A simple hydrometer consists of uniform cylinder suitably weighted to float upright in most common liquids. It is graduated to read the relative density of a liquid directly. Which of the following is NOT correct?

• A.When placed in a liquid, it displaces exactly its own weight of the liquid
• B.Its graduation increases from top to base
• C.When placed in a liquid, it displaces exactly its own volume of the liquid
• D.The product of the volume and density of liquid displaced is equal to its mass