Electronics MCQ Questions and Answers

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Q1
For a common emitter circuit if IC/IE = 0.98 then current gain for common emitter circuit will be
  • A 49
  • B 98
  • C 4.9
  • D 25.5
Answer: Option A
Q2
In a p-n junction
  • A The potential of the p and n sides becomes higher alternately
  • B The p side is at higher electrical potential than the n side
  • C The n side is at higher electrical potential than the p side
  • D Both the p and n sides are at the same potential
Answer: Option B
Q3
In the case of a common emitter transistor amplifier the ratio of the collector current to the emitter current Ic/Ie is 0.96. The current gain of the amplifier is ?
  • A 6
  • B 48
  • C 24
  • D 12
Answer: Option C
Q4
if a full wave rectifier circuit is operating from 5oHz mains, the fundamental frequency in the tipple will be
  • A 100Hz
  • B 25Hz
  • C 50Hz
  • D 70.7 Hz
Answer: Option A
Q5
A n-p-n transistor conducts when ?
  • A both collector and emitter are negative with respect to, the base
  • B both collector and emitter are positive with respect to the base
  • C collector is positive and emitter is negative with to the base
  • D collector is positive and emitter is at same potential as the base
Answer: Option C
Q6
Barrier potential of a p-n junction diode does not depend on?
  • A doping density
  • B diode design
  • C temperature
  • D forward bias
Answer: Option B
Q7
Reverse bias applied to a junction diode
  • A increases the minority carrier current
  • B lowers the potential barrier
  • C raises the potential barrier
  • D increases the majority carrier current
Answer: Option C
Q8
In semiconductors at a room temperature
  • A the conduction band is completely empty
  • B the valence band is partially empty and the conduction band is partially filled
  • C the valence band is completely filled and the conduction band is partially filled
  • D the valence band is completely filled
Answer: Option C
Q9
The output of OR gate is 1 when?
  • A if either input is zero
  • B if both inputs are zero
  • C if either or both inputs are 1
  • D only if both inputs are I
Answer: Option C
Q10
In a p-n junction photo cell, the value of the photo-electromotive force produced by monochromatic light is proportional to ?
  • A the voltage applied at the p-n junction
  • B the barrier voltage at the p-n junction
  • C the intensity of the light falling on the cell
  • D the frequency of the light falling on the cell
Answer: Option C

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