[amp_mcq option1=”remains constant” option2=”decreases” option3=”increases” option4=”None of the above ” correct=”option2″]
The correct answer is (b). The resistance of a semiconductor decreases on heating. This is because the increase in temperature causes the electrons to move more freely, which in turn decreases the resistance.
Option (a) is incorrect because the resistance of a semiconductor does not remain constant on heating. Option (c) is incorrect because the resistance of a semiconductor decreases on heating, not increases. Option (d) is incorrect because the resistance of a semiconductor does change on heating.