Hydraulics and Fluid Mechanics in ME
The Newton's law of resistance is based on the assumption that the

Planes of the body are completely smooth
All of these
Space around the body is completely filled with the fluid
Fluid particles do not exert any influence on one another

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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
None of these
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

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