Advanced Qualification · A-002 Advanced components and circuits · A-002-001-002

In what application is gallium-arsenide used as a semiconductor material in preference to germanium or silicon?

1. A At very low frequencies
2. B In bipolar transistors
3. C At microwave frequencies
4. D In high-power circuits

Correct answer: C — At microwave frequencies. From the official ISED question bank, verified word for word.

Why

Gallium-arsenide is a special semiconductor that lets electrons move much faster than in silicon or germanium, making it ideal for circuits handling very high-frequency signals like those at microwave frequencies. 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.

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