Question

A hole is drilled in a copper sheet. The diameter of the hole is $4.24\text{cm}$ at $27{}^{\circ }\text{C}$. Diameter of the hole when it is heated to $35{}^{\circ }\text{C}$ is

• A. Less than $4.24\text{cm}$
• B. Equal to $4.24\text{cm}$
• C. More than $4.24\text{cm}$
• D. Data insufficient

Answer 1

The correct option is C More than $4.24\text{cm}$

We know that metals expands on heating. Therefore, the diameter of the hole should increase as temperature is raised from $27{}^{\circ }\text{C}$ to $35{}^{\circ }\text{C}$.