Hydraulics and Fluid Mechanics in ME
An orifice is said to be large, if

The available head of liquid is less than 5 times the height of orifice
The velocity of flow is large
The size of orifice is large
The available head of liquid is more than 5 times the height of orifice

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Hydraulics and Fluid Mechanics in ME
Buoyant force is

The force necessary to maintain equilibrium of a submerged body
The resultant force on a body due to the fluid surrounding it
Equal to the volume of liquid displaced
The resultant force acting on a floating body

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