Fluid Mechanics MCQs Set-1

Page 1 of 4

1.

The speed of a pressure wave through a pipe depends upon

the bulk modulus for the fluid

the length of pipe

the viscosity of fluid

the original head

2.

In a Sutro weir, the discharge is proportional to

where H is Head.

H

H^5/2

H^1/2

H^3/2

3.

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

73 N/m^2

292 N/m^2

0.146 N/m^2

4.

The pressure rise due to water hammer depends upon

All of these

Velocity of flow of water in pipe

Length of pipe

Time taken to close the valve

5.

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

triangle

rectangle

trapezoidal

semi-circle

6.

What is the dimensions of kinematic viscosity of a fluid

L¹T ^-¹

ML²T ^-¹

L²T ^-2

L²T ^-¹

7.

An ideal fluid

is non-viscous

is both incompressible and non-viscous

satisfies the relation PV=RT

obey's the Newton's law of viscosity

8.

Hydraulic jump is a

i) steady flow

ii) uniform flow

iii) unsteady flow

iv) non-uniform flow

The correct answer is

(ii) and (iii)

(i) and (iv)

(iii) and (iv)

(i) and (ii)

9.

A real fluid is any fluid which

has viscosity

has zero shear stress

has constant viscosity and density

has surface tension and is compressible

10.

Which one of the following is correct dimension of surface tension

J/m

W/m

N/m²

J/m²

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11.

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 specific weight of the fluid

directly proportional to the surface area

12.

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

13.

Capillary action is due to the

viscosity of liquid

surface tension

adhesion of liquid particles on the surface

cohesion of liquid particles

14.

Equation of continuity is based on the principle of conservation of

momentum

energy

none of these

mass

15.

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

16.

In a forced vortex motion, the velocity of flow is

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

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

17.

Fluid is a substance which offers no resistance to change of

pressure

shape

flow

volume

18.

The pitot tube is used to measure

stagnation pressure

dynamic pressure

velocity at stagnation point

static pressure

19.

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

lower than

higher than

same as

none of these

20.

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

Forced vortex motion

free vortex motion

circulation

translation

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21.

A perfect fluid is

a real fluid

incompressible and frictionless

compressive and gaseous

the one which obeys perfect gas laws

22.

Which of the following is used to measure the discharge?

hotwire anemometer

venturimeter

pitot tube

current meter

23.

The pressure at the summit of a syphon is

more than atmospheric

less than atmospheric

none of these

equal to atmospheric

24.

Dynamic viscosity has the dimension as

ML^-¹T^-¹

ML^-2

L²T^-¹

ML^-2T^-2

25.

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

0.2520

0.0311

0.0206

26.

The eddy viscosity for turbulent flow is

dependent on the flow

independent of the flow

a physical property of the fluid

a function of temperature only

27.

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

is always zero

can be zero

is never zero

is independent of coordinates

28.

The major loss of energy in long pipes is due to

sudden contraction

sudden enlargement

friction

gradual contraction or enlargement

29.

Surface tension is due to

cohesion

viscous force

the difference between cohesion and adhesion

adhesion

30.

Fluid statics deals with

Viscous and pressure force

Surface tension and gravity force

Gravity and pressure force

Viscous and gravity force

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31.

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

fluidity

elasticity

relative density

viscosity

32.

The hydraulic grade line is

never above the energy grade line

all of these

always above the centre line of pipe

always sloping downward in the direction of flow

33.

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

viscous and surface tension forces

gravity and pressure forces

gravity and surface tension forces

gravity and viscous forces

34.

The losses are more in

laminar flow

critical flow

transition flow

turbulent flow

35.

Coefficient of velocity of venturimeter

is independent of Reynolds number

decreases with higher Reynolds number

none of these

is equal to the coefficient of discharge of venturimeter

36.

Hot wire anemometer is used to measure

pressure intensity of liquid

pressure intensity of gas

velocity of gas

discharge

37.

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

least cost

minimum roughness coefficient

minimum wetted perimeter

maximum area for a given flow

38.

The hydraulic jump always occurs from

above critical depth to below critical depth

above normal depth to below normal depth

below critical depth to above normal depth

below critical depth to above critical depth

39.

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

2σ/d

4σ/d

8σ/d

6σ/d

40.

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

is called

Perfect fluid

Bingham plastic

Newtonian fluid

Real fluid

Fluid Mechanics MCQs Set-1

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