Question

1. what is the purpose of the cmos battery on the motherboard?

a) to power the cpu
b) to maintain bios settings and the real - time clock when the pc is off
c) to power the ram during sleep mode
d) to store firmware updates

Explanation:

The CMOS battery on a motherboard is used to maintain BIOS settings and the real - time clock when the PC is off. When the PC is powered down, the CMOS battery provides a small amount of power to the CMOS chip. This chip stores important configuration information such as BIOS settings (e.g., boot order, hardware settings) and keeps the real - time clock (RTC) running.

• Option A: The CPU is powered by the main power supply of the computer, not by the CMOS battery.
• Option C: RAM (Random - Access Memory) is volatile memory. When the computer is in sleep mode, it is usually maintained by a small amount of power from the main power supply (in some systems, there are specific power management features for sleep mode related to the main power, not the CMOS battery).
• Option D: Firmware updates are typically stored on non - volatile storage devices (such as flash memory on the motherboard for BIOS firmware) and are not directly related to the function of the CMOS battery.

Answer:

B. To maintain BIOS settings and the real - time clock when the PC is off