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Science B3
Test Description: December 2012
Instructions: Answer all questions to get your test result.
1) The northern lights are caused by
A
lightning from clouds
B
eather patterns in Alaska
C
light bulbs
D
the earth's magnetic field
2) Electric current flows through a circuit only when it is
A
closed
B
plastic
C
split
D
open
3) Electric current is the
A
flow of water through matter
B
flow of air through matter
C
flow of positive charges through matter
D
flow of negative charges through matter
4) Plasitc and rubber are used to coat electrical wires because they are good
A
insulators
B
resistors
C
instructors
D
conductors
5) If you hold the north poles of magnets together, they will
A
attract
B
make Santa appear
C
repel
D
spark
6) Most electric generators make electricity using
A
light
B
magnets
C
air
D
water
7) If you plug in too many appliances into one circuit, the wires can
A
overheat
B
open
C
close
D
overload
8) When two objects have different electric charges, they
A
spark
B
repel
C
attract
D
sing
9) Electric current is the flow of
A
negative charges
B
no charges
C
neutral charges
D
positive charges
10) A magnet's force is at its poles
A
repelling
B
attracting
C
greatest
D
least
*select an answer for all questions
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