HomeElectronics Multiple choice question MCQ online testLogic gates MCQ Quiz Logic gates MCQ Quiz Leave a Comment / Electronics Multiple choice question MCQ online test Share this /48 0 votes, 0 avg 20 Created on June 20, 2023Digital electronics LOGIC GATES Most important and interesting Questions of digital Logic gates 1 / 48 Category: Logic gates 1. Which of the following gate is known as a coincidence detector? a. X-NOR gate b. AND gate c. NAND gate d. X-OR gate 2 / 48 Category: Logic gates 2. The output of a logic gate is 0 when all its inputs are at logic 0.The gate is either a. an OR or an X-NOR b. an AND or a NOR c. a NAND or an X-OR d. an OR or an X-OR 3 / 48 Category: Logic gates 3. The output of a NOR gate is high a. only when at least one input is high b. only when all the inputs are low c. (d) only when at least one input is low d. only when all the inputs are high 4 / 48 Category: Logic gates 4. An any or all gate is the other name of a. OR gate b. X-NOR gate c. X-OR gate d. AND gate 5 / 48 Category: Logic gates 5. The NOR gate can function as a NOT gate if a. one input is set to 0 b. inputs are left open c. one input is set to 1 d. all inputs are connected together 6 / 48 Category: Logic gates 6. The logic expression AB + Abar.Bbar can be implemented by giving the inputs A and B to a two input. a. X-NOR gate b. NAND gate c. NOR gate d. X-OR gate 7 / 48 Category: Logic gates 7. An OR gate can be imagined as a. switches connected in series b. transistors connected in parallel c. transistors connected in series d. switches connected in parallel 8 / 48 Category: Logic gates 8. A bubbled NAND gate is equivalent to a a. NAND gate b. X-OR gate c. NOR gate d. OR gate 9 / 48 Category: Logic gates 9. A gate is inhibited when its inhibit input is at logic 1. The gate is a. NONE OF THESE b. AND c. OR d. NAND 10 / 48 Category: Logic gates 10. An AND gate can be imagined as a. switches connected in parallel b. switches connected in series c. transistors connected in parallel d. transistors connected in series 11 / 48 Category: Logic gates 11. What logic function is produced by adding an inverter to each input and output of an AND gate ? a. X-OR b. NO c. NAND d. OR 12 / 48 Category: Logic gates 12. Which of the following gates is known as anticoincidence detector? a. X-NOR gate b. OR gate c. X-OR gate d. AND gate 13 / 48 Category: Logic gates 13. A gate is enabled when its enable input is at logic 1. The gate is a. NOR b. NAND c. OR d. NONE OF THESE 14 / 48 Category: Logic gates 14. The output of a logic gate is 1 when all its inputs are at logic 1. The gate is either a. an OR or an X-OR b. a NAND or a NOR c. an AND or a NOR d. an AND or an OR 15 / 48 Category: Logic gates 15. The output of a gate is HIGH if and only if all ts inputs are LOW. it is true for a. X-OR b. NAND c. NOR d. X-NOR 16 / 48 Category: Logic gates 16. How many NOR gates are.required to obtain AND operation? a. 1 b. 2 c. 4 d. 3 17 / 48 Category: Logic gates 17. What is the logic which controls a stair case light associated with two switches A and B locatedat the bottom and top of the stair case respectively? a. X-OR b. AND c. OR d. X-NOR 18 / 48 Category: Logic gates 18. The output of a NAND gate is low a. only when all the inputs are high b. only when all the inputs are low c. only when at least one input is high d. only when at least one input is low 19 / 48 Category: Logic gates 19. What logic function is produced by adding inverters to the inputs of an AND gate? a. OR b. NAND c. X-OR d. NOR 20 / 48 Category: Logic gates 20. The most suitable gate for comparing two bits is a. NAND b. AND c. OR d. X-OR 21 / 48 Category: Logic gates 21. Which of the following statements is true? a. NAND gates are not sufficient to realize any logic function b. OR and NOT gates are necessary and sufficient for realization of any logic function. c. NOR gates are sufficient to realize any logic function. d. AND and NOT gates are necessary and sufficient for realization of any logic function 22 / 48 Category: Uncategorized 22. A combinational circuit can be designed using only a. AND gates b. NAND gates c. OR gates d. OR and X-NOR gates 23 / 48 Category: Logic gates 23. NOT gates are to be added to the inputs of which gate to convert it to a NAND gate? a. OR b. AND c. NOT d. X-OR 24 / 48 Category: Logic gates 24. An X-OR gate gives a high output a. if the decimal value of digital word is even b. for odd decimal value c. if there are odd number of 1s d. if it has even number of 0s 25 / 48 Category: Logic gates 25. The output of a gate is LOW if and only if all its inputs are HIGH. it is true for a. X-NOR b. NAND c. AND d. NOR 26 / 48 Category: Logic gates 26. The number of rows in the truth table of a 4-input gate is a. 4 b. 16 c. 8 d. 12 27 / 48 Category: Logic gates 27. A gate is enabled when its enable input is at logic 0. The gate is a. NOR b. NONE OF THESE c. NAND d. AND 28 / 48 Category: Logic gates 28. What is the minimum number of NAND gates required to realize an X-OR gate? a. 6 b. 4 c. 3 d. 5 29 / 48 Category: Logic gates 29. What is the minimum number of two-input NAND gates used to perform the function of 2-input OR gate? a. 3 b. 1 c. 2 d. 4 30 / 48 Category: Logic gates 30. A gate is disabled when its disable input is at logic 0. The gate is a. OR b. NOR c. AND d. NONE OF THESE 31 / 48 Category: Logic gates 31. A bubbled OR gate is equivalent to a a. NOR gate b. AND gate c. NAND gate d. X-OR gate 32 / 48 Category: Logic gates 32. The NAND gate can function as a NOT gate if a. all inputs are connected together b. inputs are left open c. one input is set to 1 d. one input is set to 0 33 / 48 Category: Logic gates 33. An exclusive NOR gate is logically equivalent to a. inverter followed by an X-OR gate b. X-OR gate followed by an inverter c. NOT gate followed by a NOR gate d. complement of a NOR gate The 34 / 48 Category: Logic gates 34. What logic function is produced by adding an inverter to each input and output of an OR gate? a. AND b. NAND c. NOR d. X-OR 35 / 48 Category: Logic gates 35. The output of a gate is LOW when at least one of its inputs is HIGH. This is true for a. NOR b. OR c. AND d. NAND 36 / 48 Category: Logic gates 36. The output of a logic gate is 0 when all its inputs are at logic 1. The gate is either a. an OR or an X-OR b. a NOR or an X-NOR c. NAND or an AND d. a NAND or an X-OR 37 / 48 Category: Logic gates 37. A bubbled NAND gate is equivalent to a a. X-OR gate b. NAND gate c. NOR gate d. OR gate 38 / 48 Category: Logic gates 38. X-OR and X-NOR gates can have how many inputs? a. 2 b. 4 c. 1 d. any number 39 / 48 Category: Logic gates 39. A bubbled NOR gate is equivalent to a a. NOR gate b. X-OR gate c. AND gate d. NAND gate 40 / 48 Category: Logic gates 40. The output of a gate is HIGH when at least one of its inputs is LOW. It is true for a. AND b. NOR c. OR d. NAND 41 / 48 Category: Logic gates 41. An all or nothing gate is the other name of a. AND gate b. X-NOR gate c. X-OR gate d. OR gate 42 / 48 Category: Logic gates 42. What logic function is produced by adding inverters to the inputs of an OR gate? a. NOR b. AND c. X-NOR d. NAND 43 / 48 Category: Logic gates 43. A combinational circuit can be designed using only a. OR gates b. OR and X-NOR gates c. NOR gates d. AND gates 44 / 48 Category: Logic gates 44. The output of a logic gate is 1 when all its inputs are at logic 0. The gate is either a. an AND or an X-NOR b. an X-OR or an X-NOR c. an OR or a NAND d. a NAND or a NOR 45 / 48 Category: Logic gates 45. Which of the following gates cannot be used as an inverter? a. X-NOR b. NOR c. NAND d. AND 46 / 48 Category: Logic gates 46. Which of the following is known as a mod-2 adder? a. X-NOR gate b. NOR gate c. NAND gate d. X-OR gate 47 / 48 Category: Logic gates 47. NOT gates are to be added to the inputs of which gate to convert it to a NOR gate? a. NAND b. AND c. X-NOR d. OR 48 / 48 Category: Logic gates 48. What is the minimum number of NOR gates required to realize an X-OR gate? a. 5 b. 4 c. 6 d. 3 Your score isThe average score is 8% LinkedIn Facebook Twitter 0% Restart quiz Exit Anonymous feedback Thank you Send feedback Share this