Delhi Police Constable Exam Model Paper 7

An operating system is a collection of programs that controls the overall operations of the computer.

The operating system acts as an intermediate between the user and the computer.

Important operating systems available are:

• Windows.
• Linux.
• Mac OS.
• Unix.
• MS-DOS.
• Ubuntu.

Linux isfree software.

Windows OS was developed by Microsoft.

Mac OS was developed by Apple.

Printer and Plotter are output devices.

MS Office is a software service developed by Microsoft.