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CCSP · Question #150
CCSP Question #150: Real Exam Question with Answer & Explanation
The correct answer is B: Ionization. Ionization smoke detectors operate by using a small amount of radioactive material to ionize the air between two electrically charged plates, detecting smoke when it disrupts the current.
Submitted by tunde_lagos· Apr 18, 2026Cloud Platform & Infrastructure Security
Question
There are two general types of smoke detectors. Which type uses a small portion of radioactive material?
Options
- APhotoelectric
- BIonization
- CElectron pulse
- DIntegral field
Explanation
Ionization smoke detectors operate by using a small amount of radioactive material to ionize the air between two electrically charged plates, detecting smoke when it disrupts the current.
Common mistakes.
- A. Photoelectric smoke detectors work by using a light source and a photosensitive sensor; smoke interferes with the light beam or scatters light into the sensor, triggering the alarm, and do not use radioactive material.
- C. Electron pulse is not a standard type of smoke detector.
- D. Integral field is not a standard type of smoke detector.
Concept tested. Types of smoke detectors
Reference. https://www.cpsc.gov/safety-education/safety-guides/home/smoke-alarms
Topics
#Smoke detectors#Physical security#Environmental controls#Ionization detectors
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