F5 HSB OFFLINE - 13th January 2022

Which of the following does NOT lead to eutrophication?

• sewage

• fertilizers

• batteries

• detergents

Which of the following gases DOES NOT contribute to global warming?

• Argon

• Carbon dioxide

• Water vapour

• Methane

Which of the following is an example of an industrial pollutant?

• oxygen

• heavy metals such as mercury

• sewage

• soap powder

The process labelled 1 in the picture is

• precipitation

• evaporation

• transpiration

• condensation

The process labelled 2 in the picture is

The process labelled 3 in the picture is

• precipitation

• evaporation

• transpiration

• condensation

The process labelled 4 in the picture is

Water that is safe to drink or to use in food preparation is called _________ water

• portable

• potable

• pure

• pipe

The diagram shows which technique of water purification that can be carried out at home?

• sedimentation

• chlorination

• filtration

• distillation

What does chlorination do to the water?

• removes microorganisms

• cleans water

• makes water taste nice

• removes twigs and sediment