What is required for iron to rust?
Oxygen and heat
Water and oxygen
A catalyst and heat
Which metal could be used for sacrificial protection of iron?
Tin
Lead
Magnesium
Which of the following is an alloy?
Copper
Steel
Which property of aluminium is important for explaining its use in overhead electrical cables?
Low density
High thermal conductivity
Malleable
Why is gold used to plate the plugs that connect speaker cables to a stereo amplifier?
High melting point
Good conductor of electricity
High density
Which of the following materials is most likely to be transparent?
Glass ceramic
Clay ceramic
Metal
Which of the following materials is the best conductor of heat?
Which of the following is a composite material?
Fibreglass
Polymer
Why is carbon fibre reinforced polymer used in the body panels of high performance cars?
It is stiff, strong and lightweight
It is cheaper than steel or aluminium
It does not corrode
Which type of polymer can be remelted and therefore recycled?
Thermosoftening polymer
Thermoshaping polymer
Thermosetting polymer