Advanced Qualification · A-002 Advanced components and circuits · A-002-010-004
What is a NOT gate (also known as an INVERTER)?
- A A circuit that allows data transmission only when its input is high
- B A circuit that produces a logic "1" at its output when the input is logic "1"
- C A circuit that produces a logic "0" at its output when the input is logic "1"
- D A circuit that does not allow data transmission when its input is high
Correct answer: C — A circuit that produces a logic "0" at its output when the input is logic "1". From the official ISED question bank, verified word for word.
Why
A NOT gate, or inverter, simply flips the signal it receives: if you feed it a logic "1" (high voltage), it immediately outputs a logic "0" (low voltage), and vice versa. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.