Fluid Mechanics MCQs Set-1

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1.

Capillary action is due to the

adhesion of liquid particles on the surface

surface tension

viscosity of liquid

cohesion of liquid particles

2.

Coefficient of velocity of venturimeter

decreases with higher Reynolds number

is equal to the coefficient of discharge of venturimeter

is independent of Reynolds number

none of these

3.

In a forced vortex motion, the velocity of flow is

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 the square of its radial distance from the axis of rotation

inversely proportional to its radial distance from axis of rotation

4.

Surface tension is due to

the difference between cohesion and adhesion

viscous force

adhesion

cohesion

5.

The pitot tube is used to measure

static pressure

velocity at stagnation point

dynamic pressure

stagnation pressure

6.

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)

(i) and (iv)

(ii) and (iii)

7.

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

8.

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

trapezoidal

triangle

semi-circle

rectangle

9.

An ideal fluid

is both incompressible and non-viscous

satisfies the relation PV=RT

obey's the Newton's law of viscosity

is non-viscous

10.

A perfect fluid is

compressive and gaseous

a real fluid

incompressible and frictionless

the one which obeys perfect gas laws

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11.

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

is called

Bingham plastic

Newtonian fluid

Real fluid

Perfect fluid

12.

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

0.0206

0.0311

0.2520

13.

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

circulation

Forced vortex motion

translation

free vortex motion

14.

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

15.

The major loss of energy in long pipes is due to

friction

sudden contraction

gradual contraction or enlargement

sudden enlargement

16.

Which one of the following is correct dimension of surface tension

N/m²

W/m

J/m

J/m²

17.

Fluid is a substance which offers no resistance to change of

volume

pressure

flow

shape

18.

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

dyne/cm^2

gs/cm

dyne-s/cm^2

g-cm/s

19.

The pressure rise due to water hammer depends upon

Velocity of flow of water in pipe

Time taken to close the valve

Length of pipe

All of these

20.

What is the dimensions of kinematic viscosity of a fluid

ML²T ^-¹

L²T ^-2

L¹T ^-¹

L²T ^-¹

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21.

The hydraulic grade line is

never above the energy grade line

all of these

always sloping downward in the direction of flow

always above the centre line of pipe

22.

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

dynamic viscosity increases as the rate of shear increases

Newton's law of viscosity holds good

23.

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

8σ/d

4σ/d

2σ/d

6σ/d

24.

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

minimum wetted perimeter

maximum area for a given flow

least cost

minimum roughness coefficient

25.

The losses are more in

transition flow

turbulent flow

laminar flow

critical flow

26.

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

27.

In a Sutro weir, the discharge is proportional to

where H is Head.

H

H^5/2

H^1/2

H^3/2

28.

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

29.

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

gravity and surface tension forces

gravity and viscous forces

gravity and pressure forces

viscous and surface tension forces

30.

Dynamic viscosity has the dimension as

L²T^-¹

ML^-2

ML^-2T^-2

ML^-¹T^-¹

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31.

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

none of these

higher than

same as

lower than

32.

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

33.

Equation of continuity is based on the principle of conservation of

mass

none of these

energy

momentum

34.

Hot wire anemometer is used to measure

pressure intensity of liquid

discharge

velocity of gas

pressure intensity of gas

35.

Fluid statics deals with

Gravity and pressure force

Viscous and gravity force

Surface tension and gravity force

Viscous and pressure force

36.

A real fluid is any fluid which

has zero shear stress

has surface tension and is compressible

has constant viscosity and density

has viscosity

37.

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

relative density

viscosity

fluidity

elasticity

38.

The pressure at the summit of a syphon is

less than atmospheric

none of these

more than atmospheric

equal to atmospheric

39.

Which of the following is used to measure the discharge?

current meter

pitot tube

hotwire anemometer

venturimeter

40.

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

Fluid Mechanics MCQs Set-1

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