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Ch 18
Test Description: Magnetism
Instructions: Answer all questions to get your test result.
1) if a loop of wire moves in and out of a magnetic field____ is produced
A
voltage
B
charge
C
force
D
current
2) a ______ transofrmer is used near homes to achieve a voltage of120V
A
primary coil
B
step down
C
secondary coil
D
step up
3) the magnetism of a piece of magnetized iron can be weakened by
A
heating and hammering theiron
B
none of the answers are correct
C
bending the iron
D
placing it near unmagnetized iron
4) what instrument is used to trace the direction of a magnetic field
A
limestone
B
compass
C
lodestone
D
transformer
5) what material was used to make the first compass
A
limestone
B
steel
C
iron
D
lodestone
6) magnetic fields are produced by
A
water currents
B
electric currents
C
electric charges
D
gravity
7) groups of atoms that align to form small, magnetized regions in a material are
A
magnetic domains
B
magnetic poles
C
magnetic field lines
D
geographic domains
8) An example of naturally occurring magnetic rock is
A
peastone
B
soapstone
C
lodestone
D
limestone
9) when the loop of wire in an AC generator rotates halfway
A
the current continues in the same direction
B
electrical energy is converted into mechanical energy
C
maximum current is reached
D
the current reverses
10) a machine that converts mechanical energy into electrical energy
A
step down transformer
B
generator
C
step up transformer
D
inductor
*select an answer for all questions
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