What does a truth table show in logic?

• A. The memory addresses of a CPU
• B. All possible inputs and outputs for a logic gate
• C. The sequence of steps in an algorithm
• D. The wiring diagram of a circuit

Answer: (B)

Truth tables show how a boolean expression or logic gate behaves for every possible combination of inputs. They lay out all input scenarios and the corresponding output, so you can clearly see how the gate responds in each case. For example, an AND gate with two inputs has four possible input pairs: both false yields false, one false yields false, and only when both inputs are true does the output become true. This is what a truth table makes explicit.

This helps with design and verification because you can quickly check that the gate does the expected thing in every situation. It’s not about where data is stored, the steps an algorithm takes, or how the circuit is wired; it’s about the functional input-output mapping of the logic.