Which of the following pair of a scientific instrument and its measured parameter is not correctly matched ?
Pyranometer – Wind direction
Weather stations use a set of standard instruments, each designed to measure one atmospheric quantity. The question asks for the pair in which the instrument does not measure the stated parameter.
A pyranometer measures solar radiation (the total short-wave radiation from the sun and sky falling on a surface). Wind direction is shown by a wind vane (weather vane), so the pyranometer pair is wrongly matched.
The other pairs are correct: a hygrometer measures the relative humidity of air, a barometer measures atmospheric pressure, and an anemometer measures wind speed. Since one pair is wrong, the none-of-the-above choice does not fit.
Pyranometer – Wind direction option is correct.
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