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

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

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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

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

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