Water purification


Which of the following substances is removed by filtration?


What is the name of the process that kills microbes during water purification?


Which process is used to make drinking water from seawater?


Which process uses high pressure and a porous membrane to purify water?


What is the name of the process used to purify water which involves boiling the water and then cooling it to condense the vapour?


The chart below shows the average water consumption of a particular household. What is the most effective way that the household could reduce its water consumption?

A pie chart showing household water consumption. Labelled are toilet 29%, washing machine 19%, shower 17%, tap 14%, washing up/dishwasher 9%, garden 6%, other 4% and bath 2%.


What are the three main processes of water purification in the correct order?


Which of the following is a disadvantage of adding fluoride to the drinking supply?


Desalination is commonly used to purify water in the Middle East. Which of the following is a reason why this method is suitable?


Using the information below, what is the percentage decrease in mean decayed, missing, and filled teeth (DMFT) in France between 1980-1990 and 2000-2009?

Bar chart comparing Mean DMFT over 2 decades, 1980 - 1990 and 2000 - 2009, in 9 countries. They are Finland, Switzerland, Netherlands, UK, Germany, Italy France, Spain and Ireland.