Fluid Mechanics
Vane anemometer

Rotates an element at a speed determined by the velocity of the fluid in which the meter is immersed
Is an area meter
Is a variable head meter
None of these

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Fluid Mechanics
The continuity equation

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

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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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