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 39 Created on June 20, 2023Digital electronics LOGIC GATES Most important and interesting Questions of digital Logic gates 1 / 48 Category: Logic gates An all or nothing gate is the other name of a. X-OR gate b. X-NOR gate c. AND gate d. OR gate 2 / 48 Category: Logic gates A gate is enabled when its enable input is at logic 1. The gate is a. OR b. NOR c. NONE OF THESE d. NAND 3 / 48 Category: Logic gates NOT gates are to be added to the inputs of which gate to convert it to a NOR gate? a. OR b. AND c. NAND d. X-NOR 4 / 48 Category: Logic gates 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. X-NOR c. X-OR d. AND 5 / 48 Category: Logic gates An X-OR gate gives a high output a. for odd decimal value b. if the decimal value of digital word is even c. if there are odd number of 1s d. if it has even number of 0s 6 / 48 Category: Logic gates A gate is inhibited when its inhibit input is at logic 1. The gate is a. NAND b. AND c. OR d. NONE OF THESE 7 / 48 Category: Logic gates The most suitable gate for comparing two bits is a. OR b. AND c. X-OR d. NAND 8 / 48 Category: Logic gates 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 What is the minimum number of NAND gates required to realize an X-OR gate? a. 3 b. 4 c. 6 d. 5 10 / 48 Category: Logic gates 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. NOT d. AND 11 / 48 Category: Logic gates An OR gate can be imagined as a. transistors connected in series b. transistors connected in parallel c. switches connected in series d. switches connected in parallel 12 / 48 Category: Logic gates A gate is disabled when its disable input is at logic 0. The gate is a. AND b. NONE OF THESE c. NOR d. OR 13 / 48 Category: Logic gates X-OR and X-NOR gates can have how many inputs? a. 4 b. 2 c. 1 d. any number 14 / 48 Category: Logic gates What is the minimum number of NOR gates required to realize an X-OR gate? a. 3 b. 5 c. 6 d. 4 15 / 48 Category: Uncategorized A combinational circuit can be designed using only a. NAND gates b. OR and X-NOR gates c. OR gates d. AND gates 16 / 48 Category: Logic gates Which of the following gates is known as anticoincidence detector? a. X-OR gate b. X-NOR gate c. AND gate d. OR gate 17 / 48 Category: Logic gates The output of a gate is HIGH when at least one of its inputs is LOW. It is true for a. OR b. NAND c. NOR d. AND 18 / 48 Category: Logic gates The number of rows in the truth table of a 4-input gate is a. 12 b. 8 c. 4 d. 16 19 / 48 Category: Logic gates A gate is enabled when its enable input is at logic 0. The gate is a. NAND b. NOR c. AND d. NONE OF THESE 20 / 48 Category: Logic gates A bubbled NAND gate is equivalent to a a. NOR gate b. X-OR gate c. OR gate d. NAND gate 21 / 48 Category: Logic gates Which of the following gate is known as a coincidence detector? a. X-OR gate b. NAND gate c. AND gate d. X-NOR gate 22 / 48 Category: Logic gates A bubbled NOR gate is equivalent to a a. NAND gate b. NOR gate c. AND gate d. X-OR gate 23 / 48 Category: Logic gates A bubbled NAND gate is equivalent to a a. NAND gate b. X-OR gate c. NOR gate d. OR gate 24 / 48 Category: Logic gates 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. NAND or an AND c. a NAND or an X-OR d. an OR or an X-OR 25 / 48 Category: Logic gates 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 What is the minimum number of two-input NAND gates used to perform the function of 2-input OR gate? a. 1 b. 4 c. 3 d. 2 27 / 48 Category: Logic gates The logic expression AB + Abar.Bbar can be implemented by giving the inputs A and B to a two input. a. NOR gate b. NAND gate c. X-OR gate d. X-NOR gate 28 / 48 Category: Logic gates The output of a gate is LOW when at least one of its inputs is HIGH. This is true for a. NOR b. OR c. NAND d. AND 29 / 48 Category: Logic gates A bubbled OR gate is equivalent to a a. NAND gate b. NOR gate c. X-OR gate d. AND gate 30 / 48 Category: Logic gates Which of the following gates cannot be used as an inverter? a. NAND b. X-NOR c. NOR d. AND 31 / 48 Category: Logic gates The output of a NOR gate is high a. only when all the inputs are low b. only when at least one input is high c. (d) only when at least one input is low d. only when all the inputs are high 32 / 48 Category: Logic gates Which of the following statements is true? a. NOR gates are sufficient to realize 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. AND and NOT gates are necessary and sufficient for realization of any logic function 33 / 48 Category: Logic gates 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 34 / 48 Category: Logic gates How many NOR gates are.required to obtain AND operation? a. 1 b. 3 c. 4 d. 2 35 / 48 Category: Logic gates The NAND gate can function as a NOT gate if a. one input is set to 1 b. one input is set to 0 c. inputs are left open d. all inputs are connected together 36 / 48 Category: Logic gates 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 37 / 48 Category: Logic gates The NOR gate can function as a NOT gate if a. all inputs are connected together b. one input is set to 0 c. one input is set to 1 d. inputs are left open 38 / 48 Category: Logic gates 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. a NAND or a NOR c. an OR or a NAND d. an X-OR or an X-NOR 39 / 48 Category: Logic gates Which of the following is known as a mod-2 adder? a. X-NOR gate b. NOR gate c. NAND gate d. X-OR gate 40 / 48 Category: Logic gates What logic function is produced by adding inverters to the inputs of an AND gate? a. X-OR b. NOR c. OR d. NAND 41 / 48 Category: Logic gates An any or all gate is the other name of a. X-OR gate b. X-NOR gate c. OR gate d. AND gate 42 / 48 Category: Logic gates An AND 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 43 / 48 Category: Logic gates What logic function is produced by adding inverters to the inputs of an OR gate? a. AND b. NOR c. NAND d. X-NOR 44 / 48 Category: Logic gates The output of a NAND gate is low a. only when at least one input is high b. only when all the inputs are low c. only when at least one input is low d. only when all the inputs are high 45 / 48 Category: Logic gates 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-OR c. an OR or an X-NOR d. an AND or a NOR 46 / 48 Category: Logic gates What logic function is produced by adding an inverter to each input and output of an OR gate? a. AND b. NAND c. NOR d. X-OR 47 / 48 Category: Logic gates 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 48 / 48 Category: Logic gates A combinational circuit can be designed using only a. OR gates b. OR and X-NOR gates c. AND gates d. 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