Electronic Principles
At room temperature an intrinsic silicon crystal acts approximately like

an insulator
a battery
None of these
a conductor
a piece of copper wire

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Electronic Principles
Which one of the following statements is true for current flowing in a parallel circuit?

The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
The total current in a parallel circuit is equal to the total voltage multiplied by the total resistance
None of these
The same current always flows through every part of a parallel circuit
The total current in a parallel circuit is always less than the smallest amount of current

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Electronic Principles
A low-pass filter:

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

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Electronic Principles
What is the difference between the kinds of charges for an electron and a proton?

None of these
An electron has a negative charge and a proton has a positive charge
An electron has a positive charge and a proton has a negative charge
An electron has a positive charge and a proton has no charge
An electron has a negative charge and a proton has no charge

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