The normal stress is the same in directions at a point in a fluid only

1.	The normal stress is the same in directions at a point in a fluid only when;
A.	The fluid is frictional
B.	The fluid is frictionless and incompressible
C.	The fluid has zero viscosity and is at rest
D.	One fluid layer has no motion relative to an adjacent layer.
Answer» C. The fluid has zero viscosity and is at rest

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The normal stress is the same in directions at a point in a fluid only when;

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