Officer Aptitude Rating (OAR) Test 2025 – 400 Free Practice Questions to Pass the Exam

Image Description

Question: 1 / 400

What is the primary function of a hydrometer?

To measure temperature

To measure pressure

To measure specific gravity of liquids

A hydrometer is an instrument specifically designed to measure the specific gravity of liquids, which is the ratio of the density of the liquid to the density of water. This measurement is essential in various fields, such as chemistry, brewing, and winemaking, as it helps determine the concentration of substances in a liquid.

For instance, in winemaking, monitoring specific gravity can indicate fermentation progress, helping vintners know when to perform certain actions in the winemaking process. The hydrometer floats at a level that corresponds to the liquid's density; a higher density liquid will support the hydrometer to a higher level.

Given this function, other options do not align with the purpose of a hydrometer. It does not measure temperature, pressure, or altitude, as these require entirely different tools and methods for accurate measurement.

Get further explanation with Examzify DeepDiveBeta

To measure altitude

Next Question

Report this question

Download Officer Aptitude Rating (OAR) Practice Test PDF Study Guide
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy