Pick up the incorrect statement from the following: A. In king post truss, one vertical post is used B. In a queen post truss, one vertical post is used C. In a queen post truss, two vertical posts are used D. None of these

The correct answer is: A. In king post truss, one vertical post is used.

A king post truss is a type of truss that uses two vertical posts, called king posts, to support the weight of the roof. The king posts are connected to the top and bottom chords of the truss by diagonal braces. The queen post truss is a type of truss that uses two vertical posts, called queen posts, to support the weight of the roof. The queen posts are connected to the top and bottom chords of the truss by diagonal braces, and they are also connected to each other by a horizontal member called a collar beam.

The incorrect statement is that a king post truss uses one vertical post. This is not true, as a king post truss uses two vertical posts.