Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

Hydrostatic pressure on a dam depends upon its

Shape

All of these

Length

Depth

2.

Newton's law of viscosity depends upon the

Shear stress and rate of strain

Stress and strain in the fluid

Shear stress, pressure and velocity

Viscosity and shear stress

3.

Stoke is the unit of

Viscosity

None of these

Surface Tension

Kinematic viscosity

4.

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

5.

Pascal-second is the unit of

kinematic viscosity

dynamic viscosity

pressure

surface tension

6.

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

incompressible

non-linear

compressible

uniform

7.

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

0

2

1

4/3

8.

The motion of air mass in a tornado is a

free vortex motion

forced vortex motion

forced vortex at centre and free vortex outside

free vortex at centre and forced vortex outside

9.

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

Newton's law

Pascal's law

Dalton's law

Boyle's law

10.

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

Cohesion

Capillarity

Viscosity

Surface Tension

Page 2 of 4

11.

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

30 mm

20 mm

15 mm

50 mm

12.

Pressure measured with the help of piezometer tube is

Vacuum pressure

Gauge pressure

Absolute pressure

Atmospheric pressure

13.

Surface Tension has the units of

None of these

Force per unit area

Force per unit volume

Force per unit length

14.

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

proportional to angular deformation

inversely proportional to angular deformation

proportional to rate of angular deformation

inversely proportional to rate of angular deformation

15.

An ideal fluid is

one which obeys Newton's law of viscosity

frictionless and incompressible

frictionless and compressible

very viscous

16.

Pressure at a point inside a liquid does not depend on

The nature of the liquid

The shape of the containing vessel

The depth of the point below the surface of the liquid

The acceleration due to gravity at that point

17.

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

Shear gradient parallel to direction of flow

Velocity gradient normal to the direction of flow

Velocity gradient parallel to the direction of flow

Shear gradient normal to the direction of flow

18.

Stream lines and path lines always coincide in case of

uniform flow

laminar flow

turbulent flow

steady flow

19.

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

Frictional loss head

Exit head drop

All of these

Sudden head drop of inlet

20.

Capillarity is due to

Cohesion and adhesion both

adhesion of liquid particle to a surface

Surface tension

Cohesion of liquid particles

Page 3 of 4

21.

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

22.

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

Vapour pressure

Viscosity

Surface tension

Bulk modulus of elasticity

23.

In general, surface tension

decreases with increase of temperature

remains unaffected by temperature up to critical temperature

increases with increase in temperature

remains unaffected by temperature

24.

A Newtonian fluid is defined as the fluid which

is incompressible and non viscous

is compressible and non-viscous

obey's Newton's law of viscosity

is highly viscous

25.

The viscosity of water is ___________than that of mercury.

higher

lower

infinity

zero

26.

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 fluid at rest

In a laminar flow

27.

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

W.h

h/W

W

W/h

28.

A barometer is used to measure

Pressure difference between two points

Atmospheric pressure

Very low pressure

Very high pressure

29.

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

30.

When subjected to shear force, a fluid

Undergoes static deformation

Deforms continuously no matter how smaller the shear stress may be

Deforms continuously only for large shear forces

Deforms continuously only for small shear stresses

Page 4 of 4

31.

Kinematic viscosity (v) is equal to

ρ/μ

μ x ρ

none of these

μ /ρ

32.

Atmosphere pressure head in terms of water column is

8.5 m

7.5 m

10.30 m

9.81 m

33.

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

γσ / 2r

σ / 2rγ

2σ / r

2σ / rγ

34.

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

35.

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

rise with concave surface upward

depress with concave surface upward

rise with convex surface upward

depress with convex surface upward

36.

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

low compressibility

very low vapour pressure

high density

negligible capillary effect

37.

The unit of kinematic viscosity is

gm/ cm-sec²

gm/cm²-sec

dyne-sec/cm²

cm²/sec

38.

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

981

9.81

98.1

0.981

39.

An ideal fluid is defined as the fluid which

is incompressible

has negligible surface tension

is incompressible and non-viscous (inviscid)

is compressible

40.

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

Fluid Mechanics MCQs Set-2

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