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.

Atmosphere pressure head in terms of water column is

8.5 m

9.81 m

7.5 m

10.30 m

3.

Stoke is the unit of

None of these

Viscosity

Kinematic viscosity

Surface Tension

4.

A barometer is used to measure

Atmospheric pressure

Pressure difference between two points

Very high pressure

Very low pressure

5.

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

Capillarity

Surface Tension

Viscosity

Cohesion

6.

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

7.

Pressure at a point inside a liquid does not depend on

The depth of the point below the surface of the liquid

The shape of the containing vessel

The nature of the liquid

The acceleration due to gravity at that point

8.

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

9.

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

2

1

4/3

0

10.

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

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11.

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

high density

negligible capillary effect

very low vapour pressure

low compressibility

12.

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

proportional to angular deformation

inversely proportional to rate of angular deformation

13.

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

W

W.h

W/h

h/W

14.

The viscosity of water is ___________than that of mercury.

higher

infinity

zero

lower

15.

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

compressible

uniform

incompressible

non-linear

16.

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

17.

An ideal fluid is defined as the fluid which

is incompressible

is incompressible and non-viscous (inviscid)

has negligible surface tension

is compressible

18.

Stream lines and path lines always coincide in case of

turbulent flow

steady flow

laminar flow

uniform flow

19.

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

In a fluid at rest

In a laminar flow

In a liquid at rest

In a turbulent flow

20.

Pascal-second is the unit of

surface tension

kinematic viscosity

pressure

dynamic viscosity

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21.

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

Pascal's law

Newton's law

Dalton's law

Boyle's law

22.

When subjected to shear force, a fluid

Deforms continuously only for small shear stresses

Deforms continuously only for large shear forces

Undergoes static deformation

Deforms continuously no matter how smaller the shear stress may be

23.

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

30 mm

50 mm

15 mm

20 mm

24.

Newton's law of viscosity depends upon the

Shear stress, pressure and velocity

Shear stress and rate of strain

Viscosity and shear stress

Stress and strain in the fluid

25.

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

Velocity gradient parallel to the direction of flow

Shear gradient parallel to direction of flow

Velocity gradient normal to the direction of flow

Shear gradient normal to the direction of flow

26.

Capillarity is due to

Cohesion of liquid particles

Cohesion and adhesion both

adhesion of liquid particle to a surface

Surface tension

27.

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

Adhesion

Surface Tension

Cohesion

Viscosity

28.

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

29.

The increase of temperature

decreases the viscosity of a liquid

increases the viscosity of a liquid

increases the viscosity of a gas

decreases the viscosity of a gas

30.

The unit of kinematic viscosity is

cm²/sec

gm/ cm-sec²

dyne-sec/cm²

gm/cm²-sec

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31.

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

2σ / rγ

γσ / 2r

σ / 2rγ

2σ / r

32.

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

33.

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

0.981

981

9.81

98.1

34.

Kinematic viscosity (v) is equal to

none of these

ρ/μ

μ /ρ

μ x ρ

35.

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

Vapour pressure

Viscosity

Surface tension

Bulk modulus of elasticity

36.

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

when the metacentre is below the centre of gravity

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

when the metacentre is above the centre of gravity

when its metacentric height is zero

37.

An ideal fluid is

frictionless and compressible

one which obeys Newton's law of viscosity

very viscous

frictionless and incompressible

38.

Surface Tension has the units of

Force per unit length

Force per unit area

None of these

Force per unit volume

39.

Pressure measured with the help of piezometer tube is

Absolute pressure

Vacuum pressure

Gauge pressure

Atmospheric pressure

40.

In general, surface tension

remains unaffected by temperature

decreases with increase of temperature

increases with increase in temperature

remains unaffected by temperature up to critical temperature

Fluid Mechanics MCQs Set-2

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