Fluid Mechanics MCQs Set-1

Page 1 of 4

1.

Hydraulic jump is a

i) steady flow

ii) uniform flow

iii) unsteady flow

iv) non-uniform flow

The correct answer is

(i) and (iv)

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

2.

The pitot tube is used to measure

dynamic pressure

stagnation pressure

velocity at stagnation point

static pressure

3.

A perfect fluid is

compressive and gaseous

the one which obeys perfect gas laws

a real fluid

incompressible and frictionless

4.

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

5.

The speed of a pressure wave through a pipe depends upon

the viscosity of fluid

the original head

the length of pipe

the bulk modulus for the fluid

6.

Surface tension is due to

cohesion

adhesion

viscous force

the difference between cohesion and adhesion

7.

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

8.

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

9.

An ideal fluid

is both incompressible and non-viscous

obey's the Newton's law of viscosity

is non-viscous

satisfies the relation PV=RT

10.

Dynamic viscosity has the dimension as

ML^-¹T^-¹

ML^-2T^-2

ML^-2

L²T^-¹

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11.

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

12.

In a forced vortex motion, the velocity of flow is

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

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

13.

The hydraulic grade line is

always above the centre line of pipe

never above the energy grade line

all of these

always sloping downward in the direction of flow

14.

What is the dimensions of kinematic viscosity of a fluid

L¹T ^-¹

L²T ^-2

L²T ^-¹

ML²T ^-¹

15.

Fluid statics deals with

Viscous and pressure force

Gravity and pressure force

Surface tension and gravity force

Viscous and gravity force

16.

Pseodo plastic is a fluid for which

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

Newton's law of viscosity holds good

17.

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

18.

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

2σ/d

6σ/d

8σ/d

4σ/d

19.

Capillary action is due to the

surface tension

cohesion of liquid particles

adhesion of liquid particles on the surface

viscosity of liquid

20.

A real fluid is any fluid which

has constant viscosity and density

has zero shear stress

has viscosity

has surface tension and is compressible

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21.

Which one of the following is correct dimension of surface tension

J/m

N/m²

W/m

J/m²

22.

Coefficient of velocity of venturimeter

is equal to the coefficient of discharge of venturimeter

decreases with higher Reynolds number

is independent of Reynolds number

none of these

23.

Equation of continuity is based on the principle of conservation of

mass

energy

momentum

none of these

24.

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

Forced vortex motion

translation

circulation

free vortex motion

25.

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

relative density

elasticity

viscosity

fluidity

26.

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

dyne-s/cm^2

g-cm/s

dyne/cm^2

gs/cm

27.

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

same as

lower than

higher than

none of these

28.

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

directly proportional to the surface area

inversely proportional to the diameter

inversely proportional to the surface tension

directly proportional to the specific weight of the fluid

29.

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

30.

The losses are more in

turbulent flow

transition flow

critical flow

laminar flow

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31.

Which of the following is used to measure the discharge?

current meter

venturimeter

pitot tube

hotwire anemometer

32.

The eddy viscosity for turbulent flow is

dependent on the flow

a function of temperature only

independent of the flow

a physical property of the fluid

33.

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

is called

Real fluid

Bingham plastic

Newtonian fluid

Perfect fluid

34.

Fluid is a substance which offers no resistance to change of

flow

volume

shape

pressure

35.

In a Sutro weir, the discharge is proportional to

where H is Head.

H^5/2

H^1/2

H^3/2

H

36.

The pressure at the summit of a syphon is

more than atmospheric

none of these

equal to atmospheric

less than atmospheric

37.

Hot wire anemometer is used to measure

pressure intensity of liquid

discharge

velocity of gas

pressure intensity of gas

38.

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

semi-circle

triangle

rectangle

trapezoidal

39.

The major loss of energy in long pipes is due to

friction

gradual contraction or enlargement

sudden enlargement

sudden contraction

40.

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 ?

0.0311

0.0206

0.2520

0.0252

Fluid Mechanics MCQs Set-1

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