Curriculum
Grade XI Informatics Practices
Lessons
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Ch1-Introduction-to-Computer-System
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Ch2-Python-Fundamentals
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Ch3-Control-Flow-in-Python
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Ch4-Lists-and-Dictionaries-in-Python
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Ch5-Database-Concepts-and-RDBMS
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Ch6-SQL-Creating-and-Managing-Tables
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Ch7-SQL-Querying-Data
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Ch8-Emerging-Trends-in-IT
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Ch1-Introduction-to-Computer-System
School Revise · Class 11 Informatics Practices · Chapter 1
Introduction to Computer System
Code 065, Class 11. A computer takes input, processes it and gives output. Here we meet its parts, its memory and the software that runs it.
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What this chapter is about
A computer system is hardware and software working together. It follows the cycle input, process, output, storage.
1. Functional units
The input unit takes data in, the CPU processes it (ALU and Control Unit), the memory stores it, and the output unit shows the result.
2. Memory
Primary memory is fast: RAM is volatile (lost when power is off) and ROM is non volatile. Secondary memory (hard disk, SSD, pen drive) is slower but permanent.
3. Software
System software runs the computer (the operating system, utilities). Application software does a task for the user. Software may be general purpose or made for a specific purpose.
Practise with the interactive
Explore the idea by tapping. The interactive opens right here in the lesson.
Practice set A, multiple choice
1. The brain of the computer is the …
CPU.
2. Which memory is volatile?
RAM.
3. 1 byte equals how many bits?
8 bits.
4. The operating system is an example of …
system software.
Practice set B, short answer
1. Name the four functional units of a computer.
Input, CPU, memory and output units.
2. State one difference between RAM and ROM.
RAM is volatile (lost on power off); ROM is non volatile.
3. What is application software?
Software that does a task for the user, such as a word processor.
Quick summary
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A computer system is hardware plus software, following input, process, output and storage. Its units are input, CPU (ALU and Control Unit), memory and output. RAM is volatile, ROM is non volatile, and secondary memory is permanent. Software is system or application, general or specific purpose. |
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These free Class 11 Informatics Practices notes explain the computer system, functional units, primary and secondary memory, and system and application software with worked examples and practice, for CBSE students across India and the Gulf including the UAE, Saudi Arabia, Qatar, Oman, Kuwait and Bahrain.
© 2026 School Revise. All rights reserved. Original content aligned to the CBSE and NCERT Class 11 Informatics Practices syllabus. Unauthorised copying is not permitted.
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