ICT & Computer Fundamentals

ICT — Information and Communication Technology वे digital technologies हैं जिनका उपयोग information को collect, store, process, analyse, retrieve, communicate और disseminate करने के लिए किया जाता है।

Key Components:

• Information: Data, knowledge, content
• Communication: Transmission, sharing, networking
• Technology: Hardware, software, networks

Examples of ICT Tools:

• Computers, Smartphones, Internet, Software, Cloud storage, Digital libraries, Learning Management Systems, Social media, Video conferencing

Computer एक electronic device है जो data को input लेता है, process करता है, output देता है और store करता है।

Basic Functions:

• Input: Data entry (keyboard, mouse)
• Processing: Data manipulation (CPU)
• Output: Results display (monitor, printer)
• Storage: Data retention (hard disk, memory)

Generations of Computers:

• 1st Generation (1940s-1950s): Vacuum tubes
• 2nd Generation (1950s-1960s): Transistors
• 3rd Generation (1960s-1970s): Integrated Circuits (ICs)
• 4th Generation (1970s-1980s): Microprocessors
• 5th Generation (1980s-present): AI, parallel processing

• Hardware — हार्डवेयर: Computer के physical components जिन्हें touch किया जा सकता है।
• Software — सॉफ्टवेयर: Programs और instructions का set जो hardware को function कराता है।

Hardware Components:

• CPU (Central Processing Unit): Brain of computer — processes data
• Motherboard: Main circuit board connecting all components
• RAM (Random Access Memory): Temporary memory for running programs
• Hard Disk/SSD: Permanent storage
• Power Supply: Provides power to components

Software Types:

• System Software: Operating systems (Windows, Linux, macOS)
• Application Software: MS Office, browsers, games
• Utility Software: Antivirus, disk cleanup, backup

• Input Devices — इनपुट डिवाइस: Data और instructions को computer में enter करते हैं।

Common Input Devices:

• Keyboard, Mouse, Scanner, Microphone, Webcam, Touchscreen, Barcode reader, Joystick, Digital camera, Trackball

• Output Devices — आउटपुट डिवाइस: Processed data को user को display/print करते हैं।

Common Output Devices:

• Monitor (LCD/LED), Printer (Laser/Inkjet), Speaker, Projector, Plotter, Headphones

• Primary Memory — प्राथमिक मेमोरी: Directly accessible by CPU. Volatile (loses data when power off).

Types:

• RAM (Random Access Memory): Read/Write — temporary
• ROM (Read Only Memory): Read-only — permanent (BIOS)
• Cache Memory: High-speed memory for frequently used data

• Secondary Storage — द्वितीयक भंडारण: Non-volatile — permanent storage.

Types:

• Hard Disk Drive (HDD), Solid State Drive (SSD), CD/DVD, Pen Drive, Memory Card, Cloud Storage

Memory Units (Smallest to Largest):

• Bit → Byte (8 bits) → KB (1024 Bytes) → MB (1024 KB) → GB (1024 MB) → TB (1024 GB) → PB (1024 TB)

• Binary (Base 2): 0, 1 → Used by computers (bits)
• Octal (Base 8): 0-7
• Decimal (Base 10): 0-9 → Used by humans
• Hexadecimal (Base 16): 0-9, A-F

Conversions:

• Binary to Decimal: Multiply each digit by 2ᵖᵒˢⁱᵗⁱᵒⁿ and sum.
• Decimal to Binary: Divide by 2 repeatedly and read remainders.

Example: 1010₂ = 1×2³ + 0×2² + 1×2¹ + 0×2⁰ = 8+0+2+0 = 10₁₀

Operating System (OS) system software है जो hardware और software के बीच interface प्रदान करता है और computer resources को manage करता है।

Functions of OS:

• Memory management
• Process management
• File management
• Device management
• Security and access control
• User interface (GUI/CLI)

Common Operating Systems:

• Windows: Microsoft (most widely used)
• macOS: Apple
• Linux: Open source (Ubuntu, Fedora, Debian)
• Android: Mobile OS (Google)
• iOS: Mobile OS (Apple)

Computer Network interconnected computers का set है जो resources share और communicate करते हैं।

Types of Networks:

• LAN (Local Area Network): Small area (office, building)
• MAN (Metropolitan Area Network): City/area
• WAN (Wide Area Network): Large area (country, world) — Internet is a WAN
• PAN (Personal Area Network): Personal devices (Bluetooth)

Network Topologies:

• Bus, Star, Ring, Mesh, Tree

Network Devices:

• Router: Connects networks
• Switch: Connects devices within a network
• Hub: Broadcasts data to all devices
• Modem: Converts digital to analog (and vice versa)

Internet global network of interconnected computers है जो TCP/IP protocol का उपयोग करता है।

Key Concepts:

• IP Address: Unique identifier for each device (e.g., 192.168.1.1)
• Domain Name: Human-readable address (e.g., google.com)
• DNS (Domain Name System): Translates domain names to IP addresses
• URL (Uniform Resource Locator): Web address

Internet Services:

• World Wide Web (WWW), Email, FTP, VoIP, Video conferencing, Social media

Browsers:

• Google Chrome, Mozilla Firefox, Safari, Microsoft Edge

Cybersecurity digital systems, networks, and data को unauthorised access, attacks, damage से protect करना है।

Common Threats:

• Virus: Malicious code that replicates
• Malware: Malicious software
• Ransomware: Locks files until ransom paid
• Phishing: Fraudulent emails to steal information
• Hacking: Unauthorised access
• Denial of Service (DoS): Overloading a system
• Identity Theft: Stealing personal information

Security Measures:

• Antivirus: Protects against malware
• Firewall: Blocks unauthorised access
• Encryption: Converts data to unreadable format
• Strong Passwords: Complex, unique passwords
• Two-Factor Authentication (2FA): Extra layer of security
• Regular Updates: Patches vulnerabilities
• Backup: Regular data backup

• Trap 1: RAM = permanent storage → ❌ RAM is volatile (temporary).
• Trap 2: ROM = read/write memory → ❌ ROM is read-only.
• Trap 3: 1 KB = 1000 bytes → ❌ 1 KB = 1024 bytes.
• Trap 4: Software = only applications → ❌ Software includes system software (OS) too.
• Trap 5: LAN = large network → ❌ LAN is local; WAN is large.
• Trap 6: Internet = WWW → ❌ WWW is a service on the Internet.
• Trap 7: Router = connects devices within a network → ❌ Router connects networks; Switch connects devices.
• Trap 8: Virus = only harmful program → ❌ Virus is a specific type of malware that replicates.

ICT stands for:

• A. Information and Computer Technology
• B. Information and Communication Technology
• C. Internet and Communication Technology
• D. Integrated Computer Technology

Explanation: ICT = Information and Communication Technology.

Which of the following is an example of system software?

• A. MS Word
• B. Windows 10
• C. Google Chrome
• D. Adobe Photoshop

Explanation: Windows 10 is an operating system (system software). Others are application software.

Which memory is volatile?

• A. ROM
• B. Hard Disk
• C. RAM
• D. CD

Explanation: RAM is volatile — loses data when power is off.

What is the decimal equivalent of binary 1010?

• A. 8
• B. 9
• C. 10
• D. 11

Explanation: 1×2³ + 0×2² + 1×2¹ + 0×2⁰ = 8+0+2+0 = 10.

Which network covers the largest geographical area?

• A. LAN
• B. MAN
• C. WAN
• D. PAN

Explanation: WAN (Wide Area Network) covers the largest area (country/world).

Which of the following is a cybersecurity threat?

• A. Antivirus
• B. Firewall
• C. Phishing
• D. Encryption

Explanation: Phishing is a cyber threat. Antivirus, firewall, and encryption are security measures.

What does DNS stand for?

• A. Digital Network System
• B. Domain Name System
• C. Data Network Service
• D. Dynamic Name Server

Explanation: DNS translates domain names to IP addresses.

Hardware vs Software:

• Hardware = Physical components
• Software = Programs/Instructions
• System Software = OS (Windows, Linux, macOS)
• Application Software = MS Office, Chrome, etc.

Memory:

• Primary: RAM (Volatile), ROM (Non-volatile)
• Secondary: HDD, SSD, Pen Drive, Cloud
• Units: Bit → Byte → KB → MB → GB → TB → PB

Number Systems:

• Binary (Base 2): 0, 1
• Decimal (Base 10): 0-9
• Hexadecimal (Base 16): 0-9, A-F

Networks:

• LAN (Local), MAN (Metropolitan), WAN (Wide)
• Devices: Router, Switch, Hub, Modem

Security:

• Threats: Virus, Malware, Phishing, Ransomware
• Measures: Antivirus, Firewall, Encryption, 2FA

Exam Formula:

UGC NET में ICT & Computer Fundamentals के questions definitions, concepts, identification, और application पर based होते हैं।