# Switching Circuits Questions and Answers – Boolean Algebra Basic Operations

This set of Switching Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Boolean Algebra Basic Operations”.

1. Identify the logic gate corresponding to the below symbol.

a) NAND gate
b) OR gate
c) AND gate
d) NOT gate

Explanation: The NOT gate is the only logic gate with a single input. The other logic gates like OR, AND, NAND etc. have more than one input.

2. Identify the operation represented by the following switching circuit.

a) NAND
b) OR
c) AND
d) NOT

Explanation: As the switches are connected in series, the AND operation is realised because current flows only when all of the switches are closed.

3. The NOT gate has only one input.
a) True
b) False

Explanation: The NOT gate accepts only one input and inverts it. If the input is 0, the output is 1. If the input is 1, the output is 0.

4. Switches connected in parallel represent which operation?
a) OR
b) AND
c) NOT
d) NAND

Explanation: Switches connected in parallel represent OR operation, because if any one or more of the switches are closed the current flows.

5. Identify the logic gate corresponding to the below symbol.

a) OR gate
b) AND gate
c) NOT gate
d) NAND gate

Explanation: The logic gate symbol shown above is that of the AND gate. The AND gate outputs 1 only when all of its inputs are 1.

6. Identify the logic gate corresponding to the below symbol.

a) AND gate
b) NOR gate
c) OR gate
d) NOT gate

Explanation: The logic gate symbol shown above is that of the OR gate. The Or gate outputs 0 only when all of its inputs are 0.

7. The AND operation is also referred to as logical multiplication.
a) True
b) False

Explanation: The AND operation is referred to as logical multiplication as it is not the regular multiplication, but it operates on bits and outputs 1 only when all of its inputs are 1.

8. What is the complement of 0?
a) Unknown value
b) High impedance
c) 0
d) 1

Explanation: The complement of 0 is 1 and the complement of 1 is 0. The complement function is performed by the NOT gate.

9. What is the complement of 1?
a) Unknown value
b) High impedance
c) 0
d) 1

Explanation: The complement of 0 is 1 and the complement of 1 is 0. The complement function is performed by the NOT gate.

10. Which operation performs Logical inversion?
a) OR
b) NOT
c) AND
d) BUFFER

Explanation: Logical inversion is performed by the NOT gate. The output is 0 if the input is 1 and the output is 1 if the input is 0.

Sanfoundry Global Education & Learning Series – Switching Circuits.

To practice all areas of Switching Circuits, here is complete set of 1000+ Multiple Choice Questions and Answers.

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