CBSE · Class 11 · Computer Science · Weightage
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.
| Unit | Topic | Marks |
|---|---|---|
| Unit 1 | Unit 1: Computer Systems and Organisation | 10 |
| Unit 2 | Unit 2: Computational Thinking and Programming - 1 | 45 |
| Unit 3 | Unit 3: Society, Law and Ethics | 15 |
| Total | Theory | 70 |
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.
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Frequently asked questions
Which unit has the highest weightage in CBSE Class 11 Computer Science?+
Unit 2, Unit 2: Computational Thinking and Programming - 1, at 45 of the 70 theory marks (64% of the paper).
How are the 70 theory marks split in CBSE Class 11 Computer Science?+
Unit 1: Computer Systems and Organisation 10; Unit 2: Computational Thinking and Programming - 1 45; Unit 3: Society, Law and Ethics 15.
Is there a practical component in CBSE Class 11 Computer Science?+
Practical exam carries 30 marks: Lab Test - Python program (12 marks; 60% logic + 20% documentation + 20% code quality); Report File of minimum 20 Python programs (7 marks) plus Viva voce (3 marks); and a Project using most of the concepts learnt (8 marks).