You are not sure if your water is clean. What can you do at home to make it safer?
AAdd a little sugar
BFreeze it solid
CStir it a lot
DBoil it and cool it
Answer & Solution
Correct answer: D. Boil it and cool it
Boiling kills the germs in water, so it is safer to drink after it cools.
Keep practising Human Needs
Browse all Human Needs questions for Olympiad (Class 4), or explore more Science topics.
Related questions
Clean toilets and clean drains are part of which basic need?Which clothes suit a hot desert day best?A healthy diet should have only a little of which foods?Which food helps you get fibre?To keep a healthy weight, the energy you eat should be about equal to what?What is done to sea water to make it fit to drink?Rivers, streams and glaciers are what kind of water source?A town tells people to boil water before use. Why?