IT and Computers
Subject: General Science — Technology & Environment | Topic: IT and Computers Exam: AP Group 2 (APPSC) | Sources: Lucent's GS, Digital India official
Introduction
IT and computers is a growing topic for APPSC with 1-2 questions expected on computer generations, Digital India initiatives, and emerging technologies (AI, blockchain, 5G). UPI and Aadhaar are particularly relevant.
Generations of Computers
| Generation | Period | Technology | Example |
|---|---|---|---|
| First | 1946-1956 | Vacuum tubes | ENIAC, UNIVAC |
| Second | 1956-1963 | Transistors | IBM 1401 |
| Third | 1964-1971 | Integrated Circuits (ICs) | IBM 360 |
| Fourth | 1971-present | Microprocessors (VLSI/ULSI) | IBM PC, Mac. Intel 4004 (first microprocessor, 1971) |
| Fifth | Present+ | AI, quantum computing, NLP | — |
- Charles Babbage: Father of Computer (Analytical Engine, 1837).
- Ada Lovelace: First computer programmer.
- ENIAC (1946): First general-purpose electronic computer.
Computer Basics
- Binary system: Bit (0/1) → 8 bits = 1 Byte → 1 KB = 1024 B → 1 MB = 1024 KB → 1 GB = 1024 MB → 1 TB = 1024 GB.
- Hardware: Physical components. Software: Programs/instructions.
- Input: Keyboard, Mouse, Scanner, Biometric. Output: Monitor, Printer, Speaker.
Memory and Storage
| Type | Nature | Examples |
|---|---|---|
| RAM (Primary) | Volatile, fast, temporary | Data lost when power off |
| ROM (Primary) | Non-volatile, stores firmware/BIOS | Permanent |
| Secondary | Non-volatile, large capacity | HDD, SSD, USB, CD/DVD |
| Cache | Very fast, between CPU and RAM | Speeds processing |
Software and Programming
- OS: Windows, Linux, macOS, Android, iOS. Manages hardware, provides UI.
- Open source: Linux, Android, LibreOffice. Proprietary: Windows, MS Office.
- Languages: Machine (binary) → Assembly (mnemonics) → High-level (C, Java, Python).
- Algorithm: Step-by-step procedure. Flowchart: Graphical representation.
Internet and Networking
| Term | Details |
|---|---|
| Internet | Global network using TCP/IP protocol |
| WWW | Invented by Tim Berners-Lee (1989) at CERN |
| First email | Ray Tomlinson (1971); used '@' symbol |
| LAN | Within a building |
| WAN | Across cities/countries |
| Cloud computing | Services over internet (Google Drive, AWS, Azure) |
| IP Address | IPv4 (32-bit), IPv6 (128-bit) |
Cybersecurity
| Threat | Description |
|---|---|
| Virus | Replicates, damages files |
| Worm | Self-replicating without user action |
| Trojan | Disguised as legitimate software |
| Phishing | Fake emails/websites to steal data |
| Firewall | Monitors network traffic |
| Encryption | Symmetric (same key) or Asymmetric (public + private keys) |
Emerging Technologies
| Technology | Key Facts |
|---|---|
| AI | Machines that learn and reason. ML = learns from data. Deep Learning = neural networks |
| Blockchain | Distributed immutable ledger. Used in Bitcoin, supply chain |
| 5G | Up to 10 Gbps, low latency. Enables IoT, autonomous vehicles |
| IoT | Network of connected physical devices. Smart home, wearables |
| Quantum Computing | Qubits (superposition: 0, 1, or both). Exponentially faster for certain problems |
Digital India Initiative
- Launched 1 July 2015 by PM Modi. Three pillars: digital infrastructure, governance, literacy.
- Nine Pillars: Broadband, Universal phone access, Public internet, e-Governance, e-Kranti, Information for all, Electronics manufacturing, IT for jobs, Early harvest.
| Initiative | Details |
|---|---|
| UPI | Instant mobile payments (NPCI). 15 billion+ transactions/month (2025) |
| Aadhaar | 12-digit biometric ID. World's largest biometric system |
| DigiLocker | Cloud storage for official documents. 53+ crore users |
| BHIM | UPI-based payment app. Named after Dr. B.R. Ambedkar |
India's IT Sector
- Revenue projected at US$300 billion in FY26.
- World's largest IT outsourcing destination.
- Major hubs: Bengaluru, Hyderabad, Pune, Chennai, Noida, Visakhapatnam (emerging).
Likely Exam Questions
-
The Father of Computer is: Ans: Charles Babbage
-
The first general-purpose electronic computer was: Ans: ENIAC (1946)
-
The World Wide Web was invented by: Ans: Tim Berners-Lee (1989, at CERN)
-
Digital India was launched on: Ans: 1 July 2015
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Aadhaar is a ___ digit identification number: Ans: 12-digit
-
1 KB equals: Ans: 1024 Bytes
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The first microprocessor was: Ans: Intel 4004 (1971)
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UPI stands for: Ans: Unified Payments Interface
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RAM is what type of memory? Ans: Volatile (temporary — data lost when power off)
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BHIM app is named after: Ans: Dr. B.R. Ambedkar