MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -A barcode reader, also called a price scanner or point-of-sale (POS) scanner, is a hand-held or stationary input device used to capture and read information contained in a barcode.

Detailed explanation-2: -scanner, also called optical scanner, computer input device that uses a light beam to scan codes, text, or graphic images directly into a computer or computer system.

Detailed explanation-3: -The most common input devices are the keyboard, mouse, and touch screen.

Detailed explanation-4: -A Barcode reader or Barcode scanner is an electronic input device which is able to scan and decode barcodes. These devices use optical technology such as infrared light. Some readers use an integrated decoder, others have one unit for reading the barcode, and another one to decode the barcode.