Free Electronics MCQs with Answers
660 Electronics MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
Last updated
Read the Electronics notesFree MDCAT chapter notes with key terms660 questions · page 29 of 33
- A. A detector
- B. A modulator
- C. A rectifier
- D. An amplifier
Explanation: A diode can actually be used for rectification, detection, and modulation but not for amplification:1.
Correct answer: An amplifier- A. Decreases
- B. Increases
- C. Remains same
- D. All of these
Explanation: Doping a semiconductor can increase its electrical conductivity.In N-type doping, the addition of pentavalent impurities increases the…
Correct answer: Increases- A. At absolute zero temperature, the conduction band of a semiconductor is completely filled and the valence band is totally empty.
- B. At absolute zero temperature, the conduction band of semiconductor is totally empty and valance band is totally filled
- C. At absolute zero temperature, both conduction band and valence band of a semiconductor are totally empty.
- D. At absolute zero temperature, both conduction band and valence band of a semiconductor are completely filled.
Explanation: At absolute zero temperature (0 K), a semiconductor behaves like an insulator.
Correct answer: At absolute zero temperature, the conduction band of semiconductor is totally empty and valance band is totally filled- A. Electronic
- B. Digital
- C. Lamp
- D. Panel
Explanation: Electronic calculators typically use various electronic components, including integrated circuits (ICs), transistors, resistors…
Correct answer: Electronic- A. Apathetic ...comfortable
- B. Bewildered ... bizarre
- C. Determined ...disorderly
- D. Considerate...modern
Explanation: The first step is to examine the first word of each choice. We eliminate Choice B, bewildered, and Choice D, considerate, because the…
Correct answer: Determined ...disorderly- A. At twenty-eight, he won prize of the tragedy competition, on his first entry.
- B. At twenty-eight, he won the prize of the tragedy competition, with his first entry.
- C. At twenty-eight, he won the prize of the tragedy competition, with his the first entry.
- D. At twenty-eight, he won the prize of the tragedy competiton over his first entry.
Explanation: The correct answer is B. At twenty-eight, he won the prize of the tragedy competition, with his first entry.
Correct answer: At twenty-eight, he won the prize of the tragedy competition, with his first entry.- A. Syllables
- B. Helpfulness
- C. Achievements
- D. Parables
Explanation: Parables are stories or fables that illustrate a moral or ethical point while relating a simple incident. Hence this option is correct.
Correct answer: Parables- A. If only I is most appropriate
- B. If only II is most appropriate
- C. If either I or II is most appropriate
- D. If neither I nor II is most appropriate
Explanation: The child has already ignored "repeated warnings," so another threat (Action I) is unlikely to be effective.
Correct answer: If only II is most appropriate- A. If only I is most appropriate
- B. If only II is most appropriate
- C. If either I or II is most appropriate
- D. If neither I nor II is most appropriate
- E. If both I and II are most appropriate
Explanation: The explanation for this question will be added soon!
Correct answer: If both I and II are most appropriate- A. 7
- B. 8
- C. 9
- D. 6
Explanation: Each number in the sequence is derived by subtracting 2 from the previous number: 9 - 2 = 7.
Correct answer: 7- A. If only I is most appropriate
- B. If only II is most appropriate
- C. If either I or II is most appropriate
- D. If neither I nor II is most appropriate
Explanation: Withdrawing a notification designed to protect the environment (Action I) is an irresponsible solution.
Correct answer: If neither I nor II is most appropriate- A. Doping
- B. Temperature
- C. Voltage
- D. Pressure
Explanation: Pressure is the factor that does not affect the conductivity of a PN junction diode.
Correct answer: Pressure- A. 0.3v
- B. 0.5V
- C. 0.7V
- D. 1.1V
Explanation: The knee voltage for Germanium is approximately 0.3 volts. This is the point in the forward bias of a diode at which the current starts to…
Correct answer: 0.3v- A. 5.85A
- B. 1.15A
- C. 1.48A
- D. 0.67A
Explanation: IB =IE −IC Where:( IE ) is the emitter current( IC ) is the collector currentGiven that the emitter current ( IE ) is 3.5 A and the…
Correct answer: 1.15A- A. 0.3 V
- B. 0.7 V
- C. 0.5 V
- D. 5.0 V
Explanation: The potential difference across a silicon PN junction is 0.7 volt.
Correct answer: 0.7 V- A. Gallium
- B. Indium
- C. Germinium
- D. Silicon
Explanation: A potential barrier of 0.7 volts across a P-N junction is typically associated with a junction made from silicon.
Correct answer: Silicon577. If in a transistor both collector-base and base-emitter junctions are reversed biased then it is:
- A. Cut-off region
- B. region Act
- C. Active region
- D. point
Explanation: In a typical operation one junction (the base-emitter junction) is forward biased while the other (the base-collector junction) is reverse…
Correct answer: Cut-off region578. The type of impurity that has to be added to a semiconductor material so that it can provideholes is
- A. trivalent.
- B. tetravalent.
- C. pentavalent.
- D. monovalent.
Explanation: The type of impurity that needs to be added to a semiconductor material to provide holes is A) trivalent.Explanation:When a trivalent…
Correct answer: trivalent.- A. one input become low (0).
- B. one input become high (1).
- C. both inputs become low (0).
- D. both inputs become high (1).
Explanation: * Input A is 0, Input B is 0 (both inputs are low) * Input A is 0, Input B is 1 (one input is low) * Input A is 1, Input B is 0 (one input…
Correct answer: one input become low (0).580. The CORRECT symbol of a n-p-n transistor is(Note: Where 'E', 'B' and 'C' have their usual meaning.)
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The correct symbol of a n-p-n transistor is Emitter-Base-Collector, where the arrow points in the direction of conventional current flow.
Correct answer: Option A