General exam question G7B03
Subelement G7, PRACTICAL CIRCUITS· Group G7B
G7B03
Which of the following describes the function of a two-input AND gate?
- A.Output is high when either or both inputs are low
- B.Output is high only when both inputs are high (correct answer)
- C.Output is low when either or both inputs are high
- D.Output is low only when both inputs are high
WhyA two-input AND gate's output is high only when both inputs are high. A two-input AND gate's output only goes high when both of its inputs are simultaneously high, that's the defining behavior of the AND function, answer B. If either input is low the output stays low, and the same holds if both inputs are low, so A, C, and D all describe the wrong combination of input states.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.