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MCQs

Total Questions : 90 | Page 2 of 9 pages
Question 11. Power diodes are generally
  1.    Silicon diodes
  2.    Germanium diodes
  3.    Either of the above
  4.    None of the above
 Discuss Question
Answer: Option A. -> Silicon diodes
Question 12. Silicon is not suitable for fabrication of light emitting diodes because it is
  1.    An indirect band gap semiconductor
  2.    Direct band gap semiconductor
  3.    Wideband gap semiconductor
  4.    Narrowband gap semiconductor
 Discuss Question
Answer: Option A. -> An indirect band gap semiconductor
Question 13. Free electrons exist in
  1.    First band
  2.    Second band
  3.    Third band
  4.    Conduction band
 Discuss Question
Answer: Option D. -> Conduction band
Question 14. Which variety of copper has the best conductivity?
  1.    Pure annealed copper
  2.    Hard drawn copper
  3.    Induction hardened copper
  4.    Copper containing traces of silicon
 Discuss Question
Answer: Option A. -> Pure annealed copper
Question 15. When avalanche breakdown occurs covalent bonds are not affected.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 16. In a half wave rectifier, the load current flows
  1.    Only for the positive half cycle of the input signal
  2.    Only for the negative half cycle of the input signal
  3.    For full cycle
  4.    For less than fourth cycle
 Discuss Question
Answer: Option A. -> Only for the positive half cycle of the input signal
Question 17. How many free electrons does a p type semiconductor has?
  1.    Only those produced by thermal energy
  2.    Only those produced by doping
  3.    Those produced by doping as well as thermal energy
  4.    Any of the above
 Discuss Question
Answer: Option A. -> Only those produced by thermal energy
Question 18. Assertion (A): In p-n-p transistor collector current is termed negative.Reason (R): In p-n-p transistor holes are majority carriers.
  1.    Both A and R are true and R is correct explanation of A
  2.    Both A and R are true but R is not a correct explanation of A
  3.    A is true but R is false
  4.    A is false but R is true
 Discuss Question
Answer: Option B. -> Both A and R are true but R is not a correct explanation of A
Question 19. In a bipolar transistor, the emitter base junction has
  1.    Forward bias
  2.    Reverse bias
  3.    Zero bias
  4.    Zero or reverse bias
 Discuss Question
Answer: Option A. -> Forward bias
Question 20. Light dependent resistors are
  1.    Highly doped semiconductor
  2.    Intrinsic semiconductor
  3.    Lightly doped semiconductor
  4.    Either A or B
 Discuss Question
Answer: Option C. -> Lightly doped semiconductor

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