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Hydraulics
0

Fluid Mechanics MCQs Set-2

August 9, 2020

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Page 1 of 4

1.

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Kinematic viscosity (v) is equal to

μ /ρ

none of these

ρ/μ

μ x ρ

2.

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An ideal fluid is

very viscous

one which obeys Newton's law of viscosity

frictionless and compressible

frictionless and incompressible

3.

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Centre of buoyancy always

coincides with the centroid of the volume of fluid displaced

remains above the centre of gravity

coincides with the centre of gravity

remains below the centre of gravity

4.

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The increase of temperature

decreases the viscosity of a liquid

decreases the viscosity of a gas

increases the viscosity of a gas

increases the viscosity of a liquid

5.

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The unit of kinematic viscosity is

cm²/sec

gm/cm²-sec

gm/ cm-sec²

dyne-sec/cm²

6.

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The viscosity of water is ___________than that of mercury.

zero

higher

infinity

lower

7.

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Pressure measured with the help of piezometer tube is

Atmospheric pressure

Absolute pressure

Vacuum pressure

Gauge pressure

8.

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Pressure at a point inside a liquid does not depend on

The acceleration due to gravity at that point

The depth of the point below the surface of the liquid

The nature of the liquid

The shape of the containing vessel

9.

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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

10.

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

inversely proportional to rate of angular deformation

inversely proportional to angular deformation

proportional to rate of angular deformation

proportional to angular deformation

Page 2 of 4

11.

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

2σ / rγ

σ / 2rγ

γσ / 2r

2σ / r

12.

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

Viscosity

Cohesion

Surface Tension

Adhesion

13.

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Hydrostatic pressure on a dam depends upon its

Depth

Shape

Length

All of these

14.

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

h/W

W

W.h

W/h

15.

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Newton's law of viscosity depends upon the

Viscosity and shear stress

Shear stress, pressure and velocity

Stress and strain in the fluid

Shear stress and rate of strain

16.

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When subjected to shear force, a fluid

Deforms continuously only for small shear stresses

Deforms continuously no matter how smaller the shear stress may be

Undergoes static deformation

Deforms continuously only for large shear forces

17.

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An ideal fluid is defined as the fluid which

has negligible surface tension

is incompressible and non-viscous (inviscid)

is incompressible

is compressible

18.

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Stoke is the unit of

Surface Tension

Viscosity

None of these

Kinematic viscosity

19.

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

Velocity gradient parallel to the direction of flow

Shear gradient normal to the direction of flow

Velocity gradient normal to the direction of flow

Shear gradient parallel to direction of flow

20.

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

In a laminar flow

In a fluid at rest

In a liquid at rest

In a turbulent flow

Page 3 of 4

21.

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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

22.

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

Cohesion

Viscosity

Surface Tension

Capillarity

23.

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Atmosphere pressure head in terms of water column is

10.30 m

9.81 m

7.5 m

8.5 m

24.

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

non-linear

uniform

compressible

incompressible

25.

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

low compressibility

high density

negligible capillary effect

very low vapour pressure

26.

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The motion of air mass in a tornado is a

free vortex motion

free vortex at centre and forced vortex outside

forced vortex at centre and free vortex outside

forced vortex motion

27.

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Pascal-second is the unit of

pressure

dynamic viscosity

surface tension

kinematic viscosity

28.

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Surface Tension has the units of

Force per unit length

Force per unit area

None of these

Force per unit volume

29.

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

Pascal's law

Boyle's law

Newton's law

Dalton's law

30.

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A Newtonian fluid is defined as the fluid which

is compressible and non-viscous

obey's Newton's law of viscosity

is highly viscous

is incompressible and non viscous

Page 4 of 4

31.

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

4/3

1

0

2

32.

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

depress with convex surface upward

depress with concave surface upward

rise with convex surface upward

rise with concave surface upward

33.

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

Surface tension

Viscosity

Vapour pressure

Bulk modulus of elasticity

34.

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Stream lines and path lines always coincide in case of

uniform flow

turbulent flow

laminar flow

steady flow

35.

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In general, surface tension

remains unaffected by temperature

remains unaffected by temperature up to critical temperature

increases with increase in temperature

decreases with increase of temperature

36.

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

98.1

981

9.81

0.981

37.

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A barometer is used to measure

Very low pressure

Pressure difference between two points

Atmospheric pressure

Very high pressure

38.

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

All of these

Exit head drop

Sudden head drop of inlet

Frictional loss head

39.

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Capillarity is due to

Cohesion of liquid particles

adhesion of liquid particle to a surface

Cohesion and adhesion both

Surface tension

40.

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

when its metacentric height is zero

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

when the metacentre is below the centre of gravity

when the metacentre is above the centre of gravity

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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