ITPEC FE Morning October 2020 Question 72

Stain-resistant, and readable from outside the package — an IC tag is read by radio, so the reader needs neither contact nor a clean printed surface.

An IC tag (RFID) holds a small IC chip and an antenna. A reader queries it by radio and reads the ID and data stored in the chip. Because nothing is printed and nothing has to touch, the tag can be sealed inside a package, still works when dirty, and several tags can be read at once, which are its advantages over a barcode.

Answer (b)

Why not others:

• •(a) — the data is held in the tag's own chip memory, which is small; no external storage device is attached
• •(c) — inserting a card into a magnetic reader describes a magnetic stripe card; RFID is contactless and uses radio, not magnetism
• •(d) — an RFID tag has no GPS function; finding and showing the current location is what a GPS receiver does

Key rule: RFID means contactless radio reading of data held in the tag's chip: it works through packaging and dirt and can read many tags at once.

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