WBCS.LIVE practice question

A metallic ball has a spherical cavity... what happens to the cavity?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Its volume decreases.
  2. Its volume increases.
  3. Its volume remains unchanged.
  4. Its volume may increase or decrease depending upon the nature of the metal.

Correct answer and explanation

Correct answer: Its volume increases.

Explanation: āœ… Correct Answer: B) Its volume increases. šŸ“š Explanation: When a metallic ball with a hole or cavity inside is heated, the entire ball expands. The cavity inside will expand in exactly the same way as if it were solid metal. Therefore, the 'volume of the cavity increases' when the temperature goes up. This is a common rule of thermal expansion that applies to all geometric shapes and empty spaces.