A wooden block hinged on post outside a door, is known

Solution(By Examveda Team)

A wooden block hinged on a post outside a door is known as a Stop. The purpose of a stop is to prevent the door from swinging too far and damaging the wall or frame. It is usually placed in a position where it can restrict the movement of the door, ensuring it only opens to a specific point.
Option A: Cleat is incorrect because a cleat is used for securing ropes or cords and is not a component found outside a door to control its swing.
Option C: Horn typically refers to a projection on a door frame or window sash, not a hinged block outside the door.
Option D: None of these is incorrect because the correct term is "Stop" for a wooden block hinged outside a door.
Therefore, the correct answer is Option B: Stop.