IB DP DT Topic 4.2 b Timbers

There are two main categories of natural timbers. They are ...

• Softwoods and Hardwoods

• Angiosperms and Gramyosperms

• Deciduous and Broadleaf

• Coniferous and Needle leaf

Softwoods are characterised by their cones and their needle leaves.

• True

• False

Hardwoods are characterised by their broad leaves and their knotty wood.

• True

• False

Hardwood trees are slower growing, making the timber sourced from them more expensive.

• True

• False

Which of the following is a list of Manufactured boards?

• MDF, HDF, Particle board

• HDF, SDF, Chipboard

• Plywood, MDF, SDF

• Plywood, HDF, SDF

Plywood is created by gluing thin layers together at 90degrees to each other to improve mechanical strength.

• True

• False

Timbers can have special finished applied to prevent insects attacking and eating them.

• True

• False

Timbers can not be treated to prevent fungus.

• True

• False

Manufactured boards come in regular sizes. An example of the sizes is ...

• 2440mm x 1120mm, 3mm thick

• 2240mm x 1120mm, 4mm thick

• 2440mm x 1220mm, 6mm thick

• 2540mm x 1220mm, 7mm thick

MDF is a manufactured board with the following features ...

• Smooth surface, easy to work with, water resistant.

• Easy to work with, paints easily, can be made water resistant.

• Hard to cut, chips easily, won't be painted.