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MCQs

Total Questions : 67 | Page 3 of 7 pages
Question 21. In a semiconductor, current conduction is due to
  1.    Only holes
  2.    Only free electrons
  3.    Holes and free electrons
  4.    None of the above
 Discuss Question
Answer: Option C. -> Holes and free electrons
Question 22. As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ___________
  1.    Remains the same
  2.    Increases
  3.    Decreases
  4.    None of the above
 Discuss Question
Answer: Option C. -> Decreases
Question 23. When a pentavalent impurity is added to a pure semiconductor, it becomes
  1.    An insulator
  2.    An intrinsic semiconductor
  3.    p-type semiconductor
  4.    n-type semiconductor
 Discuss Question
Answer: Option D. -> n-type semiconductor
Question 24. The barrier voltage at a pn junction for germanium is about
  1.    5.0 V
  2.    3.0 V
  3.    Zero
  4.    0.3 V
 Discuss Question
Answer: Option D. -> 0.3 V
Question 25. In the depletion region of a pn junction, there is a shortage of
  1.    Acceptor ions
  2.    Holes and electrons
  3.    Donor ions
  4.    None of the above
 Discuss Question
Answer: Option B. -> Holes and electrons
Question 26. A trivalent impurity has valence electrons
  1.    4
  2.    5
  3.    6
  4.    3
 Discuss Question
Answer: Option D. -> 3
Question 27. The random motion of holes and free electrons due to thermal agitation is called ___________
  1.    Diffusion
  2.    Pressure
  3.    Ionisation
  4.    None of the above
 Discuss Question
Answer: Option A. -> Diffusion
Question 28. The leakage current across a pn junction is due to ___________
  1.    Minority carriers
  2.    Majority carriers
  3.    Junction capacitance
  4.    None of the above
 Discuss Question
Answer: Option A. -> Minority carriers
Question 29. When a pure semiconductor is heated, its resistance ___________
  1.    Goes up
  2.    Goes down
  3.    Remains the same
  4.    Can?t say
 Discuss Question
Answer: Option B. -> Goes down
Question 30. A reverse bias pn junction has ___________
  1.    Very narrow depletion layer
  2.    Almost no current
  3.    Very low resistance
  4.    Large current flow
 Discuss Question
Answer: Option B. -> Almost no current

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