Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

The multiplying factor for converting one poise into MKS unit of dynamic viscosity is

0.981

98.1

9.81

981

2.

Atmosphere pressure head in terms of water column is

10.30 m

7.5 m

8.5 m

9.81 m

3.

A Newtonian fluid is defined as the fluid which

is highly viscous

obey's Newton's law of viscosity

is compressible and non-viscous

is incompressible and non viscous

4.

The increase of temperature

decreases the viscosity of a liquid

decreases the viscosity of a gas

increases the viscosity of a gas

increases the viscosity of a liquid

5.

The pressure gradient in the direction of flow is equal to the

Velocity gradient parallel to the direction of flow

Shear gradient normal to the direction of flow

Shear gradient parallel to direction of flow

Velocity gradient normal to the direction of flow

6.

In an inclined pipe, the pressure at its two ends is due to

Exit head drop

All of these

Sudden head drop of inlet

Frictional loss head

7.

Centre of buoyancy always

coincides with the centre of gravity

coincides with the centroid of the volume of fluid displaced

remains below the centre of gravity

remains above the centre of gravity

8.

The motion of air mass in a tornado is a

free vortex motion

forced vortex motion

forced vortex at centre and free vortex outside

free vortex at centre and forced vortex outside

9.

Newton's law of viscosity depends upon the

Stress and strain in the fluid

Shear stress and rate of strain

Viscosity and shear stress

Shear stress, pressure and velocity

10.

The viscosity of water is ___________than that of mercury.

infinity

lower

zero

higher

Page 2 of 4

11.

The unit of kinematic viscosity is

gm/ cm-sec²

dyne-sec/cm²

cm²/sec

gm/cm²-sec

12.

Pascal-second is the unit of

kinematic viscosity

pressure

dynamic viscosity

surface tension

13.

The principle of operation of Brahma's press is based on

Newton's law

Dalton's law

Boyle's law

Pascal's law

14.

The viscosity of a gas

decreases with increase in temperature

increases with increase in temperature

is independent of pressure for very high pressure intensities

is independent of temperature

15.

Pressure measured with the help of piezometer tube is

Gauge pressure

Atmospheric pressure

Vacuum pressure

Absolute pressure

16.

The Mercury is known as non-wetting liquid because it does not wet the surface. The Mercury posses this property due to

Surface Tension

Viscosity

Cohesion

Adhesion

17.

In general, surface tension

decreases with increase of temperature

increases with increase in temperature

remains unaffected by temperature up to critical temperature

remains unaffected by temperature

18.

When subjected to shear force, a fluid

Deforms continuously only for small shear stresses

Deforms continuously no matter how smaller the shear stress may be

Deforms continuously only for large shear forces

Undergoes static deformation

19.

Pressure at a point inside a liquid does not depend on

The depth of the point below the surface of the liquid

The acceleration due to gravity at that point

The nature of the liquid

The shape of the containing vessel

20.

Stoke is the unit of

None of these

Kinematic viscosity

Viscosity

Surface Tension

Page 3 of 4

21.

When the velocity distribution is uniform over the cross-section, the correction factor for momentum is

1

0

2

4/3

22.

If a liquid has greater cohesion than adhesion with the solid, then the liquid in the capillary tube will

depress with concave surface upward

depress with convex surface upward

rise with convex surface upward

rise with concave surface upward

23.

Kinematic viscosity (v) is equal to

μ x ρ

μ /ρ

ρ/μ

none of these

24.

An ideal fluid is

very viscous

frictionless and compressible

frictionless and incompressible

one which obeys Newton's law of viscosity

25.

Capillarity is due to

Surface tension

Cohesion of liquid particles

Cohesion and adhesion both

adhesion of liquid particle to a surface

26.

Newton's law of viscosity for a fluid states that the shear stress is

proportional to rate of angular deformation

inversely proportional to angular deformation

inversely proportional to rate of angular deformation

proportional to angular deformation

27.

In the phenomenon of cavitation, the characteristics fluid property involved is

Vapour pressure

Viscosity

Surface tension

Bulk modulus of elasticity

28.

A barometer is used to measure

Very low pressure

Very high pressure

Pressure difference between two points

Atmospheric pressure

29.

Surface Tension has the units of

None of these

Force per unit length

Force per unit area

Force per unit volume

30.

Which property of mercury is the main reason for its use in barometers?

high density

very low vapour pressure

low compressibility

negligible capillary effect

Page 4 of 4

31.

Hydrostatic pressure on a dam depends upon its

Shape

Depth

All of these

Length

32.

The capillary rise at 20° C in clean glass tube of 1 mm diameter containing water is

20 mm

30 mm

50 mm

15 mm

33.

Stream lines and path lines always coincide in case of

turbulent flow

uniform flow

steady flow

laminar flow

34.

An ideal fluid is defined as the fluid which

is compressible

has negligible surface tension

is incompressible and non-viscous (inviscid)

is incompressible

35.

A fluid flow in which the density of the fluid changes significantly during flow is called as

non-linear

incompressible

compressible

uniform

36.

The pressure intensity in kg/cm^2 at any point in a liquid is

h/W

W

W/h

W.h

37.

The property by virtue of which a liquid opposes relative motion between its different layers is called

Viscosity

Capillarity

Cohesion

Surface Tension

38.

Pascal's law states that pressure at a point is equal in all directions

In a turbulent flow

In a liquid at rest

In a laminar flow

In a fluid at rest

39.

The rise of liquid of specific weight γ in a capillary tube of radius r is given by

σ / 2rγ

γσ / 2r

2σ / r

2σ / rγ

40.

A floating body is said to be in a state of stable equilibrium

when its metacentric height is zero

when the metacentre is below the centre of gravity

only when its centre of gravity is below its centre of buoyancy

when the metacentre is above the centre of gravity

Fluid Mechanics MCQs Set-2

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Fluid Mechanics MCQs Set-2

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection