Question
Question: A brass disc fits simply in a hole of a steel plate. The disc from the hole can be loosened if the s...
A brass disc fits simply in a hole of a steel plate. The disc from the hole can be loosened if the system
A
First heated then cooled
B
First cooled then heated
C
Is heated
D
Is cooled
Answer
Is cooled
Explanation
Solution
Since, the coefficient of linear expansion of brass is greater than that of steel. On cooling, the brass contracts more, so, it get loosened.