Gate behavior check: a multi-input NOR gate produces a logic HIGH at its output only for which specific input pattern?

Introduction / Context:
NOR is a fundamental logic gate defined as the logical complement of OR. Understanding its truth condition is crucial for designing active-low control signals, reset lines, and simple condition detectors. The question asks which input pattern yields a HIGH (1) at the output of a NOR gate.

Given Data / Assumptions:

• NOR output = NOT(OR of all inputs).
• Inputs are standard binary values (0 or 1).
• We consider a NOR with two or more inputs; the property generalizes.

Concept / Approach:
By definition, OR outputs 1 if any input is 1. Therefore, NOR outputs 1 only when OR would output 0, which happens exclusively when every input is 0. Thus, NOR is an “all-zero detect” gate in its simplest interpretation.

Step-by-Step Solution:

Verification / Alternative check:
Truth table inspection for 2-input NOR shows Y=1 only for A=0, B=0. Extending to more inputs preserves the condition: any single 1 forces OR to 1, making NOR 0.

Why Other Options Are Wrong:

Common Pitfalls:
Confusing NOR with NAND; NAND outputs 0 only when all inputs are 1, whereas NOR outputs 1 only when all inputs are 0.

Final Answer:
All inputs are 0s