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

Orificemeter
Rotameter
Pitot tube
Venturimeter

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Fluid Mechanics
Shear stress in a fluid flowing in a round pipe

Varies parabolically across the cross-section
Is zero at the wall and increases linearly to the centre
Remains constant over the cross-section
Is zero at the centre and varies linearly with the radius

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