Multiple choice general knowledge

Which of the below battery is used in your cellphone to preserve the date and time, even if the mobile is switched off

  1. Metal Oxide Semiconductor (MOS)

  2. P-Type Semiconductor

  3. N-Type Semiconductor

  4. Complementary Metal Oxide Semiconductor (CMOS)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

CMOS (Complementary Metal Oxide Semiconductor) battery is used in cellphones and computers to maintain date/time settings when power is off. It consumes very little power and can last years. MOS, P-Type, and N-Type are semiconductor types but CMOS is the specific technology for RTC backup.

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