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

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

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Fluid Mechanics
Steady flow occurs, when the

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

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