Hydraulics and Fluid Mechanics in ME
The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice)

Q = Cd × bH × √(2gh)
Q = Cd × b (H2 - H1) × √(2gh)
Q = Cd × bH₁ × √(2gh)
Q = Cd × bH2 × √(2gh)

ANSWER DOWNLOAD EXAMIANS APP

Hydraulics and Fluid Mechanics in ME
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

ratio of inertial force to force due to gravitation
ratio of inertial force to force due to surface tension
all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity
ratio of inertial force to force due to viscosity

ANSWER DOWNLOAD EXAMIANS APP

Hydraulics and Fluid Mechanics in ME
A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury?

Metal piece will sink to the bottom
The metal piece will simply float over the mercury
Whole of the metal piece will be immersed with its top surface just at mercury level
The metal piece will be immersed in mercury by half

ANSWER DOWNLOAD EXAMIANS APP