Electronic Principles
The rise time of a pulse waveform is the time required for the voltage to rise:

from 10% of the peak value to 70.7% of the peak value
None of these
from 10% of the peak value to 90% of the peak value
from zero to its rms value
from zero to its peak value

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Electronic Principles
Waveforms are graphs that show:

amplitude on the vertical axis and frequency on the horizontal axis
the passage of time on the vertical axis and amplitude on the horizontal axis
None of these
frequency on the vertical axis and amplitude on the horizontal axis
amplitude on the vertical axis and the passage of time 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 decreases as the applied frequency increases
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

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