Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

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

very low vapour pressure

high density

low compressibility

negligible capillary effect

2.

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

15 mm

20 mm

30 mm

50 mm

3.

Kinematic viscosity (v) is equal to

ρ/μ

μ /ρ

μ x ρ

none of these

4.

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

proportional to angular deformation

inversely proportional to rate of angular deformation

inversely proportional to angular deformation

proportional to rate of angular deformation

5.

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

when the metacentre is below the centre of gravity

when its metacentric height is zero

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

when the metacentre is above the centre of gravity

6.

Atmosphere pressure head in terms of water column is

10.30 m

7.5 m

8.5 m

9.81 m

7.

The motion of air mass in a tornado is a

forced vortex motion

free vortex motion

forced vortex at centre and free vortex outside

free vortex at centre and forced vortex outside

8.

Newton's law of viscosity depends upon the

Viscosity and shear stress

Stress and strain in the fluid

Shear stress and rate of strain

Shear stress, pressure and velocity

9.

The increase of temperature

decreases the viscosity of a gas

decreases the viscosity of a liquid

increases the viscosity of a liquid

increases the viscosity of a gas

10.

An ideal fluid is defined as the fluid which

is compressible

is incompressible

is incompressible and non-viscous (inviscid)

has negligible surface tension

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11.

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

Newton's law

Pascal's law

Dalton's law

Boyle's law

12.

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

Velocity gradient parallel to the direction of flow

Shear gradient parallel to direction of flow

Shear gradient normal to the direction of flow

Velocity gradient normal to the direction of flow

13.

Pascal-second is the unit of

pressure

dynamic viscosity

surface tension

kinematic viscosity

14.

Capillarity is due to

Surface tension

adhesion of liquid particle to a surface

Cohesion and adhesion both

Cohesion of liquid particles

15.

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

In a fluid at rest

In a laminar flow

In a turbulent flow

In a liquid at rest

16.

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

17.

The unit of kinematic viscosity is

dyne-sec/cm²

gm/ cm-sec²

gm/cm²-sec

cm²/sec

18.

Hydrostatic pressure on a dam depends upon its

All of these

Depth

Length

Shape

19.

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

Vapour pressure

Surface tension

Bulk modulus of elasticity

Viscosity

20.

Stoke is the unit of

Viscosity

None of these

Surface Tension

Kinematic viscosity

Page 3 of 4

21.

An ideal fluid is

one which obeys Newton's law of viscosity

frictionless and compressible

frictionless and incompressible

very viscous

22.

Stream lines and path lines always coincide in case of

laminar flow

turbulent flow

uniform flow

steady flow

23.

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

uniform

incompressible

non-linear

compressible

24.

A Newtonian fluid is defined as the fluid which

is compressible and non-viscous

is incompressible and non viscous

is highly viscous

obey's Newton's law of viscosity

25.

Centre of buoyancy always

coincides with the centre of gravity

remains above the centre of gravity

coincides with the centroid of the volume of fluid displaced

remains below the centre of gravity

26.

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

W.h

h/W

W

W/h

27.

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

2σ / rγ

γσ / 2r

2σ / r

σ / 2rγ

28.

The viscosity of water is ___________than that of mercury.

zero

higher

infinity

lower

29.

Surface Tension has the units of

Force per unit length

None of these

Force per unit volume

Force per unit area

30.

When subjected to shear force, a fluid

Deforms continuously only for large shear forces

Deforms continuously only for small shear stresses

Undergoes static deformation

Deforms continuously no matter how smaller the shear stress may be

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31.

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

32.

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

Capillarity

Surface Tension

Viscosity

Cohesion

33.

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 shape of the containing vessel

The nature of the liquid

34.

In general, surface tension

increases with increase in temperature

decreases with increase of temperature

remains unaffected by temperature

remains unaffected by temperature up to critical temperature

35.

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

1

4/3

2

0

36.

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

98.1

0.981

9.81

981

37.

Pressure measured with the help of piezometer tube is

Atmospheric pressure

Absolute pressure

Gauge pressure

Vacuum pressure

38.

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

rise with convex surface upward

depress with concave surface upward

rise with concave surface upward

depress with convex surface upward

39.

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

Sudden head drop of inlet

All of these

Exit head drop

Frictional loss head

40.

A barometer is used to measure

Atmospheric pressure

Very high pressure

Pressure difference between two points

Very low pressure

Fluid Mechanics MCQs Set-2

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