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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
Specific weight of sea water is more that of pure water because it contains

dissolved air
All of these
dissolved salt
suspended matter

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Hydraulics & Fluid Mechanics
For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be

675
600
300
337.5

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Hydraulics & Fluid Mechanics
Mercury is often used in barometer because

its vapour pressure is so low that it may be neglected
the height of barometer will be less
it is the best liquid
both (B) and (C)

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Hydraulics & Fluid Mechanics
Surface energy per unit area of a surface is numerically equal to

force of cohesion
atmospheric pressure
surface tension
force of adhesion

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Hydraulics & Fluid Mechanics
For a floating body to be in stable equilibrium, its metacentre should be

below the center of buoyancy
between e.g. and center of pressure
above the center of gravity.
above the center of buoyancy

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Hydraulics & Fluid Mechanics
When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies

linearly with radial distance
inversely as the radial distance
as the square of the radial distance
inversely as the square of the radial distance

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