Quick Revision Notes
Delhi Police Exam
This comprehensive revision guide covers all essential computer awareness topics for the Delhi Police Exam. Use these quick notes for last-minute revision and to reinforce key concepts that frequently appear in competitive exams.
1. Computer Basics
Key Definitions:
- Definition: Electronic device that processes data to produce meaningful information
- Characteristics: Speed, accuracy, storage, automation
- Components: Input, Processing, Output, Storage (IPOS cycle)
Types of Computers:
- Micro, Mini, Mainframe, Super
Computer Generations:
1st Gen: Vacuum tubes
2nd Gen: Transistors
3rd Gen: ICs
4th Gen: Microprocessors
5th Gen: AI-based computers
Exam Trick: Remember "V-T-I-M-A" = Vacuum → Transistor → IC → Microprocessor → AI.
2. Hardware & Software
Hardware:
Physical components (CPU, Monitor, Keyboard, Mouse)
Software:
System Software: OS, Utilities
Application Software: Word Processor, Excel, Browser
Peripheral Devices:
Input Devices:
Keyboard, Mouse, Scanner, MICR, OMR, OCR
Output Devices:
Monitor, Printer, Speaker, Projector, Plotter
3. MS Word & Excel Basics
MS Word:
Interface:
Ribbon tabs (Home, Insert, Layout, Review)
Elements:
Table, Image, Header/Footer, Page Number
Shortcut Keys:
Excel:
Interface:
Workbook, Worksheet, Cells
Functions:
SUM, AVERAGE, IF, COUNTIF
Charts:
Bar, Pie, Line
Shortcut Keys:
Exam Trick: MCQs often ask shortcuts + function uses + chart types.
4. Operating Systems
Definition:
Software managing hardware & software resources
Functions:
- Memory Management
- Process Management
- File Management
- Device Management
Types:
Batch OS
Multitasking OS
Real-time OS
Distributed OS
Mobile OS:
Android, iOS
Exam Trick: Memory management + multitasking examples are common PYQs.
5. Cybersecurity Basics
Computer Virus:
Types: Trojan, Worm, Ransomware
Symptoms: Slow performance, pop-ups, crashes
Firewall:
Hardware/Software
NGFW, Packet Filtering, Proxy
Cybercrime:
Phishing
Malware
Identity Theft
Hacking
Safe Practices:
2FA, regular updates, avoid unknown links
Exam Trick: Remember "Phish → Hook, Malware → Harm, Firewall → Guard".
6. Acronyms Quick Sheet
| Acronym | Meaning | Use/Example |
|---|---|---|
| CPU | Central Processing Unit | Brain of the computer |
| RAM | Random Access Memory | Temporary storage |
| ROM | Read-Only Memory | Permanent storage |
| BIOS | Basic Input Output System | Booting |
| LAN | Local Area Network | Small network |
| WAN | Wide Area Network | Large network |
| IP | Internet Protocol | Unique address |
| DNS | Domain Name System | Converts domain to IP |
| HTML | HyperText Markup Language | Website code |
| HTTP | HyperText Transfer Protocol | Communication on web |
| URL | Uniform Resource Locator | Website address |
| Portable Document Format | Document format | |
| SSD | Solid State Drive | Storage device |
| HDD | Hard Disk Drive | Storage device |
| USB | Universal Serial Bus | Connects devices |
Exam Trick: Acronyms = favorite PYQ topic. Memorize table for fast answers.
7. Quick Revision Tips
Make flashcards for acronyms and definitions
Practice shortcuts in Word & Excel regularly
Revise PYQs for each topic before exam
Remember the IPOS cycle: Input → Processing → Output → Storage
Use the "Trick Table" method for malware, firewall, phishing
Final Exam Tip
Delhi Police Computer section mostly asks definitions, functions, types, acronyms, and shortcuts. Quick revision notes + PYQs + tricks = high chance of scoring full marks.
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