Hydraulics and Fluid Mechanics in ME
Buoyant force is

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

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Hydraulics and Fluid Mechanics in ME
The overall efficiency of a reaction turbine is the ratio of

Work-done on the wheel to the energy (or head of water) actually supplied to the turbine
Actual work available at the turbine to the energy imparted to the wheel
Power produced by the turbine to the energy actually supplied by the turbine
None of these

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