Water purification

1

Which of the following substances is removed by filtration?

2

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

3

Which process is used to make drinking water from seawater?

4

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

5

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

6

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%.

7

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

8

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

9

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

10

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.