Fluid Mechanics MCQs Set-1

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1.

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

2.

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

is called

Real fluid

Bingham plastic

Newtonian fluid

Perfect fluid

3.

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 ?

0.2520

0.0206

0.0252

0.0311

4.

The pressure rise due to water hammer depends upon

All of these

Length of pipe

Velocity of flow of water in pipe

Time taken to close the valve

5.

Surface tension is due to

the difference between cohesion and adhesion

cohesion

viscous force

adhesion

6.

An ideal fluid

is non-viscous

is both incompressible and non-viscous

obey's the Newton's law of viscosity

satisfies the relation PV=RT

7.

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

fluidity

elasticity

viscosity

relative density

8.

The speed of a pressure wave through a pipe depends upon

the length of pipe

the original head

the bulk modulus for the fluid

the viscosity of fluid

9.

The pitot tube is used to measure

dynamic pressure

static pressure

velocity at stagnation point

stagnation pressure

10.

What is the dimensions of kinematic viscosity of a fluid

L¹T ^-¹

L²T ^-¹

L²T ^-2

ML²T ^-¹

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11.

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

is independent of coordinates

is always zero

can be zero

is never zero

12.

The eddy viscosity for turbulent flow is

independent of the flow

a physical property of the fluid

dependent on the flow

a function of temperature only

13.

Hot wire anemometer is used to measure

discharge

pressure intensity of liquid

pressure intensity of gas

velocity of gas

14.

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

translation

circulation

Forced vortex motion

free vortex motion

15.

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

16.

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

inversely proportional to the diameter

inversely proportional to the surface tension

directly proportional to the specific weight of the fluid

directly proportional to the surface area

17.

The losses are more in

laminar flow

transition flow

turbulent flow

critical flow

18.

The major loss of energy in long pipes is due to

gradual contraction or enlargement

sudden enlargement

friction

sudden contraction

19.

A real fluid is any fluid which

has constant viscosity and density

has viscosity

has surface tension and is compressible

has zero shear stress

20.

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

gravity and surface tension forces

gravity and viscous forces

viscous and surface tension forces

gravity and pressure forces

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21.

Fluid is a substance which offers no resistance to change of

flow

shape

volume

pressure

22.

Which one of the following is correct dimension of surface tension

J/m²

J/m

W/m

N/m²

23.

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

lower than

higher than

same as

none of these

24.

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)

(iii) and (iv)

(ii) and (iii)

25.

Capillary action is due to the

adhesion of liquid particles on the surface

cohesion of liquid particles

viscosity of liquid

surface tension

26.

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

27.

Which of the following is used to measure the discharge?

hotwire anemometer

pitot tube

venturimeter

current meter

28.

The hydraulic grade line is

always sloping downward in the direction of flow

never above the energy grade line

all of these

always above the centre line of pipe

29.

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

gs/cm

g-cm/s

dyne/cm^2

dyne-s/cm^2

30.

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

semi-circle

rectangle

trapezoidal

triangle

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31.

The hydraulic jump always occurs from

below critical depth to above critical depth

above critical depth to below critical depth

below critical depth to above normal depth

above normal depth to below normal depth

32.

Equation of continuity is based on the principle of conservation of

mass

none of these

momentum

energy

33.

A perfect fluid is

incompressible and frictionless

the one which obeys perfect gas laws

compressive and gaseous

a real fluid

34.

Fluid statics deals with

Viscous and pressure force

Surface tension and gravity force

Gravity and pressure force

Viscous and gravity force

35.

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

2σ/d

6σ/d

4σ/d

8σ/d

36.

Pseodo plastic is a fluid for which

Newton's law of viscosity holds good

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

dynamic viscosity decreases as the rate of shear increases

dynamic viscosity increases as the rate of shear increases

37.

In a Sutro weir, the discharge is proportional to

where H is Head.

H^1/2

H

H^3/2

H^5/2

38.

Dynamic viscosity has the dimension as

ML^-¹T^-¹

ML^-2

L²T^-¹

ML^-2T^-2

39.

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

40.

The pressure at the summit of a syphon is

less than atmospheric

none of these

more than atmospheric

equal to atmospheric

Fluid Mechanics MCQs Set-1

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