Aha Trivia Stuff Everyone Should Know

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

Stuff Every Scuba Scout Should Know

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

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Free to start, no sign-up. 68 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 68 cards and timed practice exams.

How many practice questions are there?

68 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 does the acronym SCUBA stand for?
    Show the answer

    Self-contained underwater breathing apparatus. SCUBA is an acronym for self-contained underwater breathing apparatus, meaning the diver carries the breathing gas supply.

  2. What is the main advantage of scuba over surface-supplied diving?
    Show the answer

    It allows greater independence and movement. Carrying your own gas supply frees you from a hose to the surface, giving more independence and movement.

  3. What does an open-circuit scuba system do with exhaled gas?
    Show the answer

    Discharges it into the environment. Open-circuit scuba vents exhaled gas into the water as bubbles, unlike rebreathers that recycle it.

All 68 practice questions

The first 50 are free, with the answer, why it's right and the official sources. The other 18 (🔒) open with a membership (every test). Or play them as a game and track what you've learned.

Show all 68 questions
  1. What does the acronym SCUBA stand for?
  2. What is the main advantage of scuba over surface-supplied diving?
  3. What does an open-circuit scuba system do with exhaled gas?
  4. What is the job of a diving regulator?
  5. Why do divers wear fins?
  6. What does a diving mask provide that goggles do not?
  7. How much bigger do objects appear underwater through a mask?
  8. Why must you exhale through your nose as you descend?
  9. What is a simple way to stop a mask from fogging?
  10. What does a wetsuit's neoprene bubbles provide?
  11. When is a dry suit usually the better choice?
  12. Why might divers inflate a dry suit with argon?
  13. What is the purpose of a buoyancy compensator?
  14. Why is neutral buoyancy an unstable state?
  15. How can an open-circuit diver fine-tune buoyancy with lungs?
  16. Why should divers avoid skip breathing?
  17. What is the hazard of holding your breath while ascending?
  18. What causes decompression sickness, also called the bends?
  19. What is a safety stop?
  20. What does a dive computer monitor?
  21. Why should divers monitor remaining breathing gas?
  22. What is the buddy system meant to provide?
  23. What is an octopus regulator used for?
  24. Why do divers carry a cutting tool?
  25. What does a surface marker buoy show?
  26. Why do divers use hand signals underwater?
  27. What is the purpose of a guideline in cave or wreck diving?
  28. What is pilotage or natural navigation?
  29. What is nitrox?
  30. What risk rises with nitrox's higher oxygen content?
  31. What is trimix?
  32. Why do rebreathers appeal to scientific divers?
  33. What must a rebreather do with exhaled carbon dioxide?
  34. What is technical diving?
  35. What is a bailout cylinder for?
  36. Why might a diver use a diver propulsion vehicle?
  37. What does a submersible pressure gauge show?
  38. Why is a close-fitting wetsuit important?
  39. What happens to colors as a diver goes deeper?
  40. Why do divers log their dives?
  41. What is the purpose of a pre-dive equipment check?
  42. What is an ecosystem?
  43. What should you do if you suspect decompression illness after a dive?
  44. What is hypothermia?
  45. What is nitrogen narcosis?
  46. What is a squeeze in diving?
  47. What should you do before performing CPR?
  48. What is the Scuba Diver's Code about?
  49. What is one career path in the scuba industry?
  50. What should you earn before advanced scuba requirements?
  51. What certification is required for the scuba badge? 🔒
  52. Why study aquatic ecosystems as a diver? 🔒
  53. What should you research about a scuba career? 🔒
  54. Why discuss a scuba career with your counselor? 🔒
  55. Why do rebreathers allow longer dives? 🔒
  56. What is a common gas used in scuba cylinders? 🔒
  57. What is the purpose of ballast weights? 🔒
  58. Who trains scuba divers in skills and procedures? 🔒
  59. What do most training organizations require of divers? 🔒
  60. What does a snorkel help with? 🔒
  61. Why do divers use a dry suit in cold water? 🔒
  62. What happens to a wetsuit's volume as a diver descends? 🔒
  63. Why is fresh water different for buoyancy? 🔒
  64. What is diver trim? 🔒
  65. Why does poor trim increase effort? 🔒
  66. What color does water absorb first? 🔒
  67. What does a surface marker buoy do for ascent? 🔒
  68. What is decompression? 🔒