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