Fluid Mechanics
The normal stress is the same in all directions at a point in a fluid, when the fluid is

Non-viscous
Incompressible
Both A and B
Having no motion of one fluid layer relative to the other

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Fluid Mechanics
A stream line is

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

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