Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

Stream lines and path lines always coincide in case of

steady flow

laminar flow

turbulent flow

uniform flow

2.

The unit of kinematic viscosity is

cm²/sec

gm/cm²-sec

gm/ cm-sec²

dyne-sec/cm²

3.

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

4.

An ideal fluid is

very viscous

frictionless and incompressible

one which obeys Newton's law of viscosity

frictionless and compressible

5.

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

15 mm

30 mm

20 mm

50 mm

6.

Surface Tension has the units of

Force per unit area

Force per unit volume

None of these

Force per unit length

7.

The viscosity of water is ___________than that of mercury.

infinity

higher

lower

zero

8.

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

σ / 2rγ

γσ / 2r

2σ / r

2σ / rγ

9.

Pascal-second is the unit of

pressure

kinematic viscosity

dynamic viscosity

surface tension

10.

Hydrostatic pressure on a dam depends upon its

Length

Shape

Depth

All of these

Page 2 of 4

11.

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

1

0

4/3

2

12.

The motion of air mass in a tornado is a

forced vortex motion

free vortex at centre and forced vortex outside

forced vortex at centre and free vortex outside

free vortex motion

13.

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

14.

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

h/W

W/h

W

W.h

15.

A barometer is used to measure

Very high pressure

Very low pressure

Atmospheric pressure

Pressure difference between two points

16.

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

98.1

0.981

9.81

981

17.

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

Vapour pressure

Viscosity

Surface tension

Bulk modulus of elasticity

18.

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

very low vapour pressure

high density

low compressibility

negligible capillary effect

19.

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

20.

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

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

when the metacentre is above the centre of gravity

Page 3 of 4

21.

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

In a laminar flow

In a turbulent flow

In a fluid at rest

In a liquid at rest

22.

Pressure measured with the help of piezometer tube is

Vacuum pressure

Absolute pressure

Atmospheric pressure

Gauge pressure

23.

A Newtonian fluid is defined as the fluid which

is incompressible and non viscous

is highly viscous

obey's Newton's law of viscosity

is compressible and non-viscous

24.

The viscosity of a gas

increases with increase in temperature

decreases with increase in temperature

is independent of pressure for very high pressure intensities

is independent of temperature

25.

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

inversely proportional to angular deformation

proportional to rate of angular deformation

inversely proportional to rate of angular deformation

proportional to angular deformation

26.

In general, surface tension

remains unaffected by temperature

remains unaffected by temperature up to critical temperature

increases with increase in temperature

decreases with increase of temperature

27.

Capillarity is due to

Surface tension

adhesion of liquid particle to a surface

Cohesion and adhesion both

Cohesion of liquid particles

28.

Newton's law of viscosity depends upon the

Viscosity and shear stress

Shear stress, pressure and velocity

Stress and strain in the fluid

Shear stress and rate of strain

29.

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

Exit head drop

All of these

Frictional loss head

Sudden head drop of inlet

30.

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

Dalton's law

Boyle's law

Newton's law

Pascal's law

Page 4 of 4

31.

Atmosphere pressure head in terms of water column is

9.81 m

10.30 m

8.5 m

7.5 m

32.

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

uniform

non-linear

incompressible

compressible

33.

Stoke is the unit of

Viscosity

None of these

Surface Tension

Kinematic viscosity

34.

Kinematic viscosity (v) is equal to

none of these

μ x ρ

μ /ρ

ρ/μ

35.

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

36.

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

37.

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

Cohesion

Surface Tension

Viscosity

Adhesion

38.

An ideal fluid is defined as the fluid which

is compressible

is incompressible and non-viscous (inviscid)

has negligible surface tension

is incompressible

39.

Centre of buoyancy always

remains above the centre of gravity

remains below the centre of gravity

coincides with the centroid of the volume of fluid displaced

coincides with the centre of gravity

40.

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

Cohesion

Surface Tension

Viscosity

Capillarity

Fluid Mechanics MCQs Set-2

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