SSC Selection Post 2022 PYQ — Question 42

The correct answer is option 4 i.e. Hygrometer.

A hygrometer is an instrument specifically designed to measure relative humidity. It works by various principles, but commonly, it detects changes in properties like electrical resistance or expansion and contraction in materials that absorb moisture from the air. By quantifying the amount of water vapor present in the atmosphere relative to the maximum it can hold at a given temperature, hygrometers provide crucial data for meteorology, industrial processes, and even residential comfort.