Electronic Principles
In an intrinsic semiconductor, the number of free electrons

Is greater than the number of holes
Is less than the number of holes
Impossible to say
Equals the number of holes
None of these

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Electronic Principles
What is the primary difference between primary and secondary cell batteries?

None of these
Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
Primary-cell batteries can be recharged and used many times, whereas secondary-cell batteries cannot be properly recharged
Primary-cell batteries use chemical cells, whereas secondary-cell batteries use an alternative energy source, such as thermal or magnetic energy, to supplement their outputs
Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries

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Electronic Principles
A low-pass filter:

passes lower-frequency signals and reduces higher-frequency signals
None of these
passes higher-frequency signals and reduces lower-frequency signals
has no effect on ac signals
reduces the level of all frequencies by a significant amount

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