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Direct current is described as _____.


A) omnidirectional
B) unidirectional
C) bidirectional

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A semiconductor contains _____ valence electrons.


A) three
B) four
C) five
D) seven

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Matter has mass and occupies space.

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A basic law of physics states that like charges _____ and opposite charges _____.


A) attract; repel
B) repel; attract
C) combine; counteract
D) counteract; combine

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What part of an atom has a positive charge?


A) quark
B) neutron
C) proton
D) electron

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What part of an atom has a negative charge?


A) quark
B) neutron
C) proton
D) electron

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The smallest part of a compound that still retains the properties of that compound is a(n) _______________.

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