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MCQs

Total Questions : 90 | Page 7 of 9 pages
Question 61. How many free electrons does a p type semiconductor has?
  1.    Only those produced by thermal energy
  2.    Those produced by doping as well as thermal energy
  3.    Any of the above
  4.    Only those produced by doping
 Discuss Question
Answer: Option A. -> Only those produced by thermal energy
Question 62. Light dependent resistors are
  1.    Highly doped semiconductor
  2.    Either A or B
  3.    Intrinsic semiconductor
  4.    Lightly doped semiconductor
 Discuss Question
Answer: Option D. -> Lightly doped semiconductor
Question 63. In a bipolar transistor, the emitter base junction has
  1.    Reverse bias
  2.    Forward bias
  3.    Zero or reverse bias
  4.    Zero bias
 Discuss Question
Answer: Option B. -> Forward bias
Question 64. The depletion layer width of Junction
  1.    Decreases with light doping
  2.    Increases with heavy doping
  3.    Is increased under reverse bias
  4.    Is independent of applied voltage
 Discuss Question
Answer: Option C. -> Is increased under reverse bias
Question 65. If too large current passes through the diode
  1.    Excessive heat may damage the diode
  2.    All electrons will leave
  3.    All holes will freeze
  4.    Diode will emit light
 Discuss Question
Answer: Option A. -> Excessive heat may damage the diode
Question 66. At room temperature the current in an intrinsic semiconductor is due to
  1.    Ions
  2.    Electrons
  3.    Holes
  4.    Holes and electrons
 Discuss Question
Answer: Option D. -> Holes and electrons
Question 67. An intrinsic silicon sample has 1 million free electrons at room temperature. As the temperature is increased
  1.    The number of free electrons and holes increase but not by the same amount
  2.    The number of free electrons and holes increase by the same amount
  3.    The number of free electrons increases but the number of holes decreases
  4.    The number of free electrons increases
 Discuss Question
Answer: Option B. -> The number of free electrons and holes increase by the same amount
Question 68. Which of the following has highest resistivity?
  1.    Air
  2.    Mineral oil
  3.    Mica
  4.    Paraffin wax
 Discuss Question
Answer: Option A. -> Air
Question 69. A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is
  1.    99
  2.    0.99
  3.    100
  4.    1.01
 Discuss Question
Answer: Option C. -> 100
Question 70. Work function is the maximum energy required by the fastest electron at 0 K to escape from the metal surface.
  1.    False
  2.    True
 Discuss Question
Answer: Option A. -> False

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