Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

The viscosity of water is ___________than that of mercury.

zero

lower

infinity

higher

2.

Centre of buoyancy always

remains below the centre of gravity

coincides with the centre of gravity

coincides with the centroid of the volume of fluid displaced

remains above the centre of gravity

3.

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

non-linear

incompressible

compressible

uniform

4.

A barometer is used to measure

Atmospheric pressure

Pressure difference between two points

Very low pressure

Very high pressure

5.

Stoke is the unit of

Viscosity

None of these

Kinematic viscosity

Surface Tension

6.

Kinematic viscosity (v) is equal to

μ x ρ

ρ/μ

μ /ρ

none of these

7.

An ideal fluid is

very viscous

one which obeys Newton's law of viscosity

frictionless and incompressible

frictionless and compressible

8.

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

9.

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

Exit head drop

Frictional loss head

All of these

Sudden head drop of inlet

10.

The unit of kinematic viscosity is

dyne-sec/cm²

cm²/sec

gm/cm²-sec

gm/ cm-sec²

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11.

In general, surface tension

remains unaffected by temperature up to critical temperature

increases with increase in temperature

decreases with increase of temperature

remains unaffected by temperature

12.

Surface Tension has the units of

Force per unit volume

Force per unit length

None of these

Force per unit area

13.

Pascal-second is the unit of

pressure

dynamic viscosity

surface tension

kinematic viscosity

14.

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

Capillarity

Viscosity

Surface Tension

Cohesion

15.

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

16.

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

50 mm

15 mm

20 mm

30 mm

17.

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

4/3

1

2

0

18.

Capillarity is due to

Cohesion of liquid particles

adhesion of liquid particle to a surface

Cohesion and adhesion both

Surface tension

19.

Hydrostatic pressure on a dam depends upon its

Depth

Shape

Length

All of these

20.

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 nature of the liquid

The depth of the point below the surface of the liquid

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21.

An ideal fluid is defined as the fluid which

is incompressible and non-viscous (inviscid)

has negligible surface tension

is compressible

is incompressible

22.

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

Shear gradient parallel to direction of flow

Velocity gradient normal to the direction of flow

Velocity gradient parallel to the direction of flow

Shear gradient normal to the direction of flow

23.

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

Dalton's law

Newton's law

Pascal's law

Boyle's law

24.

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

In a laminar flow

In a fluid at rest

In a liquid at rest

In a turbulent flow

25.

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

depress with convex surface upward

rise with convex surface upward

depress with concave surface upward

rise with concave surface upward

26.

A Newtonian fluid is defined as the fluid which

is highly viscous

is compressible and non-viscous

obey's Newton's law of viscosity

is incompressible and non viscous

27.

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

inversely proportional to rate of angular deformation

proportional to rate of angular deformation

inversely proportional to angular deformation

proportional to angular deformation

28.

The viscosity of a gas

is independent of pressure for very high pressure intensities

decreases with increase in temperature

is independent of temperature

increases with increase in temperature

29.

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

98.1

0.981

9.81

981

30.

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

W.h

W/h

h/W

W

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31.

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

γσ / 2r

σ / 2rγ

2σ / rγ

2σ / r

32.

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

Vapour pressure

Viscosity

Bulk modulus of elasticity

Surface tension

33.

Stream lines and path lines always coincide in case of

laminar flow

uniform flow

steady flow

turbulent flow

34.

The increase of temperature

decreases the viscosity of a liquid

increases the viscosity of a gas

increases the viscosity of a liquid

decreases the viscosity of a gas

35.

Pressure measured with the help of piezometer tube is

Gauge pressure

Atmospheric pressure

Absolute pressure

Vacuum pressure

36.

Atmosphere pressure head in terms of water column is

7.5 m

10.30 m

8.5 m

9.81 m

37.

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

Adhesion

Surface Tension

Cohesion

Viscosity

38.

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

low compressibility

high density

very low vapour pressure

negligible capillary effect

39.

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

40.

The motion of air mass in a tornado is a

free vortex at centre and forced vortex outside

forced vortex motion

forced vortex at centre and free vortex outside

free vortex motion

Fluid Mechanics MCQs Set-2

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