A covering of concrete placed on the exposed top of an external wall, is known as A. Cornice B. Coping C. Frieze D. Lintel

The correct answer is B. Coping.

A coping is a covering of concrete or stone placed on the exposed top of an external wall to protect it from the weather. It is usually sloped to shed water away from the wall.

A cornice is a decorative molding that projects from the top of a wall or building. It is often used to conceal the junction between the wall and the roof.

A frieze is a horizontal band of decorative sculpture or painting that is located between the cornice and the architrave.

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