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

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

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Fluid Mechanics
A stream line is

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

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