Question

A tight metal lid on a jam jar loosens when it is held upside down in hot water because the hot water causes the
(a) glass jar to contract.
(b) metal lid to contract.
(c) glass jar to expand more than the metal lid.
(d) metal lid to expand more than the glass jar.

Answer 1

(d) metal lid to expand more than the glass jar
Metal is a good conductor of heat than the glass. So, metal lid expands more than the glass jar.