## Hydraulics & Fluid Mechanics Mercury is often used in barometer because

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

## Hydraulics & Fluid Mechanics A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

decrease
increase
increase/decrease depending on depth of immersion
remain same

(d)p = 2T/r
(b)p = T/r
p = T/2r
(a)p = Txr

9.75 m/sec²
9.81 m/sec²
10m/sec²
10.2/m sec

## Hydraulics & Fluid Mechanics The normal stress is same in all directions at a point in a fluid

irrespective of the motion of one fluid layer relative to an adjacent layer
only when the fluid is frictionless
only when the fluid is incompressible and has zero viscosity
When there is no motion of one fluid layer relative to an adjacent layer

## 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

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