HomeElectronics Multiple choice question MCQ online testLogic gates MCQ Quiz Logic gates MCQ Quiz Leave a Comment / Electronics Multiple choice question MCQ online test Spread the love /48 0 votes, 0 avg 37 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. X-OR b. AND c. NOR d. NAND 2 / 48 Category: Logic gates 2. 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 low c. only when at least one input is high d. only when all the inputs are high 3 / 48 Category: Uncategorized 3. A combinational circuit can be designed using only a. NAND gates b. OR and X-NOR gates c. OR gates d. AND gates 4 / 48 Category: Logic gates 4. 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. a NAND or a NOR d. an AND or an OR 5 / 48 Category: Logic gates 5. NOT gates are to be added to the inputs of which gate to convert it to a NOR gate? a. AND b. NAND c. OR d. X-NOR 6 / 48 Category: Logic gates 6. Which of the following gate is known as a coincidence detector? a. X-NOR gate b. X-OR gate c. AND gate d. NAND gate 7 / 48 Category: Logic gates 7. What is the logic which controls a stair case light associated with two switches A and B located at the bottom and top of the stair case respectively? a. OR b. AND c. X-NOR d. X-OR 8 / 48 Category: Logic gates 8. 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 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. NOR b. NAND c. OR d. AND 10 / 48 Category: Logic gates 10. A gate is disabled when its disable input is at logic 0. The gate is a. NOR b. OR c. NONE OF THESE d. AND 11 / 48 Category: Logic gates 11. Which of the following gates cannot be used as an inverter? a. X-NOR b. NAND c. AND d. NOR 12 / 48 Category: Logic gates 12. X-OR and X-NOR gates can have how many inputs? a. 2 b. 4 c. 1 d. any number 13 / 48 Category: Logic gates 13. 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. 1 d. 3 14 / 48 Category: Logic gates 14. What is the minimum number of NAND gates required to realize an X-OR gate? a. 6 b. 3 c. 4 d. 5 15 / 48 Category: Logic gates 15. The NOR gate can function as a NOT gate if a. one input is set to 0 b. one input is set to 1 c. all inputs are connected together d. inputs are left open 16 / 48 Category: Logic gates 16. An OR gate can be imagined as a. switches connected in series b. switches connected in parallel c. transistors connected in parallel d. transistors connected in series 17 / 48 Category: Logic gates 17. What logic function is produced by adding inverters to the inputs of an AND gate? a. NAND b. NOR c. OR d. X-OR 18 / 48 Category: Logic gates 18. 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 19 / 48 Category: Logic gates 19. 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 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. NOR b. NAND c. X-OR d. X-NOR 21 / 48 Category: Logic gates 21. The logic expression AB + Abar.Bbar can be implemented by giving the inputs A and B to a two input. a. NAND gate b. X-OR gate c. X-NOR gate d. NOR gate 22 / 48 Category: Logic gates 22. 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 at least one input is high d. only when all the inputs are low 23 / 48 Category: Logic gates 23. What logic function is produced by adding inverters to the inputs of an OR gate? a. X-NOR b. NAND c. NOR d. AND 24 / 48 Category: Logic gates 24. The output of a gate is LOW when at least one of its inputs is HIGH. This is true for a. OR b. AND c. NOR d. NAND 25 / 48 Category: Logic gates 25. How many NOR gates are.required to obtain AND operation? a. 4 b. 2 c. 1 d. 3 26 / 48 Category: Logic gates 26. 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 27 / 48 Category: Logic gates 27. Which of the following statements is true? a. NAND gates are not sufficient to realize any logic function b. AND and NOT gates are necessary and sufficient for realization of 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. 28 / 48 Category: Logic gates 28. A bubbled NAND gate is equivalent to a a. OR gate b. NAND gate c. NOR gate d. X-OR gate 29 / 48 Category: Logic gates 29. The output of a logic gate is 1 when all its inputs are at logic 0. The gate is either a. an X-OR or an X-NOR b. a NAND or a NOR c. an OR or a NAND d. an AND or an X-NOR 30 / 48 Category: Logic gates 30. 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. NAND or an AND d. a NOR or an X-NOR 31 / 48 Category: Logic gates 31. The number of rows in the truth table of a 4-input gate is a. 4 b. 8 c. 12 d. 16 32 / 48 Category: Logic gates 32. What logic function is produced by adding an inverter to each input and output of an AND gate ? a. OR b. NO c. NAND d. X-OR 33 / 48 Category: Logic gates 33. An exclusive NOR gate is logically equivalent to a. complement of a NOR gate The b. inverter followed by an X-OR gate c. NOT gate followed by a NOR gate d. X-OR gate followed by an inverter 34 / 48 Category: Logic gates 34. Which of the following gates is known as anticoincidence detector? a. X-NOR gate b. X-OR gate c. OR gate d. AND gate 35 / 48 Category: Logic gates 35. A bubbled NOR gate is equivalent to a a. NOR gate b. NAND gate c. AND gate d. X-OR gate 36 / 48 Category: Logic gates 36. 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 37 / 48 Category: Logic gates 37. What is the minimum number of NOR gates required to realize an X-OR gate? a. 3 b. 6 c. 4 d. 5 38 / 48 Category: Logic gates 38. A bubbled NAND gate is equivalent to a a. X-OR gate b. NOR gate c. OR gate d. NAND gate 39 / 48 Category: Logic gates 39. An any or all gate is the other name of a. OR gate b. X-OR gate c. X-NOR gate d. AND gate 40 / 48 Category: Logic gates 40. An all or nothing gate is the other name of a. X-OR gate b. OR gate c. X-NOR gate d. AND gate 41 / 48 Category: Logic gates 41. The most suitable gate for comparing two bits is a. NAND b. X-OR c. AND d. OR 42 / 48 Category: Logic gates 42. 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 43 / 48 Category: Logic gates 43. Which of the following is known as a mod-2 adder? a. X-OR gate b. X-NOR gate c. NOR gate d. NAND gate 44 / 48 Category: Logic gates 44. A combinational circuit can be designed using only a. NOR gates b. OR gates c. AND gates d. OR and X-NOR gates 45 / 48 Category: Logic gates 45. An AND gate can be imagined as a. transistors connected in parallel b. transistors connected in series c. switches connected in series d. switches connected in parallel 46 / 48 Category: Logic gates 46. 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 47 / 48 Category: Logic gates 47. 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 48 / 48 Category: Logic gates 48. A bubbled OR gate is equivalent to a a. NAND gate b. X-OR gate c. NOR gate d. AND gate Your score isThe average score is 9% LinkedIn Facebook 0% Restart quiz Exit Anonymous feedback Thank you Send feedback Spread the love
