How to purify water by boiling
  • 1. What is the primary purpose of boiling water for purification?
A) To kill harmful microorganisms
B) To improve the taste
C) To add minerals
D) To remove sediment
  • 2. At what temperature does water typically need to boil to be purified?
A) 75°C (167°F)
B) 150°C (302°F)
C) 100°C (212°F)
D) 50°C (122°F)
  • 3. How long should water be boiled to ensure effective purification?
A) 15 seconds
B) 1 minute
C) 30 seconds
D) 5 minutes
  • 4. In mountainous areas, should the boiling time be increased or decreased?
A) Stay the same
B) Depends on humidity
C) Increased
D) Decreased
  • 5. Why is longer boiling time required at higher altitudes?
A) The air is less dense
B) The water is purer
C) Water boils at a higher temperature
D) Water boils at a lower temperature
  • 6. What type of container is best for boiling water?
A) Stainless steel
B) Aluminum
C) Cardboard
D) Plastic
  • 7. What should you do before boiling water for purification?
A) Add sugar
B) Filter out sediment
C) Add salt
D) Chill the water
  • 8. Does boiling water remove chemical contaminants?
A) Yes, all of them
B) Yes, most of them
C) Yes, only chlorine
D) No
  • 9. What should you do after boiling the water?
A) Add lemon
B) Let it cool down
C) Drink it immediately
D) Add ice
  • 10. What organisms are effectively killed by boiling?
A) Pesticides
B) Bacteria and viruses
C) Microplastics
D) Heavy metals
  • 11. Can boiling water remove taste or odor issues?
A) Yes, always
B) No, never
C) Only bad odors
D) Sometimes
  • 12. What is the best way to store boiled water?
A) In an open container
B) In the refrigerator uncovered
C) In a clean, sealed container
D) In direct sunlight
  • 13. For how long is boiled water generally considered safe to drink?
A) 1 month
B) Indefinitely
C) 1 week
D) 24 hours
  • 14. What fuel source is suitable for boiling water?
A) Only wood
B) Only electricity
C) Only gas
D) All of the above
  • 15. How does water look when it's boiling?
A) Steaming gently
B) Bubbling vigorously
C) Still and clear
D) Frothy on top
  • 16. If you only have slightly cloudy water, is boiling enough?
A) Yes, boiling makes it safe
B) No, it's not safe
C) Boiling is better after filtering
D) Cloudiness is irrelevant
  • 17. What if the water source is suspected to be heavily contaminated with chemicals?
A) Boiling will remove all contaminants
B) Boiling is not sufficient
C) Just boil it longer
D) Boil it twice
  • 18. What does "purification" mean in the context of water?
A) Removing harmful substances
B) Adding flavors
C) Making it colder
D) Changing the color
  • 19. Does boiling soften hard water?
A) Yes, completely
B) No, never
C) Makes it harder
D) Partially
  • 20. Can you use a microwave to boil water for purification?
A) Yes, but it may not be as effective
B) Only if it has a special setting
C) No, never
D) Yes, it's the best method
  • 21. Why might microwave boiling be less effective?
A) Uneven heating
B) Faster boiling
C) Higher temperature
D) It's more energy-efficient
  • 22. What is the relationship between water hardness and boiling?
A) Boiling has no effect on hardness.
B) Hardness prevents boiling.
C) Boiling reduces some hardness.
D) Boiling increases hardness.
  • 23. What is the first step when purifying water from an unknown source?
A) Add chlorine.
B) Boil the water.
C) Locate the water source.
D) Filter the water.
  • 24. What is the most reliable method of making water safe to drink?
A) Filtering alone
B) Multiple methods
C) Adding iodine.
D) Boiling alone
  • 25. Which of the following is NOT removed by boiling water?
A) Viruses
B) Protozoa
C) Lead
D) Bacteria
  • 26. What is the purpose of letting boiled water cool before drinking?
A) Add oxygen
B) Increase purity
C) Improve the taste
D) Prevent burns
  • 27. What does vigorously boiling water mean?
A) Just starting to steam
B) Gentle simmer
C) Rolling boil
D) Completely evaporated
  • 28. Which of the following will help remove particulate matter from water before boiling?
A) Adding sugar to the water
B) Exposing the water to sunlight
C) Filtering the water
D) Freezing the water
  • 29. Why should you consider the source of the water?
A) To assess likely contaminants
B) Because all sources are equally safe
C) Because all water tastes the same
D) Source doesn't matter
  • 30. What's a portable water boiling device?
A) Garden hose
B) Swimming pool
C) Camping stove
D) Shower head
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