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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
Free surface of a liquid tends to contract to the smallest possible area due to force of

surface tension
cohesion
friction
viscosity

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Hydraulics & Fluid Mechanics
The Prartdtl mixing length is

independent of shear stress
maximum at the pipe wall
None of these
zero at the pipe wall

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Hydraulics & Fluid Mechanics
The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is

always above the centroid of the area
None of these
always below the centroid of the area
at the centroid of the submerged area

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Hydraulics & Fluid Mechanics
The surface tension of mercury at normal temperature compared to that of water is

more or less depending on size of glass tube
less
more
same

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Hydraulics & Fluid Mechanics
A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of

4.2 M
4.0 M
4.8 M
4.6 M

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Hydraulics & Fluid Mechanics
In a Sutro weir, the discharge is proportional to (where H is head)

H3/2
H
H1/2
H5/2

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