Electronic Principles
What is the difference between the kinds of charges for an electron and a proton?

An electron has a negative charge and a proton has a positive charge
An electron has a positive charge and a proton has a negative charge
None of these
An electron has a positive charge and a proton has no charge
An electron has a negative charge and a proton has no charge

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Electronic Principles
A low-pass filter:

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
passes lower-frequency signals and reduces higher-frequency signals
None of these

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