# CBSE Revision Notes for Class 11 Computer Science

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## CBSE Revision Notes for Class 11 Computer Science - Pdf

We think the first step is motivating yourself to revise. What are you trying to achieve here? What’s your ultimate goal? Make a schedule for your revision and be realistic about it. Figure out how much time you can spend on a task each day. The important part of exam preparation and the key to success, as the more you revise these notes. These revision notes are prepared by our finest and experienced teachers. You can download class 11 Computer Science Revision Notes in PDF format. These Revision Notes are also available in the myCBSEguide website and mobile app for free.

Download CBSE Revision Notes for CBSE Class 11 Computer Science Programming and Computational Thinking Familiarization with the basics of Python programming: a simple “hello world" program, process of writing a program, running it, and print statements; simple data-types: integer, float, string 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. Conditional statements: if, if-else, if-elif-else; simple programs: e.g.: absolute value, sort 3 numbers, and divisibility. Notion of iterative computation and control flow: for, while, flowcharts, decision trees and pseudo code; write a lot of programs: interest calculation, primarily testing, and factorials. Idea of debugging: errors and exceptions; debugging: pdb, break points. Lists, tuples and dictionary: finding the maximum, minimum, mean; linear search on list/tuple of numbers, and counting the frequency of elements in a list using a dictionary. Introduce the notion of accessing elements in a collection using numbers and names. Sorting algorithm: bubble and insertion sort; count the number of operations while sorting. Strings: compare, concat, substring; notion of states and transitions using state transition diagrams.

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Download CBSE Revision Notes for CBSE Class 11 Computer Science Term 1 - Computer Systems and Organisation Basic computer organisation: description of a computer system and mobile system, CPU, memory, hard disk, I/O, battery, power. Types of software: application, OS, utility, libraries. Language of Bits: bit, byte, MB, GB, TB, and PB. Boolean logic: OR, AND, NAND, NOR, XOR, NOT, truth tables, De Morgan’s laws Information representation: numbers in base 2, 8, 16, unsigned integers, binary addition Strings: ASCII, UTF8, UTF32, ISCII (Indian script code) Execution of a program: basic flow of compilation – programbinaryexecution Interpreters (process one line at a time), difference between a compiler and an interpreter Running a program: Notion of an operating system, how an operating system runs a program, idea of loading, operating system as a resource manager. Concept of cloud computers, cloud storage (public/private), and brief introduction to parallel computing.

Download CBSE Revision Notes for CBSE Class 11 Computer Science Term 1&2 - Data Management Relational databases: idea of a database and the need for it, relations, keys, primary key, foreign key; use SQL commands to create a table, keys, foreign keys; insert/delete an entry, delete a table. SQL commands: select, project, and join; indexes, and a lot of in-class practice. Basics of NoSQL databases - Mongo DB.

Download CBSE Revision Notes for CBSE Class 11 Computer Science Term 2 - Society Law and Ethics Cyber safety 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.

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## CBSE Class-11 Revision Notes and Key Points

CBSE class-11 Key points and summary of the lessons is given under this section for Chemistry, Physics, Mathematics, Biology, Accountancy, Business studies, Economics and other subjects. The notes includes all concepts given in NCERT books and syllabus issued by CBSE for class-11. Key notes are 'to the point' capsules for quick revision of the chapter. We have covered the whole syllabus in these notes.

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