Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

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

In a liquid at rest

In a turbulent flow

In a laminar flow

In a fluid at rest

2.

Pressure at a point inside a liquid does not depend on

The nature of the liquid

The acceleration due to gravity at that point

The shape of the containing vessel

The depth of the point below the surface of the liquid

3.

Pascal-second is the unit of

surface tension

pressure

dynamic viscosity

kinematic viscosity

4.

Surface Tension has the units of

Force per unit length

None of these

Force per unit volume

Force per unit area

5.

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

non-linear

compressible

incompressible

uniform

6.

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

1

2

0

4/3

7.

Atmosphere pressure head in terms of water column is

8.5 m

9.81 m

10.30 m

7.5 m

8.

The motion of air mass in a tornado is a

free vortex at centre and forced vortex outside

forced vortex at centre and free vortex outside

free vortex motion

forced vortex motion

9.

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

Sudden head drop of inlet

All of these

Exit head drop

Frictional loss head

10.

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

negligible capillary effect

very low vapour pressure

high density

low compressibility

Page 2 of 4

11.

Kinematic viscosity (v) is equal to

ρ/μ

μ x ρ

μ /ρ

none of these

12.

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

depress with convex surface upward

rise with concave surface upward

13.

Stream lines and path lines always coincide in case of

steady flow

uniform flow

laminar flow

turbulent flow

14.

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

Pascal's law

Newton's law

Boyle's law

Dalton's law

15.

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

0.981

98.1

981

9.81

16.

Pressure measured with the help of piezometer tube is

Gauge pressure

Vacuum pressure

Atmospheric pressure

Absolute pressure

17.

When subjected to shear force, a fluid

Undergoes static deformation

Deforms continuously only for small shear stresses

Deforms continuously no matter how smaller the shear stress may be

Deforms continuously only for large shear forces

18.

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

W.h

W

W/h

h/W

19.

Centre of buoyancy always

coincides with the centre of gravity

remains above the centre of gravity

coincides with the centroid of the volume of fluid displaced

remains below the centre of gravity

20.

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

50 mm

15 mm

30 mm

20 mm

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21.

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

when its metacentric height is zero

when the metacentre is above the centre of gravity

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

when the metacentre is below the centre of gravity

22.

The unit of kinematic viscosity is

dyne-sec/cm²

cm²/sec

gm/ cm-sec²

gm/cm²-sec

23.

Stoke is the unit of

Viscosity

Surface Tension

None of these

Kinematic viscosity

24.

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

25.

The increase of temperature

increases the viscosity of a liquid

increases the viscosity of a gas

decreases the viscosity of a liquid

decreases the viscosity of a gas

26.

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

σ / 2rγ

γσ / 2r

2σ / rγ

2σ / r

27.

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

Viscosity

Adhesion

Surface Tension

Cohesion

28.

The viscosity of a gas

is independent of temperature

increases with increase in temperature

decreases with increase in temperature

is independent of pressure for very high pressure intensities

29.

In general, surface tension

decreases with increase of temperature

increases with increase in temperature

remains unaffected by temperature up to critical temperature

remains unaffected by temperature

30.

An ideal fluid is

very viscous

one which obeys Newton's law of viscosity

frictionless and compressible

frictionless and incompressible

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31.

An ideal fluid is defined as the fluid which

has negligible surface tension

is incompressible and non-viscous (inviscid)

is compressible

is incompressible

32.

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

33.

Capillarity is due to

Cohesion and adhesion both

Surface tension

adhesion of liquid particle to a surface

Cohesion of liquid particles

34.

The viscosity of water is ___________than that of mercury.

lower

higher

infinity

zero

35.

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

Surface Tension

Viscosity

Cohesion

Capillarity

36.

A barometer is used to measure

Pressure difference between two points

Atmospheric pressure

Very low pressure

Very high pressure

37.

Hydrostatic pressure on a dam depends upon its

All of these

Length

Shape

Depth

38.

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

Velocity gradient normal to the direction of flow

Velocity gradient parallel to the direction of flow

Shear gradient parallel to direction of flow

Shear gradient normal to the direction of flow

39.

Newton's law of viscosity depends upon the

Shear stress, pressure and velocity

Shear stress and rate of strain

Stress and strain in the fluid

Viscosity and shear stress

40.

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

Vapour pressure

Bulk modulus of elasticity

Viscosity

Surface tension

Fluid Mechanics MCQs Set-2

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