A supermarket uses several electronic devices at... | Computer Science (9-1) 0984 | Paper 1 Mock 01 | Computer Systems

Question 1 Report

A supermarket uses several electronic devices at its checkout.

(a) Identify two input devices used at a supermarket checkout. For each device, describe how it is used. [4]

(b) Identify two output devices used at a supermarket checkout. For each device, state its purpose. [2]

Answer

Answer Details

(a) Two input devices used at a supermarket checkout: [4]

Barcode scanner/reader: this device uses a laser or LED to scan the barcode printed on each product's packaging. [1] The scanner reads the pattern of black and white bars, decodes it into a product number, and sends this code to the point-of-sale system, which looks up the product's name, price, and stock information in the database. [1]
Chip and PIN / contactless card reader: this device reads the data stored on a customer's bank card, either through the embedded chip (when the card is inserted) or via near-field communication (when the card is tapped). [1] It processes the electronic payment by communicating with the bank to authorise and complete the transaction. [1]

(b) Two output devices used at a supermarket checkout: [2]

Monitor/screen: displays the list of scanned items and their prices to both the cashier and the customer, along with the running total and final amount to pay. [1]
Receipt printer: prints a paper receipt listing all purchased items, their individual prices, the total cost, the payment method, and the date and time of the transaction. [1]

A supermarket uses several electronic devices at its checkout. (a) Identify two input devices used at a supermarket checkout. For each device, describe how ...