Electronic Principles
A low-pass filter:

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

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Electronic Principles
The north pole of a magnet is the one:

None of these
that has its molecules arranged in a random pattern
that would be attracted to the earth's north magnetic pole
that would be repelled by the south pole of another magnet
that would be attracted to the earth's south magnetic pole

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Electronic Principles
Molecule is

A atom that flows whenever there is an imbalance of electrical charges between two points
None of these
A atom that has an excessive number of electrons in its outer orbit
The smallest particle of a substance that retains the properties of that substance
A atom that has a shortage of electrons in its outer orbit

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Electronic Principles
Which one of the following statements is true for the impedance of a series RC circuit?

The impedance is greater than either the resistance or capacitive reactance but less than their sum
The impedance is less than the sum of the resistance and capacitive reactance
The impedance is equal to the sum of the resistance and capacitive reactance
The impedance is greater than the sum of the resistance and capacitive reactance
None of these

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