Dome is defined as what architectural form?

• A. An arch rotated in plan to produce an inverted bowel-shaped form
• B. An outer weatherproof covering of a building in which the outer walls are non-structural
• C. A type of gypsum board used for ceilings
• D. A vertical load-bearing column system

Answer: (A)

Dome is defined as an arch rotated in plan to produce an inverted bowl-shaped form. By taking a curved arch and rotating it around a vertical axis, you create a continuous shell that spans space in multiple directions, forming that rounded, bowl-like exterior. This rotational surface of revolution is what gives a dome its distinctive, unified curvature and structural behavior, often allowing large interior spans without intermediate supports.

The other descriptions refer to different architectural concepts. An outer weatherproof covering with non-structural outer walls describes the building envelope or cladding rather than the form of a dome. A gypsum board used for ceilings is drywall or plasterboard, not a dome shape. A vertical load-bearing column system relates to a framing approach, not a curved shell.