Electronics MCQ Questions and Answers

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Q11
Choose the only false statement from the following.
  • A in conductors the valence and conduction bands may overlap.
  • B Substances with energy gap of the order of 10 eV are insulators.
  • C The resistivity of a semiconductor increases with increase in temperature.
  • D The conductivity of a semiconductor increases with increase in temperature.
Answer: Option C
Q12
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?
  • A (Eg)C> (Eg)Si
  • B (Eg)C< (Eg)Si
  • C (Eg)C=(Eg)Si
  • D (Eg)C< (Eg)Ge
Answer: Option A
Q13
Application of a forward bias to a p-n junction
  • A widens the depletion zone.
  • B increases the potential difference across the depletion zone.
  • C increases the number of donors on the n side.
  • D increases the electric field in the depletion zone.
Answer: Option C
Q14
Zener diode is used for?
  • A Amplification
  • B Rectification
  • C Stabilisation
  • D Producing oscillations in an oscillator
Answer: Option C
Q15
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
  • A NAND
  • B OR
  • C AND
  • D XOR
Answer: Option B
Q16
In which of the following base systems is 123 not a valid number?
  • A Base 10
  • B Base 16
  • C Base8
  • D Base 3
Answer: Option D
Q17
Storage of 1 KB means the following number of bytes
  • A 1000
  • B 964
  • C 1024
  • D 1064.
Answer: Option D
Q18
What is the octal equivalent of the binary number: 10111101
  • A 675
  • B 275
  • C 572
  • D 573.
Answer: Option B
Q19
Pick out the CORRECT statement:
  • A In a positional number system, each symbol represents the same value irrespective of its position
  • B The highest symbol in a position number system as a value equal to the number of symbols in the system
  • C It is not always possible to find the exact binary
  • D Each hexadecimal digit can be represented as a sequence of three binary symbols.
Answer: Option C
Q20
The binary code of (21.125)10 is
  • A 10101.001
  • B 10100.001
  • C 10101.010
  • D 10100.111.
Answer: Option A

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