What type of detector detects an opening in a ceiling door or wall?

• A. Heat detector
• B. Smoke detector
• C. Perimeter detector
• D. Sound sensor

Answer: (C)

The type of detector that identifies an opening in a ceiling, door, or wall is a perimeter detector. This device is specifically designed to monitor the boundaries of an area and can detect unauthorized access or breaches at entry points. Perimeter detectors utilize various technologies, such as infrared sensors or motion detection, to sense movement or changes in the environment that indicate an opening or breach.

In contrast, a heat detector responds to increases in temperature, typically indicative of a fire, and is not designed to monitor physical openings. A smoke detector detects the presence of smoke particles in the air, primarily aimed at fire detection rather than monitoring structural integrity. A sound sensor, while capable of recognizing specific sounds, does not specifically target openings or breaches and would not provide the necessary functionality to monitor an entry point as effectively as a perimeter detector.