Fluid Mechanics MCQs Set-2

Page 1 of 4

1.

When subjected to shear force, a fluid

Deforms continuously only for small shear stresses

Undergoes static deformation

Deforms continuously only for large shear forces

Deforms continuously no matter how smaller the shear stress may be

2.

The increase of temperature

increases the viscosity of a gas

decreases the viscosity of a liquid

increases the viscosity of a liquid

decreases the viscosity of a gas

3.

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

Dalton's law

Boyle's law

Pascal's law

Newton's law

4.

Stream lines and path lines always coincide in case of

steady flow

uniform flow

laminar flow

turbulent flow

5.

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

very low vapour pressure

low compressibility

negligible capillary effect

high density

6.

The viscosity of water is ___________than that of mercury.

infinity

higher

zero

lower

7.

Pressure measured with the help of piezometer tube is

Vacuum pressure

Absolute pressure

Gauge pressure

Atmospheric pressure

8.

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

when the metacentre is below the centre of gravity

when the metacentre is above the centre of gravity

when its metacentric height is zero

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

9.

An ideal fluid is

one which obeys Newton's law of viscosity

frictionless and incompressible

frictionless and compressible

very viscous

10.

A barometer is used to measure

Atmospheric pressure

Very high pressure

Pressure difference between two points

Very low pressure

Page 2 of 4

11.

In general, surface tension

remains unaffected by temperature up to critical temperature

increases with increase in temperature

remains unaffected by temperature

decreases with increase of temperature

12.

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

All of these

Sudden head drop of inlet

Frictional loss head

Exit head drop

13.

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

inversely proportional to rate of angular deformation

proportional to rate of angular deformation

proportional to angular deformation

inversely proportional to angular deformation

14.

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

50 mm

30 mm

15 mm

20 mm

15.

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

uniform

compressible

non-linear

incompressible

16.

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

In a laminar flow

In a liquid at rest

In a turbulent flow

In a fluid at rest

17.

Kinematic viscosity (v) is equal to

μ /ρ

ρ/μ

μ x ρ

none of these

18.

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

19.

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

2σ / rγ

γσ / 2r

2σ / r

σ / 2rγ

20.

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

Surface Tension

Cohesion

Capillarity

Viscosity

Page 3 of 4

21.

An ideal fluid is defined as the fluid which

has negligible surface tension

is compressible

is incompressible and non-viscous (inviscid)

is incompressible

22.

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

Bulk modulus of elasticity

Vapour pressure

Viscosity

Surface tension

23.

Hydrostatic pressure on a dam depends upon its

Depth

Length

Shape

All of these

24.

The viscosity of a gas

decreases with increase in temperature

increases with increase in temperature

is independent of temperature

is independent of pressure for very high pressure intensities

25.

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

0.981

98.1

981

9.81

26.

Surface Tension has the units of

Force per unit area

Force per unit length

None of these

Force per unit volume

27.

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

28.

Centre of buoyancy always

remains below the centre of gravity

coincides with the centroid of the volume of fluid displaced

coincides with the centre of gravity

remains above the centre of gravity

29.

Pressure at a point inside a liquid does not depend on

The depth of the point below the surface of the liquid

The acceleration due to gravity at that point

The shape of the containing vessel

The nature of the liquid

30.

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

Surface Tension

Adhesion

Cohesion

Viscosity

Page 4 of 4

31.

A Newtonian fluid is defined as the fluid which

is incompressible and non viscous

is compressible and non-viscous

is highly viscous

obey's Newton's law of viscosity

32.

Pascal-second is the unit of

dynamic viscosity

kinematic viscosity

pressure

surface tension

33.

Capillarity is due to

Cohesion of liquid particles

Cohesion and adhesion both

adhesion of liquid particle to a surface

Surface tension

34.

Stoke is the unit of

Kinematic viscosity

Viscosity

None of these

Surface Tension

35.

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

W

W.h

W/h

h/W

36.

The unit of kinematic viscosity is

gm/cm²-sec

gm/ cm-sec²

cm²/sec

dyne-sec/cm²

37.

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

Velocity gradient parallel to the direction of flow

Velocity gradient normal to the direction of flow

Shear gradient parallel to direction of flow

Shear gradient normal to the direction of flow

38.

Atmosphere pressure head in terms of water column is

10.30 m

9.81 m

7.5 m

8.5 m

39.

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

1

4/3

2

0

40.

Newton's law of viscosity depends upon the

Shear stress and rate of strain

Shear stress, pressure and velocity

Viscosity and shear stress

Stress and strain in the fluid

Fluid Mechanics MCQs Set-2

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