Padikam lessons

ORIGINAL STUDY COMPANION PADIKAM CLASS 11 | SCIENCE / ELECTIVE Computer Science CBSE / NCERT core lessons | Academic year 2026-27 11 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 Encoding Schemes and Number System 03 Emerging Trends 04 Introduction to Problem Solving 05 Getting Started with Python 06 Flow of Control 07 Functions 08 Strings 09 Lists 10 Tuples and Dictionaries 11 Societal Impacts 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/Computer_Science_SecP2_2026-27.pdf
2. https://ncert.nic.in/textbook.php?kecs1=0-11
3. https://cbseacademic.nic.in/new-resources-srsec.html PADIKAM | CBSE NCERT CLASS 11 2

CHAPTER 01 Computer System Quick understanding Understand hardware, software, CPU, memory, input-output and operating-system roles as one coordinated system. Core points Check your learning The CPU follows an instruction cycle using registers Draw a functional computer-system and memory. diagram. Primary memory is fast and directly accessible; Compare RAM, ROM, cache and secondary storage is persistent. secondary storage. System and application software solve different levels of need. One-line recall The CPU follows an instruction cycle using registers and memory. PADIKAM | CBSE NCERT CLASS 11 3

CHAPTER 02 Encoding Schemes and Number System Quick understanding Represent numbers, characters and instructions as binary patterns and convert among common bases. Core points Check your learning A bit has two states; groups of bits encode larger Convert numbers among binary, octal, values. decimal and hexadecimal. Place value changes with base. Explain why Unicode is needed. ASCII, ISCII and Unicode solve character-encoding needs at different scales. Equation and notation 1 byte = 8 bits Positional value = digit × base^position SYMBOLS AND UNITS bit: binary digit 0 or 1 base: number of symbols in the numeral system position: place counted from the radix point One-line recall A bit has two states; groups of bits encode larger values. PADIKAM | CBSE NCERT CLASS 11 4

CHAPTER 03 Emerging Trends Quick understanding Recognise how AI, IoT, cloud systems, big data, robotics and immersive technologies combine computing with real-world tasks. Core points Check your learning AI infers patterns; it does not guarantee truth or Match a technology to a real problem. fairness. Evaluate benefits, risks and data needs IoT links sensors, networks and services. of a smart system. Cloud services trade local ownership for scalable shared resources. One-line recall AI infers patterns; it does not guarantee truth or fairness. PADIKAM | CBSE NCERT CLASS 11 5

CHAPTER 04 Introduction to Problem Solving Quick understanding Move from a clearly defined problem to an algorithm, representation, implementation, test and refinement. Core points Check your learning Decomposition reduces a complex task into Write pseudocode for a daily-life manageable parts. process. Pseudocode and flowcharts express logic Design test cases for a number- independently of syntax. classification program. Test cases should include normal, boundary and invalid inputs. One-line recall Decomposition reduces a complex task into manageable parts. PADIKAM | CBSE NCERT CLASS 11 6

CHAPTER 05 Getting Started with Python Quick understanding Use Python syntax, tokens, variables, data types, operators, expressions, conversion and console input-output. Core points Check your learning Interactive mode explores statements; script mode Predict values and types of expressions. stores programs. Write an input-process-output program. Names reference values whose type controls valid operations. Syntax, runtime and logical errors need different debugging strategies. Code pattern name = input("Name: ") age = int(input("Age: ")) print(name, age) One-line recall Interactive mode explores statements; script mode stores programs. PADIKAM | CBSE NCERT CLASS 11 7

CHAPTER 06 Flow of Control Quick understanding Direct program execution through conditions, loops, range, nesting, break and continue. Core points Check your learning if/elif/else chooses among alternatives. Trace a nested conditional and loop. for usually traverses a sequence; while repeats while Write a program for a series, pattern or a condition remains true. validation task. A loop needs correct initialisation, progress and termination. Code pattern for n in range(1, 6): print(n * n) while value < 0: value = int(input("Non-negative: ")) One-line recall if/elif/else chooses among alternatives. PADIKAM | CBSE NCERT CLASS 11 8

CHAPTER 07 Functions Quick understanding Package a reusable operation with parameters, local variables and a returned result. Core points Check your learning A function name should describe one responsibility. Write and call a function with two parameters. Arguments provide input; return sends a result back. Trace local and global names in a short Local scope reduces accidental interference program. between parts of a program. Code pattern def area(length, width): return length * width result = area(8, 5) One-line recall A function name should describe one responsibility. PADIKAM | CBSE NCERT CLASS 11 9

CHAPTER 08 Strings Quick understanding Treat text as an immutable sequence and use indexing, slicing, traversal and methods. Core points Check your learning Indices begin at zero and negative indices count Trace five slicing expressions. from the end. Write a palindrome or character- String methods return new values rather than frequency program. changing the original string. Split and join connect strings with lists of text parts. Code pattern word = "Padikam" print(word[1:5]) parts = sentence.split() One-line recall Indices begin at zero and negative indices count from the end. PADIKAM | CBSE NCERT CLASS 11 10

CHAPTER 09 Lists Quick understanding Store an ordered mutable collection and manipulate it through indices, slices, methods and loops. Core points Check your learning Mutation can change a list object in place. Distinguish append, extend and insert. append adds one item; extend adds items from an Write linear search and summary- iterable. statistic programs. Nested lists represent table-like structures. Code pattern marks.append(92) for value in marks: total += value One-line recall Mutation can change a list object in place. PADIKAM | CBSE NCERT CLASS 11 11

CHAPTER 10 Tuples and Dictionaries Quick understanding Choose tuples for fixed ordered records and dictionaries for mutable key-value associations. Core points Check your learning Tuple elements are ordered but the tuple cannot be Build and query a student dictionary. changed in place. Compare list, tuple and dictionary use Dictionary keys are unique and map to values. cases. Membership on a dictionary tests keys by default. Code pattern student = {"name": "Asha", "mark": 88} for key, value in student.items(): print(key, value) One-line recall Tuple elements are ordered but the tuple cannot be changed in place. PADIKAM | CBSE NCERT CLASS 11 12

CHAPTER 11 Societal Impacts Quick understanding Use technology lawfully, safely, inclusively and sustainably. Core points Check your learning Digital footprints can persist beyond the original Analyse a plagiarism or phishing case. context. Create an inclusive cyber-safety Copyright, patents, trademarks and open licences checklist. protect different interests. Cyber safety, accessible design and e-waste management are shared responsibilities. One-line recall Digital footprints can persist beyond the original context. PADIKAM | CBSE NCERT CLASS 11 13