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