A) Temperature- Thermometer
B) Atmospheric pressure- Barometer
C) Relative density- Hygrometer
D) Unit of charge- Coulomh
Correct Answer: C
Solution :
Thermometer is used to measure temperature, barometer is used to measure atmospheric pressure, unit of charge is measured in term of colulomb. While hydrometer (also called aerometer) is an instrument used to measure relative density and hygrometer is used to measure humidity of air.
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