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

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
Gravitational force is more than the up-thrust of the liquid

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

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

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