Semiconductor Theory(Electrical Engineering ) Questions and Answers

Question 1. A forward biased pn junction diode has a resistance of the order of
  1.    Ω
  2.    kΩ
  3.    MΩ
  4.    None of the above
Explanation:-
Answer: Option A. -> Ω
Question 2. A reverse biased pn junction has resistance of the order of
  1.    Ω
  2.    kΩ
  3.    MΩ
  4.    None of the above
Explanation:-
Answer: Option C. -> MΩ
Question 3. At room temperature, an intrinsic semiconductor has ___________
  1.    Many holes only
  2.    A few free electrons and holes
  3.    Many free electrons only
  4.    No holes or free electrons
Explanation:-
Answer: Option B. -> A few free electrons and holes
Question 4. A semiconductor has ___________ temperature coefficient of resistance.
  1.    Positive
  2.    Zero
  3.    Negative
  4.    None of the above
Explanation:-
Answer: Option C. -> Negative
Question 5. At absolute temperature, an intrinsic semiconductor has ___________
  1.    A few free electrons
  2.    Many holes
  3.    Many free electrons
  4.    No holes or free electrons
Explanation:-
Answer: Option D. -> No holes or free electrons
Question 6. 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
Explanation:-
Answer: Option B. -> The incomplete part of an electron pair bond
Question 7. The leakage current in a pn junction is of the order of
  1.    Aa
  2.    mA
  3.    kA
  4.    µA
Explanation:-
Answer: Option D. -> µA
Question 8. 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
Explanation:-
Answer: Option A. -> Decreases
Question 9. 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
Explanation:-
Answer: Option B. -> Minority carriers
Question 10. A semiconductor is formed by bonds.
  1.    Covalent
  2.    Electrovalent
  3.    Co-ordinate
  4.    None of the above
Explanation:-
Answer: Option A. -> Covalent
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