Logic gates MCQ Quiz Leave a Comment / Electronics Multiple choice question MCQ online test Share this /48 0 votes, 0 avg 14 Created on June 20, 2023Digital electronics LOGIC GATES Most important and interesting Questions of digital Logic gates 1 / 48 Category: Logic gates 1. A bubbled NAND gate is equivalent to a a. OR gate b. X-OR gate c. NAND gate d. NOR gate 2 / 48 Category: Logic gates 2. The output of a NOR gate is high a. only when all the inputs are high b. only when at least one input is high c. only when all the inputs are low d. (d) only when at least one input is low 3 / 48 Category: Logic gates 3. A combinational circuit can be designed using only a. AND gates b. OR gates c. NOR gates d. OR and X-NOR gates 4 / 48 Category: Logic gates 4. Which of the following gates cannot be used as an inverter? a. NAND b. NOR c. X-NOR d. AND 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. The output of a gate is LOW if and only if all its inputs are HIGH. it is true for a. NOR b. AND c. X-NOR d. NAND 7 / 48 Category: Logic gates 7. How many NOR gates are.required to obtain AND operation? a. 1 b. 3 c. 4 d. 2 8 / 48 Category: Logic gates 8. 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 9 / 48 Category: Logic gates 9. What is the minimum number of NOR gates required to realize an X-OR gate? a. 3 b. 4 c. 6 d. 5 10 / 48 Category: Logic gates 10. The most suitable gate for comparing two bits is a. OR b. AND c. NAND d. X-OR 11 / 48 Category: Logic gates 11. 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. X-OR gate c. NOR gate d. NAND gate 12 / 48 Category: Logic gates 12. What logic function is produced by adding inverters to the inputs of an AND gate? a. OR b. NOR c. NAND d. X-OR 13 / 48 Category: Logic gates 13. An X-OR gate gives a high output a. for odd decimal value b. if it has even number of 0s c. if there are odd number of 1s d. if the decimal value of digital word is even 14 / 48 Category: Logic gates 14. A bubbled NAND gate is equivalent to a a. NOR gate b. NAND gate c. X-OR gate d. OR gate 15 / 48 Category: Logic gates 15. NOT gates are to be added to the inputs of which gate to convert it to a NAND gate? a. NOT b. X-OR c. AND d. OR 16 / 48 Category: Logic gates 16. A gate is enabled when its enable input is at logic 1. The gate is a. OR b. NONE OF THESE c. NOR d. NAND 17 / 48 Category: Logic gates 17. What logic function is produced by adding inverters to the inputs of an OR gate? a. NAND b. AND c. NOR d. X-NOR 18 / 48 Category: Logic gates 18. The output of a NAND gate is low a. only when at least one input is high b. only when at least one input is low c. only when all the inputs are high d. only when all the inputs are low 19 / 48 Category: Logic gates 19. An exclusive NOR gate is logically equivalent to a. inverter followed by an X-OR gate b. complement of a NOR gate The c. NOT gate followed by a NOR gate d. X-OR gate followed by an inverter 20 / 48 Category: Logic gates 20. A gate is disabled when its disable input is at logic 0. The gate is a. NONE OF THESE b. OR c. NOR d. AND 21 / 48 Category: Uncategorized 21. A combinational circuit can be designed using only a. OR and X-NOR gates b. AND gates c. OR gates d. NAND gates 22 / 48 Category: Logic gates 22. 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-OR c. OR d. X-NOR 23 / 48 Category: Logic gates 23. Which of the following statements is true? a. AND and NOT gates are necessary and sufficient for realization of any logic function b. NAND gates are not sufficient to realize any logic function c. OR and NOT gates are necessary and sufficient for realization of any logic function. d. NOR gates are sufficient to realize any logic function. 24 / 48 Category: Logic gates 24. An OR gate can be imagined as a. switches connected in parallel b. switches connected in series c. transistors connected in series d. transistors connected in parallel 25 / 48 Category: Logic gates 25. The number of rows in the truth table of a 4-input gate is a. 12 b. 16 c. 8 d. 4 26 / 48 Category: Logic gates 26. The output of a gate is HIGH if and only if all ts inputs are LOW. it is true for a. X-NOR b. NAND c. NOR d. X-OR 27 / 48 Category: Logic gates 27. Which of the following gates is known as anticoincidence detector? a. OR gate b. AND gate c. X-OR gate d. X-NOR gate 28 / 48 Category: Logic gates 28. 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 29 / 48 Category: Logic gates 29. X-OR and X-NOR gates can have how many inputs? a. 2 b. 1 c. any number d. 4 30 / 48 Category: Logic gates 30. What is the minimum number of NAND gates required to realize an X-OR gate? a. 5 b. 6 c. 4 d. 3 31 / 48 Category: Logic gates 31. An AND gate can be imagined as a. switches connected in series b. transistors connected in series c. switches connected in parallel d. transistors connected in parallel 32 / 48 Category: Logic gates 32. An all or nothing gate is the other name of a. X-NOR gate b. X-OR gate c. OR gate d. AND gate 33 / 48 Category: Logic gates 33. An any or all gate is the other name of a. OR gate b. AND gate c. X-OR gate d. X-NOR gate 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. NOR b. AND c. X-OR d. NAND 35 / 48 Category: Logic gates 35. The NAND gate can function as a NOT gate if a. all inputs are connected together b. one input is set to 1 c. one input is set to 0 d. inputs are left open 36 / 48 Category: Logic gates 36. 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. a NAND or a NOR d. an OR or an X-OR 37 / 48 Category: Logic gates 37. Which of the following gate is known as a coincidence detector? a. AND gate b. X-OR gate c. NAND gate d. X-NOR gate 38 / 48 Category: Logic gates 38. The output of a gate is HIGH when at least one of its inputs is LOW. It is true for a. NAND b. AND c. OR d. NOR 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. X-NOR b. AND c. OR d. NAND 40 / 48 Category: Logic gates 40. A bubbled OR gate is equivalent to a a. X-OR gate b. NOR gate c. AND gate d. NAND gate 41 / 48 Category: Logic gates 41. A bubbled NOR gate is equivalent to a a. X-OR gate b. NAND gate c. NOR gate d. AND gate 42 / 48 Category: Logic gates 42. Which of the following is known as a mod-2 adder? a. NAND gate b. X-OR gate c. X-NOR gate d. NOR gate 43 / 48 Category: Logic gates 43. 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 44 / 48 Category: Logic gates 44. 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 45 / 48 Category: Logic gates 45. The output of a logic gate is 0 when all its inputs are at logic 0.The gate is either a. an OR or an X-NOR b. an OR or an X-OR c. an AND or a NOR d. a NAND or an X-OR 46 / 48 Category: Logic gates 46. 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. NAND or an AND c. a NAND or an X-OR d. a NOR or an X-NOR 47 / 48 Category: Logic gates 47. 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. 2 d. 4 48 / 48 Category: Logic gates 48. 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 Your score is The average score is 11% LinkedIn Facebook Twitter 0% Restart quiz Exit Anonymous feedback Thank you Send feedback Share this