Computer Science Class 11 Chapter 1 Notes

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• What is a Global Village ? Define or Describe Global Village.
• How the World has become a Global Village today.
• What is Data? Define or Describe Data.
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• What is Information? Define or Describe Information.
• What is System? Define or Describe System.
• What is Information Technology? Define or Describe IT. 
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• What is Digital Convergence? Define or Describe Digital Convergence.
• What is The Modern Scenario of IT? Define, Describe or Discuss Briefly The Modern Scenario of IT.
• What is Hardware? Define or Describe Hardware. 
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• What is Machine? Define or Describe Machine.
• What is Software? Define or Describe Software.
• What is Computer System? Define or Describe Computer System.
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• Briefly Describe Software and give its classification.
• What is Keyboard? Define or Describe Keyboard.
• Briefly Describe Pointing Devices used for input.
• Briefly Describe Scanning Devices?
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• Briefly Describe Audio / Video Input Devices.
• Briefly Describe Output Devices.
• Briefly Describe Types of Screens.
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• Briefly Describe Various Types of Printers and Plotters.
• Briefly Describe Sound Output.
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• Describe or Differentiate between System and Application Software?
• What is Computer Memory? How various types of data are represented in the memory.
• What is Computer Word? Explain word sizes.
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• What is System? What does it comprise of.
• Define SDLC? Give SDLC Diagram including various phases.
• Define SDLC? Explain SDLC with Diagram of various phases. 
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• Touch pad: The touch pad is a small, flat surface over which we slide our finger, using the same movements as we would with a mouse. As we move the finger, the cursor follows the movement.
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• We "click" by tapping the finger on the pad's surface or by pressing button positioned close by the pad. Touch pads are now common on the portable computers (laptops).
• Touch Screen: A touch screen is a video display screen that is sensitized to receive input from simply touching our fingers onto it.
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• It is covered with a plastic layer, behind which are invisible beams of infrared light. We simply touch the provided buttons or menus and get the information on the display screen accordingly.
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• Light Pen: The light pen is a light-sensitive stylus, or pen-like device, connected by a wire to the computer terminal. The user brings the pen to a desired point on the display screen and presses the pen button, which identifies that screen location to the computer. Engineers, graphic designers, and illustrators use light pens.
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• Digitizing/Graphic Tablet: A digitizing tablet consists of a tablet connected by a wire to a stylus or puck. A stylus is a pen-like device with which the user "sketches" an image. A puck is a copying device with which the user copies an image, such as an architectural drawing or a civil engineering map.
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• A puck looks a bit like a mouse but has different types of buttons and a clear plastic section extending from one end with crosshairs printed on it. The intersection of the crosshairs points to a location on the graphics tablet, which in turn is mapped to a specific location on the screen.
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