Question

A brass disc fits into a hole in an iron plate. To remove the disc

• A. the plate must be cooled
• B. the plate must be heated
• C. the plate may be heated (or) cooled
• D. the disc must be heated

Answer 1

Answer: (A)

the plate must be cooled

On cooling, the brass disc, owing to greater coefficeint of expansion, would contract more than the iron plate thus making it easier to remove it