Logic Gates(General Knowledge > General Science ) Questions and Answers

Question 1. How many different combinations of 1 and 0 are possible with 1 bit?
  1.    1
  2.    2
  3.    3
  4.    4
Explanation:-
Answer: Option B. -> 2
Question 2. A logic circuit has n inputs
  1.    2×n
  2.    2n
  3.    n÷2
  4.    None of these
Explanation:-
Answer: Option B. -> 2n
Question 3. A NAND gate's outputs are the ______ of those of an AND gate
  1.    Twin
  2.    Sum
  3.    Opposite
  4.    Absolute value
Explanation:-
Answer: Option C. -> Opposite
Question 4. What is a truth table?
  1.    A.A table that denotes the different outputs of the logic gates or circuit with respect to different inputs.
  2.    B.A table that represents how logic gates are combined to form a logic circuit.
  3.    C.A table that shows the input combinations that result in a binary output 1 in a logic gate.
  4.    none of the above
Explanation:-
Answer: Option A. -> A.A table that denotes the different outputs of the logic gates or circuit with respect to different inputs.
Question 5. Which logic gates output a 1 if their inputs are 0 and 1?
  1.    Only OR gates
  2.    NAND and OR gates
  3.    NOR and AND gates
  4.    NAND, OR, and XOR gates
Explanation:-
Answer: Option D. -> NAND, OR, and XOR gates
Question 6. What is the output of an AND gate if the inputs are 1 and 0?
  1.    ON
  2.    2
  3.    1
  4.    0
Explanation:-
Answer: Option D. -> 0
Question 7. What is a logic circuit?
  1.    A combination of logic gates that performs a specific function.
  2.    A combination of logic gates that understands both binary and decimal number systems.
  3.    A combination of logic gates that understands decimal number system.
  4.    None of these
Explanation:-
Answer: Option A. -> A combination of logic gates that performs a specific function.
Question 8. What is the output of a NOT gate if the inputs is 0?
  1.    1
  2.    0
  3.    OFF
  4.    2
Explanation:-
Answer: Option A. -> 1
Question 9. Which of the following is FALSE about a NOT gate?
  1.    The output of NOT is complementary to the input
  2.    When the input to NOT gate is 0, the output is 1.
  3.    A NOT gate has two input signals and an output signal.
  4.    None of the above
Explanation:-
Answer: Option C. -> A NOT gate has two input signals and an output signal.
Question 10. How do you make a NOR gate out of an NAND gate using inverters (NOT gates)?
  1.    Invert the output from the NAND gate
  2.    Invert both the inputs to the NAND gate
  3.    Invert one of the inputs to the NAND gate
  4.    Invert both the inputs and output of the NAND gate
Explanation:-
Answer: Option D. -> Invert both the inputs and output of the NAND gate
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