Padikam lessons

ORIGINAL STUDY COMPANION PADIKAM CLASS 11 | SCIENCE Computer Science 2026 Kerala SCERT / prescribed NCERT core lessons 13 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 | KERALA CLASS 11 1

Contents 01 Introduction to Computing 08 Strings in Python 02 Data Representation and Boolean Algebra 09 Lists 03 Computer System Organisation 10 Tuples 04 Getting Started with Python 11 Dictionaries and Sets 05 Python Fundamentals 12 Sorting and Searching 06 Control Statements 13 Computers and Society 07 Functions and Modules 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://scert.kerala.gov.in/hss-2026/
2. https://drive.google.com/file/d/1D9jvaviFxlMgZWahPjZAJEeU3gXvm1ER/view PADIKAM | KERALA CLASS 11 2

CHAPTER 01 Introduction to Computing Quick understanding Trace computing from counting devices to intelligent networked systems and distinguish major uses. Core points Check your learning Generations are classified by enabling technology. Build a generation-technology timeline. Stored-program architecture keeps data and Explain why an algorithm is required instructions in memory. before programming. Computers support data processing, problem solving, communication and intelligent decisions. One-line recall Generations are classified by enabling technology. PADIKAM | KERALA CLASS 11 3

CHAPTER 02 Data Representation and Boolean Algebra Quick understanding Represent numbers, text and logic in binary and simplify digital conditions. Core points Check your learning Place value supports conversion between number Convert between binary, octal, decimal systems. and hexadecimal. Signed values and character codes need agreed Simplify a Boolean expression and draw encodings. its logic circuit. Boolean laws and truth tables model digital circuits. Equation and notation 1 byte = 8 bits A + A� = 1 A·A� = 0 SYMBOLS AND UNITS bit: binary digit byte: group of 8 bits A: Boolean input, either 0 or 1 Overbar: NOT; +: OR; dot: AND One-line recall Place value supports conversion between number systems. PADIKAM | KERALA CLASS 11 4

CHAPTER 03 Computer System Organisation Quick understanding Connect processor, memory, buses, storage and input-output devices in a functioning system. Core points Check your learning CPU contains ALU, control unit and registers. Label a functional block diagram. Memory hierarchy trades speed, capacity and cost. Compare primary and secondary memory. System buses carry data, address and control signals. One-line recall CPU contains ALU, control unit and registers. PADIKAM | KERALA CLASS 11 5

CHAPTER 04 Getting Started with Python Quick understanding Set up Python, use the interpreter and understand the edit-run-debug cycle. Core points Check your learning Interactive mode tests small statements; script mode Run a first input-output script. stores programs. Classify and correct sample errors. Indentation is part of Python syntax. Errors may be syntax, runtime or logical. Code pattern print("Hello") name = input("Name: ") One-line recall Interactive mode tests small statements; script mode stores programs. PADIKAM | KERALA CLASS 11 6

CHAPTER 05 Python Fundamentals Quick understanding Use values, variables, data types, operators and expressions correctly. Core points Check your learning Assignment binds a name to a value. Predict expression values and types. Type affects valid operations and results. Write a program using input, conversion and formatted output. Operator precedence can be made explicit with parentheses. Code pattern age = int(input("Age: ")) total = price * quantity One-line recall Assignment binds a name to a value. PADIKAM | KERALA CLASS 11 7

CHAPTER 06 Control Statements Quick understanding Direct execution through selection and repetition. Core points Check your learning if/elif/else handles alternatives. Trace a nested conditional. for suits iteration over a sequence; while suits Write a loop for a numerical pattern or condition-controlled repetition. validation task. break and continue change loop flow and should be used deliberately. Code pattern if mark >= 40: print("Pass") for i in range(1, 6): print(i) One-line recall if/elif/else handles alternatives. PADIKAM | KERALA CLASS 11 8

CHAPTER 07 Functions and Modules Quick understanding Divide a program into reusable named units with parameters, return values and imported tools. Core points Check your learning A function should have one clear responsibility. Write and test a function with default arguments. Parameters receive input; return communicates output. Use a standard module in a short program. Modules organise reusable definitions. Code pattern def area(r): return 3.14 * r * r import math One-line recall A function should have one clear responsibility. PADIKAM | KERALA CLASS 11 9

CHAPTER 08 Strings in Python Quick understanding Process text as immutable indexed sequences. Core points Check your learning Indexing selects one character; slicing selects a Count vowels without built-in count. range. Use slicing to test a palindrome. String methods return new values because strings are immutable. Traversal and membership solve many text problems. Code pattern word[0] word[::-1] "py" in word One-line recall Indexing selects one character; slicing selects a range. PADIKAM | KERALA CLASS 11 10

CHAPTER 09 Lists Quick understanding Store and modify ordered collections and use methods, slicing and traversal. Core points Check your learning Lists are mutable and may contain mixed types. Remove duplicates while preserving order. Aliasing and copying are different. Trace mutations through two list Nested lists model tables and matrices. variables. Code pattern items.append(value) copy_items = items.copy() One-line recall Lists are mutable and may contain mixed types. PADIKAM | KERALA CLASS 11 11

CHAPTER 10 Tuples Quick understanding Use immutable ordered collections for fixed records and multiple return values. Core points Check your learning Tuple packing and unpacking simplify assignments. Swap values using tuple unpacking. A one-item tuple needs a comma. Compare tuple and list use cases. Immutability makes accidental modification less likely. Code pattern point = (3, 4) x, y = point One-line recall Tuple packing and unpacking simplify assignments. PADIKAM | KERALA CLASS 11 12

CHAPTER 11 Dictionaries and Sets Quick understanding Model key-value associations and unique unordered collections. Core points Check your learning Dictionary keys must be unique and hashable. Build a frequency dictionary. Sets remove duplicates and support mathematical Use set operations to compare two operations. groups. Membership testing is efficient in dictionaries and sets. Code pattern freq[ch] = freq.get(ch, 0) + 1 common = A & B One-line recall Dictionary keys must be unique and hashable. PADIKAM | KERALA CLASS 11 13

CHAPTER 12 Sorting and Searching Quick understanding Compare algorithms by method, correctness and efficiency. Core points Check your learning Linear search checks sequentially; binary search Trace binary search for a target. requires sorted data. Implement and compare two elementary Sorting algorithms differ in comparisons and swaps. sorts. Tracing reveals invariants and edge cases. Equation and notation Binary search time grows as O(log n) Linear search time grows as O(n) SYMBOLS AND UNITS n: number of data items O(n): growth proportional to n O(log n): logarithmic growth; not a time unit One-line recall Linear search checks sequentially; binary search requires sorted data. PADIKAM | KERALA CLASS 11 14

CHAPTER 13 Computers and Society Quick understanding Evaluate computing through access, privacy, intellectual property, safety and environmental impact. Core points Check your learning Digital citizenship combines rights and Analyse an ethical computing case. responsibilities. Prepare guidelines for responsible digital Personal data needs informed collection and behaviour. protection. FOSS, licensing and accessibility shape participation. One-line recall Digital citizenship combines rights and responsibilities. PADIKAM | KERALA CLASS 11 15