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