Fluid Mechanics
Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an

Pitot tube
Rotameter
Orificemeter
Venturimeter

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Fluid Mechanics
The Prandtl mixing length is

Zero at the pipe wall and is a universal constant
Useful for computing laminar flow problems
Independent of radial distance from the pipe axis
Independent of the shear stress

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Fluid Mechanics
The continuity equation

Relates mass flow rate along a stream tube
Stipulates that Newton's second law of motion must be satisfied at every point in the fluid
None of these
Relates work and energy

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