Defects in timber and market forms of timber

Due to uneven shrinkage, the wood sometimes flattens during drying. This type of defect in timber is known as

• Honey combing
• collapse
• warp
• twist

Piece of timber spirally distorted along its length. This type of defect in timber is known as

• split
• twist
• casehardening
• warp

Defect indicated by the curvature formed along the transverse direction of timber

• cup
• bow
• radial shke
• collapse

Thickness of vaneers varies from

• 0.4 to 6mm
• 0.6 to 6mm
• 0.4 to 4mm
• 0.4 to 0.6mm

vaneers are placed in ............. Numbers are placed one above another in plywoods

• Odd
• even
• either odd or even
• multiples of 3

Phenol formaldehyde resin used in

• block board

• compreg timber

• Lamin board

• Impreg timber

Druxiness is a defect due to

• Natural forces
• Fungi
• Improper seasoning
• Conversion

Case hardening is a defect due to

• Natural forces
• Fungi
• Improper seasoning
• Conversion

Torn grain is a defect due to

• Natural forces
• Fungi
• Improper seasoning
• Conversion

Dead wood is a defect caused due to

• Natural forces
• Fungi
• Improper seasoning
• Conversion