Padikam lessons

ORIGINAL STUDY COMPANION PADIKAM CLASS 11 | COMMERCE / HUMANITIES / ELECTIVE Informatics Practices CBSE / NCERT core lessons | Academic year 2026-27 8 chapter lessons Quick explanations, core points, exam practice and chapter-specific notation in one consistent format. Padikam explanations are independently written. Official textbooks are used as the coverage map, chapter sequence and terminology reference. PADIKAM | CBSE NCERT CLASS 11 1

Contents 01 Computer System 02 Emerging Trends 03 Brief Overview of Python 04 Working with Lists and Dictionaries 05 Understanding Data 06 Introduction to NumPy 07 Database Concepts 08 Introduction to Structured Query Language Study rhythm Read the quick explanation, recall the core points aloud, then answer the prompts without looking back. Use the official textbook links for full prescribed readings, activities and diagrams. Textbook and verification links

1. https://cbseacademic.nic.in/web_material/CurriculumMain27/SecPart2/Informatics_Practices_SecP2_2026-27.pdf
2. https://ncert.nic.in/textbook.php?keip1=0-8
3. https://cbseacademic.nic.in/new-resources-srsec.html PADIKAM | CBSE NCERT CLASS 11 2

CHAPTER 01 Computer System Quick understanding Connect computer components, memory, software and data recovery with reliable everyday use. Core points Check your learning Input, processing, storage and output form a Label a computer-system block diagram. functional cycle. Explain secure disposal and recovery Primary and secondary memory differ in speed, risks. capacity and persistence. Deletion may remove a reference before stored data is overwritten. One-line recall Input, processing, storage and output form a functional cycle. PADIKAM | CBSE NCERT CLASS 11 3

CHAPTER 02 Emerging Trends Quick understanding Survey AI, machine learning, NLP, AR/VR, robotics, big data, IoT, cloud, grid and blockchain technologies. Core points Check your learning Emerging systems often combine sensors, data, Compare SaaS, PaaS and IaaS. networks and models. Design and critique a smart-city use Cloud service models divide responsibility differently. case. A useful evaluation considers purpose, data, risk, cost and inclusion. One-line recall Emerging systems often combine sensors, data, networks and models. PADIKAM | CBSE NCERT CLASS 11 4

CHAPTER 03 Brief Overview of Python Quick understanding Write simple Python programs using variables, operators, expressions, conversion, input-output and debugging. Core points Check your learning Indentation is part of program structure. Predict output and data types. Mutable and immutable types behave differently Write a program for price, discount and under operations. tax. A correct-looking program may still contain a logical error. Code pattern cost = float(input("Cost: ")) discount = cost * rate / 100 print(cost - discount) One-line recall Indentation is part of program structure. PADIKAM | CBSE NCERT CLASS 11 5

CHAPTER 04 Working with Lists and Dictionaries Quick understanding Organise collections with list positions or dictionary keys and use loops and methods to transform them. Core points Check your learning Lists are ordered and mutable. Find largest, smallest and frequency values in a list. Dictionaries model records and mappings. Create a state-capital or student-marks Choose a structure that matches how information will dictionary. be retrieved. Code pattern values.sort() capital[state] = city for name, mark in marks.items(): print(name, mark) One-line recall Lists are ordered and mutable. PADIKAM | CBSE NCERT CLASS 11 6

CHAPTER 05 Understanding Data Quick understanding Recognise data types, quality, organisation and the path from raw values to useful information. Core points Check your learning Context and metadata give values meaning. Classify fields in a sample dataset. Missing, inconsistent and duplicate values reduce Identify data-quality problems and quality. cleaning actions. Collection and analysis should respect privacy and purpose. One-line recall Context and metadata give values meaning. PADIKAM | CBSE NCERT CLASS 11 7

CHAPTER 06 Introduction to NumPy Quick understanding Create one-dimensional arrays and use vectorised operations for compact numerical work. Core points Check your learning A NumPy array normally holds one data type. Create an array from a list and calculate values. Vectorised operations act element by element without an explicit Python loop. Compare an array operation with a list operation. Shape and index rules determine valid access. Code pattern import numpy as np a = np.array([2, 4, 6]) print(a * 3) One-line recall A NumPy array normally holds one data type. PADIKAM | CBSE NCERT CLASS 11 8

CHAPTER 07 Database Concepts Quick understanding Model structured data through relations, attributes, tuples, domains and keys. Core points Check your learning A DBMS supports controlled storage, retrieval and Identify candidate, primary and alternate updating. keys. A primary key uniquely identifies a row. Design a relation for a school or shop. Good design reduces unnecessary duplication and inconsistency. One-line recall A DBMS supports controlled storage, retrieval and updating. PADIKAM | CBSE NCERT CLASS 11 9

CHAPTER 08 Introduction to Structured Query Language Quick understanding Create and modify databases and tables, then retrieve or change rows with clear SQL statements. Core points Check your learning DDL defines structures; DML changes rows; queries Write CREATE TABLE and INSERT retrieve data. statements. WHERE filters rows using conditions. Write SELECT queries using WHERE, BETWEEN and logical operators. NULL represents missing or unknown data and needs IS NULL tests. Code pattern CREATE TABLE Student ( Rno INT PRIMARY KEY, Name VARCHAR(30), Marks INT ); SELECT Name, Marks FROM Student WHERE Marks > 50; One-line recall DDL defines structures; DML changes rows; queries retrieve data. PADIKAM | CBSE NCERT CLASS 11 10