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

The available head of liquid is more 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 less than 5 times the height of orifice

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Hydraulics and Fluid Mechanics in ME
When a body is placed over a liquid, it will sink down if

Gravitational force is more than the up-thrust of the liquid
None of these
Gravitational force is equal to the up-thrust of the liquid
Gravitational force is less than the up-thrust of the liquid

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