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  3. 12th Class
  4. Physics
  5. Semiconducting Devices

12th Class Physics Semiconducting Devices Question Bank MCQs - Semiconductor Electronics: Materials, Devices and Simple Circuits

  • question_answer
    Tetra valent semiconductor is to be doped with __ valent element to achieve ___ type extrinsic semiconductor.

    A) penta, n

    B) tri, p

    C) penta, p

    D) both [a] and [b]

    Correct Answer: D

    Solution :

    Option [d] is correct.
    Explanation: When a semiconductor having 4 valence electrons is doped with an element having 3 valence electrons, then an excess hole is generated and the semiconductor becomes p-type extrinsic semiconductor.
    When a semiconductor having 4 valence electrons is doped with an element having 5 valence electrons, then an excess electron becomes available and the semiconductor becomes n-type extrinsic semiconductor.


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