Plumbing science

Brass is an alloy made from

• Copper and tin

• Zinc and copper

• Copper and aluminium

• Bronze and copper

The definition of an alloy is:

• It is magnetic

• It is a mixture of two or more metals

• It is always coloured silver

• The main property of the material is heat retention

Which of the following is a ferrous metal?

• Brass

• Copper

• Cast iron

• Aluminium

Ceramics are used for:

• Insulation on cold water pipework

• Kitchen cupboard doors for hygiene

• Sanitary appliances

• Filtration systems for swimming pools

Polybutylene can be used for:

• Guttering

• Downpipes

• Waste pipes

• Central heating pipes

Which of the following statements is true about a thermoplastic?

• When cold it can be brittle

• It remains soft and pliable at any temperature

• It cannot be recycled

• Once heated it cannot be re-shaped

Hardness describes the ability of a material to resist scratching, bending, abrasion and cutting.

• TRUE

• FALSE

The term 'conductivity' can refer to both electrical and thermal.

• True

• False