Laurie's Excellent Scuba Certification Quiz #1

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Certification Quizzes & Trivia

These questions are from the information given to me by my scuba instructor. I wrote this test to help me study for the final scuba exam. The information is for a recreational intro course.


Questions and Answers
  • 1. 
    What does SCUBA stand for?
    • A. 

      Self Controlled Underwater Breathing Apparatus

    • B. 

      Self Compressed Underwater Breathing Apparatus

    • C. 

      Self Contained Underwater Breathing Apparatus

    • D. 

      Self Controlled Underwater Boyancy Apparatus

  • 2. 
    What is the No. 1 rule of Scuba Diving?
    • A. 

      Wait 30 min. after a meal before diving.

    • B. 

      Always dive with a buddy.

    • C. 

      Don't ascend too quickly.

    • D. 

      While scuba diving never hold your breath.

  • 3. 
    What is the second rule of Scuba Diving?
    • A. 

      Always dive with a buddy.

    • B. 

      Wait 30 min. after a meal before diving.

    • C. 

      While diving never hold your breath.

    • D. 

      When scuba diving don't ascend too quickly.

  • 4. 
    How fast should you ascend?
    • A. 

      1/2 the speed of your smallest air bubbles, 30 feet per min.

    • B. 

      1/2 the speed of your largest air bubbles, 30 feet per min.

    • C. 

      1/2 the speed of your smallest air bubbles, 30 feet per sec.

    • D. 

      1/2 the speed of your largest air bubbles, 30 feet per sec.

  • 5. 
    The air in your scuba tank is comprised of ___ oxygen and __ nitrogen.
    • A. 

      21%, 79%

    • B. 

      40%, 60%

    • C. 

      79%, 21%

    • D. 

      Pure, no

  • 6. 
    What is likely to be affected by the type and amount of suspended particles in the water?
    • A. 

      The visibility.

    • B. 

      The dive computer.

    • C. 

      Your buoyancy.

    • D. 

      The water temperature.

  • 7. 
    A thermocline ___.
    • A. 

      Is an abrupt change in water pressure.

    • B. 

      Is a gradual change of water temperature.

    • C. 

      Is an abrupt change of water temperature.

    • D. 

      Is an abrupt change of the underwater visibility.

  • 8. 
    What is the best course of action when you are out of air and your diving partner (buddy) is close-by?
    • A. 

      Signal to your diving partner that you will ascend, fill your tank and then come down again.

    • B. 

      Jerk your partners regulator so that he/she will share his/hers.

    • C. 

      Switch to your dive partner's alternate air source.

    • D. 

      Signal your partner to ascend to the surface.

  • 9. 
    How often is a "visual inspection" performed?
    • A. 

      Every 12 months

    • B. 

      Every 5 years

    • C. 

      Every 10 years

    • D. 

      Before every dive

  • 10. 
    How much faster than air does water conduct heat?
    • A. 

      25 times faster

    • B. 

      12 times faster

    • C. 

      5 times faster

    • D. 

      4 times faster

  • 11. 
    A mask squeeze is caused when the out-side pressure is lower than the pressure in the air space in the mask.
    • A. 

      True

    • B. 

      False

  • 12. 
    First aid treatment for a person suffering from decompression illness always includes 100% inhaled oxygen.
    • A. 

      True

    • B. 

      False

  • 13. 
    Which two materials are scuba tanks made from?
    • A. 

      Steel or lead

    • B. 

      Aluminum or steel

    • C. 

      Aluminum or hard plastic

    • D. 

      Steel or neoprene

  • 14. 
    How often is it recommended to have your scuba tank hydrostatically tested?
    • A. 

      Every year

    • B. 

      It is not necessary to test your tank unless you suspect that something is wrong with it.

    • C. 

      Every 5 years

    • D. 

      Every 10 years

  • 15. 
    Due to light refraction, objects underwater appear:
    • A. 

      Smaller and further away

    • B. 

      Smaller and closer

    • C. 

      Larger and closer

    • D. 

      Larger and further away

  • 16. 
    What does RNT stand for on a dive table?
    • A. 

      Reversed Nautical Table

    • B. 

      Reverse Natuical Tides

    • C. 

      Residual Nitrogen Time

    • D. 

      Responsible Navy Trainer

  • 17. 
    A diver is more buoyant in the sea than in a lake.
    • A. 

      True

    • B. 

      False

  • 18. 
    The large majority of surface waves are caused by:
    • A. 

      Wind

    • B. 

      Underwater earthquakes

    • C. 

      Boats and ships

    • D. 

      Underwater volcanoes

  • 19. 
    Sound travels __ times faster in water than in air due to density.
    • A. 

      3

    • B. 

      4

    • C. 

      5

    • D. 

      25

  • 20. 
    What percent of air is oxygen?
    • A. 

      21%

    • B. 

      79%

    • C. 

      47%

    • D. 

      56%

  • 21. 
    What is the main purpose of the "divers down" flag?
    • A. 

      To indicate a place or area offering diving related services.

    • B. 

      To notify people on a beach that there are dangerous currents in the water close to the shore.

    • C. 

      To notify any boats in the area that there are divers in the water.

    • D. 

      To notify divers that there might be sharks in the area.

  • 22. 
    Divers must stay within ___ feet of the diver down flag at all times.
    • A. 

      50

    • B. 

      100

    • C. 

      200

    • D. 

      300

  • 23. 
    Boaters distance from the divers down flag is dependent on State and local laws, but generally it is:  
    • A. 

      50 feet

    • B. 

      100 feet

    • C. 

      200 feet

    • D. 

      300 feet

  • 24. 
    What action is NOT likely to cause decompression sickness?
    • A. 

      Descending too quickly.

    • B. 

      Skipping the decompression stops after a long, deep dive.

    • C. 

      Flying on the same day as diving.

    • D. 

      Ascending too quickly.

  • 25. 
    What are the two basic parts of a regulator called?
    • A. 

      The first and second stage

    • B. 

      The hose and mouthpiece

    • C. 

      The first stage and the dust cap

    • D. 

      The valve and mouthpiece

  • 26. 
    What may be the cause if you are not able to equalize your body's air spaces while ascending or descending?
    • A. 

      A cold or an allergy.

    • B. 

      Exhaustion.

    • C. 

      A tight wetsuit.

    • D. 

      High blood pressure.

  • 27. 
    Most dive injuries caused by aquatic organisms result from a/an __ response from the organism.
    • A. 

      Defensive

    • B. 

      Offensive

    • C. 

      Unintentional

    • D. 

      Reflexive

  • 28. 
    What is mask squeeze?
    • A. 

      When the outside water pressure presses the mask against your face.

    • B. 

      When you are unable to equalize because of blocked nostrils.

    • C. 

      When the mask strap is too short.

    • D. 

      When the mask strap is untightened and the mask glides off.

  • 29. 
    At what depth will you reach 3 ATM (atmpsheres of pressure)?
    • A. 

      16.5 feet

    • B. 

      33 feet

    • C. 

      66 feet

    • D. 

      99 feet

  • 30. 
    What is "the bends?"
    • A. 

      It is a nickname for a strong underwater current.

    • B. 

      It is a common name for decompression sickness.

    • C. 

      It is a hand signal that means that you have half of your air left.

    • D. 

      It is a hose connecting the BCD to the tank.

  • 31. 
    What does the hand signal when you "slit your throat" mean?
    • A. 

      I am out of air.

    • B. 

      I must rest.

    • C. 

      I am going to kill you.

    • D. 

      I am low on air.

  • 32. 
    Which of the following can happen if you hold your breath while scuba diving?
    • A. 

      You can injure your lungs.

    • B. 

      You can sustain life threatening injuries.

    • C. 

      Air can get released into your blood stream.

    • D. 

      All of the above

  • 33. 
    If you feel discomfort or pain when descending you can ascend a few feet to make equalization easier.
    • A. 

      True

    • B. 

      False

  • 34. 
    What is the phenomenon called when your ears or sinuses hurt while you are descending?
    • A. 

      Equalization

    • B. 

      Anoxia

    • C. 

      Boyle's Law

    • D. 

      A squeeze

  • 35. 
    Nitrogen narcosis is most common at:
    • A. 

      33 feet

    • B. 

      Depths lower than 33 feet

    • C. 

      60 feet

    • D. 

      Depths approaching 99 feet and deeper

  • 36. 
    "An object is buoyed up by the weight of the water it displaces" is:
    • A. 

      Charle's Law

    • B. 

      Archimedes Princle of Buoyancy

    • C. 

      Boyle's Law

    • D. 

      Henry's Law

  • 37. 
    What is nitrogen narcosis caused by?
    • A. 

      A psychological defense mechanism.

    • B. 

      Increased levels of dissolved nitrogen in the blood.

    • C. 

      Breathing compressed air for too long.

    • D. 

      Lack of oxygen to the brain.

  • 38. 
    How often should you equalize your body air spaces during a descent to 50 feet?
    • A. 

      Once every 5 feet

    • B. 

      Every few feet, before you feel any discomfort

    • C. 

      Only when the pain is disturbing you

    • D. 

      When you feel discomfort

  • 39. 
    What is a recommended  care strategy for scuba tanks?
    • A. 

      Always store the tank in a warm space.

    • B. 

      Keep the tank valve moist at all times.

    • C. 

      Always leave some pressurized air in the tank.

    • D. 

      Never fill the tank with other gases than oxygen.

  • 40. 
    How does a neoprene wetsuit affect your buoyancy?
    • A. 

      The buoyancy effect varies from positive to negative depending on the wetsuit.

    • B. 

      A neoprene wetsuit does not affect your buoyancy.

    • C. 

      A neoprene wetsuit increases your buoyancy.

    • D. 

      A neoprene wetsuit decreases your buoyancy.

  • 41. 
    The dive knife is used primarliy:
    • A. 

      As a tool.

    • B. 

      To show off.

    • C. 

      As a substitute when you do not have a spear gun.

    • D. 

      As a weapon for underwater self-defense.

  • 42. 
    How should you clean your regulator after use if it is not attached to your scuba tank?
    • A. 

      With saltwater and soap, after removing the regulator dust cap completely.

    • B. 

      With a moist cloth.

    • C. 

      With warm fresh water, after removing the regulator dust cap, drying it and firmly reattaching it to the first stage.

    • D. 

      With cold fresh water, without ever removing the regulator dust cap.

  • 43. 
    An ear squeeze can be prevented by:
    • A. 

      Descending faster.

    • B. 

      Holding your breath.

    • C. 

      Breathing slowly.

    • D. 

      Valsalva- pinch your nose, tilt head back to stretch Eustachian Tube and breath slowly. Clear every 2 feet to equalize.

  • 44. 
    When a diver displaces water equal to their own weight he/she is neutrally buoyant.
    • A. 

      True

    • B. 

      False

  • 45. 
    How can you tell that you are properly weighted when you are in the water?
    • A. 

      You are floating at eye level while holding your breath and with your BCD empty.

    • B. 

      You are sinking slowly while holding your breath and with your BCD half-filled.

    • C. 

      You are floating at neck level with your BCD filled.

    • D. 

      You are neutrally buoyant while not wearing your weight belt.

  • 46. 
    Optimum dive time would be at:
    • A. 

      During high tide.

    • B. 

      30-40 min. before high slake tide occurs.

    • C. 

      After a low tide.

    • D. 

      During low tide.

  • 47. 
    What is the common term for the time a diver spends at the surface to allow excess nitrogen to off gas from their blood and tissues?
    • A. 

      Surface time

    • B. 

      Surface interval

    • C. 

      Dive interval

    • D. 

      Depressurization

  • 48. 
    The symptoms of nitrogen narcosis are said to be similar to:
    • A. 

      Alcohol intoxication

    • B. 

      A severe headache

    • C. 

      Fainting

    • D. 

      An out of body experience

  • 49. 
    Where are you exposed to 1 ATM (atmosphere) of pressure?
    • A. 

      33 feet

    • B. 

      66 feet

    • C. 

      99 feet

    • D. 

      At sea level

  • 50. 
    What will happen to your wetsuit as you descend?
    • A. 

      It will expand and feel looser against your body.

    • B. 

      It will get warmer and warmer.

    • C. 

      It will compress and decrease your buoyancy.

    • D. 

      It will expand and increase your buoyancy.

  • 51. 
    What is the most important feature of a weight system?
    • A. 

      That the weights are made of stainless steel.

    • B. 

      That it is easy to fasten and remove when you are on land.

    • C. 

      That it is easy to adjust.

    • D. 

      That it has a quick release mechanism.

  • 52. 
    What increases when the volume of a gas  decrease according to Boyle's Law?
    • A. 

      Explosiveness

    • B. 

      Temperature

    • C. 

      Density

    • D. 

      Pressure

  • 53. 
    Which three air spaces are most affected when descending into the water?
    • A. 

      Mouth, ears, and mask

    • B. 

      Lungs, mask, and stomach

    • C. 

      Sinuses, ears, and mask

    • D. 

      Sinuses, ears, and lungs

  • 54. 
    What can happen if you leave a full scuba tank in the truck of a car that is parked in the sun on a hot day?
    • A. 

      Nothing

    • B. 

      The o-ring can melt

    • C. 

      The tank can burst

    • D. 

      All the air can slowly leak out

  • 55. 
    Which of the following statements is correct?
    • A. 

      Neoprene is negatively buoyant.

    • B. 

      Dive tables are not recommended to bring if you have a dive computer.

    • C. 

      You should always dive with a dive partner.

    • D. 

      Air is mostly made up of oxygen.

  • 56. 
    What increases as the temperature of a gas increases according to Charle's Law?
    • A. 

      Volume

    • B. 

      Buoyancy

    • C. 

      Density

    • D. 

      Explosiveness

  • 57. 
    What happens with the underwater pressure every 33 feet while descending?
    • A. 

      It increases with one atmosphere (atm).

    • B. 

      It triples.

    • C. 

      It doubles.

    • D. 

      It increases 50%.

  • 58. 
    What is the most common symptom of decompression sickness?
    • A. 

      Joint pain

    • B. 

      Vomiting

    • C. 

      Coughing

    • D. 

      Fainting

  • 59. 
    Which of the following statements is TRUE?
    • A. 

      Most sounds seem to come from below when you are underwater.

    • B. 

      A diver is less buoyant in the sea than in a lake.

    • C. 

      Water pressure decreases with depth.

    • D. 

      According to Charle's Law gases expand when heated.

  • 60. 
    What does the SPG measure?
    • A. 

      The depth you are on.

    • B. 

      The pressure of the compressed air in your scuba tank.

    • C. 

      The time you have been submerged underwater.

    • D. 

      The amount of nitrogen your body has absorbed.

  • 61. 
    What does BCD stand for?
    • A. 

      Borderline Compression Diagram

    • B. 

      Buoyancy Compensation Device

    • C. 

      Breathing Capacity Device

    • D. 

      Breathing Control Device

  • 62. 
    What is the collective name for diving injuries caused by changes in air pressure?
    • A. 

      Underwater trauma

    • B. 

      Diver's disease

    • C. 

      Pressurization

    • D. 

      Barotrauma

  • 63. 
    What should you do if a series of dives are planned for one day?
    • A. 

      Make sure to breathe pure oxygen between your dives.

    • B. 

      Rest for several hours in between dives.

    • C. 

      Complete the deepest dive first.

    • D. 

      Complete the shallowest dive first.

  • 64. 
    What can a diver do to minimize the risk of decompression  sickness?
    • A. 

      Asend at a rate of 99 feet per minute.

    • B. 

      Avoid drinking water prior to diving.

    • C. 

      Avoid diving to dive table or dive computer limits.

    • D. 

      Breathe more slowly than normal.

  • 65. 
    What causes tides?
    • A. 

      Deep ocean currents.

    • B. 

      Waves.

    • C. 

      The gravitational attraction of the moon and the sun on the waters on earth.

    • D. 

      None of the above

  • 66. 
    At what depth will you reach 2 ATM of pressure?
    • A. 

      At sea level

    • B. 

      33 feet

    • C. 

      66 feet

    • D. 

      99 feet

  • 67. 
    What is a "drift dive"?
    • A. 

      When a diver is floating at the surface during a dive.

    • B. 

      When a diver performs multiple dives in one day.

    • C. 

      When a diver is dragged behind a boat by a rope.

    • D. 

      When a diver allows a current to carry him along.

  • 68. 
    What is the average full pressure of a recreational scuba tank?
    • A. 

      6000 psi

    • B. 

      7500 psi

    • C. 

      3000 psi

    • D. 

      1000 psi

  • 69. 
    A dive team caught in a rip current taking them in a direction they do not want to go, should:
    • A. 

      Descend immediately

    • B. 

      Swim at a right angle to the current

    • C. 

      Swim against the current

    • D. 

      Swim with the current

  • 70. 
    When you practice neutral bouyancy, inhalations will cause you to __ and exhaling will cause you to __.
    • A. 

      Ingas, outgas

    • B. 

      Roll, wiggle

    • C. 

      Rise, fall

    • D. 

      Implode, explode

  • 71. 
    A precautionary safety stop at a depth of 15 feet for 3 minutes:
    • A. 

      Is a no-no.

    • B. 

      Prevents air-embolisms.

    • C. 

      Mandatory for dives deeper than 20 feet.

    • D. 

      Helps eliminate nitrogen in your system through respiration

  • 72. 
    On ascent, remember to release expanding air in your BC to prevent:
    • A. 

      Rapid ascent

    • B. 

      Squeeze

    • C. 

      Nitrogen narcosis

    • D. 

      An explosion

  • 73. 
    Choose the correct equation for Boyle's Law:
    • A. 

      P1V1 = P2V2

    • B. 

      Y=MX + B

    • C. 

      E = MC2

    • D. 

      P/V / P/V

  • 74. 
    What is the limit for the recreational diver?
    • A. 

      60 feet

    • B. 

      130 feet

    • C. 

      3 ATM

    • D. 

      100 feet

  • 75. 
    Compared to sea level air pressure, air pressure in a scuba tank with 3000 psi is approximately how many times higher?
    • A. 

      50

    • B. 

      100

    • C. 

      200

    • D. 

      400

  • 76. 
    The total number of ATM of pressure on a scuba diver at 99 feet of sea water is:
    • A. 

      2

    • B. 

      3

    • C. 

      4

    • D. 

      5

  • 77. 
    Nitrogen Narcosis ("rapture of the deep") results from:
    • A. 

      Nitrogen forming bubbles in the nervous system

    • B. 

      Lack of oxygen to the brain from excess nitrogen pressure

    • C. 

      A direct effect of high nitrogen pressure on the nervous system

    • D. 

      Staying under water too long

  • 78. 
    Dive tables are based on the assumption that:
    • A. 

      The diver will make no more than three dives a day.

    • B. 

      All bottom time is spent at the deepest depth reached.

    • C. 

      The surface interval wil be at least one hour between dives.

    • D. 

      Any subsequent dive will be shallower than the one before.

  • 79. 
    Air embolism occurs on:
    • A. 

      Descent only.

    • B. 

      Ascent or descent, depending on where the diver holds his or her breath.

    • C. 

      Ascent or descent, depending on where the diver runs out of air.

    • D. 

      Ascent only, and depends on factors such as breath holding and state of the diver's lungs.

  • 80. 
    Which of the following factors is the same for air embolism and for decompression sickness?
    • A. 

      Composition of the gas bubbles

    • B. 

      Cause of the bubbles

    • C. 

      Time of onset of symptoms in relation to the end of the dive

    • D. 

      Method of treatment

  • 81. 
    If your regulator begins to "free flow" (release alot of air) while underwater you should:
    • A. 

      Ascend as you hold the regulator to your mouth without sealing your mouth around the mouth piece.

    • B. 

      Drop your weight sytem and ascend to the surface.

    • C. 

      Share air with your diving partner.

    • D. 

      Continue the dive until you run out of air and have to ascend.