Question

Hydrometer , Lactometer, Relative Density bottle, Eureka can find odd one out and give reason​

Answer 1

Relative density bottle is the answer of question

Answer 2

Eureka is the odd one out. The remaining are used to find the specific gravity of liquids while Eureka is a word used to celebrate a discovery or an invention.

Explanation:

• Hydrometer is a device used to measure the relative density or specific gravity of any liquid. It operates on the basis of Archimedes principle.
• Lactometer is a device used to measure the purity of milk. It also works on the basis of Archimedes principle.
• Relative density bottle is used to measure the relative density of a liquid.
• While Eureka is a word used to signify a "new invention" or "new discovery".

Hence Eureka is the odd one out, as rest are used to measure the relative densities of liquids.