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Class XI · Computer Science

CBSE · Code 083 · 3 units

Class XI Computer Science

Computer systems, Boolean logic, number systems, complete Python (operators to modules) and society, law and ethics.

Chapters
21
Practice quizzes
21
Session
2026–27
Unit 1

Unit 1 — Computer Systems and Organisation

6 chapters
Chapter 01

Basic Computer Organisation

Hardware · Software · CPU · Memory

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Chapter 02

Types of Software

System Software · Programming Tools · Application Software

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Chapter 03

Operating System

Functions · User Interfaces · Types · Boot

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Chapter 04

Boolean Logic

Gates · Truth Tables · De Morgan's Laws · Logic Circuits

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Chapter 05

Number Systems

Binary · Octal · Decimal · Hexadecimal · Conversions

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Chapter 06

Encoding Schemes

ASCII · ISCII · Unicode · UTF-8 · UTF-32

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Unit 2

Unit 2 — Computational Thinking and Programming

14 chapters
Chapter 07

Introduction to Problem Solving

Steps · Algorithms · Flowcharts · Pseudocode · Decomposition
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Chapter 08

Getting Started with Python

Python basics · Execution modes · Tokens · Variables · Comments
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Chapter 09

Python Data Types

Numbers · Booleans · Sequences · Dictionaries · None · Mutable vs Immutable
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Chapter 10

Python Operators

Arithmetic · Relational · Logical · Assignment · Identity · Membership
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Chapter 11

Expressions, Statements, Type Conversion & I/O

Expression · Statement · Precedence · Type casting · input() · print()
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Chapter 12

Errors in Python

Syntax Errors · Run-time Errors · Logical Errors · Debugging
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Chapter 13

Flow of Control — Introduction

Sequential · Conditional · Iterative · The role of indentation
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Chapter 14

Conditional Statements

if · if-else · if-elif-else · Nested if · Flowcharts · Worked Programs
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Chapter 15

Iterative Statements (Loops)

for · while · range() · break · continue · nested loops · suggested programs
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Chapter 16

Strings

Creation · Indexing · Slicing · Traversal · Methods

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Chapter 17

Lists

Creation · Indexing · Slicing · Methods · Nested lists · Worked Programs

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Chapter 18

Tuples

Creation · Indexing · Unpacking · Built-ins · Nested Tuples

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Chapter 19

Dictionaries

Key · Value · Access · Mutability · Traversal · Methods

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Chapter 20

Introduction to Python Modules

import · from · math · random · statistics

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Unit 3

Unit 3 — Society, Law and Ethics

1 chapters
Chapter 21

Society, Law and Ethics

Digital Footprints · Netiquette · IPR · Cyber Crime · Malware · E-waste · IT Act

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