Previous Year Question
The velocity of wind is measured by
A.
Barometer
B.
Anaemometer
C.
Hydrometer
D.
Wind Vane
Correct Answer: B
Detailed Solution
An Anemometer is an instrument used to measure wind speed or the velocity of air.
A common Cup Anemometer consists of three or four cups attached to a vertical axis. When wind blows, the cups rotate. Their rotational speed varies with wind speed, and the instrument converts this rotation into a measurement of the velocity of air.
The other instruments have different functions—
A Barometer measures atmospheric pressure.
A Hydrometer measures the relative density or specific gravity of a liquid.
A Wind Vane indicates the direction from which the wind is blowing, not its speed.