Electronic Principles
Waveforms are graphs that show:

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

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Electronic Principles
The total impedance of a parallel RLC circuit:

is maximum at the resonant frequency
always increases as the applied frequency increases
is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
None of these
always decreases as the applied frequency increases

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