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

semi-circle

rectangle

2.

The eddy viscosity for turbulent flow is

a physical property of the fluid

a function of temperature only

dependent on the flow

independent of the flow

3.

Hydraulic jump is a

i) steady flow

ii) uniform flow

iii) unsteady flow

iv) non-uniform flow

The correct answer is

(i) and (iv)

(ii) and (iii)

(i) and (ii)

(iii) and (iv)

4.

Hot wire anemometer is used to measure

pressure intensity of gas

discharge

pressure intensity of liquid

velocity of gas

5.

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

gravity and viscous forces

viscous and surface tension forces

gravity and pressure forces

gravity and surface tension forces

6.

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

is always zero

is never zero

can be zero

is independent of coordinates

7.

The major loss of energy in long pipes is due to

sudden contraction

friction

gradual contraction or enlargement

sudden enlargement

8.

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

lower than

same as

higher than

none of these

9.

What is the dimensions of kinematic viscosity of a fluid

L²T ^-2

ML²T ^-¹

L¹T ^-¹

L²T ^-¹

10.

The hydraulic jump always occurs from

below critical depth to above normal depth

below critical depth to above critical depth

above critical depth to below critical depth

above normal depth to below normal depth

Page 2 of 4

11.

The speed of a pressure wave through a pipe depends upon

the original head

the length of pipe

the viscosity of fluid

the bulk modulus for the fluid

12.

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

is called

Perfect fluid

Real fluid

Bingham plastic

Newtonian fluid

13.

The pitot tube is used to measure

velocity at stagnation point

static pressure

dynamic pressure

stagnation pressure

14.

A perfect fluid is

incompressible and frictionless

a real fluid

the one which obeys perfect gas laws

compressive and gaseous

15.

An ideal fluid

satisfies the relation PV=RT

obey's the Newton's law of viscosity

is non-viscous

is both incompressible and non-viscous

16.

Equation of continuity is based on the principle of conservation of

none of these

momentum

mass

energy

17.

A real fluid is any fluid which

has surface tension and is compressible

has viscosity

has constant viscosity and density

has zero shear stress

18.

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

19.

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

146 N/m^2

0.146 N/m^2

292 N/m^2

20.

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

0.2520

0.0311

0.0206

Page 3 of 4

21.

In a forced vortex motion, the velocity of flow is

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

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

22.

Capillary action is due to the

cohesion of liquid particles

adhesion of liquid particles on the surface

viscosity of liquid

surface tension

23.

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

8σ/d

2σ/d

4σ/d

6σ/d

24.

Fluid statics deals with

Surface tension and gravity force

Viscous and pressure force

Viscous and gravity force

Gravity and pressure force

25.

Which one of the following is correct dimension of surface tension

J/m²

N/m²

J/m

W/m

26.

Dynamic viscosity has the dimension as

ML^-2

ML^-2T^-2

L²T^-¹

ML^-¹T^-¹

27.

Surface tension is due to

adhesion

the difference between cohesion and adhesion

viscous force

cohesion

28.

The losses are more in

critical flow

turbulent flow

laminar flow

transition flow

29.

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

minimum wetted perimeter

maximum area for a given flow

minimum roughness coefficient

least cost

30.

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

Page 4 of 4

31.

In a Sutro weir, the discharge is proportional to

where H is Head.

H^3/2

H

H^5/2

H^1/2

32.

Which of the following is used to measure the discharge?

pitot tube

hotwire anemometer

current meter

venturimeter

33.

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

circulation

free vortex motion

translation

Forced vortex motion

34.

Fluid is a substance which offers no resistance to change of

volume

shape

pressure

flow

35.

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

fluidity

relative density

elasticity

viscosity

36.

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

gs/cm

g-cm/s

dyne-s/cm^2

dyne/cm^2

37.

The pressure rise due to water hammer depends upon

All of these

Time taken to close the valve

Velocity of flow of water in pipe

Length of pipe

38.

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 surface tension

inversely proportional to the diameter

directly proportional to the specific weight of the fluid

39.

The pressure at the summit of a syphon is

none of these

more than atmospheric

equal to atmospheric

less than atmospheric

40.

Pseodo plastic is a fluid for which

dynamic viscosity increases as the rate of shear increases

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

dynamic viscosity decreases as the rate of shear increases

Newton's law of viscosity holds good

Fluid Mechanics MCQs Set-1

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Fluid Mechanics MCQs Set-1

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection