Hydraulics & Fluid Mechanics
A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

decrease
remain same
increase
increase/decrease depending on depth of immersion

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

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

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Hydraulics & Fluid Mechanics
Choose the wrong statement

when in equilibrium, fluids cannot sustain tangential forces
when in equilibrium, fluids can sustain shear forces
fluids are capable of flowing
fluids conform to the shape of the con-taining vessels

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