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 fluid at rest

In a liquid at rest

In a laminar flow

In a turbulent flow

2.

An ideal fluid is

frictionless and incompressible

one which obeys Newton's law of viscosity

frictionless and compressible

very viscous

3.

The viscosity of a gas

decreases with increase in temperature

is independent of pressure for very high pressure intensities

increases with increase in temperature

is independent of temperature

4.

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

50 mm

30 mm

20 mm

15 mm

5.

Pressure at a point inside a liquid does not depend on

The nature of the liquid

The depth of the point below the surface of the liquid

The shape of the containing vessel

The acceleration due to gravity at that point

6.

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

9.81

981

98.1

0.981

7.

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

compressible

uniform

incompressible

non-linear

8.

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

Newton's law

Boyle's law

Dalton's law

Pascal's law

9.

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 above the centre of gravity

when the metacentre is below the centre of gravity

10.

Newton's law of viscosity depends upon the

Viscosity and shear stress

Shear stress, pressure and velocity

Shear stress and rate of strain

Stress and strain in the fluid

Page 2 of 4

11.

A barometer is used to measure

Pressure difference between two points

Very low pressure

Very high pressure

Atmospheric pressure

12.

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

2σ / r

σ / 2rγ

γσ / 2r

2σ / rγ

13.

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

h/W

W/h

W.h

W

14.

Stoke is the unit of

None of these

Kinematic viscosity

Viscosity

Surface Tension

15.

In general, surface tension

remains unaffected by temperature up to critical temperature

decreases with increase of temperature

increases with increase in temperature

remains unaffected by temperature

16.

When subjected to shear force, a fluid

Deforms continuously no matter how smaller the shear stress may be

Deforms continuously only for large shear forces

Undergoes static deformation

Deforms continuously only for small shear stresses

17.

Pressure measured with the help of piezometer tube is

Gauge pressure

Vacuum pressure

Atmospheric pressure

Absolute pressure

18.

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

Surface Tension

Cohesion

Viscosity

Adhesion

19.

Capillarity is due to

Surface tension

Cohesion and adhesion both

adhesion of liquid particle to a surface

Cohesion of liquid particles

20.

Surface Tension has the units of

Force per unit volume

Force per unit length

None of these

Force per unit area

Page 3 of 4

21.

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

proportional to angular deformation

proportional to rate of angular deformation

inversely proportional to angular deformation

inversely proportional to rate of angular deformation

22.

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

Shear gradient normal to the direction of flow

Velocity gradient parallel to the direction of flow

23.

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

Surface Tension

Viscosity

Capillarity

Cohesion

24.

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

low compressibility

high density

negligible capillary effect

very low vapour pressure

25.

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

Viscosity

Surface tension

Bulk modulus of elasticity

Vapour pressure

26.

A Newtonian fluid is defined as the fluid which

is incompressible and non viscous

is highly viscous

is compressible and non-viscous

obey's Newton's law of viscosity

27.

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

Sudden head drop of inlet

Frictional loss head

All of these

Exit head drop

28.

Hydrostatic pressure on a dam depends upon its

Length

All of these

Shape

Depth

29.

The motion of air mass in a tornado is a

forced vortex motion

free vortex at centre and forced vortex outside

free vortex motion

forced vortex at centre and free vortex outside

30.

Pascal-second is the unit of

kinematic viscosity

dynamic viscosity

pressure

surface tension

Page 4 of 4

31.

Centre of buoyancy always

coincides with the centroid of the volume of fluid displaced

coincides with the centre of gravity

remains below the centre of gravity

remains above the centre of gravity

32.

Kinematic viscosity (v) is equal to

μ x ρ

μ /ρ

none of these

ρ/μ

33.

The unit of kinematic viscosity is

cm²/sec

gm/ cm-sec²

gm/cm²-sec

dyne-sec/cm²

34.

The viscosity of water is ___________than that of mercury.

infinity

higher

lower

zero

35.

The increase of temperature

increases the viscosity of a gas

increases the viscosity of a liquid

decreases the viscosity of a gas

decreases the viscosity of a liquid

36.

Stream lines and path lines always coincide in case of

uniform flow

steady flow

turbulent flow

laminar flow

37.

Atmosphere pressure head in terms of water column is

8.5 m

10.30 m

9.81 m

7.5 m

38.

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

rise with concave surface upward

rise with convex surface upward

depress with concave surface upward

depress with convex surface upward

39.

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

2

0

4/3

1

40.

An ideal fluid is defined as the fluid which

is incompressible and non-viscous (inviscid)

is incompressible

is compressible

has negligible surface tension

Fluid Mechanics MCQs Set-2

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