Question

A semiconducting device is connected in a series circuit with a battery and a resistance.A current is found to pass through the circuit .If the polarity of the battery is reversed, the current drops to almost zero.The device may be
A. A P-type semiconductor
B. An N-type semiconductor
C. A PN-junction
D. An intrinsic semiconductor

Answer 1

Correct Answer - C
When polarity of the battery is reversed, the P-N junction becomes reverse biased so no current flows.