Lactometers, which are used to determine the purity of sample of milk, works on which principle?

Correct option is A

The correct answer is (a) Archimedes principle.
· A lactometer works on Archimedes' principle, which states that a body immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced.
· In the case of a lactometer, it measures the density of milk by floating in it. If the milk is pure, the lactometer will sink to a certain level, while if the milk is adulterated (e.g., with water), it will float higher, indicating a lower density.
Information Booster:
· Pure milk has a specific density, and any adulteration will alter this density.
· Lactometers are commonly used in dairy industries to ensure milk quality.