Electronic Principles
A high-pass filter:

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

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Electronic Principles
Current is

An imbalance of electrical charges
None of these
The number of free electrons in an atom
The force that causes electrons to flow
The flow of charged particles through a material

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