Which logic circuit's output is 0 when all inputs are 1?

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Study for the AAMI Certified Associate in Biomedical Technology Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which logic circuit's output is 0 when all inputs are 1?

Explanation:
The main idea is how a NAND gate responds to all inputs being high. A NAND gate outputs the opposite of the AND of its inputs. When every input is 1, the AND result is 1, and negating that gives 0. That exactly matches the condition. For a multi-input gate, this is the clear case where the output becomes 0 under all-ones inputs. The NOT gate would also give 0 for a single input of 1, but it doesn’t capture the multi-input scenario described here. OR would produce 1 when all inputs are 1, and AND would produce 1 as well, not 0. So NAND is the correct choice.

The main idea is how a NAND gate responds to all inputs being high. A NAND gate outputs the opposite of the AND of its inputs. When every input is 1, the AND result is 1, and negating that gives 0. That exactly matches the condition. For a multi-input gate, this is the clear case where the output becomes 0 under all-ones inputs. The NOT gate would also give 0 for a single input of 1, but it doesn’t capture the multi-input scenario described here. OR would produce 1 when all inputs are 1, and AND would produce 1 as well, not 0. So NAND is the correct choice.

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