Electronics MCQ Questions and Answers

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Electronics MCQ Questions with Answers are a key part of preparation for competitive exams like GATE, ISRO, DRDO, and ECIL. These questions assess understanding of fundamental topics such as semiconductors, amplifiers, transistors, and digital circuits. Each question includes clear explanations, helping students grasp key concepts in less time. Practicing electronics MCQs not only boosts technical knowledge but also enhances problem-solving skills needed in both interviews and online test rounds.

Electronics MCQ

Showing 10 of 40 questions

11. Choose the only false statement from the following.

  • in conductors the valence and conduction bands may overlap.
  • Substances with energy gap of the order of 10 eV are insulators.
  • The resistivity of a semiconductor increases with increase in temperature.
  • The conductivity of a semiconductor increases with increase in temperature.
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12. Carbon, Silicon and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by (Eg)C, (Eg)Si and (Eg)Ge respectively. Which one of the following relationship is true in their case?

  • (Eg)C> (Eg)Si
  • (Eg)C< (Eg)Si
  • (Eg)C=(Eg)Si
  • (Eg)C< (Eg)Ge
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13. Application of a forward bias to a p-n junction

  • widens the depletion zone.
  • increases the potential difference across the depletion zone.
  • increases the number of donors on the n side.
  • increases the electric field in the depletion zone.
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14. Zener diode is used for?

  • Amplification
  • Rectification
  • Stabilisation
  • Producing oscillations in an oscillator
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15. The following truth table corresponds to which Logic gate A &nbsp;&nbsp;&nbsp; B &nbsp;&nbsp;&nbsp; Output 0 &nbsp;&nbsp;&nbsp; 0 &nbsp;&nbsp;&nbsp; 0 0 &nbsp;&nbsp;&nbsp; 1 &nbsp;&nbsp;&nbsp; 1 1 &nbsp;&nbsp;&nbsp; 0 &nbsp;&nbsp;&nbsp; 1 1 &nbsp;&nbsp;&nbsp; 1 &nbsp;&nbsp;&nbsp; 1

  • NAND
  • OR
  • AND
  • XOR
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16. In which of the following base systems is 123 not a valid number?

  • Base 10
  • Base 16
  • Base8
  • Base 3
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17. Storage of 1 KB means the following number of bytes

  • 1000
  • 964
  • 1024
  • 1064.
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18. What is the octal equivalent of the binary number: 10111101

  • 675
  • 275
  • 572
  • 573.
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19. Pick out the CORRECT statement:

  • In a positional number system, each symbol represents the same value irrespective of its position
  • The highest symbol in a position number system as a value equal to the number of symbols in the system
  • It is not always possible to find the exact binary
  • Each hexadecimal digit can be represented as a sequence of three binary symbols.
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20. The binary code of (21.125)10 is

  • 10101.001
  • 10100.001
  • 10101.010
  • 10100.111.
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