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

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Fluid Mechanics
A stream line is

Drawn normal to the velocity vector at every point
Fixed in space in steady flow
A line connecting the mid points of flow cross-section
Always the path of particle

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