Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

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

W/h

W.h

W

h/W

2.

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

3.

Kinematic viscosity (v) is equal to

none of these

μ /ρ

ρ/μ

μ x ρ

4.

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

Capillarity

Surface Tension

Viscosity

Cohesion

5.

Centre of buoyancy always

coincides with the centroid of the volume of fluid displaced

remains below the centre of gravity

remains above the centre of gravity

coincides with the centre of gravity

6.

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

depress with concave surface upward

rise with concave surface upward

rise with convex surface upward

depress with convex surface upward

7.

Pascal-second is the unit of

pressure

dynamic viscosity

kinematic viscosity

surface tension

8.

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

when its metacentric height is zero

when the metacentre is above the centre of gravity

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

when the metacentre is below the centre of gravity

9.

When subjected to shear force, a fluid

Deforms continuously only for large shear forces

Undergoes static deformation

Deforms continuously no matter how smaller the shear stress may be

Deforms continuously only for small shear stresses

10.

Atmosphere pressure head in terms of water column is

10.30 m

9.81 m

7.5 m

8.5 m

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11.

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

50 mm

20 mm

30 mm

15 mm

12.

Surface Tension has the units of

Force per unit length

Force per unit volume

None of these

Force per unit area

13.

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

Frictional loss head

Exit head drop

All of these

Sudden head drop of inlet

14.

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

Dalton's law

Pascal's law

Boyle's law

Newton's law

15.

An ideal fluid is defined as the fluid which

has negligible surface tension

is compressible

is incompressible and non-viscous (inviscid)

is incompressible

16.

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

17.

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

In a laminar flow

In a liquid at rest

In a fluid at rest

In a turbulent flow

18.

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

Viscosity

Cohesion

Surface Tension

Adhesion

19.

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

9.81

98.1

0.981

981

20.

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

γσ / 2r

2σ / rγ

σ / 2rγ

2σ / r

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21.

Newton's law of viscosity depends upon the

Shear stress, pressure and velocity

Viscosity and shear stress

Stress and strain in the fluid

Shear stress and rate of strain

22.

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

2

1

4/3

0

23.

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

Vapour pressure

Viscosity

Surface tension

Bulk modulus of elasticity

24.

Capillarity is due to

Cohesion and adhesion both

Cohesion of liquid particles

Surface tension

adhesion of liquid particle to a surface

25.

The unit of kinematic viscosity is

gm/cm²-sec

gm/ cm-sec²

dyne-sec/cm²

cm²/sec

26.

An ideal fluid is

frictionless and compressible

one which obeys Newton's law of viscosity

very viscous

frictionless and incompressible

27.

The motion of air mass in a tornado is a

forced vortex at centre and free vortex outside

free vortex at centre and forced vortex outside

forced vortex motion

free vortex motion

28.

A barometer is used to measure

Very low pressure

Pressure difference between two points

Very high pressure

Atmospheric pressure

29.

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

inversely proportional to rate of angular deformation

inversely proportional to angular deformation

proportional to angular deformation

proportional to rate of angular deformation

30.

Hydrostatic pressure on a dam depends upon its

Depth

Length

All of these

Shape

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31.

In general, surface tension

decreases with increase of temperature

remains unaffected by temperature up to critical temperature

remains unaffected by temperature

increases with increase in temperature

32.

Stream lines and path lines always coincide in case of

steady flow

uniform flow

turbulent flow

laminar flow

33.

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

low compressibility

very low vapour pressure

negligible capillary effect

high density

34.

Pressure at a point inside a liquid does not depend on

The shape of the containing vessel

The acceleration due to gravity at that point

The depth of the point below the surface of the liquid

The nature of the liquid

35.

The increase of temperature

decreases the viscosity of a liquid

increases the viscosity of a liquid

increases the viscosity of a gas

decreases the viscosity of a gas

36.

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

incompressible

non-linear

compressible

uniform

37.

Stoke is the unit of

Kinematic viscosity

Viscosity

Surface Tension

None of these

38.

The viscosity of water is ___________than that of mercury.

lower

zero

higher

infinity

39.

Pressure measured with the help of piezometer tube is

Absolute pressure

Atmospheric pressure

Gauge pressure

Vacuum pressure

40.

A Newtonian fluid is defined as the fluid which

obey's Newton's law of viscosity

is highly viscous

is incompressible and non viscous

is compressible and non-viscous

Fluid Mechanics MCQs Set-2

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