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 25 of 33
- A. 106 Hz
- B. 108 Hz
- C. 109 Hz
- D. 1011 Hz
Explanation: A frequency of 10⁶ Hz corresponds to 1 MHz (megahertz). This falls within the range of radio frequencies.
Correct answer: 106 Hz- A. Different
- B. Same
- C. Opposite
- D. None of these
Explanation: The velocity of electromagnetic waves and the velocity of light in a vacuum have the same value.
Correct answer: Same- A. 340 m/s
- B. 350 m/s
- C. 310 m/s
- D. 330 m/s
Explanation: At 0°C (which is the freezing point of water), sound waves travel through air at a speed of approximately 330 meters per second (or about…
Correct answer: 330 m/s- A. Microphone
- B. Television
- C. Radio
- D. None of these
Explanation: We can convert sound waves into electrical oscillations by using a device called a microphone.
Correct answer: Microphone- A. Audible
- B. Simple
- C. Electromagnet
- D. None of these
Explanation: The audible range refers to the range of frequencies that the average human ear can perceive. It spans from 20 to 20,000 Hertz (Hz).
Correct answer: Audible- A. Molecule
- B. Atom
- C. Crystal
- D. None of these
Explanation: The structure described is a cubic lattice or a three-dimensional grid-like arrangement of atoms or molecules.
Correct answer: Crystal- A. 14
- B. 15
- C. 16
- D. 19
Explanation: There are 14 fundamental types of space lattices, also known as Bravais lattices, that describe the ways atoms, molecules, or ions can be…
Correct answer: 14- A. Simple cube
- B. Face centered cube
- C. Free electron
- D. Simple square
Explanation: In a simple cubic lattice, each corner of a cube contains an atom or molecule, totaling eight in all.
Correct answer: Simple cube- A. Liquids
- B. Energy
- C. Solids
- D. Atom
Explanation: Band theory in physics classifies materials based on their electrical conductivity properties.
Correct answer: Solids- A. Insulator
- B. Semi-conductor
- C. Conductors
- D. None of these
Explanation: Insulators are materials that don't conduct electricity well because their electrons are tightly bound and don't move easily.
Correct answer: Insulator- A. Semi-conductor
- B. Insulator
- C. Conductors
- D. None of these
Explanation: Semiconductors have a smaller band gap than insulators. They can conduct electricity better than insulators but not as well as conductors.
Correct answer: Semi-conductor- A. 10-4 ohm - meter
- B. 108 ohm - meter
- C. 106 ohm - meter
- D. 1010 ohm - meter
Explanation: The Explanation for this question will be added soon!
Correct answer: 108 ohm - meter- A. Semi-conductors
- B. Electrons
- C. Circle
- D. Overlap
Explanation: Substances that have intermediate values of resistivity are called semiconductors.
Correct answer: Semi-conductors- A. Electrons
- B. Semi-conductors
- C. Conductors
- D. None of these
Explanation: The crystals of Germanium and Silicon are examples of semiconductors. Both elements are commonly used in electronic devices due to their…
Correct answer: Semi-conductors- A. 120°C
- B. 140°C
- C. Absolute Zero
- D. 90°C
Explanation: A pure semiconductor behaves like an insulator at absolute zero temperature (0 Kelvin or -273.15 degrees Celsius).
Correct answer: Absolute Zero- A. Intrinsic
- B. Hole
- C. Full
- D. None of these
Explanation: The conduction due to charges produced by pair generation is called intrinsic conduction.
Correct answer: Intrinsic- A. Antimony, phosphorous or Arsenic
- B. Carbon, oxygen and Nitrogen
- C. Arsenic and oxygen
- D. None of these
Explanation: We can gain an N-type semiconductor by adding impurities such as phosphorus or arsenic.
Correct answer: Antimony, phosphorous or Arsenic- A. Carbon, Oxygen and Nitrogen
- B. Boron, Indium or Gallium
- C. Arsenic and Oxygen
- D. None of these
Explanation: The P-type semiconductor is obtained by adding impurity materials such as boron, aluminum, or gallium.
Correct answer: Boron, Indium or Gallium- A. N-type
- B. P-type
- C. Q-type
- D. R-type
Explanation: The P-type semiconductor is obtained by adding trivalent impurity materials such as boron, aluminum, or gallium.
Correct answer: P-type- A. Majority carriers
- B. Minority carriers
- C. P-type
- D. N-type
Explanation: In a P-type semiconductor, holes are considered the majority carriers. Majority carriers are the dominant charge carriers in a…
Correct answer: Majority carriers