Fluid Mechanics
In deriving Bernoulli's equation, fluid is assumed to be

None of these
Uniform, steady, incompressible, along a streamline
Steady, density being pressure dependent, frictionless
Incompressible, frictionless, steady, along a streamline

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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
Always the path of particle
Drawn normal to the velocity vector at every point

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