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अध्याय 2: कंप्यूटर के अंग (Components of a Computer)

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### कक्षा 8 कंप्यूटर — हस्तलिखित नोटबुक शैली में नोट्स आपकी बिहार सरकार की कक्षा 8 की पुस्तक “मैं और मेरा कंप्यूटर” के अगले भाग में अब अध्याय 2 के नोट्स दिए जा रहे हैं। ये नोट्स पुस्तक के पृष्ठों को देखकर तैयार किए गए हैं। ### अध्याय 2: कंप्यूटर के अंग (Components of a Computer) ### 1\. कंप्यूटर के मुख्य भाग कंप्यूटर के कार्य करने के लिए हार्डवेयर और सॉफ्टवेयर दोनों आवश्यक हैं। (क) हार्डवेयर (Hardware): कंप्यूटर के वे भाग जिन्हें हम देख और छू सकते हैं, हार्डवेयर कहलाते हैं। उदाहरण: की-बोर्ड, माउस, मॉनिटर, प्रिंटर, मदरबोर्ड और RAM। (ख) सॉफ्टवेयर (Software): निर्देशों और प्रोग्रामों का समूह, जिसकी सहायता से कंप्यूटर कार्य करता है, सॉफ्टवेयर कहलाता है। उदाहरण: MS Word, MS Excel, MS Paint। ### 2\. कंप्यूटर के चार प्रमुख भाग * इनपुट डिवाइस (Input Device): कंप्यूटर में डेटा और निर्देश डालने के लिए। * आउटपुट डिवाइस (Output Device): कंप्यूटर से प्राप्त परिणाम देखने या सुनने के लिए। * सिस्टम यूनिट (System Unit): इसमें मदरबोर्ड, CPU और अन्य महत्वपूर्ण आंतरिक भाग होते हैं। * मेमोरी या स्टोरेज यून...
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अध्याय 1: कंप्यूटर — एक परिचय

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 अध्याय 1: कंप्यूटर — एक परिचय 1\. कंप्यूटर क्या है? कंप्यूटर एक इलेक्ट्रॉनिक उपकरण (Electronic Device) है, जो दिए गए डेटा (Data) और निर्देशों के आधार पर विभिन्न कार्य करता है तथा डेटा को संसाधित करके उपयोगी जानकारी (Information) प्रदान करता है।  2\. ICT का पूरा नाम ICT = Information, Communication and Technology * Information (सूचना): डेटा का सार्थक रूप में प्रस्तुतिकरण। * Communication (संचार): दो या अधिक व्यक्तियों के बीच बातचीत या सूचना का आदान-प्रदान। * Technology (प्रौद्योगिकी): कार्यों को आसान और कुशल बनाने के लिए तकनीक का उपयोग। ### 3\. दैनिक जीवन में कंप्यूटर के उपयोग शिक्षा (School) ऑनलाइन पढ़ाई, परीक्षा, रिकॉर्ड रखने और शिक्षण में। बैंक (Bank) खातों का रिकॉर्ड, वित्तीय लेन-देन और ATM सेवाओं में। अस्पताल (Hospital) मरीजों के रिकॉर्ड, जाँच और चिकित्सा संबंधी कार्यों में। अन्य क्षेत्र व्यवसाय, यात्रा एवं टिकट, मनोरंजन, संचार, अनुसंधान, कला और खेल। ### 4\. कंप्यूटर की प्रमुख विशेषताएँ * गति (Speed): बहुत तेजी से गणना करता है। * शुद्धता (Accuracy): सही डेटा और निर्देश मि...
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Number Systems in Computing: Binary, Decimal, Octal, and Hexadecimal

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Number Systems in Computing: Binary, Decimal, Octal, and Hexadecimal 1. Introduction In our daily lives, we use the base-10 number system (decimal)—likely because humans evolved with ten fingers to count on. However, digital computers operate on microscopic electronic switches that can only exist in one of two physical states: OFF (no electrical current) or ON (active electrical current). Because computers only understand these two states, they rely on the Binary Number System (0 and 1). To make large binary numbers easier for software developers and computer engineers to read, modern computing also uses Octal (base-8) and Hexadecimal (base-16). Understanding how these number systems work and how to convert between them is essential for studying memory addressing, web colors, and machine-level architecture. 2. Visual Sketchnote: Number Systems at a Glance  ╔══════════════════════════════════════════════════════════════════════════════╗  ║ NUMBER SYSTEMS SKETC...
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Class 8 Computer Notes (Bihar Board 2025-26)

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Class 8 Computer Notes (Bihar Board 2025-26) Based on "Main Aur Mera Computer" (Me and My Computer) --- Chapter 1: Computer – An Introduction 1. What is a Computer? · The word "Computer" comes from the English word "Compute", which means "to Calculate". · In Hindi, it is called "Sanganak". · Definition: A computer is an Electronic Device that works on the given Data and Instructions and displays the result as Information. 2. Difference Between Data and Information Data Information Data is a collection of numbers, characters, pictures, and facts. The meaningful result obtained after processing data is called Information. It can be unorganized. It is organized and meaningful. Example: Numbers, names, pictures. Example: Result, report, marksheet. 3. ICT (Information and Communication Technology) · ICT = Information + Communication + Technology · Information: Meaningful presentation of data. · Communication: Exchange of information between ...
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Computer Logic Gates: The Building Blocks of Digital Circuits

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Computer Logic Gates: The Building Blocks of Digital Circuits 1. Introduction In our previous guides, we explored software concepts like Python variables, web development, and algorithms. But how does physical hardware actually process calculations at the electronic level? Deep inside every central processing unit (CPU), RAM chip, and motherboard are billions of microscopic electronic switches called transistors. These transistors turn electrical current on and off, representing binary 1 (high voltage) and 0 (low voltage). To turn raw electricity into meaningful decisions, transistors are combined into Logic Gates. A logic gate is a basic building block of a digital circuit that takes one or more binary inputs and produces a single binary output based on a specific logical rule. 2. Visual Sketchnote: Fundamental Logic Gates at a Glance  ╔══════════════════════════════════════════════════════════════════════════════╗  ║ LOGIC GATES SKETCHNOTE / QUICK MAP ...
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Python Programming Basics: Variables, Data Types, and Your First Script

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Python Programming Basics: Variables, Data Types, and Your First Script 1. Introduction In our previous guide, we explored how algorithms and flowcharts help design step-by-step logic. The next natural step is translating that logic into a real programming language that a computer can execute. Among the hundreds of programming languages used worldwide, Python is one of the most popular and student-friendly. Created by Guido van Rossum and released in 1991, Python emphasizes readability and simplicity. Its syntax looks very close to standard English, making it the ideal starting language for school students and ICT labs. From building websites and automating routine tasks to artificial intelligence and data analysis, Python powers modern technology across the globe. 2. Why Learn Python?  * Simple and Readable Syntax: Programs require fewer lines of code compared to older languages like C++ or Java.  * Interpreted Language: Python runs line by line using an interpreter, which ma...
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Algorithms and Flowcharts: The Blueprint of Computer Programming

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Algorithms and Flowcharts: The Blueprint of Computer Programming 1. Introduction Before an architect constructs a building, they draw a detailed blueprint. Similarly, before a software engineer or student writes a single line of code in Python, C, or Java, they must design the logic behind the solution. At its core, a computer does not "think"—it strictly follows structured instructions. If the logic given to it is flawed, the program will fail. To plan and organize logical problem-solving, computer scientists rely on two foundational tools: Algorithms (step-by-step written logic) and Flowcharts (visual diagrammatic representations). Mastering these concepts is the first essential step toward computer programming and computational thinking. 2. What is an Algorithm? An Algorithm is a finite sequence of well-defined, step-by-step instructions designed to solve a specific problem or perform a calculation. Characteristics of a Good Algorithm:  * Clear and Unambiguous: Every step ...
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Cloud Computing & Data Storage: How the Digital Cloud Really Works

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C loud Computing & Data Storage: How the Digital Cloud Really Works 1. Introduction Whenever you stream an educational video, check online exam results, save notes in Google Drive, or send an email from a school computer, you are interacting directly with Cloud Computing. Many beginners imagine the "cloud" as an invisible, floating space in the sky. In reality, the cloud consists of massive networks of high-performance physical servers housed inside secure data centers worldwide, interconnected by high-speed fiber-optic cables. Understanding how cloud systems work helps students appreciate how software applications, school records, and online learning platforms stay accessible 24/7 from any device. 2. What is Cloud Computing? Cloud Computing is the on-demand delivery of computing services—including data storage, servers, databases, networking, and software—over the internet ("the cloud"). Instead of buying, owning, and physically maintaining your own local hard ...
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Database Fundamentals: Understanding Relational Databases, Tables, and SQL

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Database Fundamentals: Understanding Relational Databases, Tables, and SQL 1. Introduction Whether you are checking exam results on a state board portal, looking up a train timetable, or maintaining student attendance registers in an ICT lab, data is at the center of the application. A Database is an organized collection of structured data stored electronically in a computer system. Unlike a plain text file or an isolated spreadsheet, a database management system allows multiple users to search, retrieve, update, and secure vast amounts of data simultaneously without duplication or errors. 2. What is a DBMS and RDBMS? DBMS (Database Management System): System software used to create, maintain, and manage databases. Provides an interface between the end user or software applications and the physical underlying storage. RDBMS (Relational Database Management System): The most widely used database model in enterprise software and school record management. Stores data in struc...
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Web Development Essentials: Understanding HTML, CSS, and JavaScript

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Web Development Essentials: Understanding HTML, CSS, and JavaScript 1. Introduction Every website you visit—from search engines and online encyclopedias to school portals—is built using core web technologies. When your web browser requests a page, it downloads structured code files and translates them into the visual, interactive interface you see on screen. To build modern websites, web developers use three foundational languages: HTML, CSS, and JavaScript. Together, they form the building blocks of the World Wide Web. 2. The Three Pillars of Web Development A helpful way to understand how these technologies collaborate is through the analogy of building a house or a human body: +--------------------------------------------------------------+ | HTML | The Skeleton | Structure, content, elements | | CSS | The Skin/Paint | Styling, layout, colors, fonts| | JavaScript | The Muscles | Interactivity, logic, events | +--------------------------------------------------...
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