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EEE :: Semiconductor Theory Multiple

  1. At room temperature, an intrinsic silicon crystal acts approximately as

  2. A.

     A battery

    B.

     A conductor

    C.

     An insulator

    D.

     A piece of copper wire


  3. A pn junction acts as a ___________

  4. A.

     Controlled switch

    B.

     Bidirectional switch

    C.

     Unidirectional switch

    D.

     None of the above


  5. Addition of pentavalent impurity to a semiconductor creates many

  6. A.

     Free electrons

    B.

     Holes

    C.

     Valence electrons

    D.

     Bound electrons


  7. Addition of trivalent impurity to a semiconductor creates many

  8. A.

     Holes

    B.

     Free electrons

    C.

     Valence electrons

    D.

     Bound electrons


  9. In an intrinsic semiconductor, the number of free electrons

  10. A.

     Equals the number of holes

    B.

     Is greater than the number of holes

    C.

     Is less than the number of holes

    D.

     None of the above


  11. A hole in a semiconductor is defined as ___________

  12. A.

     A free electron

    B.

     The incomplete part of an electron pair bond

    C.

     A free proton

    D.

     A free neutron


  13. With forward bias to a pn junction , the width of depletion layer

  14. A.

     Decreases

    B.

     Increases

    C.

     Remains the same

    D.

     None of the above


  15. A semiconductor is formed by bonds.

  16. A.

     Covalent

    B.

     Electrovalent

    C.

     Co-ordinate

    D.

     None of the above


  17. The leakage current in a pn junction is of the order of

  18. A.

     Aa

    B.

     mA

    C.

     kA

    D.

     µA


  19. When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on

  20. A.

     Junction capacitance

    B.

     Minority carriers

    C.

     Majority carriers

    D.

     None of the above