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MCQs

Total Questions : 67 | Page 2 of 7 pages
Question 11. At room temperature, an intrinsic silicon crystal acts approximately as
  1.    A battery
  2.    A conductor
  3.    An insulator
  4.    A piece of copper wire
 Discuss Question
Answer: Option C. -> An insulator
Question 12. A pn junction acts as a ___________
  1.    Controlled switch
  2.    Bidirectional switch
  3.    Unidirectional switch
  4.    None of the above
 Discuss Question
Answer: Option C. -> Unidirectional switch
Question 13. Addition of pentavalent impurity to a semiconductor creates many
  1.    Free electrons
  2.    Holes
  3.    Valence electrons
  4.    Bound electrons
 Discuss Question
Answer: Option A. -> Free electrons
Question 14. Addition of trivalent impurity to a semiconductor creates many
  1.    Holes
  2.    Free electrons
  3.    Valence electrons
  4.    Bound electrons
 Discuss Question
Answer: Option A. -> Holes
Question 15. In an intrinsic semiconductor, the number of free electrons
  1.    Equals the number of holes
  2.    Is greater than the number of holes
  3.    Is less than the number of holes
  4.    None of the above
 Discuss Question
Answer: Option A. -> Equals the number of holes
Question 16. A hole in a semiconductor is defined as ___________
  1.    A free electron
  2.    The incomplete part of an electron pair bond
  3.    A free proton
  4.    A free neutron
 Discuss Question
Answer: Option B. -> The incomplete part of an electron pair bond
Question 17. With forward bias to a pn junction , the width of depletion layer
  1.    Decreases
  2.    Increases
  3.    Remains the same
  4.    None of the above
 Discuss Question
Answer: Option A. -> Decreases
Question 18. The leakage current in a pn junction is of the order of
  1.    Aa
  2.    mA
  3.    kA
  4.    µA
 Discuss Question
Answer: Option D. -> µA
Question 19. A semiconductor is formed by bonds.
  1.    Covalent
  2.    Electrovalent
  3.    Co-ordinate
  4.    None of the above
 Discuss Question
Answer: Option A. -> Covalent
Question 20. When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on
  1.    Junction capacitance
  2.    Minority carriers
  3.    Majority carriers
  4.    None of the above
 Discuss Question
Answer: Option B. -> Minority carriers

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