Fluid Mechanics
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

Absolute roughness
Friction co-efficient for flows at equal Reynold number
All of these
Relative roughness

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

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

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