Naui Basic Diver Practice Quiz

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Questions: 130 | Attempts: 6,942 | Updated: Aug 12, 2024

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Do you love scuba diving? If yes, then you are going to love this NAUI basic diver practice quiz as well. This practice quiz will help you prepare for the final exam in the NAUI Basic Diver course. NAUI stands for the National Association of Underwater Instructors, a non-profit association of scuba instructors. This association primarily works as a recreational dive certification and membership organization established to provide international diver standards and education programs. All the best to you!

Questions and Answers

1.

The top five gasses found in normal (atmospheric) air by volume are:
- A.
  
  Nitrogen, Oxygen, Carbon Monoxide, Hydrogen, Helium
- B.
  
  Carbon Monoxide, Nitrogen, Oxygen, Xenon, Water Vapor
- C.
  
  Nitrogen, Oxygen, Argon, Carbon Dioxide, Neon
- D.
  
  Oxygen, Nitrogen, Carbon Dioxide, Helium, Radon
Correct Answer
C. Nitrogen, Oxygen, Argon, Carbon Dioxide, Neon

Explanation
The correct answer is Nitrogen, Oxygen, Argon, Carbon Dioxide, Neon. These five gases are found in normal atmospheric air in varying volumes. Nitrogen is the most abundant gas, making up about 78% of the air. Oxygen is the second most abundant gas, comprising about 21%. Argon is present in trace amounts, around 0.93%. Carbon Dioxide is a greenhouse gas and is present in very small amounts, around 0.04%. Neon is an inert gas and is found in even smaller quantities.

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2.

The absolute pressure exerted by the Earth's atmosphere on a person standing on the shore at sea level is:
- A.
  
  1 BAR
- B.
  
  1 atmosphere of pressure
- C.
  
  14.7 PSI
- D.
  
  All of the above
Correct Answer
D. All of the above

Explanation
The correct answer is "All of the above." This means that all the options listed - 1 atmosphere of pressure, 14.7 PSI, and 1 BAR - are correct and can be used to describe the absolute pressure exerted by the Earth's atmosphere on a person standing on the shore at sea level.

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3.

The absolute pressure exerted on a diver at 10 meters (33 feet) in sea water is:
- A.
  
  64.4 psi
- B.
  
  10 BAR
- C.
  
  3 atmospheres of pressure
- D.
  
  None of the above
Correct Answer
D. None of the above
4.

The primary factors determining your air consumption rate are:
- A.
  
  Depth, Total Nitrogen Time, and fin size
- B.
  
  Age, currents, and visibility
- C.
  
  Water temperature, Residual Nitrogen Time, physical fitness of diver
- D.
  
  Depth, physical activity, and water temperature
Correct Answer
D. Depth, pHysical activity, and water temperature

Explanation
The primary factors that determine your air consumption rate while diving are depth, physical activity, and water temperature. Depth affects the pressure on your body, which in turn affects your breathing rate. Physical activity increases your breathing rate and therefore your air consumption. Water temperature also affects your breathing rate, as colder water can cause your body to work harder to maintain its temperature. These three factors combined have a significant impact on how quickly you consume air while diving.

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5.

When selecting a wet suit, key factors to consider include:
- A.
  
  Protection from marine life, donning difficulty, seals around wrists and ankles
- B.
  
  Color, knee padding, and zipper style
- C.
  
  Fit, comfort, and appropriate thickness for your intended dive conditions
- D.
  
  None of the above
Correct Answer
C. Fit, comfort, and appropriate thickness for your intended dive conditions

Explanation
The key factors to consider when selecting a wet suit include fit, comfort, and appropriate thickness for the intended dive conditions. Fit is important to ensure that the wet suit provides proper insulation and does not restrict movement. Comfort is crucial for a pleasant diving experience. The appropriate thickness of the wet suit will depend on the water temperature and the duration of the dive. These factors are essential in choosing a wet suit that will provide the necessary protection and insulation during the dive.

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6.

A dry suit is used for:
- A.
  
  Cold water conditions
- B.
  
  Diving in areas with possible pollutants
- C.
  
  Technical diving
- D.
  
  Any/all of the above
Correct Answer
D. Any/all of the above

Explanation
A dry suit is a type of diving suit that provides insulation and keeps the diver dry. It is used in various situations, including diving in areas with possible pollutants, technical diving, and cold water conditions. The suit's design prevents water from entering, allowing the diver to stay warm and protected from the elements. Therefore, the correct answer is "Any/all of the above" as all the mentioned situations require the use of a dry suit.

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7.

When diving a new dive site it is best to:
- A.
  
  Just start diving and learning. Experience is the best teacher
- B.
  
  Dive with a buddy who has experience at that site
- C.
  
  Read a book about the dive site
- D.
  
  Take many pictures with your underwater camera to document the site for future dives
Correct Answer
B. Dive with a buddy who has experience at that site

Explanation
When diving a new dive site, it is best to dive with a buddy who has experience at that site. This is because an experienced buddy can provide valuable information about the site, such as potential hazards, currents, and the best routes to take. They can also share their knowledge and help navigate the site, ensuring a safer and more enjoyable dive. Diving with an experienced buddy increases the chances of having a successful dive and reduces the risk of encountering any unforeseen difficulties.

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8.

Special hazards that exist in and around wrecks include:
- A.
  
  Entanglement in wreck debris
- B.
  
  Entrapment in confined spaces
- C.
  
  Low light/visibility
- D.
  
  Encounters with marine life
- E.
  
  All of the above
Correct Answer
E. All of the above

Explanation
The special hazards that exist in and around wrecks include entrapment in confined spaces, low light/visibility, encounters with marine life, and entanglement in wreck debris. These hazards can pose significant risks to individuals exploring or working in wrecked areas. Entrapment in confined spaces can lead to difficulty in escaping or getting help. Low light/visibility can make it challenging to navigate and identify potential dangers. Encounters with marine life can result in injuries or attacks. Entanglement in wreck debris can cause injuries or restrict movement. Therefore, all of the above hazards should be considered and managed when dealing with wrecks.

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9.

NAUI recommends that divers observe a _____________ Surface Interval Time (SIT) between repetitive dives.
- A.
  
  30 minute
- B.
  
  1 hour
- C.
  
  2 hour
- D.
  
  4 hour
Correct Answer
B. 1 hour

Explanation
NAUI recommends that divers observe a 1-hour Surface Interval Time (SIT) between repetitive dives. This is important to allow the body to eliminate excess nitrogen absorbed during the previous dive and reduce the risk of decompression sickness. Taking a longer surface interval allows for better off-gassing of nitrogen, ensuring the safety of the diver. A shorter surface interval may not provide enough time for the body to adequately eliminate nitrogen, increasing the risk of decompression sickness.

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10.

"Rapture of the Deep" is an intoxicated, euphoric feeling sometimes experienced by divers, which is more formally known as:
- A.
  
  Decompression Sickness (DCS)
- B.
  
  Pneumothorax
- C.
  
  Pulminary Embollism
- D.
  
  Nitrogen Narcosis
Correct Answer
D. Nitrogen Narcosis

Explanation
Nitrogen Narcosis is the correct answer because it refers to the intoxicated, euphoric feeling experienced by divers at great depths. This condition occurs due to the increased pressure of nitrogen in the bloodstream, leading to symptoms similar to alcohol intoxication. It is important for divers to be aware of this condition as it can impair judgment and coordination, potentially leading to dangerous situations underwater.

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11.

When consuming alcoholic beverages, divers should:
- A.
  
  Limit consuming alcohol to a few hours before diving
- B.
  
  Abstain from alcohol for at least 12 hours before diving
- C.
  
  Drink extra water because alcohol can lead to dehydration
- D.
  
  Consume no more than 2 drinks or maintain .05 Blood Alcohol Content (BAC) or lower in bloodstream
Correct Answer
B. Abstain from alcohol for at least 12 hours before diving
12.

Objects under water may appear __________________ and ____________________ than on land.
- A.
  
  Closer, faster
- B.
  
  Brighter, shinier
- C.
  
  Larger, closer
- D.
  
  Smaller, slower
Correct Answer
C. Larger, closer

Explanation
Objects under water may appear larger because of the way light behaves in water. When light enters water, it slows down and bends, causing objects to appear closer than they actually are. This phenomenon, known as refraction, can make objects seem larger and closer when viewed underwater compared to when they are viewed on land.

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13.

Decompression sickness, or "the bends" occurs when:
- A.
  
  Divers descend too quickly and cause rupture of the eardrums
- B.
  
  Divers ascend from depth too quickly, causing dissolved nitrogen to come out of solution in the body
- C.
  
  Divers ascend too quickly, become disoriented and crash into the dive boat
- D.
  
  Divers get a muscle cramp and ask their buddy to help "bend" their legs to relieve the cramps
Correct Answer
B. Divers ascend from depth too quickly, causing dissolved nitrogen to come out of solution in the body

Explanation
Decompression sickness, also known as "the bends," occurs when divers ascend from depth too quickly. When divers are deep underwater, the increased pressure causes nitrogen to dissolve into their tissues and bloodstream. If they ascend too quickly, the decreased pressure causes the nitrogen to come out of solution, forming bubbles in the body. These bubbles can block blood vessels, leading to various symptoms such as joint pain, dizziness, and even organ damage. Therefore, the correct answer is that divers ascend from depth too quickly, causing dissolved nitrogen to come out of solution in the body.

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14.

The "Lost Buddy Procedure" includes the following steps:
- A.
  
  Ascend, look for your buddy's bubbles, if they are not present, continue to the agreed upon rendezvous point
- B.
  
  Immediately ascend and look for your buddy at the surface
- C.
  
  Ascend a few feet, look for your buddy's bubbles, ascend a few feet more, look for bubbles, and repeat until surfaced, wait at the surface for your buddy.
- D.
  
  None of these
Correct Answer
C. Ascend a few feet, look for your buddy's bubbles, ascend a few feet more, look for bubbles, and repeat until surfaced, wait at the surface for your buddy.

Explanation
The correct answer is the "Lost Buddy Procedure" includes ascending a few feet, looking for your buddy's bubbles, ascending a few feet more, looking for bubbles, and repeating this process until surfaced, and then waiting at the surface for your buddy. This procedure is a safety measure in scuba diving to locate a lost buddy underwater. By ascending gradually and looking for bubbles, divers can increase the chances of finding their buddy and reuniting at the surface. Waiting at the surface ensures that both divers are safe and accounted for.

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15.

The benefit of the Push method of tired diver recovery, where the rescuer pushes the tired diver while holding the tired diver's fins to their shoulders include:
- A.
  
  The ability to look into the tired diver's face to assess consciousness or shock
- B.
  
  The ability to swim in a more streamlined manner to cover more distance
- C.
  
  The ability to steer and control your buddy in the water
- D.
  
  All of the above
Correct Answer
D. All of the above

Explanation
The Push method of tired diver recovery, where the rescuer pushes the tired diver while holding the tired diver's fins to their shoulders, offers several benefits. Firstly, it allows the rescuer to look into the tired diver's face, enabling them to assess the diver's level of consciousness or shock. Additionally, by holding the diver's fins to their shoulders, the rescuer can swim in a more streamlined manner, covering more distance efficiently. Lastly, this method provides the rescuer with the ability to steer and control their buddy in the water, ensuring their safety during the recovery process.

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16.

Ripples in a sandy bottom, rock formation, sun direction, and wave action are all forms of natural navigation.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The statement is true because ripples in a sandy bottom, rock formation, sun direction, and wave action are all natural elements that can be used for navigation. Ripples in a sandy bottom can indicate the direction of water flow, rock formations can serve as landmarks, the direction of the sun can help determine east and west, and wave action can provide information about the strength and direction of currents. Therefore, these natural features can be used by navigators to determine their position and direction in the absence of modern navigation tools.

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17.

Naturally occurring magnetic minerals (such as magnetite) in rocks/ledge on the bottom can throw off your compass, making compass navigation more difficult.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The presence of naturally occurring magnetic minerals, like magnetite, in rocks or ledges on the bottom can cause interference with a compass. This interference can disrupt the accuracy of the compass needle, making it more challenging to navigate using a compass. Therefore, the statement is true.

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18.

Divers should breathe ______________________ and ___________________ than they would on land.
- A.
  
  Slower, shallower
- B.
  
  Quicker, shallower
- C.
  
  Slower, deeper
- D.
  
  Quicker, deeper
Correct Answer
C. Slower, deeper

Explanation
When diving, divers should breathe slower and deeper than they would on land. This is because the pressure underwater can affect the way our bodies absorb oxygen. Breathing slower allows for more efficient gas exchange in the lungs, while breathing deeper ensures that enough oxygen is taken in to meet the body's needs. Additionally, breathing slower and deeper helps to conserve air and extend the dive time.

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19.

The "Giant Stride" entry is characterized by:
- A.
  
  A backward roll into the ocean from the side of the boat
- B.
  
  A vertical step into the ocean and away from a solid platform, such as a boat deck or flat rock
- C.
  
  A feet-first hop from the stern of the dive boat
- D.
  
  The waterslide off the stern of the dive boat
Correct Answer
B. A vertical step into the ocean and away from a solid platform, such as a boat deck or flat rock

Explanation
The "Giant Stride" entry is characterized by a vertical step into the ocean and away from a solid platform, such as a boat deck or flat rock. This means that the diver takes a step off a solid surface and enters the water in a vertical position. This entry method is commonly used when diving from a boat or a rocky shoreline, allowing the diver to enter the water smoothly and safely. It is important to enter the water in a controlled manner to avoid injuries and to maintain proper buoyancy for the dive.

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20.

If you are feeling short of breath on a dive, you must ________________________, ______________________ and ______________________.
- A.
  
  Stop using your arms, breathe rapidly to increase oxygen, and ascend
- B.
  
  Stop swimming, check your regulator, and ask your buddy to turn your SCUBA cylinder on more
- C.
  
  Stop, ditch weight, and tell your buddy to slow down
- D.
  
  Stop swimming, rest, and breathe deeply
Correct Answer
D. Stop swimming, rest, and breathe deeply

Explanation
When feeling short of breath on a dive, it is important to stop swimming to conserve energy and rest. By resting, the body can recover and regain control of breathing. Breathing deeply helps to increase oxygen intake and alleviate the feeling of breathlessness.

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21.

A diver should never allow SCUBA cylinders to:
- A.
  
  Be stacked for fear of breakage
- B.
  
  Overheat in cars or while in storage
- C.
  
  Be painted or covered in adhesive decals
- D.
  
  Be taken apart for internal visual inspection
Correct Answer
B. Overheat in cars or while in storage

Explanation
SCUBA cylinders should never be allowed to overheat in cars or while in storage. Overheating can cause the pressure inside the cylinder to increase, which can lead to a rupture or explosion. It is important to store SCUBA cylinders in a cool and well-ventilated area to prevent overheating. Additionally, leaving them in a car on a hot day can also cause overheating and should be avoided. Proper storage and handling of SCUBA cylinders is crucial for diver safety.

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22.

Contingency SCUBA can be characterized by:
- A.
  
  Letting your buddy breathe off your octo/backup 2nd stage regulator if he/she runs out of air
- B.
  
  Planning your dive with your buddy and discussing what to do in the case of emergency
- C.
  
  Telling your friends and family where you will be diving in case of an accident
- D.
  
  Bringing a completely independent SCUBA cylinder and regulator on your dive
Correct Answer
D. Bringing a completely independent SCUBA cylinder and regulator on your dive

Explanation
Contingency SCUBA can be characterized by bringing a completely independent SCUBA cylinder and regulator on your dive. This means having a separate set of equipment that is not connected to your buddy's equipment. This is important because it provides an additional source of air in case of an emergency, such as your buddy running out of air or equipment failure. By having a completely independent system, you can ensure that you have a backup option to safely complete your dive.

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23.

Salt water is:
- A.
  
  Denser and heavier than fresh water, making you more bouyant
- B.
  
  Denser and heavier than fresh water, making you less bouyant
- C.
  
  Less dense/lighter than fresh water, making you less bouyant
- D.
  
  Less dense/lighter than fresh water, making you more bouyant
Correct Answer
A. Denser and heavier than fresh water, making you more bouyant

Explanation
Salt water is denser and heavier than fresh water because it contains a higher concentration of dissolved salts and minerals. This increased density makes objects more buoyant in salt water compared to fresh water. When an object is placed in salt water, it experiences an upward force due to the difference in density, which makes it easier to float or stay afloat. Therefore, salt water makes you more buoyant.

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24.

Archimedes' Principle states that:
- A.
  
  Gasses such as air are compressed by one atmosphere of pressure or 14.7 PSI for every 33 feet of depth
- B.
  
  Water density is constant at all depths because water cannot be compressed
- C.
  
  An object's upward buoyant force is equal to the weight (downward force due to gravity) of the fluid displaced by the object
- D.
  
  None of these
Correct Answer
C. An object's upward buoyant force is equal to the weight (downward force due to gravity) of the fluid displaced by the object

Explanation
The given answer is correct because Archimedes' Principle states that the upward buoyant force experienced by an object immersed in a fluid is equal to the weight of the fluid that is displaced by the object. This means that the buoyant force is directly proportional to the weight of the fluid displaced, which in turn is equal to the weight of the object itself. This principle helps explain why objects float or sink in fluids based on their density relative to the density of the fluid.

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25.

There are several distinct styles of buoyancy compensating devices (BCDs), including:
- A.
  
  Jacket/vest
- B.
  
  Horse collar
- C.
  
  Back/rear flotation
- D.
  
  Diving bell
- E.
  
  A and C above
- F.
  
  A, B & C above
- G.
  
  A, B, C & D above
Correct Answer
F. A, B & C above

Explanation
The correct answer is A, B & C above. This means that there are several distinct styles of buoyancy compensating devices (BCDs) which include the jacket/vest, horse collar, and back/rear flotation. The answer excludes the option of diving bell, as it is not considered a style of BCD.

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26.

As a diver descends, his or her neoprene wet suit will become compressed, slightly reducing its insulating value and making it less buoyant.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
As a diver descends deeper into the water, the pressure increases, causing the neoprene wet suit to compress. This compression reduces the amount of air trapped within the suit's fabric, which in turn decreases its insulating value. With less insulation, the wet suit is less effective in keeping the diver warm. Additionally, the compression of the wet suit also reduces its buoyancy, making the diver slightly less buoyant in the water. Therefore, the statement is true.

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27.

Hand signals:
- A.
  
  Must be repeatable and only used in emergencies
- B.
  
  Are only good for checking your buddy's remaining air
- C.
  
  Cannot be performed when wearing gloves
- D.
  
  Must be clear, distinct, and agreed upon prior the dive
Correct Answer
D. Must be clear, distinct, and agreed upon prior the dive

Explanation
The hand signals used during a dive must be clear, distinct, and agreed upon prior to the dive. This ensures that all divers understand and can interpret the signals correctly. Clear and distinct signals are important for effective communication underwater, where verbal communication is not possible. By agreeing upon the signals beforehand, divers can ensure that they are using a standardized set of signals that everyone is familiar with. This helps to prevent confusion and miscommunication during the dive, enhancing safety and coordination among the diving team.

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28.

A principal threat to divers from air cylinders filled at non-certified locations is:
- A.
  
  Overfilling which may cause damage to burst discs
- B.
  
  Failure to perform the required annual inspections
- C.
  
  Air impurity that may include harmful gasses, such as carbon monoxide
- D.
  
  None of the above
Correct Answer
C. Air impurity that may include harmful gasses, such as carbon monoxide

Explanation
Air impurity that may include harmful gases, such as carbon monoxide, is a principal threat to divers from air cylinders filled at non-certified locations. Carbon monoxide is a poisonous gas that can cause serious health issues and even death when breathed in at high concentrations. Non-certified locations may not have proper procedures in place to ensure the purity of the air being filled into the cylinders, increasing the risk to divers. It is important for divers to ensure that their air cylinders are filled at certified locations to minimize the risk of exposure to harmful gases.

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29.

When buddy breathing using a single, second-stage regulator, it is most important to:
- A.
  
  Maintain control of one's own air source (regulator)
- B.
  
  Give your buddy as much air as he or she needs to calm down
- C.
  
  Ascend as quickly as possible, even if it means risking "the bends."
- D.
  
  Hold your breath tightly when your buddy is breathing off your regulator
Correct Answer
A. Maintain control of one's own air source (regulator)

Explanation
When buddy breathing using a single, second-stage regulator, it is most important to maintain control of one's own air source (regulator). This means that each diver should hold onto their own regulator and not let go of it, ensuring that they have a continuous supply of air. This is crucial for their safety and allows them to have control over their own breathing and air consumption. It also ensures that they can respond to any emergency situations that may arise during the dive.

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30.

Pure oxygen is a safe, harmless gas to breathe when SCUBA diving
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
Pure oxygen is actually not safe to breathe when SCUBA diving. Breathing pure oxygen at depths can cause oxygen toxicity, which can lead to seizures, unconsciousness, and even death. SCUBA divers typically breathe a mixture of oxygen and other gases, such as nitrogen or helium, to avoid this risk.

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31.

By law, SCUBA cylinders must be visually inspected ____________________ and hydrostatically tested _____________________.
- A.
  
  Annually, every 3 years
- B.
  
  Annually, every 5 years
- C.
  
  With every air fill, annually
- D.
  
  When dented, when showing visible signs of corrosion
Correct Answer
B. Annually, every 5 years

Explanation
SCUBA cylinders must be visually inspected annually to check for any visible signs of damage or corrosion. Additionally, they must undergo hydrostatic testing every 5 years to ensure their structural integrity and safety. This regular inspection and testing schedule is mandated by law to ensure that the cylinders are in proper working condition and do not pose any risks to divers.

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32.

A mask squeeze is caused by:
- A.
  
  Rapid ascent, decreased pressure causing your mask to loosen
- B.
  
  Rapid descent, increased pressure forcing the mask onto your face
- C.
  
  Accidentally inhaling water through your nose
- D.
  
  None of the above
Correct Answer
B. Rapid descent, increased pressure forcing the mask onto your face

Explanation
A mask squeeze is caused by a rapid descent, which leads to increased pressure forcing the mask onto your face. As you descend deeper underwater, the water pressure increases, and this can cause the mask to squeeze against your face. This can be uncomfortable and may even cause pain or injury if the pressure is too great. It is important to equalize the pressure in your mask by exhaling through your nose or using a mask clearing technique to prevent mask squeeze.

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33.

An overexpansion injury to the lungs, or Pulmonary Over-Inflation Syndrome, is caused by:
- A.
  
  Escape of air into the pleural cavity
- B.
  
  Expansion of air into the tissues surrounding the heart
- C.
  
  Damage to lung alveoli from expansion of air during a rapid ascent when the diver is holding his/her breath
- D.
  
  None of these
Correct Answer
C. Damage to lung alveoli from expansion of air during a rapid ascent when the diver is holding his/her breath

Explanation
An overexpansion injury to the lungs, or Pulmonary Over-Inflation Syndrome, occurs when the lung alveoli (air sacs) are damaged due to the expansion of air during a rapid ascent while holding one's breath. When a diver holds their breath and ascends quickly, the expanding air in the lungs can cause the alveoli to rupture or burst, leading to lung injuries. This is why it is important for divers to exhale continuously during ascent to prevent overexpansion injuries. The other options mentioned, such as escape of air into the pleural cavity or expansion of air into the tissues surrounding the heart, do not directly cause this specific type of lung injury.

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34.

To maintain neutral buoyancy while changing depth during a dive, the diver must
- A.
  
  Ditch weight pockets/weight belt
- B.
  
  Add or release small squirts of air in your BCD appropriate for your diving depth
- C.
  
  Exhale until you sink to the bottom
- D.
  
  None of these
Correct Answer
B. Add or release small squirts of air in your BCD appropriate for your diving depth

Explanation
To maintain neutral buoyancy while changing depth during a dive, the diver must add or release small squirts of air in their BCD appropriate for their diving depth. This is because as the diver descends, the water pressure increases, causing their body and equipment to compress and become denser. By adding air to the BCD, the diver can counteract this increased density and maintain neutral buoyancy. Similarly, as the diver ascends, the water pressure decreases, causing their body and equipment to expand and become less dense. Releasing air from the BCD allows the diver to adjust their buoyancy and stay neutral throughout the dive.

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35.

A typical three-gauge console consists of:
- A.
  
  A compass, a submersible pressure gauge, and a depth gauge
- B.
  
  A watch, a flashlight, and waterproof dive tables
- C.
  
  A compass, pressure gauge, and a dive computer
- D.
  
  A or C above
- E.
  
  None of the above
Correct Answer
D. A or C above

Explanation
A typical three-gauge console consists of a compass, a submersible pressure gauge, and a depth gauge. However, it can also consist of a compass, pressure gauge, and a dive computer. Both options A and C include a compass and a pressure gauge, making them the correct answers.

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36.

Key reasons to wear an exposure suit include:
- A.
  
  Keep your body warm in colder water
- B.
  
  Prevent sunburn
- C.
  
  Protect from scrapes and stings
- D.
  
  Only A & C above
- E.
  
  A, B & C above
Correct Answer
E. A, B & C above

Explanation
An exposure suit is worn to keep the body warm in colder water, prevent sunburn, and protect from scrapes and stings. Wearing an exposure suit helps to maintain body temperature in cold water by providing insulation. It also acts as a barrier against harmful UV rays from the sun, preventing sunburn. Additionally, exposure suits are designed to protect the skin from scrapes and stings that may be encountered while diving or swimming in various environments. Therefore, the correct answer is A, B & C above.

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37.

When clearing water from inside a mask fitted with a purge valve, the diver should:
- A.
  
  Look up, hold the top of the mask to the forehead, and exhale through the nose until the water is cleared
- B.
  
  Look down, hold the top of the mask to the forehead, and exhale through the nose until the water is cleared
- C.
  
  Ascend and drain the mask of water at the surface
- D.
  
  Any of the above will work
Correct Answer
B. Look down, hold the top of the mask to the forehead, and exhale through the nose until the water is cleared

Explanation
The correct answer is to look down, hold the top of the mask to the forehead, and exhale through the nose until the water is cleared. This method allows the water to flow out of the mask through the purge valve, which is located at the bottom of the mask. By looking down, the diver ensures that the water will flow out of the mask and not back into it. Holding the top of the mask to the forehead helps create a seal and prevents water from entering the mask. Exhaling through the nose helps to clear any remaining water from the mask.

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1
38.

Choice of a dive site should most importantly include assessment of several key conditions:
- A.
  
  Beach erosion and offshore storms affecting the dive site
- B.
  
  Water temperature and diver experience
- C.
  
  Tides, wind direction/speed, wave height/period at the dive site
- D.
  
  Available parking and toilets
Correct Answer
C. Tides, wind direction/speed, wave height/period at the dive site

Explanation
When choosing a dive site, it is crucial to assess the tides, wind direction/speed, and wave height/period at the location. These factors directly impact the safety and comfort of the divers. Tides can affect the visibility and currents underwater, while wind direction/speed and wave height/period determine the surface conditions. By considering these conditions, divers can ensure a smooth and enjoyable dive experience. The other factors mentioned, such as beach erosion, offshore storms, water temperature, diver experience, available parking, and toilets, may also be important but are not as critical as the assessment of tides, wind, and waves.

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39.

Water cools exposed skin at a rate ____________ than air.
- A.
  
  10 times faster
- B.
  
  25 times slower
- C.
  
  25 times faster
- D.
  
  50 times faster
Correct Answer
C. 25 times faster

Explanation
Water cools exposed skin at a rate 25 times faster than air because water has a higher thermal conductivity compared to air. This means that heat is transferred more efficiently from the skin to the water, resulting in a faster cooling effect. Additionally, water has a higher specific heat capacity, meaning it can absorb more heat energy before its temperature rises significantly. This combination of higher thermal conductivity and specific heat capacity makes water a more effective coolant for the skin compared to air.

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40.

When descending at a dive site, divers must clear their ears _______________________ and ____________________ to avoid discomfort and possible damage to ears.
- A.
  
  Hard, quickly
- B.
  
  Early, often
- C.
  
  Slowly, subtlely
- D.
  
  Quickly, quietly
Correct Answer
B. Early, often

Explanation
When descending at a dive site, divers must clear their ears early and often to avoid discomfort and possible damage to ears. This is because as divers descend, the pressure on their ears increases. By clearing their ears early and often, divers equalize the pressure inside their ears with the surrounding water pressure, preventing discomfort and potential damage to their eardrums. This can be done by swallowing, yawning, or performing the Valsalva maneuver.

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41.

Collecting marine life when diving is acceptable:
- A.
  
  When the Marine Warden isn't nearby
- B.
  
  As long as there is plenty more present at the dive site
- C.
  
  It is done in accordance with local laws and understood conservation methods
- D.
  
  Only if the marine life is to be consumed as food
Correct Answer
C. It is done in accordance with local laws and understood conservation methods

Explanation
Collecting marine life when diving is acceptable if it is done in accordance with local laws and understood conservation methods. This means that divers should be aware of and follow any regulations or guidelines set by the local authorities to ensure the sustainability and protection of marine ecosystems. By adhering to these laws and conservation methods, divers can minimize their impact on the marine environment while still being able to collect marine life.

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42.

After successfully completing the classroom and confined water portion of a certification class, to become a NAUI-certified SCUBA diver, you must complete ________________ open water dives, with an instructor in the ocean or in a lake.
- A.
  
  3
- B.
  
  5
- C.
  
  7
- D.
  
  10
Correct Answer
B. 5

Explanation
To become a NAUI-certified SCUBA diver, after completing the classroom and confined water portion of the certification class, you are required to complete 5 open water dives with an instructor in the ocean or in a lake. These open water dives provide you with the opportunity to apply the knowledge and skills learned in the classroom and confined water sessions in a real-world diving environment. It allows you to gain practical experience and build confidence in your diving abilities under the guidance and supervision of an instructor.

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43.

A regulator set has two components to regulate air pressure, called:
- A.
  
  The first stage and the second stage
- B.
  
  The yoke and the mouthpiece
- C.
  
  The pre-dive knob and the purge button
- D.
  
  The octo and the power inflator
Correct Answer
A. The first stage and the second stage

Explanation
The correct answer is "The first stage and the second stage." In scuba diving, a regulator set is used to regulate the air pressure from the tank to a breathable level. The first stage of the regulator reduces the high-pressure air from the tank to an intermediate pressure, while the second stage further reduces the pressure to a level that is comfortable for the diver to breathe. These two components work together to ensure a consistent and safe supply of air while diving.

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44.

Your submersible pressure gauge is connected to your SCUBA cylinder via a __________________ in your first stage regulator.
- A.
  
  High-pressure port
- B.
  
  Second stage regulator
- C.
  
  Low-pressure port
- D.
  
  None of these
Correct Answer
A. High-pressure port

Explanation
The correct answer is high-pressure port. A submersible pressure gauge is connected to a SCUBA cylinder via the high-pressure port in the first stage regulator. This port is designed to handle the high-pressure air coming from the cylinder and allows the pressure gauge to accurately measure the pressure inside the cylinder. The high-pressure port is typically located on the side or top of the first stage regulator and is specifically designed for this purpose. The second stage regulator is responsible for delivering air to the diver, not for connecting the pressure gauge. The low-pressure port is used for connecting other equipment, such as the second stage regulator or an alternate air source.

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45.

"Skip breathing" is a technique you should:
- A.
  
  Use when deep diving to maximize bottom time
- B.
  
  Use during decompression stops to off-gas nitrogen
- C.
  
  Only use to minimize exhaled bubbles during underwater photography
- D.
  
  Never use
Correct Answer
D. Never use

Explanation
"Skip breathing" is a technique where a diver intentionally skips breaths to conserve air while underwater. This technique is not recommended as it can lead to an increased risk of hypoxia, which is a condition of oxygen deprivation. It is important for divers to maintain a regular breathing pattern to ensure a sufficient oxygen supply and prevent any potential dangers associated with oxygen deprivation. Therefore, the correct answer is "Never use."

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46.

NAUI recommends that all divers perform a "safety stop" at 10 meters (33 feet) during ascent.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
NAUI does not recommend that all divers perform a "safety stop" at 10 meters (33 feet) during ascent. A safety stop is typically performed at a depth of 3-5 meters (10-15 feet) for a duration of 3 minutes to allow for off-gassing and to reduce the risk of decompression sickness. The depth and duration of a safety stop may vary depending on the dive profile and the diver's certification level, but it is generally not recommended to perform a safety stop at 10 meters (33 feet).

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47.

If you run out of air while diving with your buddy and do not have equipment for contingency scuba, the best course of action is to:
- A.
  
  Buddy breathe and use your manual inflator in your BCD to get to the surface as quickly as possible
- B.
  
  Hold your breath and ascend as quickly as possible
- C.
  
  Give the out of air sign and breathe off your buddy's alternate air source (octopus 2nd stage regulator)
- D.
  
  None of the above
Correct Answer
C. Give the out of air sign and breathe off your buddy's alternate air source (octopus 2nd stage regulator)

Explanation
In the given scenario, if you run out of air while diving and do not have contingency scuba equipment, the best course of action would be to give the out of air sign and breathe off your buddy's alternate air source (octopus 2nd stage regulator). This is because your buddy's alternate air source can provide you with the necessary air to continue breathing underwater until you can safely ascend to the surface. Buddy breathing is a common technique used in emergency situations to share air with a diving partner.

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48.

Most encounters with marine animals leading to injuries occur because:
- A.
  
  The animal is aggressive and wants to hurt you
- B.
  
  The animal is trying to mate with you
- C.
  
  The animal thinks you are lunch
- D.
  
  The animal is scared of you and is trying to defend itself
Correct Answer
D. The animal is scared of you and is trying to defend itself

Explanation
Marine animals may attack and cause injuries because they are scared of humans and are trying to defend themselves. When humans approach or invade their territory, marine animals may perceive it as a threat and react aggressively in order to protect themselves. This defensive behavior is a natural response to perceived danger and is often the cause of encounters leading to injuries.

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49.

Of these options, check off all the parts of your body with air cavities most likely impacted by changes in pressure while diving:
- A.
  
  Stomach
- B.
  
  Ears
- C.
  
  Heart
- D.
  
  Lungs
- E.
  
  Bone marrow
- F.
  
  Blood vessels
- G.
  
  Sinuses
- H.
  
  Teeth
- I.
  
  Joints
Correct Answer(s)
B. Ears
D. Lungs
G. Sinuses

Explanation
The correct answer is ears, lungs, and sinuses. These three body parts have air cavities that are most likely impacted by changes in pressure while diving. The ears can experience pressure changes that can cause discomfort or even damage to the eardrums. The lungs can also be affected by pressure changes, especially during ascent and descent, which can lead to lung overexpansion injuries. The sinuses can become congested or experience pain due to pressure changes. The other body parts listed do not have air cavities and are not directly impacted by pressure changes while diving.

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50.

Divers are at risk of heat stroke when:
- A.
  
  They dive too close to the surface on sunny days
- B.
  
  They put on their wet/dry suits too early before a dive on a warm or sunny day
- C.
  
  They pour hot water down their wetsuit to stay warm
- D.
  
  None of the above
Correct Answer
B. They put on their wet/dry suits too early before a dive on a warm or sunny day

Explanation
Divers are at risk of heat stroke when they put on their wet/dry suits too early before a dive on a warm or sunny day. This is because wet/dry suits are designed to insulate the body and retain heat. Wearing them too early can cause the body to overheat, especially in warm or sunny conditions. Heat stroke occurs when the body's temperature regulation system fails, leading to dangerously high body temperatures. Therefore, putting on wet/dry suits too early in such conditions increases the risk of heat stroke for divers.

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Naui Basic Diver Practice Quiz

The top five gasses found in normal (atmospheric) air by volume are:

The absolute pressure exerted by the Earth's atmosphere on a person standing on the shore at sea level is:

The absolute pressure exerted on a diver at 10 meters (33 feet) in sea water is:

The primary factors determining your air consumption rate are:

When selecting a wet suit, key factors to consider include:

A dry suit is used for:

When diving a new dive site it is best to:

Special hazards that exist in and around wrecks include:

NAUI recommends that divers observe a _____________ Surface Interval Time (SIT) between repetitive dives.

"Rapture of the Deep" is an intoxicated, euphoric feeling sometimes experienced by divers, which is more formally known as:

When consuming alcoholic beverages, divers should:

Objects under water may appear __________________ and ____________________ than on land.

Decompression sickness, or "the bends" occurs when:

The "Lost Buddy Procedure" includes the following steps:

The benefit of the Push method of tired diver recovery, where the rescuer pushes the tired diver while holding the tired diver's fins to their shoulders include:

Ripples in a sandy bottom, rock formation, sun direction, and wave action are all forms of natural navigation.

Naturally occurring magnetic minerals (such as magnetite) in rocks/ledge on the bottom can throw off your compass, making compass navigation more difficult.

Divers should breathe ______________________ and ___________________ than they would on land.

The "Giant Stride" entry is characterized by:

If you are feeling short of breath on a dive, you must ________________________, ______________________ and ______________________.

A diver should never allow SCUBA cylinders to:

Contingency SCUBA can be characterized by:

Salt water is:

Archimedes' Principle states that:

There are several distinct styles of buoyancy compensating devices (BCDs), including:

As a diver descends, his or her neoprene wet suit will become compressed, slightly reducing its insulating value and making it less buoyant.

Hand signals:

A principal threat to divers from air cylinders filled at non-certified locations is:

When buddy breathing using a single, second-stage regulator, it is most important to:

Pure oxygen is a safe, harmless gas to breathe when SCUBA diving

By law, SCUBA cylinders must be visually inspected ____________________ and hydrostatically tested _____________________.

A mask squeeze is caused by:

An overexpansion injury to the lungs, or Pulmonary Over-Inflation Syndrome, is caused by:

To maintain neutral buoyancy while changing depth during a dive, the diver must

A typical three-gauge console consists of:

Key reasons to wear an exposure suit include:

When clearing water from inside a mask fitted with a purge valve, the diver should:

Choice of a dive site should most importantly include assessment of several key conditions:

Water cools exposed skin at a rate ____________ than air.

When descending at a dive site, divers must clear their ears _______________________ and ____________________ to avoid discomfort and possible damage to ears.

Collecting marine life when diving is acceptable:

After successfully completing the classroom and confined water portion of a certification class, to become a NAUI-certified SCUBA diver, you must complete ________________ open water dives, with an instructor in the ocean or in a lake.

A regulator set has two components to regulate air pressure, called:

Your submersible pressure gauge is connected to your SCUBA cylinder via a __________________ in your first stage regulator.

"Skip breathing" is a technique you should:

NAUI recommends that all divers perform a "safety stop" at 10 meters (33 feet) during ascent.

If you run out of air while diving with your buddy and do not have equipment for contingency scuba, the best course of action is to:

Most encounters with marine animals leading to injuries occur because:

Of these options, check off all the parts of your body with air cavities most likely impacted by changes in pressure while diving:

Divers are at risk of heat stroke when:

Objects under water may appear and __ than on land.

Divers should breathe ____ and _ than they would on land.

If you are feeling short of breath on a dive, you must , and .

By law, SCUBA cylinders must be visually inspected and hydrostatically tested _.

When descending at a dive site, divers must clear their ears ___ and to avoid discomfort and possible damage to ears.