DT 4

Question 1

State the two types of natural timber

Answer 1

Hardwoods
Softwoods

Question 2

Properties of hardwoods (4)

Answer 2

Hard, strong, expensive, grows slowly

Question 3

Properties of softwood (4)

Answer 3

Softer, lighter, cheaper, grows faster

Question 4

Examples of hardwood (3)

Answer 4

Oak, Mahogany, Beech

Question 5

Examples of softwood (3)

Answer 5

Pine, Cedar, Spruce

Question 6

Common uses of hardwood (3)

Answer 6

Furniture, floors, doors

Question 7

Common uses of softwood (3)

Answer 7

Construction, cheap furniture, fences

Question 8

Define the process of seasoning Timber

Answer 8

Removing moisture (water) from timber after cutting

Question 9

Reason to season timber

Answer 9

Prevents wood from warping (bending/twisting)
Stops cracking and shrinking
Makes it stronger and more stable

Question 10

State the two ways to season timber

Answer 10

Natural seasoning
Kiln seasoning

Question 11

Define natural seasoning

Answer 11

Letting wood dry slowly outdoors (takes months)

Question 12

Define kiln seasoning

Answer 12

Using a hot oven (kiln) to dry quickly (takes days)

Question 13

Reason to steam the timber

Answer 13

Heat and moisture make wood soft and flexible,
Then you can bend it into curves or shapes.

Question 14

How to steam the timber

Answer 14

Timber is put in a steam box ➔ absorbs steam ➔ bent over a mould ➔ cooled to set shape

Question 15

State the different Adhesives (Glue) for Timber (2)

Answer 15

PVA glue (Polyvinyl acetate)
Epoxy resin

Question 16

State the properties of PVA glue (2)
(Polyvinyl acetate)

Answer 16

Sets in a few hours.
Not waterproof unless special type.

Question 17

State the properties of Epoxy resin (4)

Answer 17

Very strong
Waterproof
Chemical-resistant.
Takes longer to cure (about 24 hours fully).

Question 18

State the different types of Manufactured Boards (5)

Answer 18

Plywood
Blockboard
Chipboard
Hardboard
MDF (Medium Density Fibreboard)

Question 19

Properties of plywood (2)

Answer 19

Strong (layers with grains crossed), stable

Question 20

Properties of Blockboard (1)

Answer 20

Core of strips of wood between sheets

Question 21

Properties of Chipboard (2)

Answer 21

Made from wood chips and glue

Question 22

Properties of Hardboard (2)

Answer 22

Very thin, dense board from wood fibres

Question 23

Properties of MDF (3)
(Medium Density Fibreboard)

Answer 23

Very smooth, easy to cut, dense

Question 24

Common uses of Plywood (2)

Answer 24

Furniture, floors

Question 25

Common uses of Blockboard (2)

Answer 25

Doors, shelves

Question 26

Common uses of Chipboard (1)

Answer 26

Cheap furniture

Question 27

Common uses of Hardboard (2)

Answer 27

Back of wardrobes, drawer bottoms

Question 28

Common uses of MDF (2) (Medium Density Fibreboard)

Answer 28

Cabinets, doors

Question 29

Advantages of Manufactured Boards (4)

Answer 29

Cheaper than solid wood Available in large, flat sheets No knots or natural defects Stable — less likely to warp

Question 30

Disadvantages of Manufactured Boards (4)

Answer 30

Not as strong as solid wood Can absorb moisture and swell Edges can be rough and need covering Heavier (especially MDF)