Fluid Mechanics
The terminal velocity of a small sphere settling in a viscous fluid varies as the

Inverse of the fluid viscosity
First power of its dimeter
Inverse square of the diameter
Square of the difference in specific weights of solid & fluid

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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

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

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