Based on computer – geeksforjobs

 

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Computer brevity

  • C – Generally
  • O – operating
  • M-machine
  • P – Specifically
  • U – used for
  • T – Technical Trade
  • E-education
  • The research
  • User-> Input-> Process-> Output-> User

Classification of software:

  1. Software + Free for lifetime-> Freeware
    1. For example, browsers, Adobe readers, media players, etc.
  2. Software + Use after purchase-> License Ware
    1. For example, Os (Windows, MACINTOSH)
  3. Software + trial version-> shareware
    1. For example, antivirus, IDM (Internet Download Manager)

history of computer :

  • First Counting Machine – ABACUS
  • Blaze Pascal – Pascal Line
  • Got Fried von Leibnitz – Reckoning Machine
  • Joseph Jacquard – Jacquard Loom
  • Charles Babbage – Differential Engine
  • Charles Babbage – Analytical Engine (fastest calculating machine)
  • Lady Ada Augusta – First Lady Programmer

Model of computer – Charles Babbage

Computer generation

  • First Generation – Vaccumtube
  • Second Generation – Transistor
  • Third Generation – IC
  • 4th Generation – Mass Integration
  • 5th Generation – VLSI
  • Total number of keys in the keyboard – 108
  • Keyboard Layout –
  • Fastest keyboard layout – DVORAK

Key Type:

  1. Alphabetic Keys (AZ)
  2. Numeric keys (0 -9)
  3. Function keys (F1 -F12)
  4. arrow keys
  5. Special Keys (ctrl, alt, shift, spacebar, ESC, Home, End)
  6. Multimedia Keys (Volume, Brightness)
Navigation Key:

The key that is used to move from one page / window to another.

  • Arrow Keys, PageUp, PageDown, Home, End
  • Alt + tab-> left to right
  • Alt + Shift + tab-> right to left
Modifier Key:
  • Keys that do not work separately, which work in conjunction with another key.
  • ctrl + A -> select all
  • Shift + A-> A (Capital)
  • ctrl + Alt + Del -> Task Manager
Toggle Keys:
  • Toggle -> switch (on / off)
  • Key that acts as a ‘switch’
  • Capslock, number lock, insert
Sticky Keys:
  • Sticky Notes (for reminder)
  • Change key (press arrow 5 times)


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