1.

_______ contains the code, by executing which the CPU access the very first partition of hard disk when we turn on the computer.1. ROM2. DOS3. EHD4. DDS5. BIOS

Answer» Correct Answer - Option 5 : BIOS

The correct answer is BIOS.

  • Due to the fact that the main memory is volatile, when we turn on our computer, the CPU cannot access the main memory directly. However, there is a special program called BIOS stored in ROM that is accessed for the first time by the CPU.
  • BIOS contains the code, by executing which, the CPU access the very first partition of the hard disk that is MBR.
  • It contains a partition table for all the partitions of the hard disk.
  • Since, MBR contains the information about where the operating system is being stored and it also contains a program that can read the boot sector record of the partition, hence the CPU fetches all this information and load the operating system into the main memory.


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