कंप्यूटर ज्ञान (Computer Awareness)

1. Basics & History of Computer

Definition: A computer is an electronic device that can store, retrieve, and process data to produce meaningful information.

Full Form: Commonly Operated Machine Particularly Used for Technical, Educational & Research.

Important Personalities & Facts

Charles Babbage: Father of Computer (Designed Difference Engine in 1822 & Analytical Engine in 1837).
Alan Turing: Father of Modern Computer Science.
Ada Lovelace: First Computer Programmer.
ENIAC (1946): First electronic general-purpose computer.
Siddharth (1986): First computer made in India.
Computer Literacy Day: Celebrated on 2nd December.

CPU Speed Measurement: Measured in clock cycles (Hz, kHz, MHz, GHz). Example: 3.0 GHz = 3 billion cycles per second.

2. Generations & Types of Computers

Generation	Hardware Component	Key Characteristics & Examples
First (1940-56)	Vacuum Tubes	Very large, costly, slow. Machine Language (0 & 1). Ex: ENIAC, UNIVAC-1
Second (1956-63)	Transistors	Smaller, faster. Assembly & Early HLL (COBOL, FORTRAN). Ex: IBM 1401
Third (1964-71)	Integrated Circuits (ICs)	OS & multiprogramming supported. HLL (C, BASIC). Ex: IBM 360
Fourth (1971-Present)	Microprocessors (VLSI)	Portable, affordable, GUI, Internet. Ex: IBM PC, Apple Mac
Fifth (Present & Beyond)	ULSI, AI Chips	AI, Machine Learning, Robotics, NLP. Ex: IBM Watson, Quantum Computers

Types Based on Type & Purpose

Analog: Continuous data (Thermometer, Speedometer).
Digital: Discrete/binary data (PC, Laptop).
Hybrid: Analog + Digital (Petrol pumps, ECG).
General Purpose: Multi-task (Browsing, gaming).
Special Purpose: Built for specific task (ATMs, Weather forecast).

Types Based on Size

Supercomputers: Most powerful (PARAM, Summit, Frontier).
Mainframe: Large systems for bulk processing (IBM zSeries).
Minicomputers: Mid-sized for small businesses (PDP-11).
Microcomputers: Smallest, personal use (Desktops, Smartphones).
India's First Supercomputer: PARAM 8000 (1991, C-DAC).

3. Architecture & I/O Devices

CPU (Central Processing Unit) is the brain of the computer. It consists of:

Control Unit (CU): Directs data flow and instructions.
ALU (Arithmetic Logic Unit): Performs mathematical & logical (>, <, =) operations.
Registers: High-speed internal storage for temporary data.

Input Devices	Output Devices
Keyboard & Mouse (Pointing device) Scanner, OCR, OMR, MICR (Banks), Barcode/QR Scanner Trackball, Joystick, Light Pen, Stylus Biometric: Fingerprint, Iris, Face, Voice Recognition	Monitor (VDU): CRT, LCD, LED, OLED Printers: Impact: Dot Matrix, Line, Daisy Wheel (noisy, strike paper) Non-Impact: Inkjet, Laser, Thermal (fast, quiet) Plotter: For large blueprints/maps Speaker & Headphones

4. Computer Memory & Units

Memory Hierarchy (Fastest to Slowest): Registers → Cache Memory (L1, L2, L3) → Primary Memory (RAM/ROM) → Secondary Memory (HDD/SSD).

Primary Memory

RAM (Random Access Memory): Volatile (data lost on power off), Read/Write. Types: SRAM (Cache, fast/costly), DRAM (Main memory, needs refresh).
ROM (Read Only Memory): Non-volatile (data retained), mostly Read-only. Types: PROM (programmable once), EPROM (UV erasable), EEPROM (Electrically erasable), Flash Memory (SSDs/Pen drives).

Secondary Memory

Magnetic: Hard Disk Drive (HDD).
Optical: CD (700 MB), DVD (4.7-17 GB), Blu-Ray (25-128 GB).
Solid-State: SSD (faster, no moving parts), USB Flash Drive, SD Cards.

Memory Units Hierarchy

Trick: Brilliant New Boys Know Memory Grows Too Powerful Every Zone Yes!

Bit (0/1) ➔ Nibble (4 bits) ➔ Byte (8 bits) ➔ KB (1024 B) ➔ MB ➔ GB ➔ TB ➔ PB ➔ EB ➔ ZB ➔ YB

5. Languages & Software

Computer Languages

Low-Level: Machine Lang (0s & 1s, fastest), Assembly Lang (Mnemonics like ADD, SUB).
High-Level (HLL): English-like. Procedural: C, FORTRAN (First HLL, scientific), COBOL (Business). OOP: C++, Java, Python.
4GL/5GL: SQL, Prolog, LISP (used in AI).
Translators: Compiler (whole program), Interpreter (line by line), Assembler (Assembly to Machine).

Software Types

System Software: OS, Device Drivers, Utility Programs (Antivirus, WinRAR).
Application Software: General (MS Office, VLC), Special Purpose (Tally, AutoCAD).
Freeware: Free, no modify (Skype). Shareware: Trial then paid. Open Source: Source code available (Linux, Python).
Firmware: Permanent software in ROM (BIOS).

6. OS & Important Shortcuts

Operating System (OS): Interface between user and hardware. Functions: Process, Memory, File, Device management, Security, UI.

Important Shortcuts	Function	Important Shortcuts	Function
Alt + Tab	Switch applications	Ctrl + Z / Y	Undo / Redo
Alt + F4	Close window	Ctrl + H	Find & Replace
Win + D	Show Desktop	Shift + Delete	Permanently delete
Win + E	File Explorer	F2	Rename file/folder
Win + L	Lock computer	F5	Refresh
Win + R	Open Run dialog	F7	Spell & Grammar check

7. Internet, Networking & E-Banking

Internet History: Began with ARPANET (1969, USA). WWW invented by Tim Berners-Lee (1989).

Network Types & Topologies

PAN (Bluetooth), LAN (Wi-Fi/Office), MAN (City/Cable TV), WAN (Internet), VPN (Secure tunnel).
Simplex: One-way (TV). Half-Duplex: Two-way, one at a time (Walkie-talkie). Full-Duplex: Two-way simultaneous (Phone).
Topologies: Bus (Single cable), Star (Central Hub/Switch), Ring, Mesh (Highly reliable, complex), Tree.
Devices: Router (IP based), Switch (MAC based), Modem (Digital ↔ Analog).

Protocols & Terms

HTTP/HTTPS: Port 80/443, Web transfer.
SMTP: Port 25, Sending emails.
POP3 / IMAP: Receiving emails.
DNS: Converts Domain Name to IP address.
E-Banking: NEFT (Batch, no limit), RTGS (Real-time, min 2 lakh), IMPS (Instant, 24x7, NPCI).

8. Malware & Cryptography

Malware Type	Description
Virus	Needs host program, corrupts files (ILOVEYOU).
Worm	Self-replicating, spreads through network, no host needed.
Trojan Horse	Appears useful but secretly damages system/opens backdoors.
Ransomware	Locks/encrypts data and demands money (WannaCry).
Spyware / Keylogger	Secretly monitors activity / Records keystrokes.
Phishing	Fake websites/emails to steal credentials.
DDoS	Flooding servers with traffic to crash them.

Cryptography: Symmetric Key (Same key for encrypt/decrypt), Asymmetric Key (Public key to encrypt, Private to decrypt).

9. Microsoft Office Suite

MS Word (Word Processor)

Home Tab: Clipboard, Font, Paragraph (Alignment, Spacing).
Insert Tab: Tables, Pictures, Links, Header/Footer.
Mailings Tab: Envelopes, Labels, Mail Merge.
Review Tab: Spelling & Grammar, Thesaurus, Track Changes.

MS Excel (Spreadsheet)

Structure: Workbook > Worksheet > Rows/Columns > Cell.
Every formula starts with =.
Functions: SUM, AVERAGE, COUNT, IF, AND, OR, VLOOKUP (vertical search).
Data Tab: Sort & Filter, Data Validation, What-If Analysis.

MS PowerPoint (Presentation)

Slide Master: Controls overall design/theme of slides.
Transitions: Visual effects between slides.
Animations: Effects applied to objects (text, shapes) inside a slide.
Slide Sorter View: Displays all slides in thumbnail view for easy reordering.

⚡ Active Recall • तुरंत स्व-मूल्यांकन

🎯 अभी इसी टॉपिक के 5 प्रश्न हल करें (Instant Topic Quiz)

विषय: कंप्यूटर सामान्य ज्ञान (Hostel Warden एवं CG व्यापम विशेष) — ऊपर पढ़े गए नोट्स की तुरंत जाँच करें!

आपका लाइव स्कोर

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अभ्यास प्रश्न #1 CGPSC / CG Vyapam Standard (+2.0, -0.66)

प्र. 1: निम्नलिखित में से कौन-सा एक "इम्पैक्ट प्रिंटर (Impact Printer)" का उदाहरण है जो रिबन पर प्रहार करके छपाई करता है?

अभ्यास प्रश्न #2 CGPSC / CG Vyapam Standard (+2.0, -0.66)

प्र. 2: कंप्यूटर मेमोरी पदानुक्रम (Memory Hierarchy) में सबसे तेज गति की मेमोरी कौन-सी होती है?

अभ्यास प्रश्न #3 CGPSC / CG Vyapam Standard (+2.0, -0.66)

प्र. 3: MS Excel में किसी भी फॉर्मूला (Formula) की शुरुआत अनिवार्य रूप से किस चिन्ह से होती है?

अभ्यास प्रश्न #4 CGPSC / CG Vyapam Standard (+2.0, -0.66)

प्र. 4: निम्नलिखित में से कौन-सा एक "ओपन सोर्स ऑपरेटिंग सिस्टम (Open Source OS)" है?

अभ्यास प्रश्न #5 CGPSC / CG Vyapam Standard (+2.0, -0.66)

प्र. 5: इंटरनेट सुरक्षा में "फ़ायरवॉल (Firewall)" का मुख्य कार्य क्या है?

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