question_answer

Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of \[P\] increases and that of Q decreases. We conclude that [MP PMT 1995; MP PET 2001]

A)            P and Q are conductors of different materials

B)            P is N-type semiconductor and Q is P-type semiconductor

C)            P is semiconductor and Q is conductor

D)            P is conductor and Q is semiconductor