300+ TOP MCQs on Logic Gates and Answers

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MCQs on Logic Gates :

1. An inverter gates can be developed using
(A) Two diodes
(B) Resistance and capacitance
(C) Transistor
(D) Inductance and capacitance

Answer

Answer: (C) Transistor

2. The output of the two-input OR gate is high
(A) Only if both inputs are high
(B) Only if both inputs are low
(C) Only if one input is high and the other is low
(D) If at least one of the inputs is low

Answer

Answer: (D) If at least one of the inputs is low

3. The output of a two-input AND gate is high
(A) Only if both the inputs are high
(B) Only if both the inputs are low
(C) Only if one input is high and the other is low
(D) If at least one input is low

Answer

Answer: (A) Only if both the inputs are high

4. NAND gate means
(A) Inversion followed by AND gates
(B) AND gates followed by an inverter
(C) AND gate followed by OR gate
(D) None of these

Answer

Answer: (B) AND gates followed by an inverter

5. The output of the two-input NAND gate is high
(A) Only if both the inputs are high
(B) Only if both the inputs are low
(C) Only if one input is high and the other is low
(D) If at least one input is low

Answer

Answer: (D) If at least one input is low

6. A NOT gate means
(A) Inversion followed by an OR gate
(B) OR gate followed by an inverter
(C) NOT gate followed by an OR gate
(D) NAND gate followed by an OR gate

Answer

Answer: (B) OR gate followed by an inverter

7. The output of two-input NOR gate is high
(A) Only if both the inputs are high
(B) Only if both the inputs are low
(C) Only if one input is high and the other is low
(D) If at least one input is high

Answer

Answer: (B) Only if both the inputs are low

8. An exclusive NOR gate is logically equal to
(A) Inverter followed by an XOR gate
(B) NOT gate followed by an exclusive XOR gate
(C) Exclusive OR gate followed by an inverter
(D) The complement of a NOR gate

Answer

Answer: (C) Exclusive OR gate followed by an inverter

9. The gate ideally suited for bit comparison is a
(A) Two input exclusive NOR gate
(B) Two input exclusive OR gate
(C) Two input NAND gate
(D) Two input NOR gate

Answer

Answer: (A) Two input exclusive NOR gate

10. Two input exclusive NOR gate gives high output
(A) When one input is high and the other is low
(B) Only when both the inputs are low
(C) When both the inputs are the same
(D) Only when both the inputs are high

Answer

Answer: (C) When both the inputs are the same

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