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MCQs

Total Questions : 90 | Page 8 of 9 pages
Question 71. The output, V-I characteristics of an Enhancement type MOSFET has
  1.    Only an ohmic region
  2.    An ohmic region at low voltage value followed by a saturation region at higher voltages
  3.    An ohmic region at large voltage values preceded by a saturation region at lower voltages
  4.    Only a saturation region
 Discuss Question
Answer: Option B. -> An ohmic region at low voltage value followed by a saturation region at higher voltages
Question 72. Assertion (A): A p-n junction has high resistance in reverse direction.Reason (R): When a reverse bias is applied to p-n junction, the width of depletion layer increases.
  1.    A is true but R is false
  2.    Both A and R are true but R is not a correct explanation of A
  3.    A is false but R is true
  4.    Both A and R are true and R is correct explanation of A
 Discuss Question
Answer: Option D. -> Both A and R are true and R is correct explanation of A
Question 73. In a bipolar transistor, the base collector junction has
  1.    Zero or forward bias
  2.    Forward bias
  3.    Reverse bias
  4.    Zero bias
 Discuss Question
Answer: Option C. -> Reverse bias
Question 74. The amount of photoelectric emission current depends on
  1.    Intensity of incident radiation
  2.    Both frequency and intensity of incident radiation
  3.    Frequency of incident radiation
  4.    None of these
 Discuss Question
Answer: Option B. -> Both frequency and intensity of incident radiation
Question 75. In the sale of diamonds the unit of weight is carat. One carat is equal to
  1.    200 mg
  2.    150 mg
  3.    500 mg
  4.    100 mg
 Discuss Question
Answer: Option A. -> 200 mg
Question 76. Piezoelectric quartz crystal resonators find application where
  1.    Signal frequency control is required
  2.    Rectification of the signal is required
  3.    Signal amplification is required
  4.    Modulation of signal is required
 Discuss Question
Answer: Option B. -> Rectification of the signal is required
Question 77. Which of the following could be the maximum current rating of junction diode by 126?
  1.    1 A
  2.    100 A
  3.    20 A
  4.    10 A
 Discuss Question
Answer: Option A. -> 1 A
Question 78. The sensitivity of human eyes is maximum at
  1.    Violet portion of spectrum
  2.    Green portion of spectrum
  3.    Red portion of spectrum
  4.    White portion of spectrum
 Discuss Question
Answer: Option B. -> Green portion of spectrum
Question 79. The most commonly used semiconductor material is
  1.    Mixture of silicon and germanium
  2.    Germanium
  3.    None of these
  4.    Silicon
 Discuss Question
Answer: Option D. -> Silicon
Question 80. Forbidden energy gap in germanium at 0 K is about
  1.    10 eV
  2.    5 eV
  3.    2 eV
  4.    0.78 eV
 Discuss Question
Answer: Option D. -> 0.78 eV

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