BT Y9 T2

Steel is formed when iron is combined with

• a.      Manganese

• b.      Water

• c.       Air

• d.      Carbon

The hardest form of steel is

• a.      Low carbon steel

• b.      Medium Carbon steel

• c.       High carbon steel

• d.      Iron ore

Iron is extracted from its ore by

• a.      Polishing the ore

• b.      Heating the ore

• c.       Freezing the ore

• d.      Digging up the ore

Which of the following chemicals is the most useful in iron extraction in the blast furnace?

• a.      Coal

• b.      Charcoal

• c.       Coke

• d.      Fanta

The naturally occurring mineral dug up that is made up of iron and some chemicals combined is called iron

• a.      Ore

• b.      Mixture

• c.       Metal

• d.      Stone

The most common defect in wood is

• a.      Upset grain

• b.      Cross grain

• c.       Shakes

• d.      Knots

Knot is a wood defect which occurs at a point where _________

• a.      Branches attach to trunk

• b.      Leaves attach to trunk

• c.       Roots attach to trunk

• d.      Bark peels off

The stress applied on a tree while it is still growing leads to the formation of

• a.       Upset grain

• b.      Shakes

• c.       Knot

• d.      Cross grain

The insect attack on a growing tree is a type of

• a.       Natural defect

• b.      Sap sucking

• c.       Annual ring

• d.      Artificial defect

Which of the following manufacture board is made from compressed sawdust?

• a.      Hard board

• b.      Laminated core

• c.       Chip board

• d.      Ply wood