💻 Computer Study Guide for Exams

1. Basics of Computer

  • Definition: Electronic machine that processes data
  • Full Form of Computer: Common Operating Machine Purposely Used for Technological and Educational Research (not official but commonly asked)
  • Components:
    • Input → Keyboard, Mouse
    • Processing → CPU
    • Output → Monitor, Printer

2. Generations of Computer

  1. First Generation – Vacuum Tubes
  2. Second Generation – Transistors
  3. Third Generation – IC (Integrated Circuits)
  4. Fourth Generation – Microprocessors
  5. Fifth Generation – Artificial Intelligence

3. CPU (Central Processing Unit)

  • Brain of computer
  • Parts:
    • ALU (Arithmetic Logic Unit)
    • CU (Control Unit)
    • Registers

4. Memory (Important for Exams)

Primary Memory

  • RAM (Volatile)
  • ROM (Non-volatile)

Secondary Memory

  • Hard Disk
  • Pen Drive
  • CD/DVD

👉 Units:

  • Bit → Byte → KB → MB → GB → TB

5. Input & Output Devices

Input

  • Keyboard
  • Mouse
  • Scanner
  • Microphone

Output

  • Monitor
  • Printer
  • Speaker

6. Software

System Software

  • Windows Operating System
  • Linux Operating System

Application Software

  • Microsoft Word
  • Microsoft Excel
  • Microsoft PowerPoint

7. Operating System (OS)

  • Acts as interface between user and hardware
  • Functions:
    • File management
    • Memory management
    • Process management

Examples:

  • Windows 10
  • macOS
  • Android

8. Internet & Networking

  • Internet = Global network
  • WWW = Web system
  • Browser Examples:
    • Google Chrome
    • Mozilla Firefox

👉 Terms:

  • IP Address
  • HTTP / HTTPS
  • Email

9. MS Office (Very Important)

  • Word → Document
  • Excel → Calculations
  • PowerPoint → Presentation

Shortcut keys (Important):

  • Ctrl + C → Copy
  • Ctrl + V → Paste
  • Ctrl + S → Save

10. Cyber Security

  • Virus
  • Antivirus
  • Malware
  • Phishing

11. Important Full Forms

  • CPU – Central Processing Unit
  • RAM – Random Access Memory
  • ROM – Read Only Memory
  • USB – Universal Serial Bus
  • URL – Uniform Resource Locator

🎯 Exam Tips

  • Focus on MCQs + previous year questions
  • Practice shortcuts & full forms daily
  • Revise basic concepts (RAM, CPU, OS)