Ph 1 303 Scientific principles

Describe an alloy.

• Very light metal

• Mixture of two or more metals

• Aluminium

• Metal specifically used for electrical fittings

What is the specific gravity of butane in relation to air?

• 0.6

• 1

• 2

• 1.5

What material is a sacrificial anode typically made of?

• Magnesium

• Lead

• Copper

• Aluminium

Name the process of protecting steel from rusting by coating it with a thin layer of zinc.

• Dezinicification

• Electrolysation

• Galvanisation

• Oxidisation

What is the scientific name given for the rainwater cycle?

• Urban cycle

• Hydrological cycle

• Water table

• H₂O

When water is turned into steam, approximately how much will be produced from 1m³ of water?

• 10m³

• 16m³

• 160m³

• 1,600m³

What numbers identify the pH of pure water on the potential hydrogen scale?

• 12

• 1

• 6–7

• −273

At what temperature is water when at its most dense?

• −10°C

• 0°C

• 2°C

• 4°C

Which law states; as the temperature of a quantity of gas at constant pressure increases, the volume of gas increases. As the temperature goes down, the volume decreases.

• Boyle’s law

• Cole’s law

• Charles’s law

• The Gas law

Which ancient mathematician designed a simple screw-type mechanism which, when rotated, can lift water from a lower to a higher level?

• Einstein

• Archimedes

• Plato

• Grunfoss