IGCSE Computer Science Practice Test 2025 - Free Computer Science Exam Questions and Study Guide

Question: 1 / 400

What is the output of an OR logic gate?

0 unless both inputs are 1

1 if either input is 1

1 unless both inputs are 0

The output of an OR logic gate is 1 if either of its inputs is 1, and it only outputs 0 when both inputs are 0. This means that in any case where at least one of the inputs is true (1), the output will also be true (1). The correct understanding of an OR gate is that its function is to perform a logical disjunction; it validates the presence of truth in either of the input signals.

To clarify, when one input is 1, the OR gate outputs 1 regardless of the state of the other input. Therefore, the output will be 0 only when both inputs are 0, which reaffirms that the correct answer is not C, but rather B. This captures the true operational principle of an OR logic gate.

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0 if at least one input is 1

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