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Questions and Answers

What is the primary purpose of an input device?

  • To display processed data
  • To receive data from the computer
  • To translate data into visual, auditory, or physical form
  • To provide data and control signals to a computer (correct)
  • Which of the following is NOT an example of an input device?

  • Monitor (correct)
  • Keyboard
  • Microphone
  • Mouse
  • What is the primary function of an output device?

  • To translate data into visual, auditory, or physical form (correct)
  • To enable users to communicate with the computer
  • To receive data from a computer
  • To provide data and control signals to a computer
  • Which of the following is NOT an example of an output device?

    <p>Keyboard</p> Signup and view all the answers

    Which type of key on a keyboard is used for navigating within a document or application?

    <p>Navigation keys</p> Signup and view all the answers

    What is the primary purpose of the function keys (F1-F12) on a keyboard?

    <p>To perform specific, pre-programmed functions</p> Signup and view all the answers

    Which type of key on a keyboard is used to enter letters and numbers?

    <p>Alphanumeric keys</p> Signup and view all the answers

    What is the purpose of the Shift, Ctrl, and Alt keys on a keyboard?

    <p>To modify the behavior of other keys</p> Signup and view all the answers

    What is the primary function of a sheet-fed scanner?

    <p>Feeding papers one at a time for scanning</p> Signup and view all the answers

    Which input device captures sound waves and converts them into an electrical signal?

    <p>Microphone</p> Signup and view all the answers

    What is the primary purpose of a webcam?

    <p>Video conferencing and live streaming</p> Signup and view all the answers

    Which input device is primarily used for photography and videography?

    <p>Digital camera</p> Signup and view all the answers

    How does a handheld scanner function?

    <p>Manually moving over the document</p> Signup and view all the answers

    What is the main difference between a digital camera and a webcam?

    <p>Digital camera is for photography, webcam for video conferencing</p> Signup and view all the answers

    Which input device allows users to interact with a digital display using touch gestures?

    <p>Touchscreen</p> Signup and view all the answers

    What is the common feature between sheet-fed and flatbed scanners?

    <p>'Feeding papers one at a time' feature</p> Signup and view all the answers

    Which of the following is NOT a way a printer can connect to a device?

    <p>Infrared</p> Signup and view all the answers

    What is the primary function of the DAC (Digital-to-Analog Converter) in a computer's sound card?

    <p>To convert digital audio data into an analog signal</p> Signup and view all the answers

    What is the primary purpose of a modem?

    <p>To convert digital data into a format suitable for transmission over analog communication lines</p> Signup and view all the answers

    What is the purpose of the modulation process in a modem?

    <p>To convert the digital signal from the computer into an analog signal for transmission</p> Signup and view all the answers

    What is the purpose of the demodulation process in a modem?

    <p>To convert the analog signal received over the telephone line into a digital signal for the computer</p> Signup and view all the answers

    Which of the following is NOT a function of a speaker in a computer's audio system?

    <p>Converts digital audio data into an analog signal</p> Signup and view all the answers

    What is the primary purpose of a combined input/output device like a modem?

    <p>To convert digital data into a format suitable for transmission over analog communication lines</p> Signup and view all the answers

    Which of the following is NOT a function of a modem's demodulation process?

    <p>Amplifies the incoming signal for better reception</p> Signup and view all the answers

    What is the primary advantage of touchscreens?

    <p>Allowing direct interaction with on-screen elements using fingers or a stylus</p> Signup and view all the answers

    Which of the following is an older display technology that uses electron guns to illuminate phosphors?

    <p>Cathode Ray Tube (CRT)</p> Signup and view all the answers

    What is the primary advantage of LED displays compared to regular LCDs?

    <p>Brighter images, better black levels, and more vibrant colors</p> Signup and view all the answers

    What is the term used to describe the number of pixels on a display screen?

    <p>Resolution</p> Signup and view all the answers

    Which of the following measures how quickly a pixel can change colors?

    <p>Response time</p> Signup and view all the answers

    What is the term used to describe how many times the screen is redrawn in a second?

    <p>Refresh rate</p> Signup and view all the answers

    Which of the following display technologies is known for being thinner and consuming less power than CRTs?

    <p>Liquid Crystal Display (LCD)</p> Signup and view all the answers

    What is the primary output device used with computers to present visual information?

    <p>Monitor or display screen</p> Signup and view all the answers

    What aspect ratio is commonly used for screens?

    <p>16:9</p> Signup and view all the answers

    What type of printer uses a laser beam to produce images on a drum?

    <p>Laser Printer</p> Signup and view all the answers

    Which printer type is known for high-speed printing and quality outputs?

    <p>Laser Printer</p> Signup and view all the answers

    What does DPI stand for in relation to printers?

    <p>Dots per Inch</p> Signup and view all the answers

    Which printer type uses liquid ink sprayed through tiny nozzles onto paper?

    <p>Inkjet Printer</p> Signup and view all the answers

    What key feature of a printer indicates the number of pages it can produce in a minute?

    <p>Printing Speed</p> Signup and view all the answers

    Which type of printer is commonly used for multi-part forms due to its ability to print through several layers of paper?

    <p>Dot Matrix Printer</p> Signup and view all the answers

    'Higher DPI values mean finer, clearer prints' - this statement is related to which key feature of a printer?

    <p>'Resolution'</p> Signup and view all the answers

    Study Notes

    Input and Output Devices

    • Input devices allow users to enter data into a computer and interact with it, while output devices display the processed input in a way that is easy for humans to understand.

    Output Devices

    • Monitor/Display Screen:
      • Types of display technologies: Cathode Ray Tube (CRT), Liquid Crystal Display (LCD), and Light Emitting Diode (LED)
      • Key features: Resolution (measured in pixels), Refresh Rate (measured in Hz), Response Time (measured in ms), and Aspect Ratio (width:height)
    • Printer:
      • Types of printers: Dot Matrix, Inkjet, and Laser
      • Key features: Resolution (measured in DPI), Speed (measured in pages per minute)
    • Speaker:
      • Converts digital audio data into an analog signal using the Digital-to-Analog Converter (DAC) in the sound card

    Input Devices

    • Keyboard:
      • Components: Alphanumeric keys, Function keys, Special keys, and Navigation keys
      • Connectivity: USB, Ethernet, Wi-Fi, or Bluetooth
    • Microphone:
      • Captures and converts sound waves into an electrical signal
      • Used for voice communication, recording, voice recognition, and more
    • Digital Camera and Webcam:
      • Both serve as imaging devices, but designed for different primary functions
      • Webcam: used for video conferencing, live streaming, and online communication
      • Digital Camera: used for photography and videography
    • Touchscreen:
      • A direct manipulation input device that allows users to interact with a digital display using touch gestures
    • Scanner:
      • Types: Sheet-fed and Handheld

    Combined Input/Output Devices

    • Modem:
      • Converts digital data from a computer into an analog signal for transmission over telephone lines
      • Converts incoming analog signal into a digital signal for the computer to understand and process
      • Modulation: converting digital signal into analog signal
      • Demodulation: converting analog signal into digital signal

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    Related Documents

    Week-3.pdf

    Description

    Test your knowledge about input and output devices in computer science. Learn about different types of input devices used to enter data, and how output devices display processed information for human understanding.

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