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 26 of 33
- A. P-type
- B. Minority carriers
- C. Insulator
- D. None of these
Explanation: At absolute zero temperature (0 Kelvin or -273.15 degrees Celsius), a semiconductor tends to act more like an insulator.
Correct answer: Insulator- A. Reflection
- B. Rectification
- C. Reactivity
- D. None of these
Explanation: Rectification is the process of converting alternating current (AC) into direct current (DC) by removing the negative portion of the…
Correct answer: Rectification- A. Hand
- B. Digital
- C. Simple
- D. None of these
Explanation: LEDs (Light-Emitting Diodes) are commonly used in digital watches. They provide the display illumination and are known for their low power…
Correct answer: Digital- A. Electronic
- B. Digit
- C. Lamp
- D. Panel
Explanation: Electronic calculators typically use various electronic components, including integrated circuits (ICs), transistors, resistors…
Correct answer: Electronic- A. Nitrogen
- B. Oxygen
- C. Carbon
- D. Silicon
Explanation: A photodiode is a semiconductor device typically made from materials like silicon or germanium.
Correct answer: Silicon- A. Electrical
- B. Simple
- C. Metal
- D. Diode
Explanation: A photovoltaic cell converts light energy into electrical energy. When light photons strike the semiconductor material within the…
Correct answer: Electrical- A. Electric
- B. Photo
- C. Positive
- D. Diode
Explanation: Solar cells are used in satellites and space vehicles. These devices, also known as photovoltaic cells, harness sunlight and convert it…
Correct answer: Photo- A. Ampere
- B. Transistor
- C. Voltage
- D. None of these
Explanation: A transistor is a semiconductor device that can amplify both current and voltage.
Correct answer: Voltage- A. Two
- B. Three
- C. Five
- D. Four
Explanation: PNP and NPN refer to the two main types of transistors based on the arrangement of their semiconductor materials:1.
Correct answer: Two- A. n-P-n transistor
- B. n-n-p transistor
- C. p -p-n transistor
- D. None of these
Explanation: PNP and NPN refer to the two main types of transistors based on the arrangement of their semiconductor materials:1.
Correct answer: n-P-n transistor- A. Middle point
- B. Base
- C. Perpendicular
- D. Transistor
Explanation: The middle portion of a transistor is called the base. Whether it's an NPN or PNP type, the base is the central region between the emitter…
Correct answer: Base- A. Amplification
- B. Transistor
- C. Output
- D. Input
Explanation: The process that converts low voltage signals to high voltage is called "amplification." Amplification involves increasing the strength or…
Correct answer: Amplification- A. John Bardeen
- B. Henry
- C. John Henry
- D. Joule
Explanation: The invention of the transistor is credited to a team of researchers at Bell Laboratories in 1947.
Correct answer: John Bardeen- A. Decreases inversely
- B. Increases inversely
- C. Increases directly
- D. Remains unchanged
Explanation: The electric field induced by a changing magnetic flux follows an inverse relationship with distance from the region of changing magnetic…
Correct answer: Decreases inversely- A. The magnetic flux
- B. Change of magnetic flux
- C. Rate of change of magnetic flux
- D. None of these
Explanation: The strength of the electric field induced by a changing magnetic flux depends on a couple of factors:1.
Correct answer: Rate of change of magnetic flux- A. An electric field
- B. A magnetic field
- C. Gravitational field
- D. None of these
Explanation: A changing electric flux can develop in a region when the electric field passing through a surface changes over time.
Correct answer: A magnetic field- A. Electromagnetic waves
- B. Sound waves
- C. Water waves
- D. None of these
Explanation: A changing electric flux can indeed give rise to electromagnetic waves (EMW).
Correct answer: Electromagnetic waves- A. Electric and magnetic fields moving parallel to each other
- B. Electric and magnetic fields moving at right angle to each other
- C. Electric field moving with velocity of light
- D. Magnetic field moving with velocity of light
Explanation: Electromagnetic waves (EMW) consist of oscillating electric and magnetic fields that propagate through space.
Correct answer: Electric and magnetic fields moving at right angle to each other- A. Electrons
- B. Sound
- C. Light
- D. α -particle
Explanation: Electromagnetic waves propagate in free space with the speed of light, approximately 3×10⁸ meters per second.
Correct answer: Light- A. Light waves
- B. Sound waves
- C. Water waves
- D. Waves along a stretched string
Explanation: Light is an example of an electromagnetic wave. It's part of the electromagnetic spectrum, which includes a range of waves varying in…
Correct answer: Light waves