Exposed portions of vertical surface at right angles to the door or window frame, are known as A. Jambs B. Lintels C. Reveals D. Soffits

The correct answer is: C. Reveals

A reveal is the exposed portion of a vertical surface at right angles to the door or window frame. It is the space between the frame and the wall. Reveals can be used to add visual interest to a room, and they can also be used to hide imperfections in the wall.

A jamb is the vertical side of a door or window frame. It is the part of the frame that the door or window swings on.

A lintel is a horizontal beam that supports the weight of the wall above a door or window opening.

A soffit is the underside of an architectural element, such as an eave or a cornice.