Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

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 convex surface upward

rise with concave surface upward

depress with convex surface upward

2.

The unit of kinematic viscosity is

cm²/sec

gm/cm²-sec

dyne-sec/cm²

gm/ cm-sec²

3.

In general, surface tension

increases with increase in temperature

remains unaffected by temperature

decreases with increase of temperature

remains unaffected by temperature up to critical temperature

4.

The viscosity of a gas

decreases with increase in temperature

is independent of pressure for very high pressure intensities

is independent of temperature

increases with increase in temperature

5.

Capillarity is due to

Cohesion of liquid particles

adhesion of liquid particle to a surface

Cohesion and adhesion both

Surface tension

6.

Stream lines and path lines always coincide in case of

steady flow

uniform flow

turbulent flow

laminar flow

7.

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

Bulk modulus of elasticity

Viscosity

Vapour pressure

Surface tension

8.

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

Viscosity

Surface Tension

Cohesion

Capillarity

9.

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

Pascal's law

Boyle's law

Newton's law

Dalton's law

10.

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

γσ / 2r

2σ / rγ

2σ / r

σ / 2rγ

Page 2 of 4

11.

The viscosity of water is ___________than that of mercury.

higher

infinity

lower

zero

12.

An ideal fluid is

frictionless and incompressible

one which obeys Newton's law of viscosity

very viscous

frictionless and compressible

13.

Centre of buoyancy always

coincides with the centroid of the volume of fluid displaced

remains above the centre of gravity

coincides with the centre of gravity

remains below the centre of gravity

14.

Stoke is the unit of

Viscosity

Surface Tension

None of these

Kinematic viscosity

15.

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

9.81

98.1

0.981

981

16.

Kinematic viscosity (v) is equal to

none of these

μ x ρ

ρ/μ

μ /ρ

17.

When subjected to shear force, a fluid

Deforms continuously only for small shear stresses

Deforms continuously no matter how smaller the shear stress may be

Undergoes static deformation

Deforms continuously only for large shear forces

18.

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

Sudden head drop of inlet

Exit head drop

All of these

Frictional loss head

19.

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

20.

Pascal-second is the unit of

pressure

dynamic viscosity

surface tension

kinematic viscosity

Page 3 of 4

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.

Newton's law of viscosity depends upon the

Shear stress, pressure and velocity

Stress and strain in the fluid

Viscosity and shear stress

Shear stress and rate of strain

23.

Hydrostatic pressure on a dam depends upon its

Depth

Length

All of these

Shape

24.

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

In a fluid at rest

In a liquid at rest

In a laminar flow

In a turbulent flow

25.

Pressure at a point inside a liquid does not depend on

The acceleration due to gravity at that point

The depth of the point below the surface of the liquid

The shape of the containing vessel

The nature of the liquid

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.

Atmosphere pressure head in terms of water column is

9.81 m

7.5 m

8.5 m

10.30 m

28.

The increase of temperature

decreases the viscosity of a gas

increases the viscosity of a liquid

increases the viscosity of a gas

decreases the viscosity of a liquid

29.

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

when its metacentric height is zero

when the metacentre is below the centre of gravity

when the metacentre is above the centre of gravity

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

30.

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

free vortex motion

forced vortex motion

Page 4 of 4

31.

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

inversely proportional to rate of angular deformation

proportional to angular deformation

inversely proportional to angular deformation

proportional to rate of angular deformation

32.

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

W/h

W.h

h/W

W

33.

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

Cohesion

Adhesion

Surface Tension

Viscosity

34.

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

1

4/3

2

0

35.

A barometer is used to measure

Very low pressure

Very high pressure

Pressure difference between two points

Atmospheric pressure

36.

Pressure measured with the help of piezometer tube is

Gauge pressure

Vacuum pressure

Absolute pressure

Atmospheric pressure

37.

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

non-linear

uniform

compressible

incompressible

38.

Surface Tension has the units of

Force per unit volume

Force per unit area

Force per unit length

None of these

39.

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

very low vapour pressure

low compressibility

high density

negligible capillary effect

40.

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

Velocity gradient normal to the direction of flow

Shear gradient parallel to direction of flow

Shear gradient normal to the direction of flow

Velocity gradient parallel to the direction of flow

Fluid Mechanics MCQs Set-2

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