Hydraulics & Fluid Mechanics
Mercury is often used in barometer because

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

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Hydraulics & Fluid Mechanics
Non uniform flow occurs when

the direction and magnitude of the velocity at all points are identical
the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
velocity, depth, pressure, etc. change from point to point in the fluid flow

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