Question

A metallic ball has a spherical cavity at its center. If the ball is heated,the following happens to the cavity:

• A. Its volume decreases.
• B. Its volume remains constant.
• C. Its volume increases.
• D. Nothing can be decided.

Answer 1

Answer: (C)

The metal ball can be considered to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e. the volume of the hollow portion will also increase.