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NEET Physics Semiconducting Devices NEET PYQ-Semiconducting Devices

  • 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:                                                                                                                                                            [AIPMT 1998]

    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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