A) X is P-type, Y is N-type and the junction is forward biased
B) X is N-type, Y is P-type and the junction is forward biased
C) X is P-type, Y is N-type and the junction is reverse biased
D) X is N-type, Y is P-type and the junction is reverse biased
Correct Answer: D
Solution :
Arsenic has five valence electrons, so it a donor impurity. Hence X becomes N-type semiconductor Indium has only three outer electrons, so it is an acceptor impurity. Hence Y becomes P-type semiconductor. Also N (i.e., X) is connected to positive terminal of battery and P(i.e., Y) is connected to negative terminal of battery so PN-junction is reverse biased.
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