Electronic Principles
A device that converts mechanical pressure to electrical energy is called a:

photodiode
piezoelectric device
None of these
nicad cell
solar cell

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

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
None of these
that has its molecules arranged in a random pattern

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Electronic Principles
For a pure capacitor:

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

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