1671. The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is_______________?

A. constant over the cross section
B. parabolic distribution across the section
C. zero at the mid plane and varies linearly with distance from mid plane
D. zero at plates and increases linearly to midpoint
✅ The correct answer is option C.

1675. A floating body is said to be in a state of stable equilibrium_________________?

A. when its metacentric height is zero
B. when the metacentre is above the centre of gravity
C. when the metacentre is below the centre of gravity
D. only when its centre of gravity is below its centre of buoyancy
✅ The correct answer is option B.

1680. For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is________________?

A. directly proportional to Reynolds number and independent of pipe wall roughness
B. directly proportional to pipe wall roughness and independent of Reynolds number
C. inversely proportional to Reynolds number and indpendent of pipe wall roughness
D. inversely proportional to Reynolds number and directly proportional to pipe wall roughness
✅ The correct answer is option C.