NIOS Class 12 Computer Science 330 Important Questions 2026 (Code 330)

If you are looking for NIOS Class 12 Computer Science 330 important questions for your 2026 board exam, this page has everything you need in one place. All 14 lessons covered in the public exam are included here with sample objective questions carefully chosen based on the latest exam pattern. These questions are from the important questions booklet available at Unnati Education. For complete solved answers and the full question bank, contact us at 9654279279 or 9899436384.

NIOS Class 12 Computer Science (330) Important Questions – Quick Overview

What Are NIOS Class 12 Computer Science 330 Important Questions 2026?

If you open the NIOS Computer Science 330 syllabus, you will find 5 modules covering everything from Basic Computing and Office Automation to Programming in C++, Database, and Web Designing. That is a lot to cover. Most students waste time going through every page of every chapter without knowing what actually comes in the exam.

NIOS Class 12 Computer Science 330 important questions solve exactly this problem. They are a focused collection of objective questions drawn from all important lessons, built specifically around what NIOS actually tests in the board exam. The questions cover Multiple Choice, Fill in the Blanks, True or False, output-based C++ questions, and concept-based questions. These are not random picks. Each one is selected because it has appeared before in NIOS exams or covers a concept that NIOS consistently tests year after year.

Whether you are strong in theory but struggle with C++ output questions, or you understand programming but find networking concepts confusing, this important question bank covers all of it in a chapter-wise, easy-to-follow format.

You can also explore NIOS Class 12 Important Questions for other subjects on our platform to build a well-rounded preparation.

Chapter-Wise Important Objective Questions for NIOS Computer Science (Code 330)

Unit 1 – Basic Computing: Important Questions

Binary Logic – Important Objective Questions

Lesson 2 on Binary Logic is one of the most formula-heavy and concept-heavy lessons in the entire syllabus. Questions on number systems, logic gates, and coding schemes appear every single year.

• The binary number system has a base of: A) 8 B) 10 C) 2 D) 16
  Answer: C
• Binary 1000 equals which decimal number? A) 6 B) 7 C) 8 D) 10
  Answer: C (Calculation: 1 x 2³ + 0 x 2² + 0 x 2¹ + 0 x 2⁰ = 8)
• What is the 2's complement of 11001? A) 00110 B) 00111 C) 01010 D) 01101
  Answer: B (1's complement of 11001 = 00110, then add 1 = 00111)
• The NOR gate performs which combined operation? A) NOT + OR B) NOT + AND C) OR + AND D) AND + OR
  Answer: A
• NAND and NOR are called universal gates because: A) They are the fastest gates B) Any logic circuit can be built using only these two C) They consume less power D) They work on decimal logic
  Answer: B
• The ASCII value of uppercase letter A is: A) 64 B) 65 C) 66 D) 67
  Answer: B

Operating System – Important Objective Questions

Lesson 4 covers the heart of every computer system. OS questions test concepts like process management, types of operating systems, Linux, Android, iOS, and multitasking.

• The Operating System acts as a bridge between: A) Hardware and network B) User and computer hardware C) Hardware and software only D) Monitor and CPU
  Answer: B
• The most critical task of an OS during process management is: A) File allocation B) CPU time allocation C) Device control D) Input buffering
  Answer: B
• Files and folders in Windows are stored using which structure? A) Circular structure B) Linear structure C) Hierarchical structure D) Linked structure
  Answer: C
• The ability of an OS to execute more than one program on a single processor is called: A) Multithreading B) Multiprogramming C) Multiuser system D) Multi-accessing
  Answer: B
• Linux is called open-source software because: A) It runs automatically B) Its source code is freely available for use and modification C) It cannot be changed D) It is closed for public use
  Answer: B

Data Communication and Networking – Important Objective Questions

Lesson 5 is one of the most important lessons for objective questions. Networking concepts, transmission modes, hardware devices, and topologies all generate direct questions.

• Optical fiber transmits data through: A) Electric current B) Sound waves C) Light signals D) Magnetic pulses
  Answer: C
• A modem performs the function of: A) Data encryption B) Digital-to-analog and analog-to-digital conversion C) Address translation D) Packet routing
  Answer: B
• A hub is: A) An intelligent device that decides where to send each packet B) A device that broadcasts data to all connected devices C) A device that filters and forwards data intelligently D) A device used for fiber connections only
  Answer: B
• The tree topology is also known as: A) Circular topology B) Hierarchical topology C) Parallel topology D) Combined topology
  Answer: B

For NIOS Class 12 Intext and Terminal Questions from the networking chapter, Unnati Education provides fully solved material with explanations for every concept.

Communications on Internet – Important Objective Questions

Lesson 6 tests your understanding of how the Internet works, protocols, web browsers, URLs, and email systems.

• Internet can best be described as: A) A single computer network B) A network of interconnected smaller networks C) A local area network D) A wireless broadcast system
  Answer: B
• ARPANET was created by: A) NASA B) Department of Defence, USA C) National Science Foundation D) IBM
  Answer: B
• The first page of any website is called its: A) Main Page B) Home Page C) Web Window D) Index Page
  Answer: B

Unit 2 – Office Automation: Important Questions

Digital Documentation – Important Objective Questions

Lesson 8 covers word processing using OpenOffice Writer. The questions test basic formatting, spell check, mail merge, and document features.

• A word processor is best defined as: A) A hardware device used to print documents B) An application software used to create, edit, and format text documents C) A database program for storing textual data D) A web browser for online documentation
  Answer: B
• Mail merge is used to: A) Send one document to one person B) Send a single document template to multiple recipients C) Merge two files into one D) Print without saving
  Answer: B

Spreadsheets – Important Objective Questions

Lesson 9 on Spreadsheets tests knowledge of LibreOffice Calc, formulas, functions, charts, sorting, and filtering.

• The default extension of a Calc spreadsheet file is: A) .xls B) .xlsx C) .ods D) .doc
  Answer: C
• In a cell reference like $A$1, the dollar sign indicates: A) A text entry B) Absolute reference C) Circular reference D) Range reference
  Answer: B
• The function used to count only numeric entries in a range is: A) COUNTA() B) COUNTIF() C) COUNT() D) SUM()
  Answer: C
• Filtering data in Calc means: A) Erasing records permanently B) Temporarily hiding rows that do not meet conditions C) Rearranging data by columns D) Copying selected data to another sheet
  Answer: B
• The correct syntax for using SUM function is:
  Answer: =SUM(A1:A5)

Digital Presentation – Important Objective Questions

Lesson 10 on Digital Presentation tests Impress features, animations, transitions, and slide management.

• Which feature applies common formatting to all slides? A) Task Pane B) Master Slide C) Navigator D) Slide Sorter
  Answer: B
• The Impress file is saved with extension: A) .ods B) .odp C) .odt D) .odb
  Answer: B
• Which key starts the slide show from the first slide? A) F3 B) F5 C) F7 D) F9
  Answer: B

Unit 3 – Programming in C++: Important Questions

Control Statements – Important Objective and Output-Based Questions

Lesson 14 is heavily tested. Control flow questions and output-based questions from this lesson are a staple of every NIOS Computer Science exam.

• The do-while loop is an example of: A) Entry-controlled loop B) Exit-controlled loop C) Infinite loop D) Nested loop
  Answer: B (The condition is checked after the body executes)
• Which statement skips the remaining statements in the current loop iteration? A) break B) exit() C) return D) continue
  Answer: D
• The general syntax of a for loop in C++ is: A) for (test; update; init) B) for (init; test; update) C) for (update; test; init) D) for (condition)
  Answer: B
• A switch expression can evaluate only: A) Float and double B) Integer or character constants C) Any datatype D) Boolean expressions
  Answer: B

Functions – Important Objective Questions

Lesson 15 tests your knowledge of user-defined functions, library functions, storage classes, inline functions, function overloading, and default arguments.

• Which keyword is used when a function does not return any value? A) return B) null C) void D) empty
  Answer: C
• In call by reference, any change made inside the called function: A) Affects the original variable B) Affects only local variables C) Causes compilation error D) Is ignored by the compiler
  Answer: A
• Having multiple functions with the same name but different parameter lists is known as: A) Recursion B) Overloading C) Nesting D) Inheritance
  Answer: B
• The function pow(2, 3) will return:
  Answer: 8 (2³ = 8)

Array – Important Objective Questions

Lesson 16 tests array declaration, initialization, indexing, and traversal.

• Which statement correctly declares an integer array of size 10? A) int A; B) int A(10); C) int A[10]; D) int [10]A;
  Answer: C
• What is the index of the first element of any array? A) 1 B) 0 C) -1 D) Depends on the compiler
  Answer: B

Structure, Typedef and Enumerated Data Type – Important Questions

Lesson 17 covers user-defined data types including structures, typedef, and enumerations.

• A structure in C++ is best defined as: A) A keyword used to define constants B) A data type that can hold multiple variables of the same type C) A user-defined data type that groups variables of different data types D) A built-in composite data type
  Answer: C
• Which operator is used to access members of a structure variable? A) : B) -> C) . D) ::
  Answer: C

Classes and Objects with Constructors/Destructors – Important Questions

Lesson 18 is critical for understanding Object-Oriented Programming. Questions on class, object, constructor, and destructor appear regularly.

• A class in C++ is best described as: A) A predefined library type B) A user-defined data type that binds data and functions together C) A pointer variable D) A template function
  Answer: B
• By default, members of a class are declared as: A) Public B) Private C) Protected D) Global
  Answer: B
• A constructor in C++ is a special function that: A) Returns the object after creation B) Automatically executes when an object is created C) Destroys an object D) Returns an integer value
  Answer: B

Inheritance – Extending Classes – Important Objective Questions

Lesson 19 tests single, multiple, and multilevel inheritance, and the use of access specifiers.

• Which feature allows a new class to use the properties of an existing class? A) Encapsulation B) Inheritance C) Polymorphism D) Data hiding
  Answer: B
• The main purpose of using inheritance is: A) Increasing execution speed B) Reducing program size C) Code reusability D) Reducing input/output operations
  Answer: C
• In the declaration class Derived : public Base { };, which class is the base class? A) Derived B) Base C) Both D) None
  Answer: B

Pointer – Important Objective and Concept Questions

Lesson 20 on Pointers is one of the most feared but most predictable topics for objective questions.

• Which operator is used to obtain the address of a variable? A) * B) & C) -> D) %
  Answer: B
• Which declaration defines a pointer to an integer? A) int p; B) int p; C) int &p; D) int p;
  Answer: B
• The dereference operator * in pointers is used to: A) Return variable name B) Return address C) Access the value stored at that address D) Initialize the pointer
  Answer: C

Files – Important Objective Questions

Lesson 21 on File Handling tests file classes, opening modes, and reading/writing operations.

• Which header file is essential for performing file operations in C++? A) iostream.h B) fstream.h C) stdio.h D) conio.h
  Answer: B
• Which class is used for writing data into a file? A) ifstream B) ofstream C) fstream D) iostream
  Answer: B
• Which class is used to read data from a file? A) ifstream B) ofstream C) fstream D) iostream
  Answer: A

Unit 4 – Database Concepts and Web Designing: Important Questions

Database Management System – Important Objective Questions

Lesson 23 tests DBMS concepts, data models, SQL basics, and advantages of database systems.

• A database is: A) A random collection of files B) An organized collection of related data C) Temporary memory D) An output device
  Answer: B
• The main purpose of a DBMS is: A) To print data B) To manage hardware C) To control, organize, and share data D) To delete old files
  Answer: C
• Which is a major problem in manual record keeping? A) Data redundancy B) Data sharing C) Data integrity D) Central control
  Answer: A

Web Designing using HTML – Important Objective Questions

Lesson 24 tests basic HTML structure, tags, attributes, and their functions.

• HTML is primarily used to: A) Program computer logic B) Design structured web documents C) Compile code into executables D) Store data permanently
  Answer: B
• Which pair of tags marks the start and end of an HTML document? A) BODY ... BODY B) HEAD ... HEAD C) HTML ... HTML D) PAGE ... PAGE
  Answer: C
• The content that appears visibly on the webpage is placed inside: A) HEAD B) BODY C) TITLE D) HTML
  Answer: B

Inserting Images and Lists in a Web Page – Important Objective Questions

Lesson 25 tests the IMG tag, list tags, image attributes, and supported formats.

• Which image format is most suitable for photographs with many colors? A) GIF B) PNG C) JPG D) BMP
  Answer: C
• Which image format supports transparency without losing image quality? A) GIF B) BMP C) PNG D) JPG
  Answer: C
• The IMG tag in HTML is used to: A) Insert text B) Insert hyperlinks C) Insert images D) Insert tables
  Answer: C

Most Repeated Objective Questions in NIOS Computer Science Exams

Based on analysis of multiple years of NIOS Computer Science 330 question papers, these are the topics that generate the most repeated questions. Do not skip any of these.

Binary conversions such as decimal to binary, binary to decimal, and finding 1's and 2's complement ASCII values, ISCII, and Unicode concepts Logic gates and their truth tables including AND, OR, NOT, NAND, NOR Operating system concepts including multitasking, multiprogramming, and types of OS Networking devices such as hub, switch, bridge, router, and modem Types of network topology: bus, star, ring, tree C++ control statements especially for loop, while, do-while, break, continue Function overloading, default arguments, inline functions Array declaration, indexing, and initialization Class and object concepts, constructors and destructors Inheritance types and access specifiers Pointer operators, declaration, and dereferencing File handling classes: ifstream, ofstream, fstream HTML basic tags and their attributes Spreadsheet formulas, functions, cell referencing, sorting, and filtering

Important Output-Based Questions from C++

Output questions are a scoring area that many students avoid. They usually come from control statements, functions, arrays, or classes. Practice reading code and predicting what will print without running it. A common type looks like this: given a for loop that runs from i = 1 to i less than or equal to 5 and prints i x i, what will be the output? The answer is 1, 4, 9, 16, 25 on separate lines. Train yourself to trace code mentally.

Important Definitions and Short Answer Questions

For 2 to 3 mark questions, you should be able to clearly define:

A database as an organized collection of related data that can be accessed, managed, and updated easily A pointer as a variable that stores the memory address of another variable A constructor as a special member function that executes automatically when an object is created Inheritance as the ability of a derived class to use properties and behaviors of a base class HTML as Hyper Text Markup Language, used to create and structure web pages

Important Programming Concept Questions

These questions test your understanding of how programming concepts work rather than just their definitions. Be ready for questions on why void is used, how call by reference differs from call by value (in call by reference changes affect the original variable, in call by value they do not), and when to use a do-while loop instead of a while loop.

Important Internet and Networking Concept Questions

LAN covers a small area like a building while WAN covers a country or the entire world. A modem converts digital signals to analog and back. A firewall protects a network from unauthorized access. These are the kinds of conceptual questions that show up consistently in NIOS exams.

Important Database and HTML Concept Questions

SQL stands for Structured Query Language and is used to interact with relational databases. In HTML, the BODY tag contains all visible content, the HEAD tag contains meta information, and the TITLE tag sets the browser tab text. These simple but important facts generate direct questions.

You can find the complete NIOS Class 12 question paper from past years at Unnati Education to see exactly how these concepts are tested in real exams.

Why Solving Objective-Based Important Questions Improves Scores in Computer Science?

Many students spend all their time on theory and forget that objective questions carry marks too. Practicing these questions helps you revise faster, builds your ability to spot correct answers quickly, and reduces the chance of making silly mistakes on exam day. Output-based C++ questions become easier when you have practiced tracing code regularly. Fill in the Blanks and True or False questions reward students who have revised consistently.

Are These Important Questions Based on the Latest 2026 NIOS Exam Pattern?

Yes, every question in this bank is aligned with the 2026 NIOS Computer Science 330 exam pattern. The selection reflects recent paper trends, official NIOS guidelines, and the actual chapter weightage. The important questions booklet available from Unnati Education is updated every year to stay current with any changes NIOS makes to the question format.

Do These Important Questions Include Programming, Output-Based, and Concept Questions?

Absolutely. This question bank covers every type of question that appears in the NIOS Computer Science exam. From straightforward MCQs to output-based C++ questions and concept-based short answer questions, all formats are included. The full booklet from Unnati Education includes complete solutions and detailed explanations for every question.

Common Mistakes Students Make While Preparing Computer Science 330

Skipping Binary Logic thinking it is too mathematical Not practicing C++ output questions and losing easy marks Confusing if stream with o fstream in file handling Ignoring Office Automation lessons like Spreadsheets and Presentation Not memorizing HTML tags properly and mixing up attributes Leaving DBMS for last and then running out of time.

Who Should Use This Important Question Bank?

This question bank is ideal for NIOS Class 12 students appearing in the April or October 2026 board exam, students preparing on their own without classroom guidance, learners who want to revise all chapters in less time, and anyone who wants to maximize their marks in the objective section of the Computer Science paper.

NIOS Class 12 TMA for Computer Science with 100% accurate handwritten and typed solutions is also available from Unnati Education for students who need help with their assignments.

About Unnati Education – NIOS Support Since 2010

Unnati Education has been a trusted NIOS study partner for students across India for many years. They offer solved TMAs, practical files, previous year question papers, important question booklets with full solutions, and both online and offline crash courses. All material is updated to match the latest NIOS guidelines every year. Students trust Unnati Education because the content is accurate, the service is prompt, and the results speak for themselves.

Phone and WhatsApp: 9654279279, 9899436384 Website: unnatieducations.com Location: Vikaspuri, New Delhi

How to Get Complete Answers and Study Material for Computer Science 330

The questions on this page are a sample from the important questions booklet available at Unnati Education. The complete booklet has full chapter-wise objective questions for all 14 lessons with accurate answers, detailed explanations, output-based C++ questions with solutions, and True or False and Fill in the Blanks with full coverage. If you want previous year question papers for NIOS Computer Science, need the full solved question bank, or want to explore more NIOS Class 12 Computer Science important questions across all modules, just reach out to the Unnati Education team. Contact us on WhatsApp at 9654279279 or 9899436384 and get the study material that will actually help you score well.

Frequently Asked Questions

Q1. Are these NIOS Computer Science 330 important questions sufficient for exam preparation?

These questions cover all 14 lessons of the public exam syllabus and include the most frequently tested objective questions. They are a strong starting point for focused preparation. The complete booklet with full solutions, output-based questions, and Fill in the Blanks answers from Unnati Education will make your preparation even more complete and thorough.

Q2. Where can I get NIOS Computer Science 330 important questions PDF with answers?

Unnati Education provides the complete solved important question booklet for Computer Science 330 in downloadable and printable formats. It includes chapter-wise MCQs, True or False, Fill in the Blanks, and output questions with accurate answers. Contact them on WhatsApp at 9654279279 or 9899436384 to receive your copy quickly.

Q3. Are these questions updated for the 2026 NIOS exam pattern?

Yes, all questions on this page and in the Unnati Education booklet are updated as per the 2026 NIOS Computer Science exam pattern. The selection is based on recent paper trends, official NIOS chapter weightage, and commonly tested concepts. You can be confident that you are studying the most relevant and current material available.

Q4. Which chapters are most important in NIOS Computer Science 330 for objective questions?

Binary Logic, Control Statements, Functions, Arrays, Classes and Objects, Data Communication and Networking, HTML, and DBMS consistently carry the highest number of objective questions. All 14 lessons have important questions, so balanced preparation is still important for maximizing your score.

Q5. Can I download NIOS Computer Science Class 12 important questions chapter-wise?

Yes, Unnati Education provides the complete chapter-wise NIOS Computer Science 330 important questions in downloadable format. The booklet covers all 14 lessons with complete solutions including MCQ explanations, output-based C++ answers, True or False explanations, and Fill in the Blanks answers for the full public exam syllabus.