SEBA Class 9 Computer Science Chapter 2 - Operating System and Its Importance Notes PDF
2.1 Introduction
An Operating System (OS) is one of the most important software components of a computer system. It acts as a bridge between the user and the computer hardware. Without an operating system, a computer cannot function properly.
The operating system manages computer hardware, memory, files, software applications, and input-output devices. It also provides a user-friendly environment for running programs.
2.2 Why to Learn Operating System?
Computer hardware understands only machine language. The operating system acts as an interface between the user and the computer hardware.
- Provides communication between user and computer
- Controls hardware resources
- Runs application software
- Manages files and memory
- Makes computer usage easier
2.3 Need of Operating System
1. Platform for Application Programs
The operating system provides a platform where application software can run properly.
2. Booting
The OS helps to start the computer system during booting.
3. Consistent User Interface
The operating system provides a user-friendly interface for users.
4. Managing Input and Output Devices
It controls devices such as keyboard, mouse, monitor, and printer.
5. Multitasking
The OS allows users to perform multiple tasks simultaneously.
6. Manages Files
Operating systems organize and manage files and folders.
7. Provides Security
The OS protects applications and data through authorization and security features.
2.4 Functions of Operating System
1. Processor Management
The operating system decides which process should use the processor and for how long.
2. Memory Management
The OS keeps track of memory usage and allocates memory to different programs.
3. Device Management
It controls and manages all hardware devices connected to the computer.
4. Information Management
The operating system stores and manages information efficiently.
5. File Management
It manages files, folders, and directories in the computer system.
2.5 Types of Operating Systems
1. Batch Processing Operating System
In this system, jobs are grouped into batches and processed together.
2. Distributed Operating System
A distributed operating system manages multiple computers connected together.
3. Real Time Operating System
A real time operating system performs tasks within fixed deadlines.
4. Interactive Operating System
This operating system allows direct interaction between users and computers.
5. Time Sharing Operating System
Multiple users can use the system simultaneously using time sharing.
6. Network Operating System
A network operating system manages computers connected through networks.
2.6 Some Common Operating Systems
Windows
Windows is one of the most popular operating systems developed by Microsoft.
UNIX
UNIX is a multiuser operating system developed at AT&T Bell Laboratories.
Linux
Linux is a free and open-source operating system.
macOS
macOS is Apple's operating system for Macintosh computers.
iOS
iOS is Apple's mobile operating system used in iPhone and iPad devices.
Android
Android is a mobile operating system used in smartphones and tablets.
BOSS
BOSS stands for Bharat Operating System Solutions developed by C-DAC, India.
2.7 Difference Between 32-bit and 64-bit Operating System
| 32-bit OS | 64-bit OS |
|---|---|
| Supports up to 4 GB RAM | Supports more than 4 GB RAM |
| Slower performance | Faster performance |
| Less processing power | More processing power |
2.8 OS Directory Structure
A directory is a container used to organize files and folders in a computer system.
The directory structure helps users:
- Store files properly
- Find files easily
- Manage large amounts of data
- Protect files from unauthorized access
Important information stored in a directory:
- Name
- Type
- Location
- Size
- Position
- Protection
- Usage
Advantages of Operating System
- Makes computer easy to use
- Supports multitasking
- Provides security
- Efficient resource management
- Organizes files and folders
Limitations of Operating System
- Some operating systems are costly
- Requires regular updates
- Can be affected by viruses
- Heavy systems may become slow
Important Keywords
| Term | Meaning |
|---|---|
| Operating System | Software that manages computer hardware and software |
| Multitasking | Performing multiple tasks at the same time |
| Directory | Collection of files and folders |
| Booting | Starting the computer system |
| Memory Management | Managing computer memory resources |
Summary
In this chapter, we learned about Operating Systems and their importance in computer systems. We studied the need, functions, and types of operating systems. We also learned about common operating systems like Windows, Linux, Android, and macOS along with directory structures and differences between 32-bit and 64-bit systems.
Frequently Asked Questions (FAQ)
1. What is an Operating System?
An Operating System is software that acts as an interface between the user and computer hardware.
2. Name two operating systems.
Windows and Linux.
3. What is multitasking?
Multitasking means performing multiple tasks at the same time.
4. What is booting?
Booting is the process of starting a computer system.
5. What is BOSS?
BOSS stands for Bharat Operating System Solutions developed in India.
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End of Chapter 2 – Operating System and Its Importance
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