Science B3: Question Preview (ID: 12141)

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The northern lights are caused by
a) lightning from clouds
b) light bulbs
c) eather patterns in Alaska
d) the earth's magnetic field

Electric current flows through a circuit only when it is
a) open
b) closed
c) split
d) plastic

Electric current is the
a) flow of negative charges through matter
b) flow of air through matter
c) flow of water through matter
d) flow of positive charges through matter

Plasitc and rubber are used to coat electrical wires because they are good
a) instructors
b) resistors
c) insulators
d) conductors

If you hold the north poles of magnets together, they will
a) make Santa appear
b) attract
c) repel
d) spark

Most electric generators make electricity using
a) magnets
b) light
c) air
d) water

If you plug in too many appliances into one circuit, the wires can
a) overload
b) open
c) overheat
d) close

When two objects have different electric charges, they
a) spark
b) sing
c) attract
d) repel

Electric current is the flow of
a) positive charges
b) neutral charges
c) no charges
d) negative charges

A magnet's force is at its poles
a) greatest
b) attracting
c) repelling
d) least

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