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This is the plane upon which the top view is projected:

Horizontal
Frontal
Profile
Base

Correct Answer: Horizontal

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More Questions from Orthographic Projection

In orthographic views, dashed lines represent features that would be hidden behind other surfaces.
The profile plane is the plane upon which the side view is projected.
A plane surface that is parallel to a plane of projection appears on edge as a straight line.
Usually screws, bolts, shafts, tubes, and other elongated parts are drawn in a vertical position in the front view.
If an edge is perpendicular to a plane of projection, it appears as a point.
The depth dimensions in the top and side views do not necessarily correspond.
If an angle is in an inclined plane, it may be projected either larger or smaller than the true angle depending on its position.
A plane surface always projects either on edge or as a surface in any view.
Any principal view shows three of the four principal dimensions.
First-angle projection is primarily used in Europe and Asia.

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