Fluid Mechanics
The pressure drop per unit length of pipe incurred by a fluid 'X' flowing through pipe is Δp. If another fluid 'Y' having both the specific gravity & density just double of that of fluid 'X', flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be

Δp/2
Δp
2Δp
Δp²

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Fluid Mechanics
Vane anemometer

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

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