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NEET 1998 (AIPMT) · P-N Junction Diode

P-N Junction Diode question from NEET 1998 (AIPMT)

Q126NEET 1998 · AIPMTEasy

P-N Junction Diode

A semi-conducting device is connected in a series in circuit with a battery and a resistance. A current is allowed to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be

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Answer: (a)

A pure or doped single semiconductor ( $p$ , $n$ or intrinsic) conducts equally for both polarities.
Only a $p\text{-}n$ junction conducts in forward bias and gives almost zero current in reverse bias.
So the answer is (a) a $p\text{-}n$ junction.

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