Which of the following types of timber is most suitable for outdoor construction, such as bridges and railway sleepers, due to its high resistance to decay and insects?
- ATeakCorrect
- BPine
- CCedar
- DOak
Solution
Concept
Timber selection for outdoor structural applications
Formula
NONE
Step-by-step solution
1. Timbers used for railway sleepers and bridges require high resistance to insects and biological decay. Answer: A
Explanation
Teak wood contains high levels of natural oils and resins that make it highly resistant to fungal decay, moisture, and insect damage. This exceptional natural durability makes teak ideal for demanding outdoor structural uses such as railway sleepers and bridges. Consequently, option A is the correct answer.
Why the other options are wrong
C) Cedar is lightweight and less suitable for heavy structural sleeper loads. D) Oak is a hardwood primarily used in interior carpentry and flooring.
Shortcut
Teak possesses high natural oils, providing superior resistance to decay and insects for outdoor structural timber.
Common mistake
Selecting Cedar or Oak (option C or D) based on general carpentry knowledge rather than Teak's standard civil engineering application for sleepers and bridges.
Correct answer: A) Teak