Question

Trackball is which of the following devices?
1. Barcode reader
2. Touchpad
3. Output device
4. Input device

Answer 1

Correct Answer - Option 4 : Input device

The correct answer is an Input device.

• A trackball is an Input device.
  • A trackball is a pointing device consisting of a ball held by a socket containing sensors to detect a rotation of the ball about two axis -
    • like an upside-down mouse with an exposed protruding ball.
  • A trackball is an input device used to enter motion data into computers or other electronic devices.
  • A trackball is essentially a different kind of computer mouse.
  • It is a plastic case containing a ball on the top that moves a computer cursor around on the screen.
  • The user can move the ball with their thumb or fingers, and sensors inside the case detect which direction the ball is moving.
  • A trackball is a computer cursor control device used in many notebook and laptop computers

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• Barcode reader :
  • A barcode reader is an optical scanner that can read printed barcodes, decode the data contained in the barcode and send the data to a computer.
    • Like a flatbed scanner, it consists of a light source, a lens, and a light sensor translating for optical impulses into electrical signals.
  • A barcode scanner will read this pattern of black and white bars and translate them into a line of test that your retail point of sale system can understand.
• Touchpad :
  • The touchpad on a laptop does the same job as the mouse on a desktop PC.
  • It is sometimes also called a trackpad.
  • The touchpad is used to control the mouse pointer, also known as the cursor.
  • The cursor is used to point to and choose items on the screen.
• Output device :
  • Any information that is processed by and sent out from a computer or other electronic device is considered output.
  • An output device is any piece of computer hardware equipment that converts information into human-readable form.
  • It can be text, graphics, tactile, audio, and video.
  • Some of the output devices are Visual Display Units i.e. a Monitor, Printer, Graphics Output devices, Plotters, Speakers.