Quiz  /  Logic Gates Class 9 MCQ Questions With Answers

  • 1. 
    Logic circuit has 4 inputs. How many output combinations are possible?

  • 8
  • 16
  • 32
  • 4

  • 2. 
    When is the output for OR gate TRUE?

  • A.When both inputs are TRUE.
  • B.When at least one of the inputs is TRUE.
  • C.When both inputs are FALSE
  • D.When at least one of the inputs is FALSE.

  • 3. 
    "The burglar alarm will go off if either the door or the window or both are opened". This is an example of which type of Logic?

  • AND
  • OR
  • NOT
  • NOR

  • 4. 
    The And Gate is represented algebraically by

  • *
  • +
  • -
  • %

  • 5. 
    How many different combinations of 1 and 0 are possible with 2 bits?

  • 2
  • 4
  • 6
  • 8

  • 6. 
    8.An AND gate has two inputs A and B. What is the Boolean expression for this logic gate?

  • A.A^B
  • B.A˅B
  • C.¬A^B

  • 7. 
    Binary 10101010 = in decimal?

  • 85
  • 170
  • 180
  • 75

  • 8. 
    5.Which of the following is FALSE about a NOT gate?

  • A.The output of NOT is complementary to the input
  • B.When the input to NOT gate is 0, the output is 1.
  • C.A NOT gate has two input signals and an output signal.
  • D.None of the above

  • 9. 
    2.What is a truth table?

  • A.A table that denotes the different outputs of the logic gates or circuit with respect to different inputs.
  • B.A table that represents how logic gates are combined to form a logic circuit.
  • C.A table that shows the input combinations that result in a binary output 1 in a logic gate.

  • 10. 
    Logc Circuits are formed of

  • AND Gates
  • OR Gates
  • NOT Gates
  • All of the above

  • 11. 
    What type of logic gate is this table showing?

  • AND
  • OR
  • NOT

  • 12. 
    A NOT gate has…

  • Two inputs and one output
  • One input and one output
  • One input and two outputs
  • Two inputs and two outputs

  • 13. 
    Why do we make intermediate columns when constructing truth tables?

  • Because it gets us more marks
  • Because it's impossible to get the answer without them
  • Because it makes working out the solution easier
  • There is no reason to make them

  • 14. 
    The OR Gate has Algebraic presentation of

  • plus sign (-)
  • Plus (+)
  • None of these

  • 15. 
    4.A logic circuit has n inputs. How many output combinations are possible?

  • A.2×n
  • B.2n
  • C.n÷2

  • 16. 
    How many different combinations of 1 and 0 are possible with 1 bit?

  • 1
  • 2
  • 3
  • 4

  • 17. 
    Electronic switch built in 1947

  • transistor
  • semiconductor
  • diode
  • vacuum tube

  • 18. 
    What logic gate is this?

  • AND
  • OR
  • NOT
  • TO

  • 19. 
    (C AND D) OR (NOT(A OR B)) = Q, If A=1, B=1, C=0 and D=1, what does Q equal?

  • 0
  • 1

  • 20. 
    How do we get all the inputs for a truth table with 3 inputs?

  • Guess all the combinations of 1s and 0s
  • Count up in binary from 000
  • Count up in binary from 111
  • Count up in binary from 1

  • 21. 
    What is a logic circuit?

  • A combination of logic gates that performs a specific function.
  • A combination of logic gates that understands both binary and decimal number systems.
  • A combination of logic gates that understands decimal number system.

  • 22. 
    1.Which of the following statement is FALSE about logic gates?

  • A.Logic gates are the building blocks of electronic circuits.
  • B.It used in computer components like memory.
  • C.Combination of logic gates is called a logic circuit.
  • D.Logic gates understand the binary language.
  • E.None of the above.

  • 23. 
    An OR gate has

  • Two inputs and one output
  • One input and one output
  • One input and two outputs
  • Two inputs and two outputs

  • 24. 
    The only gate that has 1 input and 1 output is

  • AND
  • OR
  • XOR
  • NOT
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