# Logic gates MCQ Quiz

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Digital electronics

LOGIC GATES

Most important and interesting Questions of digital Logic gates

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1. A bubbled NAND gate is equivalent to a

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2. An X-OR gate gives a high output

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3. An all or nothing gate is the other name of

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4. What logic function is produced by adding an inverter to each input and output of an OR gate?

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5. A bubbled NAND gate is equivalent to a

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6. Which of the following is known as a mod-2 adder?

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7. A combinational circuit can be designed using only

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8. Which of the following gate is known as a coincidence detector?

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9. An AND gate can be imagined as

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10. NOT gates are to be added to the inputs of which gate to convert it to a NAND gate?

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11. A bubbled NOR gate is equivalent to a

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12. The output of a logic gate is 0 when all its inputs are at logic 0.The gate is either

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13. A gate is disabled when its disable input is at logic 0. The gate is

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14. What logic function is produced by adding inverters to the inputs of an OR gate?

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15. What logic function is produced by adding inverters to the inputs of an AND gate?

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16. X-OR and X-NOR gates can have how many inputs?

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17. A gate is inhibited when its inhibit input is at logic 1. The gate is

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18. The output of a NAND gate is low

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19. The output of a logic gate is 1 when all its inputs are at logic 1. The gate is either

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20. The output of a gate is HIGH when at least one of its inputs is LOW. It is true for

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21. An any or all gate is the other name of

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22. A gate is enabled when its enable input is at logic 0. The gate is

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23. The NAND gate can function as a NOT gate if

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Category: Logic gates

24. What logic function is produced by adding an inverter to each input and output of an AND gate ?

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25. The NOR gate can function as a NOT gate if

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26. What is the minimum number of NOR gates required to realize an X-OR gate?

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27. An exclusive NOR gate is logically equivalent to

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28. What is the minimum number of two-input NAND gates used to perform the function of 2-input OR gate?

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29. The output of a logic gate is 0 when all its inputs are at logic 1. The gate is either

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30. The output of a logic gate is 1 when all its inputs are at logic 0. The gate is either

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Category: Logic gates

31. Which of the following gates is known as anticoincidence detector?

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32. The output of a gate is HIGH if and only if all ts inputs are LOW. it is true for

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33. The most suitable gate for comparing two bits is

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34. What is the logic which controls a stair case light associated with two switches A and B located
at the bottom and top of the stair case respectively?

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35. A combinational circuit can be designed using only

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36. Which of the following statements is true?

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37. The output of a NOR gate is high

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38. How many NOR gates are.required to obtain AND operation?

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39. The logic expression AB + Abar.Bbar can be implemented by giving the inputs A and B to a two input.

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40. The number of rows in the truth table of a 4-input gate is

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41. What is the minimum number of NAND gates required to realize an X-OR gate?

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42. The output of a gate is LOW if and only if all its inputs are HIGH. it is true for

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Category: Logic gates

43. Which of the following gates cannot be used as an inverter?

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44. An OR gate can be imagined as

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Category: Logic gates

45. A bubbled OR gate is equivalent to a

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46. NOT gates are to be added to the inputs of which gate to convert it to a NOR gate?

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Category: Logic gates

47. The output of a gate is LOW when at least one of its inputs is HIGH. This is true for

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48. A gate is enabled when its enable input is at logic 1. The gate is