NCIDQ IDFX Practice Exam

What do window screen intrusion detection devices use to trigger an alarm?

1. Sound waves

2. Embedded fine wires

3. Magnetic fields

4. Infrared beams

The correct answer is: Embedded fine wires

Window screen intrusion detection devices typically utilize embedded fine wires to trigger an alarm. These devices work by incorporating a network of thin, conductive wires within the structure of the window screen. When an intruder attempts to cut, penetrate, or otherwise tamper with the screen, it disrupts the continuity of the electrical circuit formed by these wires. This disruption sends a signal to the alarm system, activating the alert. This method is favored for its effectiveness in detecting physical breaches without false alarms, as it specifically focuses on alterations made to the screen itself. Other options, while used in various security systems, do not play the primary role in window screen alarm technologies. For instance, sound waves might be used in certain types of perimeter alarms, magnetic fields are common in door sensors, and infrared beams are typically implemented in motion detectors, but none are as specifically suited for direct screen intrusion detection as embedded fine wires.