Timber MCQ with answer and solution

Concept

Standard moisture content for timber weight (IS 399:1963)

Step-by-step solution

1. IS 399-1963 (Classification of commercial timbers and their zonal distribution) specifies timber weight at a standard moisture content. 2. That standard value is 12%.

Explanation

IS 399:1963 lists the average weight of commercial timbers at 12% moisture content. A fixed moisture level is needed because timber weight changes with the water it holds.

Shortcut

Timber code number to remember: 12% moisture for weight and for standard strength tests.

Common mistake

Mixing up with the fibre saturation point (about 25–30%).