SSC Selection Post 2022 PYQ — Question 49

 The correct answer is Option 1 i.e. Hydrometer.

The device used to measure characteristics of a liquid, such as its density or specific gravity, is called a hydrometer. A hydrometer is typically a sealed glass tube with a weighted bulb at one end, allowing it to float upright in a liquid. The level at which it floats depends on the density of the liquid. The scale on the stem indicates the specific gravity or density directly. Hydrometers are commonly used in laboratories, brewing, winemaking, and battery maintenance to assess the quality and concentration of fluids. Accurate readings depend on temperature, so many hydrometers include temperature correction scales.