Which of the following can cause off-duty noise hazards leading to hearing loss?

The correct answer is lawn equipment and power tools. These tools are often designed to perform hard, noisy tasks such as cutting grass or shaping materials, and they can produce sound levels that exceed safe exposure limits. This means that consistent or prolonged exposure to such noise without proper hearing protection can lead to noise-induced hearing loss over time.

In contrast, office work, sitting in silence, and typing on a computer generally do not create hazardous noise levels. Office environments usually feature sound levels that are manageable and within recommended limits for safe auditory exposure. Conversely, silence has no noise hazards associated with it, and typing on a computer typically generates minimal sound. Therefore, these activities are less likely to contribute to hearing loss compared to operating loud machinery or equipment.