CBSE Class 11 Computer Science Syllabus 2020-21| Check Latest Exam Pattern

CBSE has released revised Class 11 Computer Science Syllabus 2020-21. The board has decided to reduce the syllabus due to coronavirus health crisis. The question paper will be of 70 marks while practical will be of 30 marks.

CBSE Class 11 Computer Science Syllabus 2020-21

Unit No.
Unit Name
Theory Marks
I Computer Systems and Organisation 10
II Computational Thinking and Programming - 1 45
III Society, Law and Ethics 15
- Total 70

Unit I: Computer Systems and Organisation

• Basic computer organisation: description of a computer system and mobile system, CPU, memory, hard disk, I/O, battery.

• Types of software: Application software, System software and Utility software.

• Memory Units: bit, byte, MB, GB, TB, and PB.

• Boolean logic: NOT, AND, OR, NAND, NOR, XOR, NOT, truth tables and De Morgan’s laws, Logic circuits.

• Number System: numbers in base 2, 8, 16 and binary addition.

• Encoding Schemes : ASCII, ISCII and Unicode

• Concept of Compiler and Interpreter

• Operating System (OS) - need for an operating system, brief introduction to functions of OS, user interface

Unit II: Computational Thinking and Programming - 1

• Introduction to Problem solving: Problem solving cycle - Analysing a problem, designing algorithms and representation of algorithm using flowchart and pseudo-code.

• Familiarization with the basics of Python programming: a simple “hello world" program, the process of writing a program (Interactive & Script mode), running it and print statements; simple data-types: integer, float and string.

• Features of Python, Python Character Set, Token & Identifiers, Keywords, Literals, Delimiters, Operators.

• Comments: (Single line & Multiline/ Continuation statements), Clarity & Simplification of expression

• Introduce the notion of a variable and methods to manipulate it (concept of L-value and R-value even if not taught explicitly).

• Knowledge of data types and operators: accepting input from the console, assignment statement, expressions, operators and their precedence.

• Operators & types: Binary operators-Arithmetic, Relational Operators, Logical Operators, Augmented Assignment Operators.

• Execution of a program, errors- syntax error, run-time error and logical error.

• Conditional statements: if, if-else, if-elif-else; simple programs: e.g.: absolute value, sort 3 numbers and divisibility of a number.

• Notion of iterative computation and control flow: for(range(),len()), while, using flowcharts, suggested programs: calculation of simple and compound interests, finding the factorial of a positive number etc.

• Strings: Traversal, operations – concatenation, repetition, membership; functions/methods–len(), capitalize(), title(), upper(), lower(), count(), find(), index(), isalnum(), islower(), isupper(), isspace(), isalpha(), isdigit(), split(), partition(), strip(), lstrip(), rstrip(), replace(); String slicing.

• Lists: Definition, Creation of a list, Traversal of a list. Operations on a list - concatenation, repetition, membership; functions/methods–len(), list(), append(), extend(), insert(), count(), index(), remove(), pop(), reverse(), sort(), min(), max(), sum(); Lists Slicing; Nested lists; finding the maximum, minimum, mean of numeric values stored in a list; linear search on list of numbers and counting the frequency of elements in a list.

• Tuples: Definition, Creation of a Tuple, Traversal of a tuple. Operations on a tuple - concatenation, repetition, membership; functions/methods – len(), tuple(), count(), index(), sorted(), min(), max(), sum(); Nested tuple; Tuple slicing; finding the minimum, maximum, mean of values stored in a tuple; linear search on a tuple of numbers, counting the frequency of elements in a tuple.

• Dictionary: Definition, Creation, Accessing elements of a dictionary, add an item, modify an item in a dictionary; Traversal, functions/methods – len(), dict(), keys(), values(), items(), get(), update(), del(), del, clear(), fromkeys(), copy(), pop(), popitem(), setdefault(), max(), min(), count(), sorted() copy(); Suggested programs : count the number of times a character appears in a given string using a dictionary, create a dictionary with names of employees, their salary and access them.

• Introduction to Python modules: Importing math module (pi, e, sqrt, ceil, floor, pow, fabs, sin, cos, tan); random module (random, randint, randrange), statistics module (mean, median, mode).

Unit III: Society, Law and Ethics

• Cyber safety: safely browsing the web, identity protection, confidentiality, social networks, cyber trolls and bullying.

• Appropriate usage of social networks: spread of rumours, and common social networking sites (Twitter, LinkedIn, and Facebook) and specific usage rules.

• Safely accessing web sites: adware, malware, viruses, trojans

• Safely communicating data: secure connections, eavesdropping, phishing and identity verification.

• Intellectual property rights, plagiarism, digital rights management, and licensing (Creative Commons, GPL and Apache), open source, open data, privacy.

• Privacy laws, fraud; cyber-crime- phishing, illegal downloads, child pornography, scams; cyber forensics, IT Act, 2000.

• Technology and society:
→ understanding of societal issues and cultural changes induced by technology.
→ E-waste management: proper disposal of used electronic gadgets.
→ Identity theft, unique ids and biometrics.
→ Gender and disability issues while teaching and using computers.

Practical (30 Marks)

1. Lab Test (12 marks)
• Python program (60% logic + 20% documentation + 20% code quality) - 12 Marks

2. Report File + Viva (10 marks)
• Report file: Minimum 20 Python programs - 7 Marks
• Viva voce - 3 Marks

3. Project (8 marks)
(that uses most of the concepts that have been learnt See CS-XII for the rules regarding the projects)

Download Class 11 Computer Science Syllabus 2020-21

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