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How to use a water filter (pump, gravity, straw) - Exam
  • 1. What is the primary purpose of using a water filter?
A) To remove harmful contaminants from water.
B) To add flavor to water.
C) To color water.
D) To heat water.
  • 2. What type of filter relies solely on gravity to purify water?
A) Straw filter
B) Chemical treatment
C) Pump filter
D) Gravity filter
  • 3. Which type of water filter requires manual effort to push water through the filter?
A) Pump filter
B) Gravity filter
C) Straw filter
D) Boiling
  • 4. Which filter type allows you to drink directly from a water source?
A) Straw filter
B) Gravity filter
C) Pump filter
D) Sediment filter
  • 5. What is the most common contaminant that water filters remove?
A) Minerals
B) Bacteria and protozoa
C) Vitamins
D) Sugar
  • 6. Why is pre-filtering water (e.g., through a cloth) recommended?
A) To remove large particles and extend filter life.
B) To add minerals to the water.
C) To change the color of water
D) To make the water taste better.
  • 7. What is 'backflushing' in the context of water filters?
A) Removing the filter from the water source.
B) Storing the filter in a dry place
C) Cleaning the filter by reversing water flow.
D) Adding chemicals to the filter.
  • 8. How often should you clean a water filter?
A) Only when the water tastes bad.
B) Never.
C) According to the manufacturer's instructions.
D) Once a year.
  • 9. What should you do with the first few pumps/pours of filtered water?
A) Discard it, as it may contain manufacturing residue.
B) Store it for later.
C) Drink it; it's the purest water.
D) Use it to wash your hands.
  • 10. What is the biggest disadvantage of a straw filter?
A) It adds a strange taste to the water.
B) It's too heavy.
C) It requires batteries.
D) It can only be used for direct drinking.
  • 11. What type of water source is LEAST suitable for any water filter?
A) Stream water.
B) Saltwater.
C) River water.
D) Lake water.
  • 12. What is a sign that your water filter needs to be replaced?
A) The filter changes color.
B) The flow rate significantly decreases.
C) The water tastes sweeter.
D) The filter becomes lighter.
  • 13. How should you store a water filter when not in use for an extended period?
A) Clean and completely dry it.
B) Store it in the freezer.
C) Store it in direct sunlight.
D) Leave it wet in a sealed bag.
  • 14. Which of these does a typical water filter NOT remove?
A) Dissolved salts
B) Bacteria
C) Protozoa
D) Sediment
  • 15. Which of the following is NOT a good water source for a filter?
A) Fast-moving stream.
B) Rainwater collected in a clean container.
C) Spring-fed lake.
D) Stagnant puddle near a road.
  • 16. What is the most important factor to consider when choosing a water filter?
A) The type of contaminants you need to remove.
B) The color of the filter.
C) The price of the filter.
D) The weight of the filter.
  • 17. What maintenance step is crucial for pump filters with replaceable cartridges?
A) Replacing the cartridge after its lifespan.
B) Sharpening the filter edges.
C) Polishing the filter body.
D) Oiling the handle.
  • 18. What's the best practice when using a gravity filter at a campsite?
A) Place both reservoirs at the same height.
B) Bury the dirty water reservoir.
C) Hang the dirty water reservoir higher than the clean water reservoir.
D) Place the clean water reservoir higher.
  • 19. What does micron rating on a water filter indicate?
A) The size of particles the filter can remove.
B) The price of the filter.
C) The weight of the filter.
D) The flow rate of the filter.
  • 20. What could happen if you use a filter beyond its recommended lifespan?
A) The flow rate will increase.
B) The filter will become self-cleaning.
C) It may no longer effectively remove contaminants.
D) The water will taste better.
  • 21. What is the danger of drinking unfiltered water?
A) Tastes unpleasant.
B) May cause dehydration.
C) Risk of waterborne illnesses.
D) Causes a metallic aftertaste.
  • 22. In what situations is using a water filter most important?
A) At home with tap water.
B) Buying bottled water at the store.
C) In a restaurant.
D) Backcountry hiking or camping.
  • 23. What does 'potable' mean in the context of water?
A) Extremely polluted.
B) Safe to drink.
C) Frozen.
D) Salty.
  • 24. Why is it important to understand the limitations of your water filter?
A) To make it more expensive.
B) To impress your friends.
C) To know what contaminants it can and cannot remove.
D) To void the warranty.
  • 25. What type of water is often safest, but requires filtration for ideal quality?
A) Well water
B) Swamp water
C) Sewage water
D) Ocean water
  • 26. If your water filter breaks down, what is the BEST backup plan for water purification?
A) Boiling water.
B) Building a fire for warmth.
C) Using sunscreen.
D) Digging a deeper hole.
  • 27. What should you avoid doing when filling your dirty water reservoir for a gravity filter?
A) Using a container that is too large.
B) Touching the inside of the container with dirty hands.
C) Wearing gloves.
D) Filling it during daylight hours.
  • 28. Which of these features is MOST helpful in a pump-style water filter?
A) A pre-filter to remove larger particles.
B) A built-in compass.
C) A bright color.
D) A built-in whistle.
  • 29. What is an important safety precaution to take after using a water filter straw?
A) Blow air back through the straw to clear any remaining water.
B) Bend the straw into a circle.
C) Submerge the straw in water.
D) Store the straw in the sun.
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