Electric Circuits
The indication of the state of charge of a battery is best given by

 level of electrolyte.
 specific gravity of electrolyte.
 temperature of electrolyte.
 colour of electrolyte.

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Electric Circuits
Atoms have no electric charge because they

 have neutrons in their nuclei.
 have an equal number of neutrons and protons.
 have an equal number of electrons and protons.
 have an equal number of charged and non charged particles.

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