Multiple choice

Codes consisting of light and dark marks which may be optically read are known as

  1. mnemonics

  2. bar codes

  3. decoders

  4. instructions

  5. All of the above

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bar code is a group of light and dark marks that are put on the product so that computer can come to know about the price and other information about the product. It is read optically by a device called bar code reader.