Fluid Mechanics
Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton's law of viscosity. (II) Newton's second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to boundary. (V) Fluid cannot penetrate a boundary.

I, II, III
I, II, V
II, IV, V
II, III, V

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Fluid Mechanics
Turbine impeller

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

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