Electronic Principles
A low-pass filter:

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

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Electronic Principles
Waveforms are graphs that show:

amplitude on the vertical axis and the passage of time on the horizontal axis
None of these
the passage of time on the vertical axis and amplitude on the horizontal axis
amplitude on the vertical axis and frequency on the horizontal axis
frequency on the vertical axis and amplitude on the horizontal axis

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Electronic Principles
Current is

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

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