Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

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

2.

Pascal-second is the unit of

kinematic viscosity

surface tension

pressure

dynamic viscosity

3.

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

when the metacentre is above the centre of gravity

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

when its metacentric height is zero

when the metacentre is below the centre of gravity

4.

Stoke is the unit of

Surface Tension

None of these

Kinematic viscosity

Viscosity

5.

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

depress with convex surface upward

depress with concave surface upward

rise with convex surface upward

rise with concave surface upward

6.

An ideal fluid is

one which obeys Newton's law of viscosity

frictionless and compressible

very viscous

frictionless and incompressible

7.

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

Frictional loss head

Sudden head drop of inlet

All of these

Exit head drop

8.

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

Surface Tension

Capillarity

Cohesion

Viscosity

9.

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

50 mm

30 mm

15 mm

20 mm

10.

Pressure measured with the help of piezometer tube is

Gauge pressure

Vacuum pressure

Absolute pressure

Atmospheric pressure

Page 2 of 4

11.

Surface Tension has the units of

Force per unit volume

None of these

Force per unit area

Force per unit length

12.

Atmosphere pressure head in terms of water column is

8.5 m

10.30 m

7.5 m

9.81 m

13.

The viscosity of water is ___________than that of mercury.

infinity

higher

lower

zero

14.

The unit of kinematic viscosity is

dyne-sec/cm²

gm/ cm-sec²

cm²/sec

gm/cm²-sec

15.

Kinematic viscosity (v) is equal to

ρ/μ

none of these

μ /ρ

μ x ρ

16.

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

h/W

W.h

W

W/h

17.

The viscosity of a gas

is independent of temperature

is independent of pressure for very high pressure intensities

increases with increase in temperature

decreases with increase in temperature

18.

Capillarity is due to

Surface tension

Cohesion of liquid particles

Cohesion and adhesion both

adhesion of liquid particle to a surface

19.

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

20.

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

Boyle's law

Dalton's law

Pascal's law

Newton's law

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21.

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

In a turbulent flow

In a laminar flow

In a liquid at rest

In a fluid at rest

22.

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

23.

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

24.

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

Adhesion

Cohesion

Surface Tension

Viscosity

25.

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

1

0

4/3

2

26.

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

98.1

9.81

0.981

981

27.

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

compressible

uniform

non-linear

incompressible

28.

A Newtonian fluid is defined as the fluid which

is incompressible and non viscous

obey's Newton's law of viscosity

is highly viscous

is compressible and non-viscous

29.

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

30.

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

high density

very low vapour pressure

negligible capillary effect

low compressibility

Page 4 of 4

31.

Stream lines and path lines always coincide in case of

steady flow

laminar flow

turbulent flow

uniform flow

32.

Centre of buoyancy always

remains above the centre of gravity

coincides with the centroid of the volume of fluid displaced

coincides with the centre of gravity

remains below the centre of gravity

33.

Hydrostatic pressure on a dam depends upon its

Depth

All of these

Shape

Length

34.

An ideal fluid is defined as the fluid which

has negligible surface tension

is incompressible and non-viscous (inviscid)

is incompressible

is compressible

35.

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

Shear gradient parallel to direction of flow

Shear gradient normal to the direction of flow

Velocity gradient normal to the direction of flow

Velocity gradient parallel to the direction of flow

36.

A barometer is used to measure

Atmospheric pressure

Very high pressure

Very low pressure

Pressure difference between two points

37.

When subjected to shear force, a fluid

Deforms continuously only for large shear forces

Deforms continuously only for small shear stresses

Deforms continuously no matter how smaller the shear stress may be

Undergoes static deformation

38.

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

39.

Newton's law of viscosity depends upon the

Viscosity and shear stress

Stress and strain in the fluid

Shear stress, pressure and velocity

Shear stress and rate of strain

40.

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

Surface tension

Bulk modulus of elasticity

Viscosity

Vapour pressure

Fluid Mechanics MCQs Set-2

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