Topic: Strength of Materials
An unconstraint thin circular disc has a concentric hole in it. On heating the diameter of the hole will
- A. increase
- B. decrease
- C. Remain constant
- D. first increase then decrease
Answer: B. decrease
Explanation: According to the provided solution, after heating the metal tends to elongate, it will also elongate towards the center of the concentric hole to fill some part of the hole and make its diameter small.