AnswersFL-2003310-Physical Science CRUnit Test

Unit Test — Unit test Answers

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How are the magnetic field lines near the south pole of a magnet affected when a second south pole is brought near it?

A
The field lines combine with the lines around the second south pole.
B
The field lines overlap with the lines from the second south pole.
C
The field lines bend toward the second south pole.
D
The field lines bend away from the second south pole.
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Potential difference is measured in which units?

A
volts
B
amps
C
currents
D
watts
23

How are the current and resistance related when the voltage of a circuit is constant?

A
The current doubles when the resistance doubles because they are directly proportional.
B
The current doubles when the resistance doubles because they are inversely proportional.
C
The current is cut in half when the resistance doubles because they are directly proportional.
D
The current is cut in half when the resistance doubles because they are inversely proportional.
24

Cora, an electrician, wraps a copper wire with a thick plastic coating. What is she most likely trying to do?

A
keep the electric potential of the wire balanced
B
decrease the wire’s resistance
C
increase the voltage produced by the wire
D
keep a current from passing out of the wire
25

Jill uses a magnet to pick up a nail. Then, she touches the nail to a paper clip and picks up the paper clip. What will most likely happen when she pulls the magnet away from the nail?

A
The paper clip will stay attached to the nail because the nail is now a permanent magnet.
B
The paper clip will stay attached to the nail because the paper clip is now a permanent magnet.
C
The paper clip will fall off of the nail because the nail was only a temporary magnet.
D
The paper clip will fall off of the nail because the nail is now magnetized in the opposite direction.

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