Semiconductor Theory(Electrical Engineering Questions ) Questions and Answers

Question 1. 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
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. A hole and electron in close proximity would tend to________________?
  1.    Repel each other
  2.    Attract each other
  3.    Have no effect on each other
  4.    None of the above
Explanation:-
Answer: Option B. -> Attract each other
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. 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
Explanation:-
Answer: Option A. -> Diffusion
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. The barrier voltage at a pn junction for germanium is about________________?
  1.    5 V
  2.    3 V
  3.    Zero
  4.    0.3 V
Explanation:-
Answer: Option D. -> 0.3 V
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. A reverse bias pn junction has_____________?
  1.    Very narrow depletion layer
  2.    Almost no current
  3.    Very low resistance
  4.    Large current flow
Explanation:-
Answer: Option B. -> Almost no current
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. A reverse biased pn junction has resistance of the order of________________?
  1.    O
  2.    kO
  3.    MO
  4.    None of the above
Explanation:-
Answer: Option C. -> MO
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. 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
Explanation:-
Answer: Option A. -> Equals the number of holes
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. 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
Explanation:-
Answer: Option B. -> Holes and electrons
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. The battery connections required to forward bias a pn junction are_________________?
  1.    +ve terminal to p and –ve terminal to n
  2.    -ve terminal to p and +ve terminal to n
  3.    -ve terminal to p and –ve terminal to n
  4.    None of the above
Explanation:-
Answer: Option A. -> +ve terminal to p and –ve terminal to n
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. A pn junction acts as a__________________?
  1.    Controlled switch
  2.    Bidirectional switch
  3.    Unidirectional switch
  4.    None of the above
Explanation:-
Answer: Option C. -> Unidirectional switch
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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