Scuba Diving Quiz

Score one point for each question you answer correctly.

(answers below)
  1. what does scuba stand for?
  2. at what depth will you reach 1ATM of pressure?
  3. at what depth will you reach 2ATM of pressure?
  4. What is a pressure squeeze?
  5. What are the bends?
  6. What are the 3 reasons you might need a scuba dive knife?
  7. What are the two basic parts of a regulator called?
  1. What 2 metals are scuba tanks made from?
  2. Answer true or false:
    1. air is mostly oxygen
    2. a properly fitted dive mask is tight
    3. a properly fitted wet suit is tight
    4. a pony tank is only for emergencies
    5. it's OK to harvest coral as long as it's not alive
  3. What is RNT, on a dive table?
  4. What is nitrogen narcosis?
  5. According to Charles' law, what increases as the temperature of a gas increases?
  6. According to Boyle's law, what is increased as you decrease the volume of a gas?
  7. According to Henry's law, what causes a solute to absorb more gases into solution?
  8. What does a "thumbs up" sign mean?
  9. What does the "thumping on the chest" signal mean?
  10. What does the "slitting throat" signal mean?
  11. Which 3 air spaces are most affected when descending?
  12. Who invented the aqua-lung?
  13. In what kind of scuba diving does a scuba diver allow a current to carry her along?
  14. What are the two most prominent scuba diving certification associations in the world?


  1. SCUBA is an acronym for Self-Contained Underwater Breathing Apparatus. The word scuba is so common and ubiquitous that, like similar acronyms such as radar and laser, the word scuba is used without capitals as a regular noun or adjective.
  2. A scuba diver (or anyone, for that matter) is affected by 1 ATM of pressure on the surface, at sea level. 1ATM is normal atmospheric pressure.
  3. scuba divers will experience 2ATM of pressure at a depth of 33 ft.
  4. A pressure squeeze is pain caused by gases in the body at unequal pressures. A pressure squeeze will be felt within the first 15 feet of descent, if the scuba diver does not "equalize" air spaces such as the lungs, mask, sinuses and ear canals (Eustachian tubes).
  5. "The bends" is a common name for decompression sickness (DCS). DCS is a symptom of rapid decompression, which causes gases to come out of solution in body tissues. This often happens in and near joints, is extremely painful, and thus the scuba diver "bends" over in pain. Hence the name.
  6. Three reasons you might need a dive knife are: 1) to release yourself from tangles of fishing line or sea weed, 2) to make emergency adjustments to equipment, or 3) to fight underwater spies. 2 out of 3 on this question is acceptable.
  7. The two basic parts of a regulator are called the first and second stage.
  8. Scuba tanks are made from aluminum or steel.
    1. false. The most common gas in air is nitrogen.
    2. false. a dive mask should fit your face comfortably and form a seal without being tight.
    3. true. a wet suit will be tight on the surface, and when you descend the neoprene compresses and feels looser. A rule of thumb is that the wet suit should be difficult to get zipped up, but once inside it should not limit your movement or breathing (if it does then it's too tight).
    4. false. Many people use a pony tank for supplemental air so they can dive longer.
    5. false. This misconception is all too common. It is NEVER acceptable to touch, harvest or otherwise molest a coral formation.
  9. RNT is residual nitrogen time; a calculation of the amount of time it would take you at a certain depth to accumulate the amount of nitrogen already dissolved in your body. RNT is subtracted from the maximum dive time allowed at that depth.
  10. Nitrogen narcosis is intoxication by nitrogen. It occurs at low depths where the amount of nitrogen in your body can reach toxic levels. The symptoms are similar to alcohol intoxication.
  11. Volume
  12. Pressure
  13. Increased pressure
  14. A "thumbs up" sign means it's time to ascend; the dive is over.
  15. The "thumping on the chest" signal means "running out of air"
  16. The "slitting throat" signal means "out of air"
  17. The 3 air spaces most affected when descending are the sinuses, ears, and mask.
  18. The Aqua-Lung was invented by Jacques-Yves Cousteau and Emile Gagnan
  19. Drift diving
  20. PADI (Professional Association of Diving Instructors) and NAUI (National Association of Underwater Instructors) are the two most prominent certification associations recognized worldwide.
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