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 24 of 33
- A. Positively charge
- B. Negatively charge
- C. Both positively and negatively charge
- D. No mobile charge carrier
Explanation: Correct option is (d) No mobile charge carrier. This option is the correct one.
Correct answer: No mobile charge carrier- A. Allow current in one direction
- B. Allow current in both-directions
- C. Use as an amplifier
- D. Use as an oscillator
Explanation: A is the correct option. A diode is a semiconductor device that exhibits the property of rectification, which means it permits current to…
Correct answer: Allow current in one direction- A. Transfer of Resistance
- B. Transfer of charge carriers
- C. Transfer of power
- D. Transfer of voltage
Explanation: In summary, the correct option is: Transfer of voltage (Option d): Transistor stands for "Transfer of voltage." A transistor is a…
Correct answer: Transfer of voltage- A. Emitter
- B. Base
- C. Collector
- D. All have equal area
Explanation: Correct answer: Collector (Option c): The collector region of a transistor is the most wide in terms of area.
Correct answer: Collector- A. 10-2m
- B. 10-4m
- C. 10-6m
- D. 10-8m
Explanation: The most reasonable option is: c) 10^-6m A thickness of 10^-6m (0.000001m) for the base region of a transistor is a more reasonable value.
Correct answer: 10-6m- A. Ie=Ic-Ib
- B. Ie=Ia-Ic
- C. Ia=Ic/Ig
- D. β =Ib/Ie
Explanation: The explanation is given below: Ia = Ic / Ig represents the relationship between the collector current (Ic) and the total input current…
Correct answer: Ia=Ic/Ig- A. Ic=IB
- B. Ic=β IB
- C. IC=α IB
- D. IC=0
Explanation: The explanation is given below: Cut-off mode is when beta-emitter and beta-collector junctions are reverse biased so no current flows.
Correct answer: Ic=β IB- A. Emitter
- B. Base
- C. Collector
- D. All of them
Explanation: In an NPN transistor, the base controls the amount of current passing through it while allowing current flow from the emitter to the…
Correct answer: Base- A. 0.99mA
- B. 9.9μA
- C. 0.1mA
- D. 1mA
Explanation: The relation between collector current and base current is given by:Ic= βIb Where beta is 100 and base current is given 0.01mA,so…
Correct answer: 1mA- A. IC=0
- B. IC=IB
- C. IC=α IB
- D. IC=βIB
Explanation: Voltage drops when no current flows and this usually occurs when both the base-emitter and base-collector junctions are reversed biased so…
Correct answer: IC=βIB- A. Heavy loading of emitter current
- B. Excessive heat at collector terminal
- C. Distortion in the output signal
- D. Faulty location of load line
Explanation: Transistor Biasing is the process of setting a transistors DC operating voltage or current conditions to the correct level so that any AC…
Correct answer: Distortion in the output signal- A. Breakdown region
- B. Saturation and cutoff regions
- C. discrete region
- D. Linear region
Explanation: We can use the transistor in the digital circuits to obtain switching operation.
Correct answer: Saturation and cutoff regions- A. Out of the base lead
- B. Into the emitter
- C. Into the collector
- D. Into the base supply
Explanation: In an NPN transistor, the flow of current runs from the collector terminal to the emitter terminal.
Correct answer: Into the collector- A. Collector voltage
- B. Collector resistance
- C. Base current
- D. All of the above
Explanation: The correct option is base current. The collector current in a transistor is primarily controlled by the base current.
Correct answer: Base current- A. Magnetic field
- B. Perpendicular
- C. Permeability
- D. None of these
Explanation: The changing electric flux creates a magnetic field, and a changing magnetic flux creates an electric field.
Correct answer: Magnetic field- A. Magnetic field
- B. Charge
- C. Direction
- D. None of these
Explanation: An accelerating charged particle produces an electromagnetic (EM) wave.
Correct answer: Charge- A. Light
- B. Strength
- C. Sound
- D. None of these
Explanation: Electromagnetic waves travel in free space (like a vacuum) at the speed of light, denoted by the symbol "c." In a vacuum, electromagnetic…
Correct answer: Light- A. Longitude
- B. Magnetic permeability
- C. Electric field
- D. None of these
Explanation: In materials other than a vacuum, the velocity of electromagnetic waves indeed depends on both the electric permittivity and the magnetic…
Correct answer: Magnetic permeability- A. Antenna
- B. Coil
- C. Wire
- D. Straight
Explanation: Electromagnetic waves emitted from an antenna are indeed transverse in nature.
Correct answer: Antenna- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The equation relating to the natural frequency of an LC circuit is option B.
Correct answer: Option B