Fluid Mechanics

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Fluid Mechanics

Topic :- Fluid Properties, Hydrostatic Forces, Buoyancy and Floatation

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The pressure intensity in kg/cm² at any point in a liquid is (where w is unit weight of liquid in kg/cm³, h is the depth of the point from liquid surface) [SSC : JE : 2011]

1 point

h/w

w/h

Clear selection

The characteristic of an ideal fluid is ? [SSC : JE : 2012, DMRC : JE : 2017]

1 point

one which satisfies continuity equation

one which flows with least friction

one which obeys Newton's law of Viscosity

frictionless and incompressible

Clear selection

A rectangular plate 1.25 m x 2.4 m is immersed in a liquid of relative density 0.85 with its 1.25 m side horizontal and just at the water surface. If the plane of the plate makes an angle of 60° with the horizontal, the pressure force on one side of the plate of [SSC : JE : 2012]

1 point

30.0 kN

26.0 kN

30.6 kN

15.0 kN

Clear selection

The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called [SSC : JE : 2012]

1 point

Surface tension of liquid

Specific gravity of liquid

Compressibility of liquid

Density of liquid

Clear selection

Bulk modulus of fluid is the ratio of [SSC : JE : 2014]

1 point

shear stress to shear strain

critical velocity to the velocity of fluid

increase in pressure to the volumetric strain

increase in volume to the viscosity of fluid

Clear selection

The buoyancy depends upon the [SSC : JE : 2013]

1 point

weight of the liquid displaced

pressure with which the liquid is displaced

compressibility of the liquid

viscosity of the liquid

Clear selection

Manometer is a device used for measuring [SSC : JE : 2014, WRD : 2015]

1 point

Pressure

Velocity

Discharge

Density

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Capillarity is due to (I) surface tension (II) cohesion (III) viscosity (IV) weight density of liquid [SSC : JE : 2014]

1 point

II, III, V

III

II, III

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Pressure in terms of metres of oil (specific gravity 0.9) equivalent to 4.5 m of water is [SSC : JE : 2014]

1 point

5.0

3.6

0.298

4.05

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Capillary rise is a phenomenon that is attributed to the following property of fluid [SSC : JE : 2014]

1 point

surface tension

density

viscosity

vapour pressure

Clear selection

Specific gravity has a unit [SSC : JE : 2014, DMRC : JE : 2017]

1 point

g/cc

N/m³

No unit i.e.. dimensionless

kg/m³

Clear selection

The total energy line lies above the hydraulic gradient line by an amount equal to [SSC : JE : 2014]

1 point

sum of pressure, velocity and datum heads

Pressure head, P/γ

Velocity head, v²/2g

datum head, z

Clear selection

A fluid, which is incompressible and is having no viscosity is [SSC : JE : 2014]

1 point

Newtonian fluid

Non Newtonian fluid

Real fluid

Ideal fluid

Clear selection

For stability of floating bodies, the metacentre should be: [SSC : JE : 2015]

1 point

below the centre of buoyancy

below the centre of gravity

above the centre of gravity

above the centre of buoyancy

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The volumetric change of the fluid cause by resistance is ______ [DMRC : JE : 2017]

1 point

compressibility

volumetric index

adhesion

volumetric strain

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The property by which the molecules of fluid are attracted by their own is called as _______ ? [DMRC : JE : 2017]

1 point

Surface Tension

cohesion

adhesion

viscosity

Clear selection

Mercury is used in Manometer because [WRD : 2016]

1 point

It is liquid metal

It gives less height of column for high pressure

It is perfect Fluid

Its volume changes with temperature

Clear selection

A differential manometer is used to measure [WRD : 2016]

1 point

pressure difference between two points in a pipe

pressure at a point in a pipe

Atmospheric pressure

Velocity of liquid

Clear selection

The center of gravity of the volume of the liquid displaced by an immersed body is called_______ [PWD : 2018]

1 point

metacentre

center of pressure

center of gravity

center of buoyancy

Clear selection

The unit kg/m³ is used for [PWD : 2018]

1 point

pressure

force

density

volume

Clear selection

The specific volume of a liquid is the reciprocal of

1 point

weight density

specific weight

specific volume

mass density

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If a person studies about a fluid which is at rest, what will you call his domain of study?

1 point

Fluid Dynamics

Fluid Mechanics

Fluid Kinematics

Fluid Statics

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The value of the compressibility of an ideal fluid is

1 point

zero

infinity

more than that of a real fluid

unity

Clear selection

Which of the following contribute to the reason behind the origin of surface tension?

1 point

only cohesive forces

neither cohesive forces nor adhesive forces

only adhesive forces

both cohesive forces and adhesive forces

Clear selection

A manometric liquid should suitably have ______

1 point

Low density & High Vapour pressure

High density & Low Vapour pressure

High density & High Vapour pressure

Low density & Low Vapour pressure

Clear selection

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