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.
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Read the Electronics notesFree MDCAT chapter notes with key terms660 questions · page 11 of 33
- A. 0.9v
- B. 0.6v
- C. 0.5v
- D. 6.0v
Explanation: Individual solar cell devices are often the electrical building blocks of photovoltaic modules, known colloquially as "solar panels".
Correct answer: 0.6v- A. A few mA
- B. A few A
- C. A few ampere
- D. I A
Explanation: In general, a typical commercially-available silicon cell produces a current between 28 and 35 milliamps per square centimeter.
Correct answer: A few mA- A. Reverse biased
- B. Forward biased
- C. Both (a) and (b)
- D. None of these
Explanation: An LED is a light emitting diode. The LED emits light when it is forward biased and it emits no light when it is reverse biased.
Correct answer: Forward biased204. The specialy designed semi conductor diodes used as indicator lamps in electronic circuits are:
- A. The switch
- B. The light emitting diode
- C. The photo diode
- D. Solar cells
Explanation: Light emitting diodes are used as indicator lamps.
Correct answer: The light emitting diode- A. Photo diodes
- B. Light emitting diode
- C. Photo voltaic cell
- D. Solar cell
Explanation: Photo diode is linear and has low resistance. Further, it has a very good spectral response.
Correct answer: Photo diodes- A. P-N junction
- B. N-N-junction
- C. P-P junction
- D. None of the above
Explanation: When P-type and N-type come into contact, carriers, which are holes and free electrons, are attracted to each other, recombine at the…
Correct answer: P-N junction- A. Reverse biased
- B. Forward biased
- C. Neutral
- D. None of these
Explanation: By convention, forward biasing of diode is defined in such a way that the positive terminal of the battery is connected to the anode…
Correct answer: Forward biased- A. Diode junction may break down
- B. Voltage drops to zero
- C. Voltage becomes maximum
- D. None of these
Explanation: On increasing the in the reverse bias to a large value in the p-n junction diode then the value of current will suddenly increase.
Correct answer: Diode junction may break down- A. Two way conduction
- B. One way conduction
- C. Zero conduction
- D. None of these
Explanation: A diode is a circuit element that allows electric current to flow in only one direction, like a one-way valve .
Correct answer: One way conduction- A. Forward biased
- B. Reverse biased
- C. Zero biased
- D. Not biased
Explanation: If the positive terminal of the battery is connected to the n-type and the negative terminal is connected to the p-type, the diode is said…
Correct answer: Reverse biased- A. Half wave rectification
- B. Full wave rectification
- C. Saturation
- D. Amplification
Explanation: For most power applications, half-wave rectification is insufficient for the task.
Correct answer: Half wave rectification- A. Three diodes
- B. Four diodes
- C. Two diodes
- D. One diode
Explanation: Bridge rectifiers are the type of full-wave rectifier that uses four or more diodes in a bridge circuit configuration.
Correct answer: Four diodes- A. John Bardeen
- B. l-carrie
- C. G Bell
- D. Young
Explanation: The transistor was successfully demonstrated on December 23, 1947 atBell Laboratories in Murray Hill, New Jersey.
Correct answer: John Bardeen214. A transistor has:
- A. Two region
- B. One region
- C. Three region
- D. Four region
Explanation: Bipolar Junction Transistors have three semiconductor regions. The three regions are the emitter region (E), base region (B), and the…
Correct answer: Three region- A. The base-emitter junction should be forward biased
- B. The base-emitter junction should be reverse biased
- C. The base-colector junction should be forward biased
- D. None of these
Explanation: The transistor will function as an amplifier by increasing the intensity of a weak signal.
Correct answer: The base-emitter junction should be forward biased216. Usually VBB is:
- A. Larger than VCC
- B. Smaller than Vcc
- C. Equal to Vcc
- D. None of these
Explanation: VCC is the Collector to Ground DC Bias VoltageVCE is the Colletor to emeitter Voltage ; It is equal to VCC when transitor is OFF ; and…
Correct answer: Larger than VCC- A. Base-collector terminals
- B. Base emitter terminals
- C. Collector emitter terminals
- D. None of these
Explanation: Using a transistor as a switch is the simplest application of the device.
Correct answer: Base emitter terminals- A. At zero value
- B. At maximum value
- C. At minimum value
- D. None of these
Explanation: With a zero signal applied to the Base of the transistor it turns "OFF" acting like an open switch and zero collector current flows.
Correct answer: At zero value- A. Located on the base
- B. Located on the collector
- C. Located on the emitter
- D. None of these
Explanation: The arrow on the symbol for bipolar transistorsindicates the PN junction between base and emitter and points in the direction in which…
Correct answer: Located on the emitter- A. Transfer of resistance
- B. Transfer of current
- C. Transfer of charge
- D. Transfer of energy
Explanation: The term 'transistor' is derived from the words 'transfer' and 'resistor.
Correct answer: Transfer of resistance