Class 11 Computer 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.
• What is Information? Define or Describe Information.
• What is System? Define or Describe System.
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• What are Information / Computer Networks? OR Define Information / Computer Networks?
• Define or Describe Workgroup Computing.
• Define E-mail and Describe its Benefits.
• What are Benefits of E-mail.
• Define Internet and Describe its History.
• Define Data Communication and Describe its Five Components.
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• Define Signal, explain Analog and Digital Signals.
• Describe FIVE Types of Data.
• Describe Data Representation.
• Describe Uses of Computers in Business.
• Explain E-Commerce.
• Describe Use of Computers in Industry.
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• Describe Computer Aided Design (CAD) and Computer Aided Manufacture (CAM).
• Describe Computer Simulation.
• Describe Van Neumann’s Stored Program Computer.
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• Describe most important components of modern stored program machine.
• Describe Bus Interconnection and explain three types of bus.
• Describe Input / Output Unit.
• Define Security ? Describe the means to give access to authorized persons.
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• Describe the means through which virus propagates (reaches from one computer to the other).
• Describe important types of viruses.
• Describe the ways, How to safe guard against viruses.
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• Explain Data Security.
• Define OS (Operating System).
• Describe Types of OS (Operating System) on the basis of user interaction.
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• Give a tabulated comparison between a Command Line OS and a GUI OS.
• Explain The Purpose of Operating System.
• Explain The Objects of MS Windows Operating System.
• What is a Word Processor.
• What is a Simple Word Processor or Text Editor.
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• Explain Full-Featured Word Processor.
• Describe Basic Features of Spreadsheet Software.
• Describe Common Forms of Data Entered in a Cell.
• Describe Cell References and Ranges.
• Describe brief early history of the Internet.
• Describe how Internet Works.
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• Describe Addressing Scheme? Explain the two types of Addressing Schemes.
• Explain Web Browsing.
• Explain World Wide Web (WWW).
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• Describe or Explain The Major Personal or Business Benefits provided to users by Computers: Benefits To Computer Users : Computers linked through communications systems offer major personal and business benefit to users : Speed : Computer can perform calculations or process at a very high speed in nano second or pico second.
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• Computer can perform complex calculations, recall stored information, transmit information from one location to another and move objects around on a computer screen. Consistency : People often have difficulty repeating their actions. Computer excels at repeating actions consistently.
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• Whether using a spell checker built into a word processor or playing multimedia animation for training purposes, a computer will carry out the activity the same way every time. Precision : Computers are extremely precise and can detect minute differences that people cannot. Computers excel in managing the smallest differences in being precise. Reliability
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• Speed, consistency, and precision bring reliability. When we know that the same procedure will be followed rapidly, consistently, and precisely, we can expect reliability of result. We can depend on getting the same result again and again without any error. 
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• DMA (Direct Memory Access) : The processor issues I/O command and gets busy in other useful tasks. The special hardware gets the data from the I/O device and uses the system bus to place it in the main memory. When data is transferred, the processor does not need the system bus.
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• So, the processor does not have to wait for the I/O operation to complete. The disadvantage of this scheme is that it is more complex and extensive and more hardware is needed.
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