The normal stress is same in all directions at a point in a fluid

only when fluid is frictionless

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Only when fluid is incompressible and has zero viscosity

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when there is no motion of one fluid layer relative to an adjacent layer

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Irrespective of motion of one fluid layer relative to an adjacent layer

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Solution

The correct option is D when there is no motion of one fluid layer relative to an adjacent layer
The normal stress is same in all directions at a point in a fluid when there is no motion of one fluid layer relative to an adjacent layer

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Fluid friction is ___ offered by a fluid against the relative motion of its layers.

\begin{matrix} Column 1 & Column 2 A & Compressible fluid & i & Internal friction between adjacent layers is absent B & Incompressible fluid & i i & Has variable density C & Viscous fluid & i i i & Internal friction between adjacent layers is present D & Non-viscous fluid & i v & Has constant density \end{matrix}

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