Aha Trivia Stuff Everyone Should Know

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Stuff Every Whitewater Scout Should Know: free practice in 30-second cards

Stuff Every Whitewater Scout Should Know

Practice facts for the Whitewater merit badge. Not an official Scouting America credential.

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Free to start, no sign-up. 84 cards so far. One Knowledge Score and day streak across all your courses.

Questions people ask

Is this practice test free?

Yes. The first 50 cards are free for everyone with no sign-up, each with the answer, why it is right and its sources. Aha Trivia members get all 84 cards and timed practice exams.

How many practice questions are there?

84 practice questions so far. Each one is a 3-choice card that takes about 30 seconds, and the course grows as new cards pass our source checks.

Where do the answers come from?

Every card lists the sources it was checked against, and each answer explains why it is right. If you think an answer is wrong, tap "Challenge this answer" in the game and it gets reviewed.

Can I study in the car?

Yes. Voice mode reads the questions out loud and you answer by voice.

Try 3 cards

  1. What four factors can create rapids in a river?
    Show the answer

    Gradient, constriction, obstruction, and flow rate. Rapids form from gradient, constriction, obstruction, and flow rate, separately or combined.

  2. What does a river's gradient measure?
    Show the answer

    The rate it changes elevation along its course. Gradient is the elevation change along a river's course, which largely sets its speed.

  3. What happens when a river is forced into a narrower channel?
    Show the answer

    The water flows more rapidly. Constriction squeezes flow into a narrower channel, making water move faster and react to the riverbed.

All 84 practice questions

The first 50 are free, with the answer, why it's right and the official sources. The other 34 (🔒) open with a membership (every test). Or play them as a game and track what you've learned.

Show all 84 questions
  1. What four factors can create rapids in a river?
  2. What does a river's gradient measure?
  3. What happens when a river is forced into a narrower channel?
  4. What is a pillow in whitewater?
  5. Why are holes also called hydraulics dangerous?
  6. Why are low-head dams especially dangerous?
  7. What is a strainer in a river?
  8. What should you do if you cannot avoid a strainer?
  9. What is a sweeper?
  10. What is an eddy?
  11. What is an eddy line?
  12. Why are undercut rocks so dangerous?
  13. What is a sieve in whitewater?
  14. What does the International Scale of River Difficulty range from?
  15. What does a Class I rapid involve?
  16. What does a Class VI rapid mean?
  17. What does portaging mean?
  18. Why can a rapid's grade change?
  19. What usually happens to rapids at high water?
  20. Why is whitewater white?
  21. What does a pillow usually signal about a rock?
  22. What is an eddy wall?
  23. Why can eddies in very powerful water be dangerous?
  24. Why should you scout a river from shore?
  25. When is scouting especially important?
  26. What is the whitewater buddy system requirement?
  27. What is a throw rope used for in whitewater rescue?
  28. What should a swimmer do when receiving a throw rope?
  29. What should you do if capsized in moving water?
  30. Why wear a helmet and life jacket in whitewater?
  31. Why should you learn about sprains and strains for whitewater?
  32. Why is shoulder dislocation a whitewater concern?
  33. Why does a whitewater kayak differ from a sea kayak?
  34. What is a cataraft?
  35. Why do whitewater canoes often have airbags or foam?
  36. What is a C1 boat?
  37. What is a river bug?
  38. What is whitewater SUP?
  39. What is a McKenzie River dory known for?
  40. Why should you review personal and group equipment before a trip?
  41. What should a written trip plan include?
  42. What does edging a boat mean?
  43. When is edging useful?
  44. Why should you learn to read a Class II river section?
  45. Why should you learn about ledges?
  46. Why should you learn about hydraulics over ledges or low-head dams?
  47. Why should you learn first aid for head, neck, and back injuries?
  48. Why should you learn about submersion injuries?
  49. Why should you learn about cuts and bruises?
  50. Why should you learn about rocks as a hazard?
  51. Why are branches and trees in the water a hazard? 🔒
  52. Why should you learn about sieves and strainers together? 🔒
  53. Why should you learn about the flow rate of a river? 🔒
  54. Why should you learn about gradient, constriction, and obstruction as streambed factors? 🔒
  55. Why can floods change the streambed? 🔒
  56. Why should you learn about eddies as rest spots? 🔒
  57. Why should you learn about the danger of low-head dams even for experts? 🔒
  58. Why should you learn about the International Scale for a stretch of river? 🔒
  59. Why should you identify river characteristics that affect classification? 🔒
  60. Why should you learn about canoes used on moving water? 🔒
  61. Why should you learn about kayaks used on moving water? 🔒
  62. Why should you learn about the Eskimo roll for kayaks? 🔒
  63. Why do whitewater canoes need more skill to roll than kayaks? 🔒
  64. Why should you learn about rafts as whitewater craft? 🔒
  65. Why should you learn about catarafts being paddled or rowed? 🔒
  66. Why should you learn about creature craft roll cages? 🔒
  67. Why should you learn about whitewater SUP safety gear? 🔒
  68. Why should you learn about the danger of strainers on outside curves? 🔒
  69. Why should you learn about swimming aggressively away from a strainer? 🔒
  70. Why should you learn about holes being play spots too? 🔒
  71. Why should you learn about aerated water in holes? 🔒
  72. Why should you learn about the danger of undercut rocks in limestone rivers? 🔒
  73. Why should you learn about the danger of Dimple Rock? 🔒
  74. Why should you learn about the danger of swimming in fast water? 🔒
  75. Why should you learn about personal flotation devices? 🔒
  76. Why should you learn about the danger of flood stage rapids? 🔒
  77. Why should you learn about the danger of terminal hydraulics? 🔒
  78. Why should you learn about the danger of sieves forcing water through? 🔒
  79. Why should you learn about the danger of pillows hiding undercuts? 🔒
  80. Why should you learn about the danger of floating debris in low-head dams? 🔒
  81. Why should you learn about the danger of undercut rocks in steep canyons? 🔒
  82. Why should you learn about the danger of flooded bushes by the river? 🔒
  83. Why should you learn about the danger of rebar in the water? 🔒
  84. Why should you learn about the danger of storm grates over tunnels? 🔒