Fluid Mechanics MCQs Set-1

Page 1 of 4

1.

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

triangle

trapezoidal

rectangle

semi-circle

2.

Coefficient of velocity of venturimeter

none of these

is independent of Reynolds number

is equal to the coefficient of discharge of venturimeter

decreases with higher Reynolds number

3.

Fluid is a substance which offers no resistance to change of

flow

pressure

shape

volume

4.

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

directly proportional to the surface area

directly proportional to the specific weight of the fluid

inversely proportional to the diameter

inversely proportional to the surface tension

5.

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

0.0252

0.0206

0.2520

6.

Surface tension is due to

viscous force

adhesion

the difference between cohesion and adhesion

cohesion

7.

Dynamic viscosity has the dimension as

ML^-¹T^-¹

ML^-2

L²T^-¹

ML^-2T^-2

8.

The eddy viscosity for turbulent flow is

a function of temperature only

independent of the flow

a physical property of the fluid

dependent on the flow

9.

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

gravity and viscous forces

viscous and surface tension forces

gravity and surface tension forces

gravity and pressure forces

10.

The hydraulic jump always occurs from

below critical depth to above critical depth

below critical depth to above normal depth

above critical depth to below critical depth

above normal depth to below normal depth

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11.

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

relative density

fluidity

elasticity

viscosity

12.

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

lower than

same as

none of these

higher than

13.

An ideal fluid

obey's the Newton's law of viscosity

is both incompressible and non-viscous

satisfies the relation PV=RT

is non-viscous

14.

The pitot tube is used to measure

velocity at stagnation point

stagnation pressure

static pressure

dynamic pressure

15.

The losses are more in

turbulent flow

critical flow

transition flow

laminar flow

16.

The hydraulic grade line is

all of these

never above the energy grade line

always above the centre line of pipe

always sloping downward in the direction of flow

17.

Fluid statics deals with

Gravity and pressure force

Surface tension and gravity force

Viscous and pressure force

Viscous and gravity force

18.

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

minimum roughness coefficient

minimum wetted perimeter

maximum area for a given flow

least cost

19.

What is the dimensions of kinematic viscosity of a fluid

L¹T ^-¹

L²T ^-¹

L²T ^-2

ML²T ^-¹

20.

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

73 N/m^2

0.146 N/m^2

146 N/m^2

292 N/m^2

Page 3 of 4

21.

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

is called

Perfect fluid

Real fluid

Bingham plastic

Newtonian fluid

22.

The major loss of energy in long pipes is due to

friction

sudden enlargement

sudden contraction

gradual contraction or enlargement

23.

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

24.

Equation of continuity is based on the principle of conservation of

none of these

mass

energy

momentum

25.

Pseodo plastic is a fluid for which

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

dynamic viscosity increases as the rate of shear increases

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

inversely proportional to its radial distance from axis of rotation

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

27.

Which one of the following is correct dimension of surface tension

N/m²

J/m²

J/m

W/m

28.

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

dyne/cm^2

dyne-s/cm^2

gs/cm

g-cm/s

29.

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

free vortex motion

translation

circulation

Forced vortex motion

30.

Which of the following is used to measure the discharge?

hotwire anemometer

current meter

pitot tube

venturimeter

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31.

Hot wire anemometer is used to measure

pressure intensity of liquid

velocity of gas

pressure intensity of gas

discharge

32.

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

8σ/d

4σ/d

2σ/d

6σ/d

33.

The pressure at the summit of a syphon is

more than atmospheric

none of these

less than atmospheric

equal to atmospheric

34.

Capillary action is due to the

surface tension

viscosity of liquid

adhesion of liquid particles on the surface

cohesion of liquid particles

35.

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)

36.

The speed of a pressure wave through a pipe depends upon

the bulk modulus for the fluid

the viscosity of fluid

the original head

the length of pipe

37.

A real fluid is any fluid which

has constant viscosity and density

has viscosity

has surface tension and is compressible

has zero shear stress

38.

In a Sutro weir, the discharge is proportional to

where H is Head.

H^3/2

H^1/2

H

H^5/2

39.

A perfect fluid is

the one which obeys perfect gas laws

compressive and gaseous

incompressible and frictionless

a real fluid

40.

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

is independent of coordinates

can be zero

is always zero

is never zero

Fluid Mechanics MCQs Set-1

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