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MCQs

Total Questions : 848 | Page 3 of 85 pages
Question 21. The material which has zero temperature coefficient of resistance is
  1.    manganin
  2.    porcelain
  3.    carbon
  4.    aluminium
 Discuss Question
Answer: Option A. -> manganin
Answer: (a).manganin
Question 22. In a vacuum triode μ = rpgm.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 23. The conductivity of an intrinsic semiconductor is
  1.    generally less than that of a doped semiconductor
  2.    given by σ1 = eni (μn - μp)
  3.    given by σ1 = eni (μp + μn)
  4.    given by σ1 = ni (μn + μp)
 Discuss Question
Answer: Option C. -> given by σ1 = eni (μp + μn)
Answer: (c).given by σ1 = eni (μp + μn)
Question 24. At a P-N junction, the potential barrier is due to the charges on either side of the junction, which consists of
  1.    fixed donor and acceptor ions
  2.    majority carriers only
  3.    minority carriers only
  4.    both majority and minority carriers
 Discuss Question
Answer: Option A. -> fixed donor and acceptor ions
Answer: (a).fixed donor and acceptor ions
Question 25. The addition of n type impurity to intrinsic material creates allowable energy levels.
  1.    slightly below conduction band
  2.    slightly above conduction band
  3.    slightly below valence band
  4.    slightly above valence band
 Discuss Question
Answer: Option A. -> slightly below conduction band
Answer: (a).slightly below conduction band
Question 26. Which of the following material can be used in cable shields?
  1.    Copper
  2.    Aluminium
  3.    Cast iron
  4.    Lead
 Discuss Question
Answer: Option D. -> Lead
Answer: (d).Lead
Question 27. The on voltage and forward breakover voltage of an SCR depend on
  1.    gate current alone
  2.    band gap of semiconductor alone
  3.    gate current and semiconductor band gap respectively
  4.    semiconductor band gap and gate current respectively
 Discuss Question
Answer: Option D. -> semiconductor band gap and gate current respectively
Answer: (d).semiconductor band gap and gate current respectively
Question 28. Which of the following elements act as donor impurities?
1. Gold
2. Phosphorus
3. Boron
4. Antimony
5. Arsenic
6. Indium
Select the correct answer using the codes given below:
  1.    1, 2, 3
  2.    1, 2, 4, 6
  3.    3, 4, 5, 6
  4.    1, 4, 5
 Discuss Question
Answer: Option D. -> 1, 4, 5
Answer: (d).1, 4, 5
Question 29. The charge of an electron is
  1.    1.6 x 10¯¹⁷ coulomb
  2.    1.6 x 10¯¹⁹ coulomb
  3.    1.6 x 10¯²¹ coulomb
  4.    1.6 x 10¯²³ coulomb
 Discuss Question
Answer: Option B. -> 1.6 x 10¯¹⁹ coulomb
Answer: (b).1.6 x 10¯¹⁹ coulomb
Question 30. Assertion (A): The resistivity of intrinsic semiconductor decreases with increase in temperature.
Reason (R): The forbidden gap decreases with increase in temperature.
  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 A. -> Both A and R are true and R is correct explanation of A
Answer: (a).Both A and R are true and R is correct explanation of A

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