Digital Electronics MCQ Questions and Answers Quiz

21. Add the binary number 1011 and 1101

  1. 11000
  2. 11001
  3. 11011
  4. 11111

22. Add the binary numbers 1010.1101 and 101.01

  1. 10000.0001
  2. 10000.0011
  3. 10010.0001
  4. 10010.0011

23. Which one of the following will give the sum of full-adder as output?

  1. Three input majority circuit
  2. Three bit parity checker
  3. Three bit parity comparator
  4. Three bit counter

24. Boolean logic is concerned with

  1. Binary number
  2. Decimal number
  3. Hexadecimal number
  4. Octal number

25. Perform the subtraction of 1011 and 0110

  1. 1100
  2. 100
  3. 101
  4. 111

26. Perform the subtraction of 1110 and 1001

  1. 1100
  2. 101
  3. 111
  4. 110

27. Which one of the following is equivalent to AND-OR realization?

  1. NAND-NOR realization
  2. NOR-NAND realization
  3. NOR-NOR realization
  4. NAND-NAND realization

28. Full adder can be changed into full subtractor circuit by adding one

  1. NOR Gate
  2. AND Gate
  3. OR Gate
  4. Inverter

29. The output of an AND gate is LOW ________.

  1. All the time
  2. When any input is LOW
  3. When any input is HIGH
  4. When all inputs are HIGH

30. The output of a NOT gate is HIGH when ________.

  1. Input is LOW
  2. Input is HIGH
  3. Input changes from LOW to HIGH
  4. Voltage is removed from the gate
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