CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2006

  • question_answer
    To a germanium crystal equal number of aluminium and indium atoms are added. Then:

    A)  it remains an intrinsic semiconductor

    B)  it becomes a n-type semiconductor

    C)  it becomes a p-type semiconductor

    D)  it becomes an insulator

    Correct Answer: C

    Solution :

    If trivalent impurity is mixed with pure germanium crystal, the crystal so obtained is called p-type semiconductor. Here, aluminium and indium atoms are trivalent impurity atoms.


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