Fluid Mechanics
Steady flow occurs, when the

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

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

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
Remains constant over the cross-section

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