Final answer:
The statement is generally false; in engineering drawing, it's standard practice to omit features behind the cutting plane in a sectional view, which are not in direct line of sight. Option B is correct.
Step-by-step explanation:
The statement that 'All visible edges and contours behind the cutting plane should be shown' in technical drawings is generally false. In the context of engineering drawing, specifically in the creation of sectional views, the cutting plane is used to remove a portion of the object to reveal internal features that would otherwise be hidden.
However, it is standard practice to omit features that are behind the cutting plane and not in direct line of sight because they do not contribute to the sectional view intended to highlight internal details that are in the same plane as the cutting plane. Those edges and contours would typically be represented in other views of the drawing as required.
All visible edges and contours behind the cutting plane should be shown. This statement is False. When a cutting plane is used in a technical drawing or engineering design, it is meant to reveal the internal details of an object. Only the features that are cut or intersected by the cutting plane should be shown, while the hidden, non-visible edges or contours are typically omitted.