for mock22/1

• Why are input and output devices designed?

  For a specific purpose in mind
• What is the primary function of a barcode?

  To uniquely identify products
• What is a QR code?

  A modern 2D barcode for complex information
• How do barcode readers extract information?

  By reading encoded data in barcodes
• What are the four main types of barcode readers?

  1. Pen style readers
  2. Laser scanners
  3. CCD readers
  4. Camera-based readers
• How does a pen style barcode reader work?

  It drags across the barcode to read
• What does a laser scanner use as a light source?

  A laser
• What is the advantage of laser scanners over pen style readers?

  They can read barcodes from various angles
• What do CCD readers consist of?

  An array of tiny light sensors
• How do camera-based readers decode barcodes?

  Using image processing software
• What types of sensors do digital cameras use?

  CCDs and CMOS sensors
• What is a key advantage of CMOS sensors?

  Lower power consumption
• How does a digital camera convert an image into digital format?

  By measuring brightness of pixels
• Why are green filters used more in digital cameras?

  To match human vision more accurately
• How does a laser printer operate?

  • Uses powdered ink in cartridges
  • Generates a bitmap of the image
  • Negatively charges the print drum
  • Uses a laser to create a reverse image
  • Fuses toner to the page with heat and pressure
• What is the maximum quality of a laser printer?

  1200 dpi
• What is the difference between active and passive RFID tags?

  Active tags have an onboard battery
• How far can RFID tags be read?

  Up to 300 meters
• What do passive RFID tags rely on for power?

  Radio waves from the reader
• What is a common use for RFID tags?

  Tracking products and animals
• What are the main characteristics of input and output devices?

  • Characteristics: Functionality, design, and technology
  • Purposes: Data input, output, and processing
  • Suitability: Based on specific applications