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Questions and Answers
What is the primary function of Optical Mark Recognition (OMR)?
Which technology allows for the conversion of printed documents into machine-readable text through scanning?
Which of the following describes Magnetic Ink Character Recognition (MICR)?
What input device is primarily utilized for reading barcodes on products?
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What is the main application of a scanner in document handling?
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What technique does MICR use for bank cheque processing?
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How is print quality usually measured in printers?
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Which type of printer generally has lower print quality?
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What is the primary difference between impact and non-impact printers?
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What alternative name is given to a computer monitor?
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Study Notes
Trackball
- A trackball is an input device that allows users to control the cursor or icon on a computer screen.
- Users control the trackball by rotating a pointing ball with their thumb, fingers, or palm.
- Trackballs resemble an inverted mouse.
Joystick
- A joystick is an input device that allows users to control the movement of the cursor or pointer on a computer screen.
- Joysticks are commonly used for playing video games.
Scanner
- A scanner is a device that optically scans images, text, handwriting, or objects and converts them into digital images.
- Scanners come in various types.
Optical Character Recognition (OCR)
- OCR is a process that converts text images into machine-readable text format.
- OCR technology allows users to easily edit scanned documents.
Optical Bar Code Reader (OBCR)
- OBCRs are input devices that read bar codes from products and transmit information to a computer.
Optical Mark Recognition (OMR)
- OMR is an electronic method for collecting data by identifying markings on a document.
- OMR is commonly used to grade multiple-choice tests and surveys.
Magnetic Ink Character Recognition (MICR)
- MICR is a character recognition technology that uses special magnetized ink.
- MICR is widely used in banking for processing checks.
Output Devices
- Output devices produce the results of processed input.
Printer
- A printer is a device that accepts input from a computer and outputs the information to paper.
- Printer quality is typically measured in dots per inch (DPI).
Impact Printers
- Impact printers use hammers, pins, or wheels to strike an inked ribbon and print onto paper.
- Impact printers generally have lower print quality than non-impact printers.
- Examples of impact printers include dot-matrix printers, daisy-wheel printers, and line printers.
Non-Impact Printers
- Non-impact printers use ink sprays, lasers, heat, and pressure to print.
- Non-impact printers generally produce higher quality prints than impact printers.
- Examples of non-impact printers include inkjet printers, laser printers, thermal printers, and 3D printers.
Monitors
- A computer monitor is an output device that displays information in pictorial or textual format.
- Also called a Visual Display Unit (VDU), the monitor displays the computer's user interface and open programs.
Technologies Used in Monitors
- Cathode Ray Tube (CRT)
- Liquid Crystal Display (LCD)
- Light-Emitting Diode (LED)
- Thin Film Transistor (TFT)
Plotter
- Plotters are used to print graphical output on paper.
- Plotters are capable of producing graphs, drawings, charts, maps, and other large graphics.
- There are two types of plotters: drum plotters and flatbed plotters.
Both Input and Output Devices
- Touchscreen
- Network Interface Card (NIC)
- Headset (Headphone + Microphone)
- Modem (Modulation + Demodulation)
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Description
This quiz covers various input devices, including trackballs, joysticks, scanners, and optical recognition technologies. Each device's function and use cases will be explored to enhance your understanding of how they work and their applications in everyday technology.
