Use the following information to answer the next question.
Four pins (I, II, III, and IV) are fixed to a metallic rod with the help of wax. The rod is heated at one end.
Which of the following pins would drop first?
On heating, the wax melts. Heat is transferred from the hotter end to the colder end of an object by the process of conduction. Thus, heat is transferred from the end nearest to the flame to the other end. Thus, pin I which is nearest to the flame will drop first.