Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

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

compressible

non-linear

uniform

incompressible

2.

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

0.981

981

98.1

9.81

3.

Stream lines and path lines always coincide in case of

uniform flow

steady flow

laminar flow

turbulent flow

4.

An ideal fluid is

frictionless and incompressible

very viscous

frictionless and compressible

one which obeys Newton's law of viscosity

5.

The increase of temperature

decreases the viscosity of a liquid

increases the viscosity of a liquid

decreases the viscosity of a gas

increases the viscosity of a gas

6.

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

Velocity gradient normal to the direction of flow

Shear gradient normal to the direction of flow

7.

The viscosity of water is ___________than that of mercury.

infinity

higher

zero

lower

8.

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

4/3

0

1

2

9.

Pressure measured with the help of piezometer tube is

Gauge pressure

Absolute pressure

Vacuum pressure

Atmospheric pressure

10.

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

negligible capillary effect

very low vapour pressure

low compressibility

high density

Page 2 of 4

11.

Kinematic viscosity (v) is equal to

μ x ρ

ρ/μ

none of these

μ /ρ

12.

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

Vapour pressure

Surface tension

Viscosity

Bulk modulus of elasticity

13.

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

15 mm

20 mm

50 mm

30 mm

14.

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 depth of the point below the surface of the liquid

The nature of the liquid

15.

Stoke is the unit of

Viscosity

Surface Tension

None of these

Kinematic viscosity

16.

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

17.

A barometer is used to measure

Very low pressure

Pressure difference between two points

Very high pressure

Atmospheric pressure

18.

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

Exit head drop

All of these

Sudden head drop of inlet

Frictional loss head

19.

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

In a laminar flow

In a turbulent flow

In a liquid at rest

In a fluid at rest

20.

Atmosphere pressure head in terms of water column is

9.81 m

7.5 m

8.5 m

10.30 m

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21.

A Newtonian fluid is defined as the fluid which

is compressible and non-viscous

is highly viscous

is incompressible and non viscous

obey's Newton's law of viscosity

22.

The unit of kinematic viscosity is

dyne-sec/cm²

cm²/sec

gm/cm²-sec

gm/ cm-sec²

23.

Pascal-second is the unit of

dynamic viscosity

kinematic viscosity

pressure

surface tension

24.

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

Viscosity

Adhesion

Cohesion

Surface Tension

25.

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

when its metacentric height is zero

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

when the metacentre is below the centre of gravity

when the metacentre is above the centre of gravity

26.

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

W/h

h/W

W

W.h

27.

Capillarity is due to

Surface tension

adhesion of liquid particle to a surface

Cohesion and adhesion both

Cohesion of liquid particles

28.

In general, surface tension

increases with increase in temperature

remains unaffected by temperature

remains unaffected by temperature up to critical temperature

decreases with increase of temperature

29.

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

Capillarity

Cohesion

Surface Tension

Viscosity

30.

The viscosity of a gas

is independent of pressure for very high pressure intensities

decreases with increase in temperature

increases with increase in temperature

is independent of temperature

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31.

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

σ / 2rγ

2σ / rγ

2σ / r

γσ / 2r

32.

The motion of air mass in a tornado is a

forced vortex motion

free vortex motion

free vortex at centre and forced vortex outside

forced vortex at centre and free vortex outside

33.

Hydrostatic pressure on a dam depends upon its

Length

Depth

Shape

All of these

34.

Newton's law of viscosity depends upon the

Shear stress, pressure and velocity

Stress and strain in the fluid

Shear stress and rate of strain

Viscosity and shear stress

35.

An ideal fluid is defined as the fluid which

is incompressible and non-viscous (inviscid)

is compressible

is incompressible

has negligible surface tension

36.

Surface Tension has the units of

None of these

Force per unit area

Force per unit length

Force per unit volume

37.

When subjected to shear force, a fluid

Undergoes static deformation

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

38.

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

inversely proportional to angular deformation

proportional to angular deformation

proportional to rate of angular deformation

inversely proportional to rate of angular deformation

39.

Centre of buoyancy always

coincides with the centre of gravity

remains below the centre of gravity

remains above the centre of gravity

coincides with the centroid of the volume of fluid displaced

40.

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

Boyle's law

Dalton's law

Pascal's law

Newton's law

Fluid Mechanics MCQs Set-2

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