Advanced Qualification · A-002 Advanced components and circuits · A-002-001-003
What type of semiconductor material contains fewer free electrons than pure germanium or silicon crystals?
- A Bipolar type
- B Superconductor type
- C P-type
- D N-type
Correct answer: C — P-type. From the official ISED question bank, verified word for word.
Why
P-type material is created by adding impurities that create "holes," which are spots missing an electron, resulting in fewer free electrons than in pure silicon or germanium. 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.