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EEE :: Semiconductor Theory Multiple

  1. In a semiconductor, current conduction is due to

  2. A.

     Only holes

    B.

     Only free electrons

    C.

     Holes and free electrons

    D.

     None of the above


  3. As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ___________

  4. A.

     Remains the same

    B.

     Increases

    C.

     Decreases

    D.

     None of the above


  5. When a pentavalent impurity is added to a pure semiconductor, it becomes

  6. A.

     An insulator

    B.

     An intrinsic semiconductor

    C.

     p-type semiconductor

    D.

     n-type semiconductor


  7. The barrier voltage at a pn junction for germanium is about

  8. A.

     5.0 V

    B.

     3.0 V

    C.

     Zero

    D.

     0.3 V


  9. In the depletion region of a pn junction, there is a shortage of

  10. A.

     Acceptor ions

    B.

     Holes and electrons

    C.

     Donor ions

    D.

     None of the above


  11. A trivalent impurity has valence electrons

  12. A.

     4

    B.

     5

    C.

     6

    D.

     3


  13. The random motion of holes and free electrons due to thermal agitation is called ___________

  14. A.

     Diffusion

    B.

     Pressure

    C.

     Ionisation

    D.

     None of the above


  15. The leakage current across a pn junction is due to ___________

  16. A.

     Minority carriers

    B.

     Majority carriers

    C.

     Junction capacitance

    D.

     None of the above


  17. When a pure semiconductor is heated, its resistance ___________

  18. A.

     Goes up

    B.

     Goes down

    C.

     Remains the same

    D.

     Can?t say


  19. A reverse bias pn junction has ___________

  20. A.

     Very narrow depletion layer

    B.

     Almost no current

    C.

     Very low resistance

    D.

     Large current flow