Fluid Mechanics
The pressure drop per unit length of pipe incurred by a fluid 'X' flowing through pipe is Δp. If another fluid 'Y' having both the specific gravity & density just double of that of fluid 'X', flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be

2Δp
Δp/2
Δp
Δp²

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Fluid Mechanics
Turbine impeller

Produces only tangential current
Is effective over wide range of viscosities
Produces only radial current
Does not produce tangential current

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