Question

Which of the following is not a computer operating system?

1. BIOS
2. Mac OS
3. Unix OS
4. Microsoft Windows
5. Both i and ii

Answer 1

Correct Answer - Option 1 : BIOS

The correct answer is BIOS.

BIOS  is not a computer operating system.

• BIOS (basic input/output system)
  • It is a program that is used by a computer's microprocessor to start the computer system after it is powered on.
  • It also manages data flow between the computer's operating system (OS) and attached devices, such as the hard disk, video adapter, keyboard, mouse and printer.

• The Unix
  • A Unix-like family is a diverse group of operating systems, with sub-categories including System V, BSD, and Linux.
  • The name "UNIX" is a trademark of The Open Group which licenses it for use with any operating system that has been shown to conform to their definitions. 
• macOS 
  • It is an open core graphical operating system.
  • It is developed, and marketed, and sold by Apple Inc.
• Microsoft Windows
  • It is a family of proprietary operating systems designed by Microsoft Corporation.
  • It is primarily targeted to Intel architecture based computers.

• Operating system
  • An operating system (OS) is system software that manages computer hardware, software.
  • An operating system is a large and complex system.
  • OS system components include:
    • File,
    • Process,
    • Memory,
    • I/O device management.