Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

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

Velocity gradient normal to the direction of flow

Shear gradient normal to the direction of flow

Velocity gradient parallel to the direction of flow

Shear gradient parallel to direction of flow

2.

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

Surface Tension

Cohesion

Viscosity

Capillarity

3.

Kinematic viscosity (v) is equal to

μ x ρ

ρ/μ

μ /ρ

none of these

4.

An ideal fluid is defined as the fluid which

is incompressible

is compressible

is incompressible and non-viscous (inviscid)

has negligible surface tension

5.

Capillarity is due to

Surface tension

Cohesion and adhesion both

Cohesion of liquid particles

adhesion of liquid particle to a surface

6.

Surface Tension has the units of

Force per unit volume

Force per unit length

Force per unit area

None of these

7.

The viscosity of water is ___________than that of mercury.

zero

lower

infinity

higher

8.

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

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

when the metacentre is above the centre of gravity

when its metacentric height is zero

when the metacentre is below the centre of gravity

9.

Centre of buoyancy always

remains above the centre of gravity

coincides with the centre of gravity

remains below the centre of gravity

coincides with the centroid of the volume of fluid displaced

10.

A barometer is used to measure

Atmospheric pressure

Pressure difference between two points

Very low pressure

Very high pressure

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11.

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

W/h

W

W.h

h/W

12.

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

Newton's law

Pascal's law

Dalton's law

Boyle's law

13.

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

30 mm

15 mm

20 mm

50 mm

14.

An ideal fluid is

one which obeys Newton's law of viscosity

frictionless and compressible

very viscous

frictionless and incompressible

15.

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

low compressibility

very low vapour pressure

negligible capillary effect

high density

16.

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

In a laminar flow

In a turbulent flow

In a fluid at rest

In a liquid at rest

17.

Stream lines and path lines always coincide in case of

steady flow

turbulent flow

laminar flow

uniform flow

18.

The unit of kinematic viscosity is

dyne-sec/cm²

gm/ cm-sec²

cm²/sec

gm/cm²-sec

19.

In general, surface tension

decreases with increase of temperature

remains unaffected by temperature

remains unaffected by temperature up to critical temperature

increases with increase in temperature

20.

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

inversely proportional to angular deformation

inversely proportional to rate of angular deformation

proportional to rate of angular deformation

proportional to angular deformation

Page 3 of 4

21.

Pressure measured with the help of piezometer tube is

Gauge pressure

Vacuum pressure

Absolute pressure

Atmospheric pressure

22.

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

4/3

0

2

1

23.

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

24.

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

Viscosity

Surface Tension

Cohesion

Adhesion

25.

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

Surface tension

Viscosity

Vapour pressure

Bulk modulus of elasticity

26.

Hydrostatic pressure on a dam depends upon its

Depth

All of these

Length

Shape

27.

The motion of air mass in a tornado is a

forced vortex motion

forced vortex at centre and free vortex outside

free vortex at centre and forced vortex outside

free vortex motion

28.

Pressure at a point inside a liquid does not depend on

The acceleration due to gravity at that point

The nature of the liquid

The shape of the containing vessel

The depth of the point below the surface of the liquid

29.

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

30.

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

non-linear

uniform

incompressible

compressible

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31.

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

rise with concave surface upward

depress with convex surface upward

depress with concave surface upward

rise with convex surface upward

32.

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

981

98.1

0.981

9.81

33.

Newton's law of viscosity depends upon the

Viscosity and shear stress

Stress and strain in the fluid

Shear stress, pressure and velocity

Shear stress and rate of strain

34.

Stoke is the unit of

None of these

Surface Tension

Viscosity

Kinematic viscosity

35.

The increase of temperature

increases the viscosity of a gas

decreases the viscosity of a gas

decreases the viscosity of a liquid

increases the viscosity of a liquid

36.

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

Frictional loss head

All of these

Sudden head drop of inlet

Exit head drop

37.

Atmosphere pressure head in terms of water column is

10.30 m

7.5 m

9.81 m

8.5 m

38.

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

γσ / 2r

2σ / r

2σ / rγ

σ / 2rγ

39.

Pascal-second is the unit of

kinematic viscosity

surface tension

pressure

dynamic viscosity

40.

The viscosity of a gas

decreases with increase in temperature

is independent of temperature

is independent of pressure for very high pressure intensities

increases with increase in temperature

Fluid Mechanics MCQs Set-2

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