Electrical Engineering XYZ MCQs
Why holes are not created in a metal:
- The conduction band and valance band are overlapped
- The forbidden band is missing
- Both of the above
- None of the above
Correct answer: 3. Both of the above
Explanation: In metals, the conduction band and the valence band actually overlap, meaning that there is no distinct energy gap between them. This allows electrons to move freely throughout the material, contributing to its high conductivity.
The concept of a “forbidden band” typically applies to semiconductors, not metals. Semiconductors have a band gap between the valence and conduction bands, and the presence or absence of this gap determines their electrical properties.