A) To kill harmful microorganisms B) To improve the taste C) To add minerals D) To remove sediment
A) 75°C (167°F) B) 150°C (302°F) C) 100°C (212°F) D) 50°C (122°F)
A) 15 seconds B) 1 minute C) 30 seconds D) 5 minutes
A) Stay the same B) Depends on humidity C) Increased D) Decreased
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
A) Stainless steel B) Aluminum C) Cardboard D) Plastic
A) Add sugar B) Filter out sediment C) Add salt D) Chill the water
A) Yes, all of them B) Yes, most of them C) Yes, only chlorine D) No
A) Add lemon B) Let it cool down C) Drink it immediately D) Add ice
A) Pesticides B) Bacteria and viruses C) Microplastics D) Heavy metals
A) Yes, always B) No, never C) Only bad odors D) Sometimes
A) In an open container B) In the refrigerator uncovered C) In a clean, sealed container D) In direct sunlight
A) 1 month B) Indefinitely C) 1 week D) 24 hours
A) Only wood B) Only electricity C) Only gas D) All of the above
A) Steaming gently B) Bubbling vigorously C) Still and clear D) Frothy on top
A) Yes, boiling makes it safe B) No, it's not safe C) Boiling is better after filtering D) Cloudiness is irrelevant
A) Boiling will remove all contaminants B) Boiling is not sufficient C) Just boil it longer D) Boil it twice
A) Removing harmful substances B) Adding flavors C) Making it colder D) Changing the color
A) Yes, completely B) No, never C) Makes it harder D) Partially
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
A) Uneven heating B) Faster boiling C) Higher temperature D) It's more energy-efficient
A) Boiling has no effect on hardness. B) Hardness prevents boiling. C) Boiling reduces some hardness. D) Boiling increases hardness.
A) Add chlorine. B) Boil the water. C) Locate the water source. D) Filter the water.
A) Filtering alone B) Multiple methods C) Adding iodine. D) Boiling alone
A) Viruses B) Protozoa C) Lead D) Bacteria
A) Add oxygen B) Increase purity C) Improve the taste D) Prevent burns
A) Just starting to steam B) Gentle simmer C) Rolling boil D) Completely evaporated
A) Adding sugar to the water B) Exposing the water to sunlight C) Filtering the water D) Freezing 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
A) Garden hose B) Swimming pool C) Camping stove D) Shower head |