Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

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

inversely proportional to angular deformation

proportional to angular deformation

proportional to rate of angular deformation

inversely proportional to rate of angular deformation

2.

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 concave surface upward

rise with convex surface upward

depress with convex surface upward

3.

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 the metacentre is below the centre of gravity

when its metacentric height is zero

4.

In general, surface tension

remains unaffected by temperature up to critical temperature

remains unaffected by temperature

decreases with increase of temperature

increases with increase in temperature

5.

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

15 mm

30 mm

50 mm

20 mm

6.

The motion of air mass in a tornado is a

forced vortex motion

free vortex at centre and forced vortex outside

free vortex motion

forced vortex at centre and free vortex outside

7.

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

Capillarity

Surface Tension

Cohesion

Viscosity

8.

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

Vapour pressure

Viscosity

Surface tension

Bulk modulus of elasticity

9.

A Newtonian fluid is defined as the fluid which

is incompressible and non viscous

is highly viscous

obey's Newton's law of viscosity

is compressible and non-viscous

10.

An ideal fluid is

very viscous

frictionless and incompressible

one which obeys Newton's law of viscosity

frictionless and compressible

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11.

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

W/h

W.h

h/W

W

12.

Centre of buoyancy always

coincides with the centroid of the volume of fluid displaced

remains above the centre of gravity

remains below the centre of gravity

coincides with the centre of gravity

13.

Newton's law of viscosity depends upon the

Stress and strain in the fluid

Viscosity and shear stress

Shear stress and rate of strain

Shear stress, pressure and velocity

14.

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

γσ / 2r

2σ / r

σ / 2rγ

2σ / rγ

15.

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

0.981

981

9.81

98.1

16.

Stoke is the unit of

Kinematic viscosity

Surface Tension

Viscosity

None of these

17.

Hydrostatic pressure on a dam depends upon its

All of these

Shape

Length

Depth

18.

Capillarity is due to

Cohesion of liquid particles

Surface tension

adhesion of liquid particle to a surface

Cohesion and adhesion both

19.

An ideal fluid is defined as the fluid which

is compressible

has negligible surface tension

is incompressible

is incompressible and non-viscous (inviscid)

20.

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

Newton's law

Pascal's law

Dalton's law

Boyle's law

Page 3 of 4

21.

The viscosity of water is ___________than that of mercury.

zero

lower

infinity

higher

22.

The viscosity of a gas

is independent of temperature

increases with increase in temperature

is independent of pressure for very high pressure intensities

decreases with increase in temperature

23.

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

Cohesion

Adhesion

Viscosity

Surface Tension

24.

A barometer is used to measure

Atmospheric pressure

Very high pressure

Very low pressure

Pressure difference between two points

25.

Pressure at a point inside a liquid does not depend on

The depth of the point below the surface of the liquid

The nature of the liquid

The shape of the containing vessel

The acceleration due to gravity at that point

26.

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

All of these

Sudden head drop of inlet

Exit head drop

Frictional loss head

27.

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

Shear gradient parallel to direction of flow

Velocity gradient parallel to the direction of flow

Velocity gradient normal to the direction of flow

Shear gradient normal to the direction of flow

28.

Surface Tension has the units of

Force per unit volume

Force per unit length

None of these

Force per unit area

29.

Pascal-second is the unit of

pressure

kinematic viscosity

surface tension

dynamic viscosity

30.

The increase of temperature

increases the viscosity of a liquid

decreases the viscosity of a liquid

increases the viscosity of a gas

decreases the viscosity of a gas

Page 4 of 4

31.

Pressure measured with the help of piezometer tube is

Gauge pressure

Atmospheric pressure

Absolute pressure

Vacuum pressure

32.

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

33.

The unit of kinematic viscosity is

dyne-sec/cm²

gm/ cm-sec²

gm/cm²-sec

cm²/sec

34.

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

0

2

4/3

1

35.

Kinematic viscosity (v) is equal to

ρ/μ

μ /ρ

μ x ρ

none of these

36.

Stream lines and path lines always coincide in case of

uniform flow

laminar flow

turbulent flow

steady flow

37.

Atmosphere pressure head in terms of water column is

9.81 m

7.5 m

8.5 m

10.30 m

38.

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

high density

negligible capillary effect

very low vapour pressure

low compressibility

39.

When subjected to shear force, a fluid

Deforms continuously no matter how smaller the shear stress may be

Deforms continuously only for large shear forces

Deforms continuously only for small shear stresses

Undergoes static deformation

40.

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

uniform

incompressible

compressible

non-linear

Fluid Mechanics MCQs Set-2

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