Question

BIOS is used:

• A. By operating system
• B. By compiler
• C. By interpreter
• D. By application software

Hint:

BIOS is the first code that runs when you power on the computer, bridging hardware and the OS.

Answer 1

The Correct Option is A

BIOS stands for Basic Input/Output System.
It is firmware stored in a computer’s ROM (Read-Only Memory) chip on the motherboard.
When a computer is powered on, the BIOS performs the POST (Power-On Self Test) to check hardware functionality.
After POST, BIOS loads the bootloader and helps the operating system start by providing low-level communication between the OS and hardware components.
- Option (A) is correct because the BIOS acts as an interface for the operating system to access hardware resources at startup.
- Option (B) Compiler: This is a software tool for converting source code into machine code — unrelated to BIOS functions.
- Option (C) Interpreter: Translates code line-by-line during execution — not a BIOS task.
- Option (D) Application Software: User-level programs like browsers or word processors — BIOS operates at a much lower level.
Therefore, the correct answer is $\mathbfBy\ operating\ system$.