Discussion
Which of the following is NOT an application of Mercury cell?
Answer: D
An automobile ignition battery is not an application of a mercury cell. Mercury cells give a very steady voltage at a small current and are made in small button sizes, so they are used in digital watches, calculators and hearing aids.
A car's ignition and starting need a large current for a short time, which is the job of a lead-acid secondary battery. So the fourth option is the answer.
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