According to the contact between human body and vibrating source, vibrations are classified as which of the following?

• A. General
• B. Local
• C. Mixed
• D. General, Local, Mixed

Answer: (D)

When considering how vibrations interact with the body, the classification depends on where the contact occurs and how much of the body is involved. If the whole body is exposed through seating, standing on a vibrating surface, or other supports, it’s general (whole-body) vibration. If only a specific part in contact with the vibrating source is affected—like the hands gripping a tool or the feet on a vibrating platform—it’s local (localized) vibration. Some exposures involve both patterns, depending on how and where the body comes into contact with the source, which is called mixed. Because real-world scenarios can involve any of these contact patterns, the complete classification includes general, local, and mixed.