Looking for accurate SEBA Class 9 Computer Science Chapter 2 (Operating System and Graphical User Interface) textual solutions for the 2026–27 academic year? Access complete step-by-step solutions covering operating system functions, CLI vs. GUI differences, file and folder management, desktop components, and system utilities to score top marks in your annual exams.
1. Choose the correct option.
(a) Which of the following is an operating system?
(1) Windows
(2) Linus
(3) Unix
(4) All of these
Ans: (4) All of these.
(b) Which Opreting System is developed by CDAC, Chennai?
(1) Windows
(2) BOSS
(3) Unix
(4) None of these
Ans: (2) BOSS.
(c) Which OS has fixed deadline?
(1) Distributed
(2) Real – time
(3) Interactive
(4) Batch Processing
Ans: (2) Real-time.
(d) Name a multiuser Operating system.
(1) MS-DOS
(2) BOSS
(3) Unix
(4) None of these
Ans: (3) Unix.
(e) Neme a version of macOS.
(1) Mojave
(2) High Sierra
(3) Sierra
(4) All of these
Ans: (4) All of these.
(f) In which year was Windows OS released?
(1) 1980
(2) 1985
(3) 1983
(4) 1987
Ans: (2) 1985 .
SEBA Class 9 Computer Science Chapter 2 Solutions
2. Fill in the blanks.
(a) _ is the founder of Microsoft Corporation.
Ans: Bill Gates.
(b) An operating system is a program which acts as an _ between a user and the hardware.
Ans: interface.
(c) The operating system decides which job should use the _ and for how long .
Ans: processor.
(d) A computer system works with _.
Ans: information.
(e) Windows is an example of _ operating system.
Ans: proprietary.
(f) Unix was originally developed in _ by a group of AT&T employees.
Ans: 1969.
Class 9 Computer Science Chapter 2 Question Answer SEBA 2026-27
3. State true or false.
(a) Microsoft Windows has 15 versions since its first release in 1985.
Ans: FALSE.
(b) Linux is different from proprietary software like Windows, which can be modified by the company that owns it.
Ans: TRUE.
(c) iOS is Apple’s mobile operating system.
Ans: FALSE.
(d) The latest version of Android is Unnati.
Ans: FALSE.
(e) Windows come pre-loaded on most new PCs.
Ans: TRUE.
(f) macOS is Apple’s mobile operating system.
Ans: TRUE.
Operating System Class 9 SEBA Chapter 2 Solutions
Q4. Short answer questions.
Q1. What is an Operating system?
Ans: An operating system is the main software of a computer. It manages memory, processes, software, and hardware. It also helps you use the computer without needing to understand its internal language.
2. Mention the names of any two commonly used operating system.
Ans: Two commonly used operating systems are:
Windows
iOS
3. When was the first version of Apple iOS released?
Ans: The first version of Apple iOS came out on July 29, 2007.
4. What do you mean by multitasking?
Ans: Multitasking in an operating system lets you do more than one task on a computer at the same time.
5. What is real-time operating system?
Ans: In a real-time operating system, tasks have set deadlines and must be finished on time. The system’s performance is judged by how well it meets these deadlines. Examples include LynxOS and Windows CE.
6. What is time sharing and distributive operating system?
Ans: Time Sharing OS: A time-sharing operating system allows multiple users or tasks to use the system’s resources, like the CPU, memory, and devices, at the same time.
Distributed OS: A distributed operating system splits its workload across multiple servers, sharing data and resources to work more efficiently.
Users should be free to name their files as they like, without worrying about other users using the same file name.
Users should be able to share the files they create and also access files created by other users.
SEBA Class 9 Computer Science Ch 2 Textbook Answers
5. Long answer questions.
1. Explain any Five functions of an Operating system.
Ans: Five functions of an Operating system are:
i) Processor Management: The operating system decides which tasks use the CPU and for how long in a multi-tasking environment. This process is called Process Scheduling.
ii) Memory Management: The OS keeps track of the computer’s memory, deciding which tasks get memory and when. It also gives and takes back memory when needed.
iii) Device Management: The OS manages how devices are used, keeping track of which task is using which device and for how long.
iv) Security: The OS protects your data by using passwords, preventing unauthorized access, and ensuring your data is safe. Security measures include login protection, firewalls, and guarding system memory.
v) File Management: The OS organizes and manages your files, folders, and directories.
2. Explain any two- operating system used in mobile phones.
Ans: Android OS: Android is an operating system for mobile phones and tablets. It is based on a modified version of Linux and is open-source, meaning anyone can use and modify it.
iOS: iOS is a mobile operating system made by Apple. It works on devices like the iPhone, iPad, and iPod. The first version of iOS was released on July 29, 2007.
3. Write a short note on Windows operating system.
Ans: Windows is a computer operating system made by Microsoft. It allows users to store and open files, run programs, play games, watch videos, and use the internet. It is designed for both home and office use. The first version, called Windows 1.0, was released in 1985. Over time, Windows has improved with new features like the Start Menu, Taskbar, and File Explorer, making it easier to use. It works with many software programs and hardware devices, making it one of the most popular operating systems in the world. Some of the well-known versions include Windows XP, Windows 7, Windows 10, and Windows 11. The latest version, Windows 11, has a modern design, better performance, and stronger security. Windows is popular because it is easy to use, supports multitasking, and gets regular updates to improve performance and safety.
4. Write a note on the Operating systems created by Apple.
Ans: Apple has created different operating systems for its devices. macOS is used in Mac computers and laptops, offering a smooth, secure, and user-friendly experience. iOS is the operating system for iPhones, while iPadOS is designed for iPads, providing better multitasking and Apple Pencil support. watchOS runs on the Apple Watch, helping users track fitness and notifications. tvOS is used in Apple TV, allowing users to stream videos and use apps. All these operating systems work well together, making Apple devices easy to use and highly secure.
5. What is BOSS?
Ans: Bharat Operating System Solution (BOSS) is a free, open-source operating system based on Linux. It is built on Debian and has a desktop environment that supports Indian languages. It was developed by the Centre for Development of Advanced Computing (C-DAC) to promote the use of free software across India.
Class 9 Computer Science Operating System GUI Solutions
6. Write a short note on Bill Gates.
Ans: Bill Gates, born on October 28, 1955, is an American businessman and software creator. He founded Microsoft. At Microsoft, he worked as chairman, CEO, president, and chief software developer. Microsoft Windows has had 10 versions since it was first launched in November 1985. Over the years, Windows has changed a lot and now uses touch screens instead of just keyboards and mice.
7. What is Interactive Operating system? Where is it used?
Ans: An interactive operating system lets users directly interact with the system while programs are running. It has an interface, which can either be a command line or a graphical interface. These systems are designed for lots of user-computer interaction. Common examples include Macintosh and Windows. Games and simulations are also interactive systems.
8. What are the two important features that must be taken care while maintaining a directory?
There are two important things to consider when managing a directory:
Ans: Users should be free to name their files as they like, without worrying about other users using the same file name.
Users should be able to share the files they create and also access files created by other users.
💻 Updated Solutions Notice: This page features complete, step-by-step SEBA Class 9 Computer Science Chapter 2 (Operating System and Graphical User Interface) Textual Solutions updated for the 2026–27 academic session. All textbook questions, exercise short/long answers, GUI operations, and practical concepts strictly follow the latest revised Assam Board curriculum.
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