Correct option is C
Centre lines and section lines are generally drawn using hard pencils like 3H or 4H to ensure they are fine, precise, and lightly visible.
Hard pencils produce thin, sharp lines that are suitable for technical and detailed drawings.
Explanation of Pencil Grades:
3H or 4H: These pencils are hard and are used for light, fine, and precise lines, making them ideal for center lines and section lines.
H (Option a): Produces slightly thicker and darker lines compared to 3H or 4H, suitable for dimension lines or construction lines.
HB (Option d): A softer pencil, used for general writing or dark outlines, not for fine lines.
Application in Engineering Drawing:
Centre lines and section lines require precision and clarity, which is achieved by using harder pencils like 3H or 4H.
