Question

metal ball cannot pass through the ring once it is heated.

Answer 1

before heating it passes as it is smaller than ring. But when it is heated, it expands and cannot fit into the ring, if it is cooled again it will fit

Answer 2

Answer: There can be two possibilities.

True, if the ring's size is little bigger than the metal ball.

False, if the ring is much bigger in circumference than the metal ball.

Explanation:

The Metal ball on heating, will expand is size. If the ring is closely of the same size, then the metal ball won't pass through the ring on heating.