Revised Syllabus of Computer Science Class 12

Revised Syllabus

Computer Science

CLASS-XII

Code No. 083

2020-21

Prerequisites

Computer Science- Class XI

Distribution of Marks:

Unit No.	Unit Name	Theory Marks	Theory Periods	Practical Periods
I	Computational Thinking and Programming – 2	40	50	30
II	Computer Networks	10	10	—
III	Database Management	20	20	10
	Total	70	80	40

Unit I: Computational Thinking and Programming – 2

Revision of the basics of Python covered in Class XI.
Functions: scope, parameter passing, mutable/immutable properties of data objects, passing strings, lists, tuples, dictionaries to functions, default parameters, positional parameters, return values, functions using libraries: mathematical and string functions.
File handling: Need for a data file, Types of file: Text files, Binary files and CSV (Comma separated values) files.
Text File: Basic operations on a text file: Open (filename – absolute or relative path, mode), Close a text file, Reading and Manipulation of data from a text file, Appending data into a text file, standard input / output and error streams, relative and absolute paths.
Binary File: Basic operations on a binary file: Open (filename – absolute or relative path, mode), Close a binary file, Pickle Module – methods load and dump; Read, Write/Create, Search, Append and Update operations in a binary file.
CSV File: Import csv module, functions – Open, Close a csv file, Read from a csv file and Write into a csv file using csv.reader ( ) and csv.writerow( ).
Using Python libraries: Import Python libraries.
Data-structures: Lists as covered in Class XI, Stacks – Push, Pop using a list.

Unit II: Computer Networks

Evolution of Networking: ARPANET, Internet, Interspace Different ways of sending data across the network with reference to switching techniques (Circuit and Packet switching).
Data Communication terminologies: Concept of Channel, Bandwidth (Hz, KHz, MHz) and Data transfer rate (bps, Kbps, Mbps, Gbps, Tbps).
Transmission media: Twisted pair cable, coaxial cable, optical fiber, infrared, radio link, microwave link and satellite link.
Network devices: Modem, RJ45 connector, Ethernet Card, Router, Switch, Gateway, WiFi card.
Network Topologies and types: Bus, Star, Tree, PAN, LAN, WAN, MAN.
Network Protocol: TCP/IP, File Transfer Protocol (FTP), PPP, HTTP, SMTP, POP3, Remote Login (Telnet) and Internet, Wireless / Mobile Communication protocol such as GSM, GPRS and WLL.
Mobile Telecommunication Technologies: 1G, 2G, 3G, 4G and 5G;
Mobile processors;
Electronic mail protocols such as SMTP, POP3, Protocols for Chat and Video Conferencing: VoIP, Wireless technologies such as Wi-Fi and WiMax
Network Security Concepts:
Threats and prevention from Viruses, Worms, Trojan horse, Spams
Use of Cookies, Protection using Firewall, https;
India IT Act, Cyber Law, Cyber Crimes, IPR issues, hacking.
Introduction To Web services: WWW, Hyper Text Markup Language (HTML), Extensible Markup Language (XML); Hyper Text Transfer Protocol (HTTP); Domain Names; URL; Website, Web browser, Web Servers; Web Hosting.

Unit III: Database Management

Database Concepts: Introduction to database concepts and its need.
Relational data model: Concept of domain, relation, tuple, attribute, degree, cardinality, key, primary key, candidate key, alternate key and foreign key;
Structured Query Language:
General Concepts: Advantages of using SQL, Data Definition
Language and Data Manipulation Language;
Data Types: number / decimal, character / varchar / varchar2, date;
SQL commands covered in class XI (2019-20)
SELECT, DISTINCT, FROM, WHERE, IN, BETWEEN, LIKE, NULL /
IS NULL, ORDER BY,GROUP BY, HAVING;
SQL functions: SUM ( ), AVG ( ), COUNT ( ), MAX ( ) and MIN ( );
Joins: equi-join and natural join

Interface of Python with an SQL database