Pick up the incorrect statement from the following.
- AIn a king post truss, one vertical post is used
- BIn a queen post truss, one vertical post is usedCorrect
- CIn a queen post truss, two vertical posts are used
- DNone of these
Solution
Concept
Number of vertical posts in timber trusses
Step-by-step solution
1. King post truss: one central vertical post. 2. Queen post truss: two vertical posts. 3. The incorrect statement is "a queen post truss uses one vertical post".
Explanation
A king post truss has one vertical member (king post) in the middle and is used for spans up to about 8 m. A queen post truss has two vertical posts (queen posts) and is used for spans of about 8 to 12 m.
Shortcut
King = 1 post. Queen = 2 posts.
Common mistake
Marking a correct statement, since the question asks for the INCORRECT one.
Correct answer: B) In a queen post truss, one vertical post is used