Hydraulics & Fluid Mechanics Mercury is often used in barometer because

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

1 :25
1 : 2.5
1 : 5
1:50

Hydraulics & Fluid Mechanics The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if

All of these
the area is inclined
the area is horizontal
the area is vertical

Hydraulics & Fluid Mechanics Metacentric height is given as the distance between

the center of gravity of the body andthe meta center
the center of gravity of the body and the center of pressure
the center of gravity of the body and the center of buoyancy
center of buoyancy and metacentre

rotameter
pitot tube
orifice plate
venturi

Hydraulics & Fluid Mechanics According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to

weight of the fluid displaced by the body
more than the weight of the body
less than the weight of the body
the weight of the body