Fluid Mechanics MCQs Set-1

Page 1 of 4

1.

A real fluid is any fluid which

has viscosity

has constant viscosity and density

has zero shear stress

has surface tension and is compressible

2.

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

dyne-s/cm^2

dyne/cm^2

gs/cm

g-cm/s

3.

Fluid is a substance which offers no resistance to change of

shape

volume

flow

pressure

4.

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

least cost

maximum area for a given flow

minimum roughness coefficient

minimum wetted perimeter

5.

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

relative density

viscosity

elasticity

fluidity

6.

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

73 N/m^2

0.146 N/m^2

7.

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

viscous and surface tension forces

gravity and pressure forces

gravity and viscous forces

gravity and surface tension forces

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)

(iii) and (iv)

(ii) and (iii)

(i) and (ii)

9.

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

10.

Fluid statics deals with

Viscous and gravity force

Viscous and pressure force

Surface tension and gravity force

Gravity and pressure force

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11.

Equation of continuity is based on the principle of conservation of

mass

momentum

none of these

energy

12.

What is the dimensions of kinematic viscosity of a fluid

L²T ^-¹

L²T ^-2

ML²T ^-¹

L¹T ^-¹

13.

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

can be zero

is independent of coordinates

is always zero

is never zero

14.

Capillary action is due to the

cohesion of liquid particles

surface tension

adhesion of liquid particles on the surface

viscosity of liquid

15.

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

4σ/d

8σ/d

2σ/d

6σ/d

16.

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

lower than

same as

higher than

none of these

17.

Which of the following is used to measure the discharge?

pitot tube

venturimeter

current meter

hotwire anemometer

18.

Hot wire anemometer is used to measure

velocity of gas

pressure intensity of gas

pressure intensity of liquid

discharge

19.

The losses are more in

critical flow

laminar flow

turbulent flow

transition flow

20.

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

circulation

free vortex motion

translation

Forced vortex motion

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21.

Which one of the following is correct dimension of surface tension

W/m

J/m

J/m²

N/m²

22.

The pressure at the summit of a syphon is

more than atmospheric

equal to atmospheric

none of these

less than atmospheric

23.

The pressure rise due to water hammer depends upon

Length of pipe

Time taken to close the valve

All of these

Velocity of flow of water in pipe

24.

The eddy viscosity for turbulent flow is

independent of the flow

a physical property of the fluid

dependent on the flow

a function of temperature only

25.

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

inversely proportional to the surface tension

inversely proportional to the diameter

directly proportional to the surface area

directly proportional to the specific weight of the fluid

26.

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

27.

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

is called

Perfect fluid

Newtonian fluid

Bingham plastic

Real fluid

28.

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

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

Newton's law of viscosity holds good

29.

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

30.

Surface tension is due to

the difference between cohesion and adhesion

adhesion

viscous force

cohesion

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31.

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

0.2520

0.0252

32.

Coefficient of velocity of venturimeter

is independent of Reynolds number

is equal to the coefficient of discharge of venturimeter

none of these

decreases with higher Reynolds number

33.

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

triangle

rectangle

semi-circle

trapezoidal

34.

The major loss of energy in long pipes is due to

sudden enlargement

friction

sudden contraction

gradual contraction or enlargement

35.

The pitot tube is used to measure

dynamic pressure

velocity at stagnation point

static pressure

stagnation pressure

36.

The hydraulic jump always occurs from

below critical depth to above normal depth

above critical depth to below critical depth

below critical depth to above critical depth

above normal depth to below normal depth

37.

Dynamic viscosity has the dimension as

ML^-2

L²T^-¹

ML^-2T^-2

ML^-¹T^-¹

38.

The hydraulic grade line is

always sloping downward in the direction of flow

all of these

always above the centre line of pipe

never above the energy grade line

39.

In a Sutro weir, the discharge is proportional to

where H is Head.

H^3/2

H

H^1/2

H^5/2

40.

A perfect fluid is

a real fluid

incompressible and frictionless

the one which obeys perfect gas laws

compressive and gaseous

Fluid Mechanics MCQs Set-1

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