Electronic Principles
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

Thermal energy
Doping
None of these
Valence electrons
Free electrons

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Electronic Principles
Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

The voltage remains at one polarity and at a steady level
The voltage reverses polarity periodically
None of these
The voltage remains at one polarity but changes value periodically
The voltage causes current to flow in two directions at the same time

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