Fluid Mechanics MCQs Set-1

Page 1 of 4

1.

The pressure at the summit of a syphon is

more than atmospheric

less than atmospheric

equal to atmospheric

none of these

2.

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

elasticity

relative density

fluidity

viscosity

3.

Fluid statics deals with

Viscous and gravity force

Surface tension and gravity force

Gravity and pressure force

Viscous and pressure force

4.

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

triangle

trapezoidal

semi-circle

rectangle

5.

Coefficient of velocity of venturimeter

is independent of Reynolds number

none of these

decreases with higher Reynolds number

is equal to the coefficient of discharge of venturimeter

6.

Fluid is a substance which offers no resistance to change of

pressure

flow

shape

volume

7.

The major loss of energy in long pipes is due to

sudden contraction

gradual contraction or enlargement

friction

sudden enlargement

8.

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

is never zero

is independent of coordinates

is always zero

can be zero

9.

The pitot tube is used to measure

dynamic pressure

stagnation pressure

static pressure

velocity at stagnation point

10.

A real fluid is any fluid which

has surface tension and is compressible

has constant viscosity and density

has viscosity

has zero shear stress

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11.

What is the dimensions of kinematic viscosity of a fluid

L¹T ^-¹

L²T ^-2

ML²T ^-¹

L²T ^-¹

12.

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 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

13.

Equation of continuity is based on the principle of conservation of

momentum

none of these

mass

energy

14.

An ideal fluid

is both incompressible and non-viscous

is non-viscous

obey's the Newton's law of viscosity

satisfies the relation PV=RT

15.

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

least cost

maximum area for a given flow

minimum wetted perimeter

minimum roughness coefficient

16.

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

Forced vortex motion

translation

free vortex motion

circulation

17.

A perfect fluid is

compressive and gaseous

incompressible and frictionless

a real fluid

the one which obeys perfect gas laws

18.

The pressure rise due to water hammer depends upon

Length of pipe

All of these

Time taken to close the valve

Velocity of flow of water in pipe

19.

The eddy viscosity for turbulent flow is

dependent on the flow

a physical property of the fluid

a function of temperature only

independent of the flow

20.

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

Newton's law of viscosity holds good

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

Page 3 of 4

21.

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

viscous and surface tension forces

gravity and surface tension forces

gravity and viscous forces

gravity and pressure forces

22.

Capillary action is due to the

surface tension

viscosity of liquid

cohesion of liquid particles

adhesion of liquid particles on the surface

23.

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

is called

Bingham plastic

Perfect fluid

Real fluid

Newtonian fluid

24.

Hydraulic jump is a

i) steady flow

ii) uniform flow

iii) unsteady flow

iv) non-uniform flow

The correct answer is

(iii) and (iv)

(i) and (ii)

(ii) and (iii)

(i) and (iv)

25.

Hot wire anemometer is used to measure

pressure intensity of liquid

discharge

pressure intensity of gas

velocity of gas

26.

Which one of the following is correct dimension of surface tension

W/m

N/m²

J/m

J/m²

27.

The losses are more in

transition flow

turbulent flow

laminar flow

critical flow

28.

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

higher than

none of these

same as

lower than

29.

The hydraulic jump always occurs from

above critical depth to below critical depth

below critical depth to above normal depth

above normal depth to below normal depth

below critical depth to above critical depth

30.

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

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31.

The speed of a pressure wave through a pipe depends upon

the bulk modulus for the fluid

the original head

the length of pipe

the viscosity of fluid

32.

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

4σ/d

6σ/d

8σ/d

2σ/d

33.

In a Sutro weir, the discharge is proportional to

where H is Head.

H^3/2

H^1/2

H^5/2

H

34.

The hydraulic grade line is

always above the centre line of pipe

all of these

never above the energy grade line

always sloping downward in the direction of flow

35.

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

dyne-s/cm^2

gs/cm

g-cm/s

dyne/cm^2

36.

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

0.146 N/m^2

146 N/m^2

73 N/m^2

292 N/m^2

37.

Surface tension is due to

viscous force

the difference between cohesion and adhesion

adhesion

cohesion

38.

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

directly proportional to the specific weight of the fluid

inversely proportional to the diameter

directly proportional to the surface area

inversely proportional to the surface tension

39.

Which of the following is used to measure the discharge?

venturimeter

current meter

pitot tube

hotwire anemometer

40.

Dynamic viscosity has the dimension as

L²T^-¹

ML^-2

ML^-2T^-2

ML^-¹T^-¹

Fluid Mechanics MCQs Set-1

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