Which of the following statements are correct regarding Radio Frequency Identification (RFID) technology? A. RFID refers to a wireless system comprising two components: tags and readers. B. The reader is a device that has one or more antennas that emit radio waves and receive signals back from the RFID tag. C. Passive RFID tags are powered by the reader and do not have a battery. Choose the correct answer from the options given below.
Understanding Radio Frequency Identification (RFID) Technology
Radio Frequency Identification (RFID) is a widely used technology for automatic identification and data capture. It employs radio waves to wirelessly identify objects or people. Let's examine the statements provided regarding RFID technology.
Analyzing the Statements on RFID
Let's break down each statement to determine its accuracy:
- Statement A: RFID refers to a wireless system comprising two components: tags and readers.
This statement accurately describes the fundamental structure of an RFID system. At its core, an RFID setup consists of an RFID tag (which holds the data) and an RFID reader (which reads data from or writes data to the tag).
- Statement B: The reader is a device that has one or more antennas that emit radio waves and receive signals back from the RFID tag.
This statement correctly explains the function of an RFID reader. The reader generates a radio frequency magnetic field through its antenna. When an RFID tag enters this field, it is activated (in the case of passive tags) and can communicate data back to the reader via radio waves.
- Statement C: Passive RFID tags are powered by the reader and do not have a battery.
This statement is a key characteristic distinguishing passive RFID tags from active tags. Passive tags draw the energy needed to operate directly from the radio waves emitted by the RFID reader's antenna. They do not contain their own power source like a battery.
Conclusion on Statement Correctness
Based on the analysis:
- Statement A is correct: RFID systems primarily consist of tags and readers operating wirelessly.
- Statement B is correct: The reader's role involves emitting radio waves and receiving tag signals.
- Statement C is correct: Passive RFID tags are indeed powered by the reader and lack an internal battery.
Therefore, all three statements (A, B, and C) are correct descriptions of aspects of Radio Frequency Identification (RFID) technology.
| Component/Type | Description |
|---|---|
| RFID Tag | Contains data, typically attached to an item to be tracked. |
| RFID Reader | Communicates wirelessly with tags, emitting radio waves and receiving data. |
| Passive RFID Tag | Powered by the reader's signal; no internal battery. |
| Active RFID Tag | Has its own battery; can transmit data over longer distances. |
Revision Table: Key RFID Concepts
| Concept | Description |
|---|---|
| RFID System | Wireless identification using radio waves. |
| RFID Tag | Data carrier (microchip + antenna). |
| RFID Reader | Device to read/write tag data. |
| Wireless Communication | Data transfer without physical connection using radio waves. |
| Passive Tag Power | Energy harvested from reader field. |
Additional Information: Types of RFID Tags
Beyond passive tags, there are other types of RFID tags:
- Active RFID Tags: These tags have their own battery power source. This allows them to transmit data over longer distances and often store more information than passive tags.
- Semi-Passive (Battery-Assisted Passive) RFID Tags: These tags use a battery to power the microchip but rely on the reader's signal to initiate communication. This offers better range than passive tags while still being more power-efficient than active tags.
The choice between passive, active, or semi-passive tags depends on the specific application's requirements for read range, data capacity, and cost.
Important Questions from Mediums of ICT Instruction - Teaching
Given below are two statements:
Statement I: Use of programmed instructional material as supplement has the potential to optimise learning outcomes.
Statement II: ICT, if used, judiciously will render teaching-learning systems effective and efficient.
In the light of the above statements, choose the most appropriate answer from the options given below:
In which of the methods of teaching ICT support is implied?
Given below are two statements:
Statement I: Minimum number of bits required to store any 3-digit decimal number is 10.
Statement II: The data in a digital computer is stored in terms of bits/ bytes where one Peta Byte is equal to 2 50 bits.
In the light of the above statements, choose the correct answer from the options given below:
