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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
The units of viscosity are

metre2/se
newton-sec/metre
newton-sec/metre2
kg sec/metre

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Hydraulics & Fluid Mechanics
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

force of friction
force of adhesion
force of diffusion
force of cohesion

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Hydraulics & Fluid Mechanics
The resultant of all normal pressures acts

vertically upwards
at e.g. of body
at metacentre
at center of pressure

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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

337.5
675
600
300

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Hydraulics & Fluid Mechanics
In which of the following the friction drag is generally larger than pressure drag?

an airfoil
a sphere
a circular disc or plate held normal to flow
a cylinder

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

atmospheric pressure
force of adhesion
surface tension
force of cohesion

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