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

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Electronic Principles
For a pure capacitor:

ac current lags the voltage by 90 degree
ac current is converted to dc voltage
ac current leads the voltage by 90 degree
None of these
ac current and voltage are exactly in phase

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