Discussion
The instrument used to measure wind speed is called :
Answer: B
Wind speed is measured with an anemometer.
The common cup anemometer has three or four cups on arms that spin about a vertical axis; the rate of rotation is proportional to wind speed. Vane, hot-wire and sonic anemometers measure the same quantity by other means.
The other instruments measure different things. A hydrometer measures the density or specific gravity of a liquid. A pH meter measures the acidity or alkalinity of a solution. A piezometer measures pore-water pressure or the water level in an aquifer, which gives the hydraulic head.
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