Hydraulics & Fluid Mechanics
Mercury is often used in barometer because

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

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Hydraulics & Fluid Mechanics
According to Bernoulli’s equation for steady ideal fluid flow

principle of conservation of mass holds
the energy is constant along a stream-line but may vary across streamlines
velocity and pressure are inversely proportional
total energy is constant throughout

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