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Logic Gates MCQs

Practice Logic Gates MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 4
Digital ElectronicsLogic Gates

A two-input XOR gate produces HIGH output when?

  • ABoth inputs are LOW
  • BBoth inputs are HIGH
  • CThe two inputs are different
  • DAt least one input is HIGH including both HIGH
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Correct Answer: C. The two inputs are different
Explanation: For a two-input XOR gate, the output is HIGH when exactly one input is HIGH, meaning the inputs differ.
Reference: XOR truth table
Question 5
Digital ElectronicsLogic Gates

A NOT gate is also called a?

  • ABuffer
  • BInverter
  • CComparator
  • DEncoder
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Correct Answer: B. Inverter
Explanation: A NOT gate complements its input and is therefore called an inverter.
Reference: Basic logic gates
Question 6
Digital ElectronicsLogic Gates

Which pair consists entirely of universal gates?

  • AAND and OR
  • BXOR and XNOR
  • CNAND and NOR
  • DNOT and AND
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Correct Answer: C. NAND and NOR
Explanation: Either NAND gates alone or NOR gates alone can be used to implement any Boolean function.
Reference: Universal logic gates