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

None of these
Gravitational force is equal to the up-thrust of the liquid
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
In a reaction turbine, the draft tube is used

To transport water to downstream
To prevent air to enter the turbine
To run the turbine full
To increase the head of water by an amount equal to the height of the runner outlet above the tail race

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