## Hydraulics & Fluid Mechanics According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to

the weight of the body
more than the weight of the body
weight of the fluid displaced by the body
less than the weight of the body

1 : 2.5
1:50
1 :25
1 : 5

675
600
300
337.5

## 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 directly proportional to pipe wall roughness
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

orifice plate
pitot tube
rotameter
venturi

## 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 square of the radial distance
inversely as the radial distance
as the square of the radial distance