Fluid Mechanics
Path followed by water jet issuing from the bottom of a water tank will be a

Horizontal straight line
Parabola (vertex being at the opening)
Hyperbola
Zig-zag path (which is geometrically undefined)

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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

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

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