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