Which of the following is an application of Archimedes' principle?
- Used in designing ships and submarines
- Used in Lactometers
- Used in Hydrometer
- All of these
Correct Answer: Option(d)
Solution: Archimedes' principle is used in designing ships and submarines. Lactometers, which are used to determine the purity of a sample of milk and hydrometers used for determining density of liquids, are based on this principle, hence option is correct.