Fluid Mechanics
A venturimeter can not be used for the direct measurement of

Pressure difference in the flow throughpipeline
Datum difference in the stretch of pipeflow
Friction loss in pipe flow
All of these

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Fluid Mechanics
A stream line is

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

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