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Q: Which of the following instrument is used to check the purity of milk by measuring the relative density of milk?
  • A. Lactometer
  • B. Odometer
  • C. Barometer
  • D. Spherometer
Correct Answer: Option A - Lactometer is a instrument that is used to test the purity of the milk. It works on the principle of specific gravity of milk (Archimede’s Principle). It measures the relative density of milk with respect to water. If the specific gravity of a sample of milk is within the approved ranges, the milk is pure. If it is not, then there is some adulteration. Mr. Dicas of Liverpool invented lactometer.
A. Lactometer is a instrument that is used to test the purity of the milk. It works on the principle of specific gravity of milk (Archimede’s Principle). It measures the relative density of milk with respect to water. If the specific gravity of a sample of milk is within the approved ranges, the milk is pure. If it is not, then there is some adulteration. Mr. Dicas of Liverpool invented lactometer.

Explanations:

Lactometer is a instrument that is used to test the purity of the milk. It works on the principle of specific gravity of milk (Archimede’s Principle). It measures the relative density of milk with respect to water. If the specific gravity of a sample of milk is within the approved ranges, the milk is pure. If it is not, then there is some adulteration. Mr. Dicas of Liverpool invented lactometer.