Elevator Mechanic Practice Exam

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What is known as the silent killer?

Asbestos
CTW
Lead paint
Radon

The correct answer is: Asbestos

The term "silent killer" is commonly associated with radon. Radon is a colorless, odorless gas that occurs naturally from the decay of uranium in soil, rock, and water. It can accumulate in homes, particularly in basements and enclosed spaces. Exposure to high levels of radon over a long period is a significant health risk as it is linked to lung cancer, making it a silent but serious threat. In contrast, while asbestos and lead paint are also hazardous materials, they do not share the same characteristics as radon in terms of being a gas that silently accumulates and poses a long-term danger without immediate detection. Asbestos fibers can cause serious respiratory issues when inhaled, and lead paint is dangerous primarily due to its ingestion or inhalation during renovations, rather than being an invisible danger in the same way radon is. CTW (presumably referring to "Construction Tools and Workshop safety") does not typically fall under the category of a silent killer. Thus, radon's specific risks align closely with the notion of being a silent killer, as it can be present without any immediate indication, posing serious threats over time.