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____________ is used to check the state of charge of a battery.

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____________ is used to check the state of charge of a battery.

(a) Battery charger

(b) Hygrometer

(c) Hydrometer

(d) Battery eliminator

I got this question in a national level competition.

My question is from Engine Performance Characteristics topic in division Measurements and Testing/Performance Parameters and Characteristics of IC Engine

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The correct answer is:

(c) Hydrometer

A hydrometer is used to check the state of charge of a battery. It measures the specific gravity of the battery’s electrolyte, which can indicate the level of charge in the battery. A higher specific gravity generally corresponds to a fully charged battery, while a lower value indicates a discharged state.

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