Discussion
Which specific gravity indicates a fully charged cell?
Answer: B
A charged cell reads about 1.280 and a discharged one about 1.150, with water at 1.000 as the reference. Filling acid is supplied at a lower density than 1.400. A variation of more than fifty points between cells condemns the battery. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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