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A gradual change of tone helps show which type of surface in a sketch?

Answer and explanation

Correct answer: A rounded or curved surface

The governing concept is continuous tonal modelling. On a rounded or curved surface, the plane turns gradually toward or away from the light, so the value changes progressively rather than stopping at one sharp boundary. This smooth transition creates the impression of volume and makes option D correct. A completely flat surface is more often shown with a relatively even tone, while a paper boundary is indicated by an edge, not gradual modelling.

Related tags

Gradual ToneCurved SurfaceShadingVolumePencil ShadingDrawing BasicsArt EducationClass 9 Mcq

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