CBSE Class 11 Computer Science, Chapter-wise Weightage 2026-27

CBSE Class 11 Computer Science chapter-wise weightage

The 70 theory marks in CBSE Class 11 Computer Science are split across 3 units, and they are not split evenly. Unit 2, Unit 2: Computational Thinking and Programming - 1, alone carries 45 marks, which is 64% of the paper. Studying every unit for the same number of hours is the most common way students lose easy marks.

Where should your revision time go?

Weight your revision the way the paper is weighted. Unit 2 deserves the most passes, and the smallest units are worth securing completely rather than skipping, because they are short enough to finish and are usually asked in predictable ways.

Unit-by-unit

Unit 1: Computer Systems and Organisation (10 marks)

• Basic computer organisation: computer system, hardware, software, input/output devices, CPU, memory (primary, cache, secondary), units of memory (bit, byte, KB, MB, GB, TB, PB)
• Types of software: system software (OS, system utilities, device drivers), programming tools and language translators (assembler, compiler, interpreter), application software
• Operating System: functions of the OS, OS user interface
• Boolean logic: NOT, AND, OR, NAND, NOR, XOR, truth tables, De Morgan's laws, logic circuits
• Number systems: Binary, Octal, Decimal, Hexadecimal and conversion between them
• Encoding schemes: ASCII, ISCII, Unicode (UTF8, UTF32)

Unit 2: Computational Thinking and Programming - 1 (45 marks)

• Introduction to problem-solving: analysing the problem, developing an algorithm, coding, testing and debugging, flowcharts, pseudocode, decomposition
• Basics of Python: features, hello-world program, interactive vs script mode, character set, tokens (keyword, identifier, literal, operator, punctuator), variables, l-value and r-value, comments
• Data types: number (integer, float, complex), boolean, sequence (string, list, tuple), None, mapping (dictionary), mutable and immutable types
• Operators: arithmetic, relational, logical, assignment, augmented assignment, identity (is, is not), membership (in, not in)
• Expressions, statements, type conversion (implicit/explicit), operator precedence, expression evaluation, console input/output
• Errors: syntax errors, logical errors, run-time errors
• Flow of control: indentation, sequential, conditional and iterative flow
• Conditional statements: if, if-else, if-elif-else with flowcharts and simple programs
• Iterative statements: for loop, range(), while loop, break and continue, nested loops, pattern/series/factorial programs
• Strings: operations (concatenation, repetition, membership, slicing), traversal, built-in methods (len, upper, lower, count, find, index, split, replace, strip, etc.)
• Lists: indexing, operations, traversal, built-in methods (append, extend, insert, remove, pop, sort, min, max, sum), nested lists, searching
• Tuples: indexing, operations, built-in methods, tuple assignment, nested tuples, searching

Unit 3: Society, Law and Ethics (15 marks)

• Digital footprints
• Digital society and netizen: net, communication and social media etiquettes
• Data protection: intellectual property rights (copyright, patent, trademark), IPR violations (plagiarism, infringement), open source software and licensing (Creative Commons, GPL, Apache)
• Cyber crime: hacking, eavesdropping, phishing, fraud emails, ransomware, cyber trolls, cyber bullying
• Cyber safety: safe web browsing, identity protection, confidentiality
• Malware: viruses, trojans, adware
• E-waste management: proper disposal of electronic gadgets
• Information Technology Act (IT Act)
• Technology and society: gender and disability issues in computing

Exam pattern

Total 100 marks: Theory 70 marks (Unit 1 - Computer Systems and Organisation: 10, Unit 2 - Computational Thinking and Programming-1: 45, Unit 3 - Society, Law and Ethics: 15) + Practical 30 marks.

Reviewed by Kajal Ma'am (MCA), teaching CBSE Computer Science & Informatics Practices since 2006. Weightage per the official CBSE 2026-27 curriculum.