Which of the following statements are correct regarding Radio Frequency Identification (RFID) technology?

1.RFID refers to a wireless system comprising two components, tags and readers

2.The reader is a device with one or more antennas that emit radio waves and receive signals back from the RFID tag

3.Passive RFID tags are powered by the reader and do not have a battery

A1, 2 & 3 ✓ Correct

B2 & 3 only

C1 & 3 only

D1 & 2 only

Correct answer: (A) 1, 2 & 3

Explanation

All three statements are correct because RFID is a two part wireless system, its reader uses antennas to exchange radio waves, and passive tags draw power from the reader.

Statement 1 holds because RFID pairs tags that store data with readers that query them wirelessly.

Statement 2 holds because a reader has one or more antennas that send out radio waves and receive the tag's reply.

Statement 3 holds because a passive tag has no battery and is energised only by the reader's signal.

An active tag, by contrast, carries its own battery and can transmit over a longer range.

RFID is widely used in access cards, toll tags, inventory tracking and animal identification.

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