Hydraulics & Fluid Mechanics
Mercury is often used in barometer because

it is the best liquid
its vapour pressure is so low that it may be neglected
both (B) and (C)
the height of barometer will be less

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

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