Which device is used to automatically detect fire and raise the alarm?

• A. Smoke detector
• B. Manual call point
• C. Fire extinguisher
• D. Fire blanket

Answer: (A)

The device that automatically detects fire and raises the alarm is the smoke detector. It continually monitors the air for smoke particles, and when a threshold is reached, it sends a signal to the fire alarm system to trigger audible and visual alarms. This automatic detection is what enables fast early warning and evacuation.

A manual call point requires someone to push it to raise the alarm, so it’s not automatic. A fire extinguisher and a fire blanket are for extinguishing or containing a fire, not for sensing and signaling a fire to others. Smoke detectors can be of different types, such as ionization or photoelectric, but both aim to detect smoke and activate the alarm system quickly.