Q.92 Which of the following is manufactured from particles of wood or other lignocellulose materials, which are agglomerated, formed and pressed together using an organic binder together in the presence of heat, pressure or moisture?
- ABlock board
- BParticle boardCorrect
- CPlywood
- DFibre board
Solution
Concept
Particle board is made by pressing wood particles together with an organic binder using heat, pressure or moisture.
Step-by-step solution
1. Note the key words: 'particles of wood', 'agglomerated', 'organic binder', 'heat and pressure'. 2. Block board has a core of wooden strips with veneers glued on the faces. 3. Plywood is made of thin veneers glued with the grain at right angles. 4. Fibre board is made of wood fibres that are felted, and the bond comes mainly from the felting of the fibres. 5. Pressing wood particles with a binder describes particle board, option B.
Explanation
Particle board is made from small wood chips or particles mixed with a resin binder. The mix is formed into mats and pressed with heat and pressure. The question's definition matches particle board exactly.
Why the other options are wrong
A: Block board has a core of solid wood strips between veneers, not particles. C: Plywood is made of glued veneer sheets, not particles. D: Fibre board uses felted wood fibres, and its bond comes mainly from fibre interlocking.
Shortcut
Key word 'particles' leads to particle board. 'Fibres' leads to fibre board. 'Veneers' leads to plywood.
Common mistake
Confusing particle board with fibre board because both use wood waste and pressing.
Correct answer: B) Particle board