Multiple choice

Which of the following gadgets would be used to know the purity of milk?

  1. Hygrometer

  2. Lactometer

  3. Anemometer

  4. Tachometer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A lactometer is a specialized hydrometer designed to measure the density and purity of milk. It works on the principle of buoyancy - the higher the density of milk, the higher the lactometer floats. Adulterated milk with added water has lower density and causes the lactometer to sink lower. Hygrometers measure humidity, anemometers measure wind speed, and tachometers measure rotational speed.

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