Computer Science CLASS-XI -Syllabus With Notes
Unit I: Computer Systems and Organisation
● Basic Computer Organization: Introduction to computer system, hardware, software, input device,
output device, CPU, memory (primary, cache and secondary), units of memory (Bit, Byte, KB, MB,
GB, TB, PB)
● Types of software: system software (operating systems, system utilities, device drivers),
programming tools and language translators (assembler, compiler & interpreter), application
● Operating system (OS): functions of operating system, OS user interface
● Boolean logic: NOT, AND, OR, NAND, NOR, XOR, truth table, De Morgan’s laws and logic circuits
● Number system: Binary, Octal, Decimal and Hexadecimal number system; conversion between
● Encoding schemes: ASCII, ISCII and UNICODE (UTF8, UTF32)
● Emerging trends: Cloud computing, cloud services (SaaS, IaaS, PaaS), blockchains, Artificial
Intelligence (AI), Machine Learning (ML), Internet of Things (IoT)
Unit II: Computational Thinking and Programming –
● Introduction to problem solving: Steps for problem solving (analyzing the problem, developing an algorithm, coding, testing and debugging). representation of algorithms using flow chart and pseudo code, decomposition
● Familiarization with the basics of Python programming: Introduction to Python, features of Python, executing a simple “hello world” program, execution modes: interactive mode and script mode, Python character set, Python tokens (keyword, identifier, literal, operator, punctuator), variables, concept of l-value and r-value, use of comments
● Knowledge of data types: number (integer, floating point, complex), boolean, sequence (string, list, tuple), none, mapping (dictionary), mutable and immutable data types
● Operators: arithmetic operators, relational operators, logical operators, assignment operator, augmented assignment operators, identity operators (is, is not), membership operators (in, not in)
● Expressions, statement, type conversion & input/output: precedence of operators, expression, evaluation of expression, python statement, type conversion (explicit & implicit conversion), accepting data as input from the console and displaying output
● Errors: syntax errors, logical errors, runtime errors ● Flow of control: introduction, use of indentation, sequential flow, conditional and iterative flow control
● Conditional statements: if, if-else, if-elif-else, flowcharts, simple programs: e.g.: absolute value, sort 3 numbers and divisibility of a number
● Iterative statements: for loop, range function, while loop, flowcharts, break and continue statements, nested loops, suggested programs: generating pattern, summation of series, finding the factorial of a positive number etc
● Strings: introduction, indexing, string operations (concatenation, repetition, membership & slicing), traversing a string using loops, built-in functions: len(), capitalize(), title(), lower(), upper(), count(), find(), index(), endswith(), startswith(), isalnum(), isalpha(), isdigit(), islower(), isupper(), isspace(), lstrip(), rstrip(), strip(), replace(), join(), partition(), split()
● Lists: introduction, indexing, list operations (concatenation, repetition, membership & slicing), traversing a list using loops, built-in functions: len(), list(), append(), extend(), insert(), count(), index(), remove(), pop(), reverse(), sort(), sorted(), min(), max(), sum(); nested lists, suggested programs: 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: introduction, indexing, tuple operations (concatenation, repetition, membership & slicing), built-in functions: len(), tuple(), count(), index(), sorted(), min(), max(), sum(); tuple assignment, nested tuple, suggested programs: 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: introduction, accessing items in a dictionary using keys, mutability of dictionary (adding a new item, modifying an existing item), traversing a dictionary, built-in functions: len(), dict(), keys(), values(), items(), get(), update(), 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
● Sorting techniques: Bubble and Insertion sort
● Introduction to Python modules: Importing module using ‘import ‘ and using from statement, 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
● Digital Footprints
● Digital society and Netizen: net etiquettes, communication etiquettes, social media etiquettes
● Data protection: Intellectual Property Right (copyright, patent, trademark), violation of IPR
(plagiarism, copyright infringement, trademark infringement), open source softwares and
licensing (Creative Commons, GPL and Apache)
● Cyber-crime: definition, hacking, eavesdropping, phishing and fraud emails, ransomware,
preventing cyber crime
● Cyber safety: safely browsing the web, identity protection, confidentiality, cyber trolls and
● Safely accessing web sites: malware, viruses, trojans, adware
● E-waste management: proper disposal of used electronic gadgets
● Indian Information Technology Act (IT Act)
● Technology & Society: Gender and disability issues while teaching and using computers
CSBSE Suggested Practical List
• Input a welcome message and display it.
• Input two numbers and display the larger / smaller number.
• Input three numbers and display the largest / smallest number.
• Generate the following patterns using nested loop.
1 2 3 4 5
1 2 3 4
1 2 3
• Write a program to input the value of x and n and print the sum of the following series:
o x – x2 + x3 – x4 + ………….xn
2 3 4 n
o x + x2- x3+ x4- ………….xn
2! 3! 4! n!
• Determine whether a number is a perfect number, an Armstrong number or a palindrome.
• Input a number and check if the number is a prime or composite number.
• Display the terms of a Fibonacci series.
• Compute the greatest common divisor and least common multiple of two integers.
• Count and display the number of vowels, consonants, uppercase, lowercase characters in string.
• Input a string and determine whether it is a palindrome or not; convert the case of characters in a
• Find the largest/smallest number in a list/tuple
• Input a list of numbers and swap elements at the even location with the elements at the odd
• Input a list of elements, sort in ascending/descending order using Bubble/Insertion sort.
• Input a list/tuple of elements, search for a given element in the list/tuple.
• Input a list of numbers and find the smallest and largest number from the list.
• Create a dictionary with the roll number, name and marks of n students in a class and display the
names of students who have scored marks above 75.