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 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

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Hydraulics and Fluid Mechanics in ME
A floating body is said to be in a state of stable equilibrium

only when its centre of gravity is below its centre of buoyancy
when the metacentre is above the centre of gravity
when the metacentre is below the centre of gravity
when its metacentric height is zero

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