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How to use a water filter (pump, gravity, straw) - Exam
Contributed by: Roe
  • 1. What is the primary purpose of using a water filter?
A) To heat water.
B) To color water.
C) To add flavor to water.
D) To remove harmful contaminants from water.
  • 2. What type of filter relies solely on gravity to purify water?
A) Chemical treatment
B) Straw filter
C) Pump filter
D) Gravity filter
  • 3. Which type of water filter requires manual effort to push water through the filter?
A) Boiling
B) Straw filter
C) Gravity filter
D) Pump filter
  • 4. Which filter type allows you to drink directly from a water source?
A) Sediment filter
B) Pump filter
C) Straw filter
D) Gravity filter
  • 5. What is the most common contaminant that water filters remove?
A) Minerals
B) Vitamins
C) Bacteria and protozoa
D) Sugar
  • 6. Why is pre-filtering water (e.g., through a cloth) recommended?
A) To change the color of water
B) To make the water taste better.
C) To remove large particles and extend filter life.
D) To add minerals to the water.
  • 7. What is 'backflushing' in the context of water filters?
A) Removing the filter from the water source.
B) Adding chemicals to the filter.
C) Storing the filter in a dry place
D) Cleaning the filter by reversing water flow.
  • 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) Use it to wash your hands.
B) Drink it; it's the purest water.
C) Store it for later.
D) Discard it, as it may contain manufacturing residue.
  • 10. What is the biggest disadvantage of a straw filter?
A) It's too heavy.
B) It adds a strange taste to the water.
C) It can only be used for direct drinking.
D) It requires batteries.
  • 11. What type of water source is LEAST suitable for any water filter?
A) Lake water.
B) River water.
C) Saltwater.
D) Stream water.
  • 12. What is a sign that your water filter needs to be replaced?
A) The filter becomes lighter.
B) The filter changes color.
C) The water tastes sweeter.
D) The flow rate significantly decreases.
  • 13. How should you store a water filter when not in use for an extended period?
A) Store it in the freezer.
B) Store it in direct sunlight.
C) Leave it wet in a sealed bag.
D) Clean and completely dry it.
  • 14. Which of these does a typical water filter NOT remove?
A) Bacteria
B) Protozoa
C) Sediment
D) Dissolved salts
  • 15. Which of the following is NOT a good water source for a filter?
A) Spring-fed lake.
B) Rainwater collected in a clean container.
C) Stagnant puddle near a road.
D) Fast-moving stream.
  • 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 weight of the filter.
C) The price of the filter.
D) The color of the filter.
  • 17. What maintenance step is crucial for pump filters with replaceable cartridges?
A) Polishing the filter body.
B) Replacing the cartridge after its lifespan.
C) Sharpening the filter edges.
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) Place the clean water reservoir higher.
C) Bury the dirty water reservoir.
D) Hang the dirty water reservoir higher than the clean water reservoir.
  • 19. What does micron rating on a water filter indicate?
A) The weight of the filter.
B) The price of the filter.
C) The flow rate of the filter.
D) The size of particles the filter can remove.
  • 20. What could happen if you use a filter beyond its recommended lifespan?
A) The flow rate will increase.
B) The water will taste better.
C) It may no longer effectively remove contaminants.
D) The filter will become self-cleaning.
  • 21. What is the danger of drinking unfiltered water?
A) Causes a metallic aftertaste.
B) Tastes unpleasant.
C) Risk of waterborne illnesses.
D) May cause dehydration.
  • 22. In what situations is using a water filter most important?
A) Buying bottled water at the store.
B) In a restaurant.
C) Backcountry hiking or camping.
D) At home with tap water.
  • 23. What does 'potable' mean in the context of water?
A) Safe to drink.
B) Salty.
C) Extremely polluted.
D) Frozen.
  • 24. Why is it important to understand the limitations of your water filter?
A) To make it more expensive.
B) To void the warranty.
C) To impress your friends.
D) To know what contaminants it can and cannot remove.
  • 25. What type of water is often safest, but requires filtration for ideal quality?
A) Swamp water
B) Ocean water
C) Sewage water
D) Well water
  • 26. If your water filter breaks down, what is the BEST backup plan for water purification?
A) Digging a deeper hole.
B) Boiling water.
C) Using sunscreen.
D) Building a fire for warmth.
  • 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) Wearing gloves.
C) Filling it during daylight hours.
D) Touching the inside of the container with dirty hands.
  • 28. Which of these features is MOST helpful in a pump-style water filter?
A) A bright color.
B) A built-in compass.
C) A pre-filter to remove larger particles.
D) A built-in whistle.
  • 29. What is an important safety precaution to take after using a water filter straw?
A) Submerge the straw in water.
B) Blow air back through the straw to clear any remaining water.
C) Bend the straw into a circle.
D) Store the straw in the sun.
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