COMPUTER HARDWARE COMPONENTS FUNCTIONS
COMPUTER OUTPUT DEVICES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
It tells the color and size. information. It can tell the names and locations where the jeans are sold. It can give links to the store’s web site. All this inside a simple square.
|
|
|
It tells the store’s web site.
|
|
|
It detects if the barcode was scanned correctly.
|
|
|
The locations of where the item is sold.
|
Detailed explanation-1: -➢ The last number is called a check digit which enables the scanner to determine if the barcode was scanned correctly. Traditional barcodes systematically represent data by varying the widths and spacings of parallel lines, and may be referred to as linear or one-dimensional (1D).
Detailed explanation-2: -The last digit of a barcode number is a computer check digit which makes sure the barcode is correctly composed.
Detailed explanation-3: -In general, a barcode scanner “scans” the black and white elements of a barcode by illuminating the code with a red light, which is then converted into matching text.
Detailed explanation-4: -A barcode scanner (also referred to as a barcode reader) is a device that captures and decodes the information contained by a barcode.
Detailed explanation-5: -A reciprocating or oscillating mirror or rotating prism scans the laser beam back and forth across a barcode. A photodiode inside the scanner measures the intensity of light reflected back from the white spaces within the barcode and generates a specific frequency that translates into the digital information.