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

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

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Fluid Mechanics
A stream line is

A line connecting the mid points of flow cross-section
Fixed in space in steady flow
Drawn normal to the velocity vector at every point
Always the path of particle

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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
All of these
Absolute roughness
Relative roughness

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