Class 11 Computer System Chapter 1 Important Questions | CBSE 2026-27
Class 11 Computer System Chapter 1 Important Questions | CBSE 2026-27
Computer Science Chapter 1 Syllabus | CBSE 2026-27
Basic computer organisation: Introduction to Computer System, hardware, software, input device, output device, CPU, memory (primary, cache and secondary), units of memory (bit, byte, KB, MB, GB, TB, PB)
Types of software: System software (Operating systems, system utilities, device drivers), programming tools and language translators (assembler, compiler, and interpreter), application software
Operating System(OS): functions of the operating system, OS user interface
INTRODUCTION
If you are looking for the important question answers for Class 11 Chapter 1 – Computer System, then you are at the right place.
In this blog, you will find a carefully selected collection of important questions and answers from Chapter 1 – Computer System. The questions cover the key concepts of the chapter and are useful for CBSE Class 11 Computer Science students for regular practice, revision, and examination preparation.
The most important part of this blog is that all the answers are explained in very simple and easy-to-understand language, making it easier for students to understand the concepts and prepare for their exams.
Q1. What is a computer? Write the characteristics of computer
Q2. What is a Computer System?
Q3. Draw a block diagram of computer showing it’s various components.
Q4. Which component is considered it’s brain?
Q5. Which of the following is called processor?
- ALU
- CU
- CPU
- HDD
Q6. A CPU can be placed on one or more microchips called ________
- Chips
- Processors
- Integrated Circuits
- Control Units
Q7. What are registers in a Computer System?
Q8. What are the two main components of CPU? Explain in brief.
ALU: ALU performs all the arithmetic and logic operations that need to be done as per the instruction in a program. CU: It interprets instructions and guides data flow through the computer’s memory, ALU and input or output devices.
Q9. What do you mean by an Input Device? Give two examples
Q10. What do you mean by an Output Device? Give two examples.
Q11. Differentiate between Primary memory and Secondary memory.
Primary Memory Secondary Memory It is the main memory of the computer It is used to store data for long term It has less storage capacity It has more storage capacity Example: RAM, ROM Example: Hard Disk, SSD
Q12. Differentiate between RAM and ROM.
RAM ROM It stands for Random Access Memory It stands for Read Only Memory It stores data temporarily It stores data permanently. It is volatile memory. It is a non volatile memory. Data is lost when the computer is switched off Data is not lost when the computer is switched off
Q13. What is cache memory?
Q14. What do you mean by data and information?
Q15. Expand the following
- HDD
- SSD
- IPO
- ALU
- CPU
HDD: Hard Disk Drive SSD: Solid State Disk IPO: Input Process Output ALU: Arithmetic Logic Unit CPU: Central Processing Unit
Q16. Identify the input and output device from the following
- Printer
- Scanner
- Projector
- Keyboard
- Speaker
- Monitor
- Headphone
- Touch Screen
- Microphone
- Barcode Reader
Device Type(Output/Input) Printer Output Scanner Input Projector Output Keyboard Input Speaker Output Monitor Output Headphone Output Touch Screen Input Microphone Input Barcode Reader Input
Q17. Name the input or output device used for the following task.
- To enter textual data
- To build 3D models
- To convert Hard copy to Soft copy
- To display data to the user
- To hear sound or music
- To give an audio command
Task Device Name To enter textual data Keyboard To build 3D models 3D Printer To convert Hard copy to Soft copy Scanner To display data to the user Monitor To hear sound or music Speaker/Headphone/Earphone To give an audio command Microphone
Q18. Match the following with correct memory unit.
| Column A | Column B |
| 1 KB | 1024 GB |
| 1 MB | 1024 MB |
| 1 GB | 1024 Bytes |
| 1 TB | 1024 KB |
Column A Column B 1 KB 1024 Bytes 1 MB 1024 KB 1 GB 1024 MB 1 TB 1024 GB
Q19. Differentiate between Hardware and Software.
Hardware Software It is a physical components of computer. It is a set of instructions or programs. It can be touched and feel. It can not be touched and feel. Example: Speaker, Monitor Example: Windows, MS Word, MS Paint
Q20. Write the three categories of software.
Q21. Differentiate between System software and Application software.
System software Application software It manages the computer system It helps the user to perform a specific task It is required for the system to work. for example Windows It is required for the user to work. for example MS Word, MS Paint
Q22. What is an Operating System? Give two examples.
Q23. Write any four functions of Operating System.
Q24. What do you mean by System software? Give three examples.
Q25. What do you mean by System Utilities? Give two examples of utilities that are shipped with operating system and two that are not shipped with operating system.
Example of utilities shipped with OS: Disk Defragmentation tool, Formatting Utility Example of utilities not shipped with OS: Anti-virus software, Disk Cleaner tool
Q26. What do you mean by device driver? What is the need of device driver?
The purpose of a device driver is to ensure proper functioning of a particular device. for example printer, scanner
Q27. What do you mean by Source Code and Object Code?
Q28. What is Assembler?
Q29. Differentiate between Compiler and Interpreter.
Compiler Interpreter It converts the entire program into machine code in one go. It converts the entire program into machine code line by line. It displays all the errors after compiling the whole program. It displays the error as soon as it encounters it. for example: C, C++ for example: Python
Q30. What do you mean by IDE?
Q31. What do you mean by Application Software? Write its two categories.
Q32. State True or False
A computer system can work without application software, but it cannot work without system software.
Q33. What is General Purpose Software? Give two examples.
Q34. What is Customised Software? Give two examples.
Q35. Differentiate between Proprietary and Free and Open Source Software.
Proprietary Software Free and Open Source Software. Source code is not available Source code is available User may need to purchase the license to use this software No need to purchase license Users can not redistribute the software. Users can redistribute.
Q36. When a computer is turned on, who brings the OS into RAM from the secondary storage?
Q37. Identify the type of software(Proprietary Software, Open Source Software) from the following
- Python
- Libre Office
- Microsoft Office
- Ubuntu
- Quickheal
- Tally
Name of Software Type of Software Python Proprietary Software Libre Office Open Source Software Microsoft Office Proprietary Software Ubuntu Open Source Software Quickheal Proprietary Software Tally Proprietary Software
Q38. What is operating system? What are its primary objectives?
Q39. Name the five types of user interface of Operating System?
Q40. Give two examples of operating systems with the following interface
- Command-based interface
- Graphical user interface
- Touch based interface
- Voice based interface
- Gesture based interface
Graphical User Interface (GUI) – Microsoft Windows, Ubuntu Touch-based interface – Android, iOS Voice-based interface – Android, iOS Gesture-based interface – Microsoft Windows, Android
Q41. What are the functions of Operating System? Explain in brief
1. Process Management: It manages multiple processes and exchange of information among processes. 2. Memory Management: It’s main task is to give (allocate) and take (free) memory from running processes. 3. File Management: It involves the creation, updation, deletion and protection of these files in the secondary memory. 4. Device Management: It manages all the input and output devices such as Keyboard, Mouse etc. connected to the computer
Q42. When a user opens a program, the OS allocates RAM to it, while files are stored and organized on secondary storage. Identify the two OS functions involved and differentiate between them.
Memory Management File Management It manages the main memory (RAM) of the computer. It manages files and folders stored on secondary storage. It allocates and deallocates memory to programs as required. It creates, stores, organizes, renames, and deletes files and folders. Example: Allocating RAM to a program when it is opened. Example: Saving a document and organizing it in a folder.
Disclaimer: I have tried my best to provide accurate, relevant, and exam-oriented important questions for “Class 11 Computer System Chapter 1 Important Questions | CBSE 2026-27.” The questions and answers are prepared with reference to the NCERT Computer Science textbook and the CBSE curriculum and are intended only for educational and revision purposes.
If you find any error, omission, or information that needs correction in the questions or answers given above, please feel free to contact me at csiplearninghub@gmail.com. I will be happy to review and correct it where appropriate.
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Class 11 Computer System Chapter 1 Important Questions | CBSE 2026-27
Class 11 Computer System Chapter 1 Important Questions | CBSE 2026-27
Class 11 Computer System Chapter 1 Important Questions | CBSE 2026-27
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