Operating Systems — Chapter Summary
NIOS · Class 12 · Computer Science
Summary of Operating Systems for NIOS Class 12 Computer Science. Part of the NIOS Class 12 Computer Science syllabus.
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Overview
An Operating System (OS) is the most critical system software that runs on every computer. It acts as an intermediary between users and computer hardware, managing all hardware resources and providing a platform for application programs to run. Without an operating system, a computer would be unusab
Key Concepts
An Operating System is a collection
An Operating System is a collection of software programs that manages computer hardware resources and provides common services for computer programs.
A process is a program
A process is a program in execution state. The OS manages all processes running on a computer by allocating CPU time, memory, and other resources to e
The OS keeps track of all
The OS keeps track of all memory locations in the computer's RAM, recording which locations are assigned to which processes and which are free. It det
The OS manages all input devices
The OS manages all input devices (keyboard, mouse, touchscreen) and output devices (printer, monitor, speakers). When you press a key or click the mou
The OS manages secondary storage devices
The OS manages secondary storage devices (hard drives, SSDs, USB drives, etc.) where programs and data are permanently stored. Files are organized in
Learning Objectives
- Understand the definition and purpose of an Operating System
- Learn the major functions of an Operating System including process management, memory management, I/O management, and file management
- Identify and compare different types of operating systems such as Windows, Linux, UNIX, iOS, and Android
- Understand the difference between Command Line Interface (CLI) and Graphical User Interface (GUI)
- Recognize the role of OS in managing computer resources and preventing program interference
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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