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

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

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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

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

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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 change steadily with time
Conditions do not change with time at any point

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