Fluid Mechanics
Steady flow occurs, when the

Conditions are the same at the adjacent points at any instant
Conditions do not change with time at any point
Rate of the velocity change is constant
Conditions change steadily with time

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Fluid Mechanics
Shear stress in a fluid flowing in a round pipe

Remains constant over the cross-section
Is zero at the centre and varies linearly with the radius
Varies parabolically across the cross-section
Is zero at the wall and increases linearly to the centre

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