Question

Instrument used to test specific gravity of milk and adulteration of milk by water:

• A. Hydrometer
• B. Penetrometer
• C. Lactometer
• D. Colorimeter

Hint:

Lactometers are essential tools in the dairy industry to ensure the quality and purity of milk by detecting any water adulteration.

Answer 1

The Correct Option is C

A lactometer is an instrument specifically designed to test the specific gravity of milk. It helps to determine the purity of the milk and check for any adulteration, particularly the presence of water in the milk. The lactometer floats in the milk, and the level at which it floats gives an indication of the specific gravity. If water has been added to the milk, the lactometer will float higher, indicating lower specific gravity.
A hydrometer is used to measure the specific gravity of liquids in general, but it is not specifically designed for milk.
A penetrometer is used to measure the firmness or consistency of materials, not the specific gravity.
A colorimeter is used to measure the color intensity of liquids, not related to specific gravity or adulteration of milk.
Thus, the correct instrument for testing the specific gravity of milk and checking for adulteration is the lactometer.