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Which limitation does the built in indicator have?

  • A.It indicates only whether the electrolyte level is correct, which tells nothing about the state of charge at all
  • B.It reports the state of charge of one cell only
  • C.It measures the voltage rather than the density, which makes it unreliable immediately after charging the battery
  • D.It cannot be seen

Answer: B

A faulty cell elsewhere in the battery is invisible to it, so a green eye with a battery that will not crank is entirely possible. A low level does turn it clear, which makes the last option a partial truth about its second function. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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