2.7 Uses of Internet, Computer Awareness & Digital Governance
Key Takeaways
- The CIL Paper-I syllabus contains an explicit bullet on Uses of Internet and Computer Awareness, so basic hardware, software and networking vocabulary is directly examinable.
- RAM is volatile working memory that loses its contents on power-off, whereas ROM is non-volatile and retains firmware such as the BIOS.
- One byte equals eight bits, and storage units advance by factors of 1024 from kilobyte through megabyte, gigabyte and terabyte.
- SMTP is used to send electronic mail while POP3 and IMAP retrieve it, and the World Wide Web was created by Tim Berners-Lee at CERN in 1989.
Computer Architecture
Every computer follows the same functional layout, usually credited to the von Neumann stored-program model.
| Unit | Function |
|---|---|
| Input devices | Keyboard, mouse, scanner, microphone — feed data in |
| CPU | The processor; contains the ALU and the control unit |
| ALU | Arithmetic Logic Unit — performs calculations and comparisons |
| Control Unit | Fetches, decodes and sequences instructions |
| Memory | Holds instructions and data |
| Output devices | Monitor, printer, speaker — deliver results |
The CPU is often called the brain of the computer. Its speed is measured in hertz, now typically gigahertz.
Memory: The Distinction That Matters
| Type | Volatile? | Purpose |
|---|---|---|
| RAM (Random Access Memory) | Yes — contents lost on power-off | Working memory for running programs |
| ROM (Read Only Memory) | No | Permanent firmware such as the BIOS |
| Cache | Yes | Very fast small memory close to the CPU |
| Secondary storage | No | Hard disk, SSD, optical disc, flash drive |
RAM subdivides into SRAM (static, faster, used for cache) and DRAM (dynamic, needs refreshing, used for main memory). ROM variants include PROM, EPROM and EEPROM.
The single most-asked item here is that RAM is volatile and ROM is not.
Storage Units
| Unit | Equals |
|---|---|
| 1 kilobyte (KB) | 1024 bytes |
| 1 megabyte (MB) | 1024 KB |
| 1 gigabyte (GB) | 1024 MB |
| 1 terabyte (TB) | 1024 GB |
| 1 petabyte (PB) | 1024 TB |
A nibble is 4 bits. The smallest unit of data is the bit, a single binary digit taking the value 0 or 1.
Software
System software runs the machine: operating systems such as Windows, Linux, macOS and Android; device drivers; utilities. Application software does user work: word processors, spreadsheets, browsers, database packages.
An operating system manages memory, processes, files and devices, and provides the user interface. Open-source software such as Linux publishes its source code freely, in contrast to proprietary software.
Common file extensions: .docx word processing, .xlsx spreadsheet, .pptx presentation, .pdf portable document, .jpg and .png images, .mp4 video, .exe executable.
Keyboard Shortcuts
| Shortcut | Action |
|---|---|
| Ctrl + C / X / V | Copy / cut / paste |
| Ctrl + Z / Y | Undo / redo |
| Ctrl + A | Select all |
| Ctrl + S | Save |
| Ctrl + F | Find |
| Ctrl + P | |
| Alt + Tab | Switch between open applications |
| F5 | Refresh |
Networking and the Internet
Network types by scale
| Type | Coverage |
|---|---|
| LAN Local Area Network | A single building or campus |
| MAN Metropolitan Area Network | A city |
| WAN Wide Area Network | A country or the globe; the Internet is the largest WAN |
Key terms
- The Internet is the global network of interconnected networks; the World Wide Web is one service running on it, created by Tim Berners-Lee at CERN in 1989. The two are not synonyms, and that distinction is itself an exam item.
- An IP address uniquely identifies a device on a network. DNS (Domain Name System) translates human-readable names such as coalindia.in into IP addresses.
- A URL (Uniform Resource Locator) is a web address. HTTP transfers web pages; HTTPS adds encryption. HTML is the markup language of web pages.
- FTP transfers files. SMTP sends email; POP3 and IMAP retrieve it. The send-versus-receive split is the standard discriminator in objective items.
- A search engine indexes web content; a browser renders it.
- Cloud computing delivers storage and compute as an on-demand service rather than from local hardware.
Cyber-safety vocabulary
| Term | Meaning |
|---|---|
| Firewall | Filters traffic between a trusted network and an untrusted one |
| Malware | Umbrella term for malicious software |
| Virus | Malicious code that attaches to a host file and needs it to spread |
| Worm | Self-replicating malware that spreads without a host file |
| Trojan | Malware disguised as legitimate software |
| Ransomware | Encrypts data and demands payment |
| Phishing | Fraudulent messages impersonating a trusted party to steal credentials |
| Spam | Unsolicited bulk messages |
The national nodal agency for cyber incidents is CERT-In, the Indian Computer Emergency Response Team. The governing statute is the Information Technology Act, 2000.
Digital Governance in India
The syllabus pairs computer awareness with flagship programmes, and the digital ones recur:
| Initiative | Note |
|---|---|
| Digital India | Launched 1 July 2015 to make India a digitally empowered society |
| Aadhaar | Twelve-digit unique identity issued by UIDAI |
| UPI | Unified Payments Interface, operated by NPCI; real-time mobile payments |
| DigiLocker | Cloud storage for verified official documents |
| BHIM | UPI-based payment application |
| e-Governance | Categories are Government to Citizen, Government to Business, Government to Government, and Government to Employee |
| Common Service Centres | Rural access points for digital services |
Within Coal India itself, digital initiatives include e-auction of coal through online portals, GPS-based despatch tracking, and the Coal Ministry's transparency dashboards — a plausible link between this bullet and the coal-sector-awareness bullet.
Which statement correctly distinguishes RAM from ROM?
Which protocol is used to SEND electronic mail?
One gigabyte is equal to:
Phishing refers to: