Basic Qualification · B-004 Circuit components · B-004-002-008
What semiconductor device glows different colours, depending upon its chemical composition?
- A A vacuum diode
- B A light-emitting diode
- C A fluorescent bulb
- D A 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
The parts inside the box: resistors, capacitors, inductors, diodes, transistors, tubes and what each does in a circuit.