Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

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

Viscosity

Cohesion

Capillarity

Surface Tension

2.

Stream lines and path lines always coincide in case of

steady flow

uniform flow

laminar flow

turbulent flow

3.

In general, surface tension

remains unaffected by temperature up to critical temperature

decreases with increase of temperature

remains unaffected by temperature

increases with increase in temperature

4.

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

4/3

2

1

0

5.

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

9.81

98.1

0.981

981

6.

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

7.

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

In a liquid at rest

In a laminar flow

In a turbulent flow

In a fluid at rest

8.

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

9.

The viscosity of a gas

decreases with increase in temperature

is independent of temperature

increases with increase in temperature

is independent of pressure for very high pressure intensities

10.

Stoke is the unit of

None of these

Viscosity

Kinematic viscosity

Surface Tension

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11.

A barometer is used to measure

Very low pressure

Pressure difference between two points

Very high pressure

Atmospheric pressure

12.

An ideal fluid is defined as the fluid which

is incompressible

is incompressible and non-viscous (inviscid)

is compressible

has negligible surface tension

13.

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

h/W

W/h

W

W.h

14.

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

All of these

Frictional loss head

Sudden head drop of inlet

Exit head drop

15.

Hydrostatic pressure on a dam depends upon its

All of these

Shape

Length

Depth

16.

Pascal-second is the unit of

dynamic viscosity

pressure

kinematic viscosity

surface tension

17.

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

18.

Kinematic viscosity (v) is equal to

ρ/μ

μ /ρ

none of these

μ x ρ

19.

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

when the metacentre is above the centre of gravity

when its metacentric height is zero

when the metacentre is below the centre of gravity

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

20.

The viscosity of water is ___________than that of mercury.

zero

infinity

lower

higher

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21.

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

30 mm

50 mm

15 mm

20 mm

22.

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

Shear gradient normal to the direction of flow

Velocity gradient normal to the direction of flow

23.

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

Adhesion

Viscosity

Surface Tension

Cohesion

24.

Surface Tension has the units of

Force per unit area

None of these

Force per unit length

Force per unit volume

25.

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

Pascal's law

Boyle's law

Dalton's law

Newton's law

26.

Capillarity is due to

Cohesion and adhesion both

Cohesion of liquid particles

Surface tension

adhesion of liquid particle to a surface

27.

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

proportional to rate of angular deformation

inversely proportional to angular deformation

inversely proportional to rate of angular deformation

proportional to angular deformation

28.

An ideal fluid is

one which obeys Newton's law of viscosity

frictionless and incompressible

frictionless and compressible

very viscous

29.

The motion of air mass in a tornado is a

free vortex motion

forced vortex at centre and free vortex outside

free vortex at centre and forced vortex outside

forced vortex motion

30.

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

compressible

uniform

incompressible

non-linear

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31.

The unit of kinematic viscosity is

cm²/sec

gm/cm²-sec

gm/ cm-sec²

dyne-sec/cm²

32.

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

33.

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 acceleration due to gravity at that point

The shape of the containing vessel

34.

A Newtonian fluid is defined as the fluid which

is compressible and non-viscous

is incompressible and non viscous

obey's Newton's law of viscosity

is highly viscous

35.

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

Vapour pressure

Viscosity

Surface tension

Bulk modulus of elasticity

36.

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

low compressibility

negligible capillary effect

very low vapour pressure

high density

37.

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

38.

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

39.

Atmosphere pressure head in terms of water column is

7.5 m

10.30 m

8.5 m

9.81 m

40.

Pressure measured with the help of piezometer tube is

Atmospheric pressure

Vacuum pressure

Gauge pressure

Absolute pressure

Fluid Mechanics MCQs Set-2

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