[amp_mcq option1=”Pyroheliometer : Radiation” option2=”Calorimeter : Heat” option3=”Planimeter : Area” option4=”Barometer : Humidity” correct=”option4″]
The correct answer is D. Barometer : Humidity.
A pyroheliometer is an instrument used to measure solar radiation. A calorimeter is an instrument used to measure heat. A planimeter is an instrument used to measure area. A barometer is an instrument used to measure air pressure.
Humidity is the amount of water vapor in the air. It is not measured by a barometer.
The other three pairs are all related in that the first word is an instrument that measures the second word.