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Which instrument measures the specific gravity of the electrolyte?

  • A.A hydrometer
  • B.A voltmeter, which indicates the state of charge and therefore the density of the electrolyte within the cell
  • C.A multimeter
  • D.A refractometer, which measures the refractive index of the electrolyte and therefore gives the same information

Answer: A

A hydrometer floats in the electrolyte and its depth indicates the density, which relates directly to state of charge. Optical refractometers do the same job and are genuinely used, which makes the last option a real alternative instrument. Checking which component actually carries the load settles most questions of this kind at once. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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