Fluid Mechanics
Transition from laminar flow to turbulent flow is aided by the

All of these
Vibration
Pressure gradient and the compressibility of the flowing medium
Surface roughness and curvature (i.e.sharp corners)

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Fluid Mechanics
A stream line is

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

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