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

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

None of these
Power produced by the turbine to the energy actually supplied by the turbine
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

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