CBSE - Class 12 - Computer Science - User Submitted Papers

User Submitted Papers for Class 12 Computer Science

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CBSE User Submitted Papers Class 12 Computer Science

CBSE User Submitted Papers Class 12 Computer Science

CBSE Computer Science model question paper

CBSE User Submitted Papers for class 12 Computer Science and User Submitted Papers & Solutions of 10+2 Computer Science are made available by CBSE every year just after the board exams are over. CBSE marking scheme and blue print is provided along with the User Submitted Papers. This helps students find answer the most frequently asked question, How to prepare for CBSE board exams. The best way to prepare for board exams is to understand the questions pattern and practice them as given in User Submitted Papers.

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Board User Submitted Papers of class 12 Computer Science

CBSE class 12 Board Submitted Papers for Computer Science for the year 2018, 2017, 2016, 2015 with solutions in PDF format for free download. The User Submitted Papers last 10 year for all – NCERT books and based on CBSE latest syllabus must be downloaded and practiced by students. These old 5 to 10 year board User Submitted Papers are the best source to understand question paper pattern and chapter wise weightage in class 12th Computer Science question paper.

Chapter-wise Marks distribution for class 12 Computer Science board exam

Class XII (Theory) – Python

Duration: 3 Hours (Total Marks: 70)

Unit No.

Unit Name



Object Oriented Programming with Python



Advances Programming with Python



Database Management System and SQL



Boolean Algebra



Communicational Technologies




Unit 1: Object Oriented Programming with Python  (50 theory + 40 practical) periods

REVIEW: Python covered In Class-XI
Concept of Object Oriented Programming: Data Hiding, Data Encapsulation, Class and Object, Polymorphism, inheritance, advantages of Object Oriented Programming over earlier programming methodologies,
Classes: Defining classes (attributes, methods), creating instance objects, accessing attributes and methods, using built in class attributes (dict, doc, name, module, bases), Constructor( _ _init()_ _, _ _del()_ _ and _ _ str()_ _) methods in a class, private attributes (limited support), importance of “self” (acts as a pointer to current calling object) operator overloading with methods.
Concept of base class and derived class
: Single, multilevel and multiple inheritance- Overriding methods, using super( ) in derived class to invoke _ _init()_ _ or overridden methods of parent class.

Unit 2: Advance Programming with Python (42 Theory + 36 Practical) Periods

Linear List Manipulation: Sequential allocation, traversal,insertion of an element in a sorted list, deletion of an element from the list, searching (linear, binary), sorting (insertion, selection, bubble).
Stacks (List Implementation): Introduction to stack (LIFO Operations ), operations on stack (PUSH and POP ) and its implementation in python.
Converting expression from infix to postfix notation and evaluation of postfix expression.
Queues (List implementation) – Introduction to Queue(FIFO) , Operations on Queue (INSERT and DELETE) and its implementation in Python.

Data File
Need for non bold for data file, types of data file–text and binary,
opening and closing filesopen( ), close( ), access modes (output, input, default), file object, access_modes, reading and writing a file Read(), readline(), readlines(), write(), writeliness file positions (seek(), tell()), renaming and deleting a file.,flush();
Implementation of basic file operations on text and binary file in Python: Creating/writing data into file, reading and displaying data from file, searching for particular data from a file, insertion and deletion of data from an already existing file, modification of data in file.
Error and Exceptions – NameError, IndexError, TypeError, IO Error, ImportError, ValueError, EOFError.
Generator function using Yield.

Unit 3: Databases and SQL (20 Theory + 20 Practical) Periods

Data base Concepts: Introduction to data base concepts and its need.
Relational data model: Concept of domain, tuple, relation, key, primary key, alternate key, candidate key;
Relational algebra : Selection, Projection, Union and Cartesian product;
Structured Query Language:
General Concepts
: Advantages of using SQL, Data Definition Language and Data Manipulation Language;
SQL functions: SUM ( ), AVG ( ), COUNT ( ), MAX ( ) AND MIN ( ); Obtaining results (SELECT query) from 2 tables using equi-join, Cartesian product and Union

Note: Implementation of the above mentioned commands could be done on any SQL supported software on one or two tables.

Unit 4: Boolean Algebra (16 Theory + 0 Practical) Periods

Role of Logical Operations in Computing.
Binary-valued Quantities, Boolean Variable, Boolean Constant and Boolean Operators: AND, OR, NOT; Truth Tables; Closure Property, Commutative Law, Associative Law, Identity law, Inverse Law, Principle of Duality, Idempotent Law, Distributive Law, Absorption Law, Involution Law, DeMorgan's Law and their applications;
Obtaining Sum of Product (SOP) and Product of Sum (POS) form the Truth Table, Reducing Boolean Expression (SOP and POS) to its minimal form, Use of Karnaugh Map for minimization of Boolean expressions (up to 4 variables);
Application of Boolean Logic: Digital electronic circuit design using basic Logic Gates (NOT, AND, OR, NAND, NOR)
Use of Boolean operators (NOT, AND, OR) in SQL SELECT statements
Use of Boolean operators (AND, OR) in search engine queries.

Unit 5: Communication Technologies (16 Theory + 3 Practical) Periods

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, SMTP, POP3 Remote Login (Talent), and Internet Wireless/Mobile Communication protocol such as GSM, CDMA, GPRS, and WLL.
Mobile Telecommunication Technologies : 1G, 2G, 3G and 4G; 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, Web Scripting – Client side (VB Script, Java Script, PHP) and Server side (ASP, JSP, PHP), Web 2.0 (for social networking)

E-commerce payment transactions using online banking, mobile banking and payment apps and services.

Class XII (Theory) – C++

Duration: 3 hours (Total Marks: 70)

Unit No.

Unit Name



















Unit 1: Object Oriented Programming in C++ (50 Theory + 40 Practical) Periods

REVIEW: C++ covered In Class – XI,

Object Oriented Programming: Concept of Object Oriented Programming – Data hiding, Data encapsulation, Class and Object, Abstract class and Concrete class, Polymorphism (Implementation of polymorphism using Function overloading as an example in C++); Inheritance, Advantages of Object Oriented Programming over earlier programming methodologies,

Implementation of Object Oriented Programming concepts in C++: Definition of a class, Member of a class – Data Members and Member Functions (methods), Using Private and Public visibility modes, default visibility mode (private); Member function definition: inside class definition and outside class definition using scope resolution operator (::); Declaration of objects as instances of a class; accessing members from object (s), Objects as function arguments–pass by value and pass by reference;

Constructor and Destructor: Constructor: special characteristics, declaration and definition of a constructor, default constructor, overloaded constructors, copy constructor, constructor with default arguments;

Destructor: Special Characteristics, declaration and definition of destructor;

Inheritance (Extending Classes): Concept of Inheritances, Base Class, Derived classes, protected visibility mode; Single level inheritance, Multilevel inheritance and Multiple inheritance, Privately derived, publicly derived and Protectedly derived class, accessibility of members from objects and within derived class (es);

Data File Handling: Need for a data file, Types of data files – Text file and Binary file;

Text File: Basic file operations on text file: Creating/Writing text into file, Reading and Manipulation of text from an already existing text File (accessing sequentially).

Binary File: Creation of file, Writing data into file, Searching for required data from file, Appending data to a file, Insertion of data in sorted file, Deletion of data from file, Modification of data in a file;
Implementation of above mentioned data file handling in C++;
Components of C++ to be used with file handling:
Header file: fstream.h; ifstream, ofstream, classes;
Opening a text file in in, out, and app modes;
Using cascading operators (>><<) for writing text to the file and reading text from the file; open (), get (), read () put (), write(), getline() and close() functions; Detecting end-of-file (with or without using eof() function), tellg(), tellp(), seekg().seekp();

Introduction to Pointer,
Declaration and Initialization of Pointer; Dynamic memory allocation/deallocation operators: new, delete; Pointers and Arrays: Array of Pointers, Pointer to an array (1 dimensional array), Function returning a pointer, Reference variables and use of alias; Function call by reference. Pointer to structure: De-reference/Deference operator: *, ->; self referencial structure;

Unit 2: Data Structures (42 Theory + 36 Practical) Periods

Introduction to data structure- array, stack queues primitive and non-primitive data structure, linear and non-linear structure, static and dynamic data structure.

Arrays: One and two Dimensional arrays: Sequential allocation and address calculation;
One dimensional array: Traversal, Searching (Linear, Binary Search), Insertion of an element in an array, deletion of an element from an array, Sorting (Insertion, Selection, Bubble)
Two-dimensional arrays: Traversal Finding sum/difference of two NxM arrays containing numeric values, Interchanging Row and Column elements in a two dimensional array;

Stack (Array and Linked implementation of Stack): Introduction to stack (LIFO_Last in First out Operations)
Operations on stack (PUSH and POP) and its Implementation in C++, Converting expressions from INFIX to POSTFIX notation and evaluation of Postfix expression;

Queue: (Array and Linked Implementation)
Introduction to Queue (FIFO – First in First out operations)
Operations on Queue (Insert and Delete and its Implementation in C++, circular queue using array.

Unit 3: Database Management Systema and SQL

Common to both the options. Refer to unit 3 DATABASE AND SQL mentioned in case of Python for further details.

Unit 4: Boolean Algebra

Common to both the options. Refer to unit 4 mentioned in case of Python for further details.

Unit 5: Networking and Open Source Software

Common to both the options. Refer to unit 5 COMMUNICATION TECHNOLOGIES mentioned in case of Python for further details.

Class 12 Computer Science Questions Papers and syllabus

CBSE class 12 Computer Science have following chapters. Questions are asked from these chapters. CBSE schools are advised to follow NCERT text books. Here is the list of chapters in class 12th Computer Science.

General Instructions:

(i) All Questions are Compulsory.
(ii) Programming Language: Section A : C++.
(iii) Programming Language: Section B: Python.
(iv) Answer either Section A or B, and Section C is compulsory.

Class 12 Computer Science List of Chapters NCERT Book


Chapter 1. Object Oriented Programming with Python

Chapter 2. Advance Programming with Python

Chapter 3. Database Management System and SQL

Chapter 4. Boolean Algebra

Chapter 5. Communicational Technologies


Chapter 1. Object Oriented Programming In C++

Chapter 2. Data Structure

Chapter 3. Database Management System and SQL

Chapter 4. Boolean Algebra

Chapter 5. Communication Technologies

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