Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

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

Shear gradient parallel to direction of flow

Velocity gradient normal to the direction of flow

Shear gradient normal to the direction of flow

Velocity gradient parallel to the direction of flow

2.

The viscosity of water is ___________than that of mercury.

zero

higher

lower

infinity

3.

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

σ / 2rγ

2σ / r

γσ / 2r

2σ / rγ

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.

Centre of buoyancy always

remains below the centre of gravity

coincides with the centroid of the volume of fluid displaced

remains above the centre of gravity

coincides with the centre of gravity

6.

Pascal-second is the unit of

surface tension

pressure

kinematic viscosity

dynamic viscosity

7.

Kinematic viscosity (v) is equal to

μ /ρ

none of these

μ x ρ

ρ/μ

8.

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

Surface tension

Viscosity

Vapour pressure

Bulk modulus of elasticity

9.

Stream lines and path lines always coincide in case of

laminar flow

steady flow

turbulent flow

uniform flow

10.

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

when the metacentre is below the centre of gravity

when the metacentre is above the centre of gravity

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

when its metacentric height is zero

Page 2 of 4

11.

Atmosphere pressure head in terms of water column is

10.30 m

8.5 m

7.5 m

9.81 m

12.

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

high density

very low vapour pressure

negligible capillary effect

low compressibility

13.

The unit of kinematic viscosity is

cm²/sec

gm/cm²-sec

dyne-sec/cm²

gm/ cm-sec²

14.

The motion of air mass in a tornado is a

free vortex at centre and forced vortex outside

free vortex motion

forced vortex motion

forced vortex at centre and free vortex outside

15.

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

In a turbulent flow

In a fluid at rest

In a liquid at rest

In a laminar flow

16.

Pressure at a point inside a liquid does not depend on

The shape of the containing vessel

The nature of the liquid

The depth of the point below the surface of the liquid

The acceleration due to gravity at that point

17.

Stoke is the unit of

Kinematic viscosity

Surface Tension

None of these

Viscosity

18.

A barometer is used to measure

Very low pressure

Atmospheric pressure

Very high pressure

Pressure difference between two points

19.

Hydrostatic pressure on a dam depends upon its

Depth

Length

All of these

Shape

20.

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

Adhesion

Cohesion

Viscosity

Surface Tension

Page 3 of 4

21.

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 concave surface upward

rise with convex surface upward

22.

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

inversely proportional to rate of angular deformation

proportional to angular deformation

inversely proportional to angular deformation

proportional to rate of angular deformation

23.

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

Surface Tension

Capillarity

Cohesion

Viscosity

24.

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

2

1

4/3

0

25.

Pressure measured with the help of piezometer tube is

Absolute pressure

Atmospheric pressure

Gauge pressure

Vacuum pressure

26.

Surface Tension has the units of

None of these

Force per unit volume

Force per unit area

Force per unit length

27.

A Newtonian fluid is defined as the fluid which

is compressible and non-viscous

obey's Newton's law of viscosity

is incompressible and non viscous

is highly viscous

28.

Newton's law of viscosity depends upon the

Stress and strain in the fluid

Viscosity and shear stress

Shear stress, pressure and velocity

Shear stress and rate of strain

29.

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

Boyle's law

Pascal's law

Dalton's law

Newton's law

30.

An ideal fluid is defined as the fluid which

is compressible

is incompressible and non-viscous (inviscid)

is incompressible

has negligible surface tension

Page 4 of 4

31.

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

15 mm

50 mm

30 mm

20 mm

32.

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

0.981

9.81

98.1

981

33.

An ideal fluid is

one which obeys Newton's law of viscosity

frictionless and compressible

very viscous

frictionless and incompressible

34.

Capillarity is due to

Cohesion and adhesion both

adhesion of liquid particle to a surface

Cohesion of liquid particles

Surface tension

35.

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

All of these

Sudden head drop of inlet

Frictional loss head

Exit head drop

36.

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

37.

When subjected to shear force, a fluid

Deforms continuously no matter how smaller the shear stress may be

Deforms continuously only for small shear stresses

Deforms continuously only for large shear forces

Undergoes static deformation

38.

The viscosity of a gas

is independent of pressure for very high pressure intensities

decreases with increase in temperature

is independent of temperature

increases with increase in temperature

39.

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

W

W.h

h/W

W/h

40.

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

non-linear

uniform

incompressible

compressible

Fluid Mechanics MCQs Set-2

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