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NEET AIPMT SOLVED PAPER 1998

  • question_answer
                    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:

    A)                 a p-n junction                   

    B)                 an intrinsic semiconductor

    C)                 a p-type semiconductor                                               

    D)                 an n-type semiconductor

    Correct Answer: A

    Solution :

                    When the connection of battery is reversed, then a semiconducting device is reverse biased. We know that in forward biasing of \[p-n\] junction the current is of the order of milliampere while in reverse biasing the current is of the order of microampere (negligible). Thus, device is a \[p-n\] junction.


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