A timber column with twisted fibre and perfect end conditions fails at a load significantly below Rankine prediction. The dominant reason is:

Which defect MOST severely violates the assumption used in Euler buckling theory for timber columns?

A timber beam with diagonal grain fails at a lower load even though bending stress is within permissible limits. The hidden cause is:

A timber column fails at a load much lower than Euler’s predicted buckling load, despite having no cracks or decay. The MOST probable defect is:

Which of the following defects can exist without significantly reducing initial strength, but drastically reduce durability?

Foxiness, Druxiness, Chemical stain

A timber specimen shows no cracks, no knots, no decay, yet fails suddenly in compression. The MOST defensible explanation is:

A timber appears externally sound but turns powdery internally when drilled. This damage pattern indicates attack by:

Which defect MOST directly indicates that compressive stresses exceeded wood fibre resistance during the tree’s life?

Consider the statements:

1. Foxiness reduces the aesthetic value of timber more than its structural strength.

2. Druxiness may remain undetected until the timber is cut open.

Which is correct?