MTL2 Science Learner Outcome 2

What is the reference material used to calculate the relative density of solids and liquids?

• Air

• Copper

• Water

• Lead

Which of the following gases is heavier than air?

• Hydrogen

• Helium

• Methane

• Propane

What is the relative density of copper if its density is 8920 kg/m³?

• 0.892

• 8.92

• 892

• 89.2

Which material has a relative density less than 1 and is therefore lighter than water?

• Lead

• Polypropylene

• Brass

• Steel

What does a specific gravity of less than 1 indicate about a gas?

• It is heavier than air

• It is flammable

• It is lighter than air

• It is toxic

Which of the following is a pure metal commonly used in plumbing?

• Brass

• Copper

• Bronze

• Gun metal

What is the main difference between ferrous and non-ferrous metals?

• Ferrous metals are more expensive

• Non-ferrous metals contain iron

• Ferrous metals contain iron

• Non-ferrous metals are magnetic

Which alloy is made from copper and zinc and is commonly used for fittings?

• Bronze

• Gun metal

• Brass

• Stainless steel

Which of the following is a characteristic of ferrous metals?

• They do not rust

• They contain iron and form rust in air and water

• They are non-magnetic

• They are resistant to corrosion

Which plastic type can be reheated and reshaped multiple times?

• Thermosetting plastic

• Fibre glass

• Thermoplastic

• Thermoplastic