Multiple choice

Hydrometer is an instrument

  1. For measuring sound under water

  2. To detect the presence of hydrogen in the atmosphere

  3. For measuring the specific gravity of liquids

  4. To detect the changes in atmosphere humidity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A hydrometer is an instrument used to measure the specific gravity (relative density) of liquids. It floats at different levels depending on the liquid's density and is commonly used to check battery electrolyte, alcohol content, or urine specific gravity.

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