Home › MCQs › Food Science and Technology › Question #5886
Back to Questions
Food Science and Technology QUESTION #5886
Question 1
The principle behind the Lactometer (Quevenne lactometer) is:
  • Measurement of electrical conductivity of milk
  • Measurement of specific gravity/density of milk relative to water (genuine whole milk: SG \(1.028\text{–}1.034\))✔️
  • Colorimetric detection of fat content
  • Titration of milk with sodium hydroxide
Correct Answer Explanation
The lactometer measures specific gravity (density) of milk at \(15.5^{\circ}\text{C}\) (\(60^{\circ}\text{F}\)). Genuine whole milk has SG \(1.028\text{–}1.034\). Adulteration with water lowers the reading; addition of starch or salt raises it.