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

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

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Hydraulics & Fluid Mechanics
According to Bernoulli’s equation for steady ideal fluid flow

the energy is constant along a stream-line but may vary across streamlines
principle of conservation of mass holds
velocity and pressure are inversely proportional
total energy is constant throughout

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Hydraulics & Fluid Mechanics
For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is

inversely proportional to Reynolds number and indpendent of pipe wall roughness
directly proportional to pipe wall roughness and independent of Reynolds number
directly proportional to Reynolds number and independent of pipe wall roughness
inversely proportional to Reynolds number and directly proportional to pipe wall roughness

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