ITPEC FE Morning April 2019 Question 22

Which of the following is an appropriate example of utilizing an RFID?

a)Close range transmission of data using infrared raysb)Identification and management of personnel or items by using a very small wireless chipc)Input of information by using a reader to read a digital code that is printed on a paperd)Transmission of audio data between a cellphone and headphones

Explanation

Identifying and managing people or items with a tiny wireless chip — RFID reads an ID stored on a small chip over radio waves, without contact.

An RFID tag holds an IC chip and an antenna. A reader sends radio waves that power the tag (a passive tag has no battery) and reads its ID back, even through packaging and without line of sight. That suits staff ID cards, entry gates, inventory and asset tags, and contactless transit cards.

Answer (b)

Why not others:

•(a) — close-range transmission with infrared light is IrDA; RFID uses radio waves, not infrared
•(c) — reading a code printed on paper with a reader is a barcode or QR code; the code is optical and there is no chip
•(d) — sending audio between a cellphone and headphones is Bluetooth, a short-range radio link for streaming data between devices, not for identifying items

Key rule: Match the medium to the technology: a printed code read optically is a barcode, infrared is IrDA, a radio link between devices is Bluetooth, and an ID chip read by radio is RFID.

Computer Component · AI-written, may contain errors

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