Question

For precision work like writing or electronic assembly, what should be the height of the work surface ?

• A. 20-40 cm above the elbow height
• B. 5 cm above the elbow height
• C. 15 cm below the elbow height
• D. 30 cm below the elbow height

Hint:

For precision tasks, think "higher than the elbow" to reduce eye strain and support the forearms. For heavy physical tasks, think "lower than the elbow" to leverage body weight.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Ergonomics in the workplace defines the height of work surfaces relative to the user's elbow height to minimize muscular strain in the neck, shoulders, and back.

Step 2: Detailed Explanation:
The recommended height of a work surface varies depending on the type of task being performed:

• Precision Work (e.g., writing, fine drawing, electronic assembly): Requires close visual focus and support for the forearms. The surface should be slightly above elbow height (typically \(5\text{ to }10\text{ cm}\) above the elbow) to bring the work closer to the eyes and allow the arms to rest comfortably.

• Light Work (e.g., typing, food preparation): The surface should be slightly below elbow height (typically \(5\text{ to }10\text{ cm}\) below).

• Heavy Work (e.g., manual assembly, cutting, heavy handling): Requires downward force, so the surface should be significantly below elbow height (typically \(15\text{ to }30\text{ cm}\) below).
Among the options, "5 cm above the elbow height" is the correct ergonomic choice for precision work.

Step 3: Final Answer
The height of the work surface for precision work should be 5 cm above the elbow height.