Q. By increasing the temperature, the specific resistance of a conductor and a semiconductor-
(i) increases for both.
(ii) decreases for both.
(iii) increases for a conductor and decreases for a semiconductor.
(iv) decreases for a conductor and increases for a semiconductor.
Answer: (iii) increases for a conductor and decreases for a semiconductor.
Specific resistance of a conductor increases and for a semiconductor decreases with increase in temperature because for a conductor, a temperature.
coefficient of resistivity α = + ve
and for a semiconductor, α = -ve