Electronics MCQ Questions and Answers
Electronics MCQ Questions with Answers are a key part of preparation for competitive exams like GATE, ISRO, DRDO, and ECIL. These questions assess understanding of fundamental topics such as semiconductors, amplifiers, transistors, and digital circuits. Each question includes clear explanations, helping students grasp key concepts in less time. Practicing electronics MCQs not only boosts technical knowledge but also enhances problem-solving skills needed in both interviews and online test rounds.
Electronics MCQ
Showing 10 of
40 questions
1. For a common emitter circuit if IC/IE = 0.98 then current gain for common emitter circuit will be
- 49
- 98
- 4.9
- 25.5
2. In a p-n junction
- The potential of the p and n sides becomes higher alternately
- The p side is at higher electrical potential than the n side
- The n side is at higher electrical potential than the p side
- Both the p and n sides are at the same potential
3. 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 ?
- 6
- 48
- 24
- 12
4. if a full wave rectifier circuit is operating from 5oHz mains, the fundamental frequency in the tipple will be
- 100Hz
- 25Hz
- 50Hz
- 70.7 Hz
5. A n-p-n transistor conducts when ?
- both collector and emitter are negative with respect to, the base
- both collector and emitter are positive with respect to the base
- collector is positive and emitter is negative with to the base
- collector is positive and emitter is at same potential as the base
6. Barrier potential of a p-n junction diode does not depend on?
- doping density
- diode design
- temperature
- forward bias
7. Reverse bias applied to a junction diode
- increases the minority carrier current
- lowers the potential barrier
- raises the potential barrier
- increases the majority carrier current
8. In semiconductors at a room temperature
- the conduction band is completely empty
- the valence band is partially empty and the conduction band is partially filled
- the valence band is completely filled and the conduction band is partially filled
- the valence band is completely filled
9. The output of OR gate is 1 when?
- if either input is zero
- if both inputs are zero
- if either or both inputs are 1
- only if both inputs are I
10. In a p-n junction photo cell, the value of the photo-electromotive force produced by monochromatic light is proportional to ?
- the voltage applied at the p-n junction
- the barrier voltage at the p-n junction
- the intensity of the light falling on the cell
- the frequency of the light falling on the cell