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