Alberta Security Guard License Practice Exam

What can be used to determine changes in temperature, such as fire behind a door?

1. Pressure sensors

2. Infrared cameras

3. Touch

4. Sound detectors

The correct answer is: Touch

The ability to determine changes in temperature, such as detecting fire behind a door, is best achieved using infrared cameras. These devices detect the infrared radiation emitted by objects based on their temperature, allowing security personnel to visualize heat sources and identify potential dangers without needing to open the door. While touch could potentially indicate heat (if the door is hot), it is far less reliable and poses a risk of burns or injury, making it unsuitable for effective safety measures. Pressure sensors and sound detectors do not directly measure temperature changes and would not provide reliable information specific to detecting heat from a fire. Infrared cameras are essential tools in safety and security scenarios for accurately assessing situations involving temperature variations.