Basic Qualification · B-004 Circuit components · B-004-002-008
What semiconductor device glows different colours, depending upon its chemical composition?
- AA vacuum diode
- BA light-emitting diode
- CA fluorescent bulb
- DA neon bulb
Correct answer: B — A light-emitting diode. From the official ISED question bank, verified word for word.
Why
A light-emitting diode is a semiconductor that glows when electricity passes through it, and the specific colour it produces depends entirely on the chemical materials used to build the chip. The full explanation — and one for every question — is in Pro.
Practise this section
Circuit components is section B-004 of the Basic exam: The parts inside the box: resistors, capacitors, inductors, diodes, transistors, tubes and what each does in a circuit.
Drill B-004 — free, no account