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
the height of barometer will be less
both (B) and (C)

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Hydraulics & Fluid Mechanics
The horizontal component of force on a curved surface is equal to the

force on the horizontal projection of the curved surface
product of pressure intensity at its centroid and area
weight of liquid vertically above the curved surface
force on a vertical projection of the curved surface

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