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Computer Science

FOC Master Revision Handbook — RSMSSB BCI

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💻 FOC — मास्टर रिवीज़न हैंडबुक

Fundamentals of Computer | RSMSSB BCI Exam | Error Log + Notes से तैयार | सभी Traps Cover
🚨 14 Personal Traps Fixed 📊 All Difference Tables 🧠 Memory Tricks 🇮🇳 India Firsts 🖨️ Print Ready A4 ⚡ Last-Minute Revision
🚨 मेरी परीक्षा गलतियाँ — सबसे पहले पढ़ो (हर गलती confirm करो)
# TRAP (क्या गलत सोचा) ✅ सही उत्तर याद करने की चाबी
1 ROM/HDD/SSD = Volatile RAM = Volatile (power off → data gone)
ROM/HDD/SSD = Non-Volatile		 RAM = Temporary RAM 🗑️
2 1024 Bytes = 1 GB 1024 Bytes = 1 KB
Bit→Nibble(4b)→Byte(8b)→KB→MB→GB→TB		 KB आता है पहले, GB बहुत बाद में
3 Word, Excel, Photoshop = System Software ये सब Application Software हैं
System = OS, Driver, Compiler, Utility		 System = पर्दे के पीछे, App = User देखता है
4 DTP/Database = System Software DTP (PageMaker, CorelDraw) = Application Software
System = OS, Driver, Utility, Language Translator		 DTP User बनाता है, OS नहीं
5 Laser Printer = Impact Laser = Non-Impact (toner, no strike)
Impact = Dot Matrix, Daisy Wheel, Drum, Chain		 LIT = Laser Inkjet Thermal → सब Non-Impact
6 Plotter = Input Device Plotter = Output Device
CAD drawings, Maps, Engineering diagrams		 Plotter Produces → Output
7 Gmail = Web Browser Gmail = Email Service (Application)
Browser = Chrome, Firefox, Safari, Edge, Opera
KompoZer = HTML Editor (Browser नहीं)		 Gmail browser के अंदर चलता है, खुद नहीं है
8 Computer ON → पहले OS load होता है सही क्रम: BIOS → POST → OS Load
BIOS = ROM का हिस्सा है		 BIOS = Boss (पहले आता है)
9 IT = ICT का बड़ा version ICT बड़ा है → IT उसका subset
ICT = IT + Communication Technology		 ICT ⊃ IT (C = Communication extra है)
10 Fedora, Linux = Antivirus Fedora, Linux = Operating System
Antivirus = Avast, Norton, Kaspersky, McAfee, AVG, NOD32		 Linux → Linus Torvalds → OS
11 Adobe Photoshop = Open Source Adobe = Proprietary ❌ (Paid)
Open Source = Linux, Firefox, LibreOffice, Ubuntu, GIMP, VLC		 Adobe = A Dobe पैसे लो (Paid)
12 GUI में Graphs use होते हैं GUI में Graphs use नहीं होते
GUI = WIMP: Window, Icon, Menu, Pointer
MS-DOS = GUI नहीं, CUI है		 WIMP = W-I-M-P (4 elements)
13 10 surfaces × 5 tracks = 50 Cylinders Cylinders = Tracks per surface = 5
Cylinder = same track number on ALL surfaces		 Cylinder = Column खड़ा, Track count जितना
14 Nibble/Byte = सबसे छोटी unit Bit (0 या 1) = सबसे छोटी unit
Bit → Nibble(4) → Byte(8)		 Bit = Binary digIT = smallest
🗂️ Software वर्गीकरण — Complete Reference
श्रेणी उदाहरण ✅ (इसमें हैं) ❌ इसमें नहीं
System Software Windows, Linux, Unix, Android, iOS, macOS, Device Driver, Compiler, Assembler, Interpreter, Linker, Loader, Utility Software MS Word, Excel, Photoshop, Chrome, DTP, Database Apps
Application Software
(End User Software)		 MS Word, Excel, PowerPoint, Tally, Photoshop, Chrome, Firefox, AutoCAD, PageMaker, VLC, Zoom, Skype, Telegram, WhatsApp OS, Device Driver, Compiler, Antivirus
Utility Software
(System का हिस्सा)		 Antivirus (Avast, Norton, Kaspersky, NOD32), Disk Defragmenter, Disk Cleanup, CCleaner, WinZip, WinRAR, 7-Zip, Backup Tool, Clipboard MS Word, OS itself, Photoshop
Open Source Linux, Ubuntu, Fedora, Firefox, LibreOffice, WordPress, GIMP, OpenOffice, VLC, Python, MySQL, Android Adobe Photoshop ❌, MS Windows ❌, MS Office ❌
Proprietary/Paid MS Windows, MS Office, Adobe Photoshop, Adobe Reader, Oracle (commercial) Linux, Firefox, GIMP
Freeware Free but closed source (source code नहीं मिलता) Open Source से अलग
Shareware Trial period free, फिर pay करना पड़ता है —

Language Translators (System Software)

Translator काम Object File? Error Report Speed Example
Compiler पूरा program एक साथ → Machine code ✅ हाँ (.obj/.exe) सभी errors एक साथ Execution: तेज़ C, C++, Java (bytecode)
Interpreter Line-by-line → Execute करता है ❌ नहीं पहली error पर रुकता है Execution: धीमा Python, JavaScript, BASIC
Assembler Assembly (Mnemonics) → Machine code ✅ हाँ — — Assembly language
⚠️ Java Exception: Java = Compiler (→ Bytecode .class) + JVM Interpreter (→ Machine code) — दोनों एक साथ use करती है
⚠️ Compilation Time vs Execution Time: Compiler का Execution Fast है, लेकिन Compilation (analysis) में ज़्यादा time लगता है। Interpreter का उल्टा।
🧠 Software Trick:
System = पर्दे के पीछे (OS, Driver, Compiler)
App = User के सामने (Word, Chrome)
Utility = DAB: Disk cleanup, Antivirus, Backup
Compiler = Complete + Creates file
Interpreter = Instant Line + Interrupts on error
💡 Linker & Loader:
Linker = Multiple .obj files → एक .exe बनाता है
Loader = .exe को Storage से RAM में load करता है
SPOOLING = Simultaneous Peripheral Operations On-Line (Print Queue)
🖱️ Input / Output Devices — Complete Reference

Input Devices ✅

Device काम / Key Fact
Keyboard Text input। Father: Christopher Latham Sholes
Mouse Pointing। Inventor: Douglas Engelbart (1964)
Scanner Hardcopy → Softcopy। केवल Input
OCR Optical Character Recognition → Editable text
OMR Optical Mark Reader → MCQ sheets (pen/pencil marks)
MICR Magnetic Ink Char Recognition → Bank cheque। Iron Oxide ink
Barcode Reader UPC = 12 digits। Black bars scan
QR Code Scanner Quick Response। 2D। Denso Wave (Japan)
Joystick Games / Robot control। 360° rotate
Light Pen CRT screen drawing। Electro-optical device
Trackball Mouse alternative। Ball rotate करते हैं
Microphone Voice input। Diaphragm use
Webcam Video/Image input। केवल Input
Digitizer Hand drawing → Digital। CAD use
RFID Radio Frequency Identification। Contactless scan

Output Devices ✅

Device काम / Key Fact
Monitor/VDU Soft copy। Father: Karl Ferdinand Braun
Printer Hard copy। Quality = DPI
Plotter CAD/Maps/Engineering। Vector graphics। केवल Output ⚠️
Speaker Audio output
Projector Large screen display

Both I/O (दोनों) ⚠️

Device Input Output
Touch Screen Touch sensor Display screen
Modem Receive data Send data
Fax Machine Scan document Print received
Headset Microphone Speaker
Pen Drive Read data Write/Store data
🧠 T-M-F = Touch Screen, Modem, Fax → सब दोनों I/O
Scanner = केवल Input ❌ Output नहीं
Plotter = केवल Output ❌ Input नहीं

Scanner vs Plotter — Confusion Table

Feature Scanner Plotter
Device Type Input Only Output Only
काम Hardcopy → Digital (Softcopy) Digital → Large Paper (Hardcopy)
Technology Light sensor (CCD/CIS) Pen/mechanical drawing
Use Document digitize CAD, Maps, Engineering blueprints

OCR vs OMR vs MICR vs Barcode vs QR

Device Full Form उपयोग Key Fact
OCR Optical Character Recognition Printed/Handwritten text → Editable Text को editable बनाता है
OMR Optical Mark Reader MCQ answer sheets Pen/pencil marks detect करता है
MICR Magnetic Ink Character Recognition Bank cheque reading Iron Oxide magnetic ink use
Barcode UPC = Universal Product Code Shop product scan 12 digits + black bars। 1D code
QR Code Quick Response Code Payment, links 2D। Small squares grid। Denso Wave Japan
🖨️ Printer — 0 से End तक Complete Reference
प्रिंटर वर्गीकरण का आधार: ① Technology (Impact/Non-Impact) ② Output capacity (Character/Line/Page printer)
Printer Type Capacity Speed Unit Key Facts (Exam Keywords)
Dot Matrix Impact Character/Serial CPS Pin + Ribbon। Carbon copies बना सकता है। Railway ticket, Bank passbook, Electricity bill। सस्ता।
Daisy Wheel Impact Character/Serial CPS पहिए की तरह (flower shape)। केवल Text। ❌ Graphics नहीं।
Drum Printer Impact Line LPM Cylindrical drum घूमता है। पूरी line एक साथ।
Chain Printer Impact Line LPM Steel chain। Line printer।
Band Printer Impact Line LPM Steel band। Line printer।
Inkjet Non-Impact Page PPM Liquid ink। Nozzle spray। CMYK cartridge। Color printing।
Laser Non-Impact Page PPM Dry powder (Toner)। सबसे तेज़। Best quality। Electrostatic drum।
Thermal Non-Impact Page PPM Heat-sensitive paper। No ink/toner। ATM receipt, bus ticket, POS। Print fade होता है।
Plotter Non-Impact (Output Device) Vector/Graphics mm/s Pen से continuous lines। CAD, Maps, Engineering। Vector graphics।
🧠 Memory Tricks:
LIT = Non-Impact: Laser, Inkjet, Thermal
CDB = Line Printers: Chain, Drum, Band
DQ = Daisy Wheel: Daisy = Quality text but NO graphics
DPI = Quality | PPM/LPM/CPS = Speed
💡 CMYK: Cyan, Magenta, Yellow, Key(Black)
DPI = Dots Per Inch = Print Quality measure
PPM = Pages Per Minute (Laser, Inkjet, Thermal)
LPM = Lines Per Minute (Drum, Chain, Band)
CPS = Characters Per Second (Dot Matrix, Daisy Wheel)
Carbon copies = केवल Impact printers से
Feature Impact Printers Non-Impact Printers
Mechanism Physical strike (ribbon + paper) No strike — laser/ink/heat
Noise बहुत आवाज़ (Noisy) शांत (Quiet)
Quality कम बेहतर
Speed धीमा तेज़
Multi-copy ✅ हाँ (carbon copy) ❌ नहीं
Examples Dot Matrix, Daisy Wheel, Drum, Chain Laser, Inkjet, Thermal
🧠 Memory — पूरा Reference (Hierarchy + Units + Types)

Memory Hierarchy (Speed: Fast → Slow)

Register → Cache(L1→L2→L3) → RAM → SSD → HDD → Optical Disk → Magnetic Tape (सबसे धीमा)
🧠 Speed ↑ = Size ↓ = Cost ↑ (ऊपर जाओ — तेज़, छोटा, महँगा)
Speed ↓ = Size ↑ = Cost ↓ (नीचे जाओ — धीमा, बड़ा, सस्ता)
RC-RSS-M: Register → Cache → RAM → SSD → HDD → Magnetic Tape
💡 Locality of Reference: Cache इसी principle पर काम करती है
Temporal = हाल में use हुआ data फिर use होगा
Spatial = पास वाले address का data भी soon use होगा

Memory Types — Complete Table

Memory Type Volatile? Technology Key Facts
Register Primary ✅ हाँ Flip-Flops सबसे तेज़, CPU के अंदर। Accumulator, Program Counter।
Cache (L1/L2/L3) Primary ✅ हाँ SRAM CPU+RAM के बीच buffer। Locality of Reference।
RAM Primary ✅ हाँ DRAM (Capacitor) Working memory। CPU directly access। Power off → data gone।
ROM Primary ❌ नहीं Semiconductor BIOS store करता है। Read Only। Non-Volatile। Exception: Primary but Non-Volatile!
HDD Secondary ❌ नहीं Magnetic (Iron Oxide) Aluminium platter। Speed = RPM। Moving parts।
SSD Secondary ❌ नहीं Flash Memory HDD से तेज़। कोई moving part नहीं। Shock-resistant।
CD-R Secondary ❌ नहीं Optical WORM = Write Once Read Many। ~700MB।
CD-RW Secondary ❌ नहीं Optical Rewritable। बार-बार लिख सकते हैं।
DVD Secondary ❌ नहीं Optical 4.7 GB (single layer)। 8.5 GB (dual layer)।
Blu-ray Secondary ❌ नहीं Optical 25 GB (single)। 50 GB (dual layer)।
Magnetic Tape Secondary ❌ नहीं Magnetic Sequential access। सबसे धीमा। केवल Backup के लिए।
🚨 ROM का Exception: ROM = Primary Memory है लेकिन Non-Volatile है। "All Primary = Volatile" — यह WRONG है।
🚨 CD vs DVD: CD ≈ 700 MB (MB में) | DVD = 4.7 GB (GB में) — units गलत मत करना।

DRAM vs SRAM ⭐⭐ (सबसे ज़्यादा पूछा जाता है)

Feature DRAM (Dynamic RAM) SRAM (Static RAM)
Component Transistor + Capacitor Flip-Flops (6 transistors)
Refresh ✅ ज़रूरी (capacitor charge leak होता है) ❌ ज़रूरी नहीं
Speed धीमा तेज़
Cost सस्ता महँगा
Density High (ज़्यादा data in less space) Low (ज़्यादा space लेता है)
Power (चालू रहने पर) कम ज़्यादा
Use Main RAM (Primary Memory) Cache Memory
🧠 C-D-R Rule: Capacitor = DRAM = Refresh (कैपेसिटर leak होता है → रोज़ Refresh)
S-F-C Rule: SRAM = Flip-Flop = Cache
DRAM = Daily Refresh (DRAM को daily नहाना पड़ता है)
⚠️ SRAM 'Static' है → यह Non-Volatile नहीं है — बिजली गई तो data जाएगा! दोनों Volatile हैं।
⚠️ SRAM महँगा लेकिन Density कम। DRAM सस्ता लेकिन Density ज़्यादा।

ROM के प्रकार

ROM Type Full Form Key Feature
PROM Programmable ROM Blank आता है। User एक बार write कर सकता है। Permanent।
EPROM Erasable Programmable ROM UV rays से erase। पूरी chip एक साथ erase।
EEPROM Electrically Erasable Programmable ROM Electric signal से erase। Byte-by-byte erase possible।
Flash Memory — EEPROM का advanced form। SSD, Pen Drive में use।

Memory Units — Formula Sheet ⭐⭐⭐

Bit → Nibble(4b) → Byte(8b) → KB(1024B) → MB(1024KB) → GB(1024MB) → TB(1024GB) → PB → EB → ZB → YB
Unit बराबर Powers of 2 Exam Trick
1 Nibble 4 Bits 2² आधा Byte = Half Byte
1 Byte 8 Bits 2³ 1 Character = 1 Byte
1 KB 1024 Bytes 2¹⁰ छोटी text file
1 MB 1024 KB 2²⁰ एक गाना ≈ 3–5 MB
1 GB 1024 MB 2³⁰ Movie ≈ 1–2 GB
1 TB 1024 GB 2⁴⁰ Hard disk size
1 PB 1024 TB 2⁵⁰ Big Data centers
1 EB 1024 PB 2⁶⁰ Internet data/day
1 ZB 1024 EB 2⁷⁰ —
1 YB 1024 ZB 2⁸⁰ सबसे बड़ा standard unit
🧠 Higher units trick: T-P-E-Z-Y (टॉपर इजी है भाई) = TB → PB → EB → ZB → YB
🕰️ Computer Generations — Matching Table
पीढ़ी वर्ष Core Technology Language Examples Storage
1st 1940–1956 Vacuum Tube Machine Language (0,1) ENIAC, UNIVAC, EDVAC, EDSAC Magnetic Drum, Punch Card
2nd 1956–1963 Transistor Assembly + FORTRAN, COBOL IBM 1401, IBM 7030, IBM 7094 Magnetic Core, Magnetic Tape
3rd 1964–1971 IC (SSI + MSI) High-Level (FORTRAN-IV, COBOL, BASIC) IBM System/360, CDC 6600 Magnetic Core (large)
4th 1971–Present VLSI / Microprocessor C, C++, SQL, GUI-based PC, Laptop, Intel 4004, Apple II Semiconductor RAM/ROM, HDD
5th Present ULSI + AI + Parallel Python, AI/NLP languages PARAM, Deep Blue, IBM Watson, i-series SSD, Cloud, Optical
🧠 Core Tech Trick: V-T-I-V-U
Vacuum → Transistor → IC → VLSI → ULSI
"VT IV U" (वी-टी आई-वी यू)
💡 IC Classification:
SSI < 100 transistors
MSI = 100–1000
LSI = 1000–10,000
VLSI = 10K–1M
ULSI > 1 Million
⚠️ OS का Timeline:
Batch OS → 2nd Gen
Time-sharing OS → 3rd Gen
GUI/Distributed → 4th Gen
PARAM → 5th Gen (AI era)
Keyboard+Monitor → 3rd Gen पहली बार
🧑‍💼 महत्वपूर्ण व्यक्ति एवं आविष्कार
व्यक्ति आविष्कार / योगदान वर्ष
Charles Babbage Analytical Engine — Father of Computer 1837
Ada Lovelace पहला Algorithm/Program — Mother of Computer / First Programmer 1843
Blaise Pascal Pascaline — पहला Mechanical Calculator 1642
Herman Hollerith Punch Card / Tabulating Machine — 1890 US Census 1890
John Von Neumann Stored Program Concept (EDVAC) — Father of Modern Computer Architecture 1945
Alan Turing Turing Machine — Father of Computer Science 1936
Douglas Engelbart Mouse — Father of Mouse 1964
Jack Kilby + Robert Noyce Integrated Circuit (IC) — 3rd Generation आधार 1958–59
Ted Hoff Intel 4004 — World's First Microprocessor (4-bit) 1971
Christopher Latham Sholes Keyboard (QWERTY Layout) 1868
Karl Ferdinand Braun CRT (Cathode Ray Tube Monitor) 1897
Samarendra Kumar Mitra India का पहला Analog Computer 1953–54
Rangaswami Narasimhan TIFRAC — Father of Indian Computing 1961
🇮🇳 भारत में Computer — First & Important Facts
भारत में पहला Name Year Details
पहला Computer HEC-2M 1955 ISI Kolkata (Indian Statistical Institute)
पहला Indigenous Computer TIFRAC 1961 Tata Institute of Fundamental Research Automatic Calculator। Narasimhan
पहला Micro Computer Siddharth (सिद्धार्थ) 1978 ECIL, Hyderabad। पहला Bilingual (Hindi+English) भी यही
पहला Supercomputer PARAM 8000 1991 C-DAC, Pune। स्थापना 1988।
पहला Microprocessor SHAKTI 2018 IIT Madras। Open-source RISC-V based।
💡 और महत्वपूर्ण Facts:
IBM का उपनाम = "Big Blue"
IBM HQ = New York (Armonk, NY)
IBM पुराना नाम = CTR (Computing-Tabulating-Recording) → IBM (1924)
World पहला Laptop = Epson HX-20 (1981)
Nepal पहला Computer = IBM 1401 (1971 Census)
Supercomputer speed = FLOPS (Floating Point Ops/Sec)
पहला Electronic Computer = ENIAC (1945, USA)
🧠 India Firsts Trick:
HEC-TIFRAC-SS-PARAM-SHAKTI
1955 → 1961 → 1978 → 1991 → 2018
(हर – टी – एस – प – श)
C-DAC = Centre for Development of Advanced Computing
🌐 OS, Internet & Booting

OS प्रकार

Type Examples
Desktop OS Windows (XP/7/8/10/11), macOS, Linux, Ubuntu
Mobile OS Android (Google), iOS (Apple), KaiOS (Jio), Symbian (Nokia), Bada (Samsung)
Server OS Windows Server, Linux Server, UNIX
RTOS Real-Time OS — Embedded systems, Robotics
Network OS Novell NetWare
❌ OS नहीं हैं: BIOS, Apache, Firefox, Chrome, Oracle DB, Pentium (Processor है)

Web Browsers

Browser Company
Chrome Google
Firefox Mozilla (Open Source)
Safari Apple
Edge Microsoft (पहले Internet Explorer)
Opera Opera Software
❌ Browser नहीं: Gmail (Email), KompoZer (HTML Editor), MS Office 365

Booting Process ⭐

Computer ON → BIOS Active (ROM में stored) → POST (Power On Self Test) → OS Load → Desktop
💡 Booting Types:
Cold Boot = Fresh start (Power button से)
Warm Boot = Restart (Ctrl+Alt+Del / software restart)
BIOS = ROM का हिस्सा (Non-Volatile)
🧠 BIOS = Boss (पहले आता है, OS से पहले)
POST = Power ON Self Test (self-check करता है)
MBR = Master Boot Record (Boot sector of HDD)

ICT vs IT ⭐

Term Full Form Scope
ICT Information & Communication Technology बड़ा (IT + Communication — Internet, Telephone, Networking)
IT Information Technology छोटा — ICT का subset है
🚨 ICT ⊃ IT (ICT बड़ा है, IT उसके अंदर आता है)
⌨️ Keyboard Shortcuts + Key Types
Shortcut काम
Ctrl+C Copy
Ctrl+X Cut
Ctrl+V Paste
Ctrl+Z Undo
Ctrl+Y Redo
Ctrl+P Print
Ctrl+S Save
Ctrl+A Select All
Ctrl+F Find
Ctrl+E Center Align
Ctrl+I Italic
Ctrl+B Bold
Ctrl+Home Document की शुरुआत में जाओ
Ctrl+End Document के अंत में जाओ
Shortcut काम
Alt+F4 Window बंद करो
Alt+Tab Program switch
Win+R Run command
Win+D Desktop दिखाओ
Win+E File Explorer
Win+Shift+S Snipping Tool (Screenshot)
Shift+Del Permanent Delete (Recycle Bin bypass)
Ctrl+F2 Print Preview
F1 Help
F5 Refresh
F12 Save As
Ctrl+Alt+Del Task Manager / Warm Boot
Print Screen Full screen screenshot
Tab Next field / Indent

Key Types ⭐

Key Type Examples विशेषता
Modifier Keys Ctrl, Shift, Alt अकेले काम नहीं करते — दूसरी key के साथ use होते हैं
Toggle Keys Caps Lock, Num Lock, Scroll Lock ON/OFF switch की तरह
Function Keys F1–F12 कुल 12 keys। F1=Help, F5=Refresh, F12=Save As
Navigation Keys Arrow keys, Page Up/Down, Home, End Cursor move करना
Special Keys Esc, Delete, Insert, Enter, Backspace विशिष्ट कार्य
Alphanumeric Keys A-Z, 0-9 Main typing keys
🦠 Virus / Malware / Security
Term अर्थ Example
Virus File attach होकर spread होता है। Software है। Creeper = पहला Computer Virus
Worm Self-replicate। Network से फैलता है। No host file needed। Morris Worm
Trojan Horse Legitimate software की तरह दिखता है, harm करता है। —
Spyware User activity track करता है बिना knowledge के। Pegasus = Spyware
Ransomware Files encrypt करके पैसे माँगता है। WannaCry
Adware Unwanted ads दिखाता है। —
Phishing Fake website/email से password चुराना। —
Rootkit Admin access छुपाकर system control करता है। —
Keylogger Keyboard keystrokes record करता है। —
Firewall Network traffic filter। Security barrier। Windows Firewall
Software Piracy Software की illegal copy/distribution। —
Debugging Program की errors (Bugs) ढूँढना और fix करना। —
💡 Antivirus Examples: Avast, Norton, Kaspersky, McAfee, AVG, NOD32, Quick Heal, Bitdefender
Virus vs Worm: Virus को Host file चाहिए, Worm self-replicate करता है बिना host के।
📋 महत्वपूर्ण Full Forms
Abbreviation Full Form
VIRUS Vital Information Resources Under Siege
BIOS Basic Input/Output System
GUI Graphical User Interface
CUI Character/Command User Interface
OCR Optical Character Recognition
OMR Optical Mark Reader/Recognition
MICR Magnetic Ink Character Recognition
RAM Random Access Memory
ROM Read Only Memory
EPROM Erasable Programmable ROM
EEPROM Electrically Erasable Programmable ROM
VDU Visual Display Unit (Monitor)
USB Universal Serial Bus
HDMI High Definition Multimedia Interface
VGA Video Graphics Array
PDF Portable Document Format
Abbreviation Full Form
DTP Desktop Publishing
WYSIWYG What You See Is What You Get
UPC Universal Product Code (12 digits)
FLOPS Floating Point Operations Per Second
ICT Information & Communication Technology
CPU Central Processing Unit
ALU Arithmetic Logic Unit
CU Control Unit
WORM Write Once Read Many
VLSI Very Large Scale Integration
ULSI Ultra Large Scale Integration
IC Integrated Circuit
NAS Network Attached Storage
SMPS Switched Mode Power Supply
POST Power On Self Test
MBR Master Boot Record
⚙️ Computer Characteristics + Hardware vs Software

Computer Characteristics ⭐

Characteristic Hindi One-Line
Speed गति Microsecond में calculations — अत्यंत तेज़
Accuracy शुद्धता GIGO: Garbage In → Garbage Out। सही input → सही output।
Diligence परिश्रम बिना थके बार-बार एक ही काम करता है
Versatility बहुउपयोगिता अलग-अलग काम एक साथ (Multitasking)
Automation स्वचालन Program load → बिना human help के चलता है
Reliability विश्वसनीयता बार-बार same correct result
Storage भण्डारण विशाल data store और retrieve
No IQ (Limitation) बुद्धि नहीं खुद सोचने की कोई क्षमता नहीं — GIGO rule

Hardware vs Software

Feature Hardware Software
Nature Physical (छू सकते हो) Programs/Instructions (छू नहीं सकते)
Examples CPU, RAM, HDD, Monitor, Keyboard, Mouse Windows, MS Word, Chrome, Antivirus
Virus Hardware को virus नहीं होता ❌ Software को virus होता है ✅
Dependent Software के बिना useless Hardware के बिना चल नहीं सकता

GUI vs CUI

Feature GUI (Graphical UI) CUI (Character UI)
Interface WIMP: Window, Icon, Menu, Pointer Text commands (keyboard only)
Examples Windows, macOS, Android MS-DOS, Linux Terminal
Uses Graphs? ❌ नहीं (WIMP में Graphs नहीं) ❌ नहीं
Ease of Use User-friendly Technical knowledge needed
💾 Hard Disk — Structure & Cylinders

HDD Structure (Byte → Platter)

Byte → Sector (512B) → Cluster → Track → Cylinder → Platter
Term Definition
Sector HDD की सबसे छोटी unit = 512 Bytes। Smallest addressable unit।
Track Circular path on platter surface।
Cylinder सभी platters पर same track number = 1 Cylinder। Count = Tracks per surface।
Platter Aluminium disk। Iron Oxide coating। Magnetic data store।
RPM Revolutions Per Minute = Speed measure। 5400, 7200 RPM common।
🚨 Cylinder Calculation Trap:
गलत: 10 surfaces × 5 tracks = 50 Cylinders
सही: Cylinders = Tracks per surface = 5
Cylinder = एक column जो सभी surfaces पर same track number join करता है।
Number of Cylinders = Number of Tracks per surface (surface count से multiply नहीं)
💡 HDD vs SSD:
HDD = Moving parts (Platter + Head)। धीमा। Fragile।
SSD = No moving parts। Flash memory। Fast। Shock-resistant।
Both = Non-Volatile (Secondary Memory)
⚡ Rapid Revision — अंतिम 5 मिनट
Memory Speed क्रम (Fast → Slow)
  • Register (fastest — CPU inside)
  • Cache L1 → L2 → L3 (SRAM)
  • RAM (DRAM — Main memory)
  • SSD (Flash — No moving parts)
  • HDD (Magnetic — Platters)
  • Optical Disk (CD/DVD)
  • Magnetic Tape (slowest — Sequential)
Printer: Impact vs Non-Impact
  • Impact: Dot Matrix, Daisy Wheel, Drum, Chain, Band
  • Non-Impact (LIT): Laser, Inkjet, Thermal
  • Quality = DPI | CPS = char/sec | LPM = line/min | PPM = page/min
  • Daisy Wheel ❌ Graphics
  • Thermal = ATM receipt, Heat-sensitive paper
Generations — Core Tech
  • 1st = Vacuum Tube (Machine lang)
  • 2nd = Transistor (Assembly + FORTRAN)
  • 3rd = IC — SSI/MSI (Keyboard+Monitor first time)
  • 4th = VLSI/Microprocessor (PC era)
  • 5th = ULSI + AI (PARAM, NLP)
India Firsts
  • 1st Computer → HEC-2M (1955, ISI Kolkata)
  • 1st Indigenous → TIFRAC (1961, TIFR)
  • 1st Micro → Siddharth (1978, ECIL Hyderabad)
  • 1st Supercomputer → PARAM 8000 (1991, C-DAC Pune)
  • 1st Microprocessor → SHAKTI (2018, IIT Madras)
Software Categories
  • System → OS, Driver, Compiler, Utility
  • Application → Word, Excel, Chrome, DTP
  • Utility → Antivirus, WinZip, Disk Cleanup
  • Open Source → Linux, Firefox, GIMP, VLC
  • Proprietary → Adobe, Windows, MS Office
Virus Types
  • Virus → file attach (Creeper = 1st)
  • Worm → self-replicate (Morris)
  • Trojan → fake legitimate software
  • Spyware → track (Pegasus)
  • Ransomware → encrypt + money (WannaCry)
📌 सभी Key One-Liners — एक नज़र में
Topic One-Line Fact
Smallest unit Bit (0 या 1) → Nibble(4) → Byte(8) → KB(1024B)
RAM vs ROM RAM = Volatile (power off → gone)। ROM = Non-Volatile (BIOS)।
DRAM vs SRAM DRAM = Capacitor, refresh ज़रूरी, सस्ता, Main RAM। SRAM = Flip-Flop, fast, महँगा, Cache।
Cylinder Cylinder count = Tracks per surface (surface × tracks नहीं)।
Plotter Output device। CAD/Maps। Vector graphics। Pen से lines।
Laser Non-Impact printer। Toner (dry powder)। Best quality।
Booting BIOS → POST → OS Load। BIOS = ROM में।
ICT vs IT ICT ⊃ IT। ICT = IT + Communication।
Open Source Linux, Firefox, GIMP, VLC, LibreOffice। Adobe = Proprietary।
GUI elements WIMP: Window, Icon, Menu, Pointer। Graphs नहीं।
HEC-2M India's 1st Computer (1955)। TIFRAC = 1st Indigenous (1961)।
PARAM 8000 India's 1st Supercomputer (1991)। C-DAC Pune।
Compiler पूरा code एक साथ → .obj file → Fast execution।
Interpreter Line-by-line → No file → Slow execution → Easy debug।
Generations trick V-T-I-V-U = Vacuum Tube → Transistor → IC → VLSI → ULSI।
💻 FOC Master Revision Handbook | RSMSSB BCI Exam | Error Log + All Notes से तैयार | अंतिम अद्यतन: August 2026
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