flow is

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

inversely proportional to its radial distance from axis of rotation

13.

The pitot tube is used to measure

velocity at stagnation point

stagnation pressure

static pressure

dynamic pressure

14.

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

15.

Fluid statics deals with

Viscous and gravity force

Gravity and pressure force

Viscous and pressure force

Surface tension and gravity force

16.

Surface tension is due to

cohesion

viscous force

adhesion

the difference between cohesion and adhesion

17.

In a Sutro weir, the discharge is proportional to

where H is Head.

H^1/2

H

H^3/2

H^5/2

18.

The pressure rise due to water hammer depends upon

Time taken to close the valve

All of these

Length of pipe

Velocity of flow of water in pipe

19.

The major loss of energy in long pipes is due to

gradual contraction or enlargement

sudden contraction

friction

sudden enlargement

20.

The hydraulic jump always occurs from

above critical depth to below critical depth

below critical depth to above critical depth

below critical depth to above normal depth

above normal depth to below normal depth

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21.

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

0.0311

0.2520

22.

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

23.

Dynamic viscosity has the dimension as

L²T^-¹

ML^-¹T^-¹

ML^-2

ML^-2T^-2

24.

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

25.

Which of the following is used to measure the discharge?

current meter

venturimeter

hotwire anemometer

pitot tube

26.

An ideal fluid

obey's the Newton's law of viscosity

is both incompressible and non-viscous

is non-viscous

satisfies the relation PV=RT

27.

What is the dimensions of kinematic viscosity of a fluid

ML²T ^-¹

L¹T ^-¹

L²T ^-¹

L²T ^-2

28.

Coefficient of velocity of venturimeter

is equal to the coefficient of discharge of venturimeter

decreases with higher Reynolds number

none of these

is independent of Reynolds number

29.

The pressure at the summit of a syphon is

more than atmospheric

less than atmospheric

equal to atmospheric

none of these

30.

A real fluid is any fluid which

has constant viscosity and density

has surface tension and is compressible

has zero shear stress

has viscosity

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31.

Capillary action is due to the

surface tension

adhesion of liquid particles on the surface

cohesion of liquid particles

viscosity of liquid

32.

Pseodo plastic is a fluid for which

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

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

33.

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

same as

higher than

none of these

lower than

34.

Fluid is a substance which offers no resistance to change of

shape

flow

pressure

volume

35.

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

trapezoidal

triangle

rectangle

semi-circle

36.

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

2σ/d

8σ/d

6σ/d

4σ/d

37.

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

38.

Which one of the following is correct dimension of surface tension

J/m

J/m²

N/m²

W/m

39.

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

Forced vortex motion

translation

free vortex motion

circulation

40.

Equation of continuity is based on the principle of conservation of

energy

momentum

none of these

mass

Fluid Mechanics MCQs Set-1

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