Naui Basic Diver Practice Quiz

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

About This Quiz

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 See moredive certification and membership organization established to provide international diver standards and education programs. All the best to you!

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2.

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

A. 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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3.

A dive knife is:
- An alternative to a speargun to skewer fish
- A weapon to ward off aggressive marine life
- An important piece of safety equipment and a useful tool
- A flashy accessory used to gain acceptance with other divers
Correct Answer

A. An important piece of safety equipment and a useful tool

Explanation

A dive knife is an important piece of safety equipment and a useful tool because it can be used in various situations underwater. It can be used to cut through entangled fishing lines or ropes, free oneself from underwater obstacles, or even to defend against aggressive marine life if necessary. Additionally, it can serve as a versatile tool for tasks such as prying open shells or tightening equipment. Therefore, a dive knife is not just a weapon or a flashy accessory, but a practical and essential item for divers.

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4.

After diving, your equipment should be
- Placed in your dive bag and put in the closet for safe keeping
- Wrung out vigorously or put in the clothes dryer
- Rinsed, hung, and allowed to dry in a cool dry place
- Draped over a radiator or hung near a wood stove
Correct Answer

A. Rinsed, hung, and allowed to dry in a cool dry place

Explanation

After diving, it is important to rinse your equipment to remove any saltwater or debris that may have accumulated. Hanging the equipment allows it to air dry properly, preventing the growth of mold or mildew. A cool dry place is ideal for drying the equipment as excessive heat can damage certain materials. This ensures that the equipment is properly cleaned and dried, ready for the next use.

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1
5.

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

A. 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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6.

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

A. 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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7.

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

A. 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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8.

Low visibility at the dive site can be caused by
- Silt or mud kicked up from a still bottom
- Sand, powdered coral, or other particles churned up by currents/waves
- Tiny organisms (plankton) floating in the water
- Cloudy weather conditions
- Any/all of the above
Correct Answer

A. Any/all of the above

Explanation

Low visibility at a dive site can be caused by any or all of the mentioned factors. Silt or mud kicked up from a still bottom can reduce visibility by suspending particles in the water. Similarly, sand, powdered coral, or other particles churned up by currents or waves can also decrease visibility. Additionally, tiny organisms like plankton floating in the water can contribute to low visibility. Cloudy weather conditions can further reduce visibility by blocking sunlight and creating a murky atmosphere. Therefore, any combination of these factors can lead to low visibility at a dive site.

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9.

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

A. 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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10.

A rapid change in water temperature, typically in still or fresh water, happens at the:
- Microcline
- Anticline
- Thermocline
- Hypocline
Correct Answer

A. Thermocline

Explanation

A rapid change in water temperature, typically in still or fresh water, occurs at the thermocline. The thermocline is a layer in a body of water where there is a significant change in temperature between the warmer surface water and the colder deeper water. This change in temperature can occur quite rapidly, creating a distinct boundary between the two layers. The thermocline is important for aquatic ecosystems as it affects the distribution of oxygen and nutrients in the water, and can impact the behavior and distribution of aquatic organisms.

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11.

Dive buddies should always:
- Be connected by a rope so they do not become separated
- Wear matching equipment
- Agree upon a leader and be in constant visual contact
- Notify local rescue authorities about intended dive plans
Correct Answer

A. Agree upon a leader and be in constant visual contact

Explanation

Dive buddies should always agree upon a leader and be in constant visual contact to ensure their safety during the dive. This is important because having a designated leader helps in coordinating the dive and making decisions. Being in constant visual contact allows them to monitor each other's well-being and quickly respond in case of any emergencies or issues that may arise underwater. It helps to maintain communication and ensure that the dive buddies stay together throughout the dive, minimizing the risk of getting lost or separated.

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12.

True or False: If your power inflator button becomes stuck or broken, you can add air manually to your BCD to increase buoyancy.
- True
- False
Correct Answer

A. True

Explanation

If the power inflator button on a BCD becomes stuck or broken, it is still possible to manually add air to the BCD to increase buoyancy. This can be done by using the oral inflator, which is a separate mechanism on the BCD that allows the diver to manually inflate the BCD by blowing air into it. This can be a useful technique in emergency situations where the power inflator is not functioning properly.

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13.

Maintaining neutral buoyancy and preventing bottom contact on a dive is important because
- Bottom contact can stir up debris and reduce visibility
- Touching coral, sponges or other marine organisms can easily cause harm or death to the organism
- Diving at the bottom poses risk of accidental scrapes on rocks/coral and stings from marine organisms
- All of the above
Correct Answer

A. All of the above

Explanation

Maintaining neutral buoyancy and preventing bottom contact on a dive is important because it can stir up debris and reduce visibility, touching coral, sponges or other marine organisms can easily cause harm or death to the organism, and diving at the bottom poses a risk of accidental scrapes on rocks/coral and stings from marine organisms. Therefore, all of the above reasons make it crucial to maintain neutral buoyancy and avoid bottom contact during a dive.

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1
14.

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

A. 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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1
15.

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

A. 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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2
16.

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

A. 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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17.

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

A. 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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1
18.

Boyle's Law tells us that as we take a balloon to the bottom of a pool of fresh water, the air in the balloon
- Will expand and the balloon will rupture
- Will become compressed and decrease in volume
- Cannot be compressed, and the balloon will rupture
- Cannot be compressed and will remain unchanged.
Correct Answer

A. Will become compressed and decrease in volume

Explanation

According to Boyle's Law, the pressure and volume of a gas are inversely proportional when temperature is constant. When a balloon is taken to the bottom of a pool of fresh water, the pressure exerted by the water increases due to the weight of the water above it. As a result, the air inside the balloon will experience an increase in pressure, causing it to become compressed. Since the volume and pressure are inversely related, the decrease in pressure will lead to a decrease in volume of the air inside the balloon. Therefore, the correct answer is that the air in the balloon will become compressed and decrease in volume.

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2
19.

Which of these does not affect buoyancy?
- Diver's lead in weight pockets
- Diver's depth
- Diver's Residual Nitrogen Time
- Diver's breathing (inhaling/exhaling)
Correct Answer

A. Diver's Residual Nitrogen Time
20.

The safe diver's motto is to "__________ your dive and then ______________ your plan"
- Understand, document
- Photograph, communicate
- Plan, dive
- Think about, remember
Correct Answer

A. Plan, dive

Explanation

The safe diver's motto is to "Plan your dive and then dive your plan." This means that before starting a dive, it is important to carefully plan and prepare for it, considering factors such as depth, duration, equipment, and potential risks. Once the plan is established, the diver should then follow it during the dive, ensuring they stick to the planned route, depth limits, and safety procedures. By emphasizing the importance of planning and adhering to the plan, this motto promotes safe and responsible diving practices.

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21.

High-performance regulators are used:
- In deep dives
- In technical/commercial dives
- In wreck dives
- In ice diving or diving in very cold water
- All of the above
Correct Answer

A. All of the above

Explanation

High-performance regulators are designed to provide superior performance and reliability in various diving conditions. Deep dives require regulators that can deliver air at extreme depths, while technical and commercial dives often involve longer durations and higher breathing rates, necessitating regulators with enhanced airflow capabilities. Wreck dives may involve navigating through tight spaces or debris, requiring regulators with compact and streamlined designs. Lastly, diving in cold water or ice diving requires regulators that can withstand freezing temperatures and deliver air smoothly. Therefore, high-performance regulators are suitable for all the mentioned diving scenarios.

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22.

Ripples in a sandy bottom, rock formation, sun direction, and wave action are all forms of natural navigation.
- True
- 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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1
23.

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

A. 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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1
24.

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

A. 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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25.

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

A. 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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26.

When you are neutrally buoyant, inhalation will cause you to ________________ and exhalation will cause you to _____________
- Descend slightly, ascend slightly
- Ascend slightly, descend slightly
- Get dizzy, body roll
- Ingas, outgas
Correct Answer

A. Ascend slightly, descend slightly

Explanation

When you are neutrally buoyant, inhalation will cause you to ascend slightly and exhalation will cause you to descend slightly. This is because when you inhale, your lungs fill with air, increasing your overall volume and buoyancy. This causes you to become slightly positively buoyant, causing you to ascend. Conversely, when you exhale, your lungs empty and your volume decreases, making you slightly negatively buoyant, causing you to descend.

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27.

SCUBA cylinders should always be stored with at least a small amount of pressurized air remaining in them to:
- Tell the dive shop staff they need to be refilled
- Keep the valve from sticking
- Keep out dust and debris
- Prevent water/moisture from entering and causing rust/corrosion
Correct Answer

A. Prevent water/moisture from entering and causing rust/corrosion

Explanation

Storing SCUBA cylinders with at least a small amount of pressurized air remaining in them prevents water/moisture from entering and causing rust/corrosion. When the cylinder is pressurized, it creates a barrier that prevents water or moisture from entering the cylinder. This is important because water or moisture can cause rust and corrosion, which can compromise the integrity of the cylinder and potentially lead to dangerous situations while diving. Keeping the cylinder pressurized helps to maintain its condition and prolong its lifespan.

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2
28.

Muscle cramps in the extremities and core muscles can occur due to:
- Exertion
- Dehydration
- Cold water
- Any/All of the above
Correct Answer

A. Any/All of the above

Explanation

Muscle cramps in the extremities and core muscles can occur due to any or all of the mentioned factors: exertion, dehydration, and exposure to cold water. Exertion can lead to muscle fatigue and strain, increasing the likelihood of cramps. Dehydration can cause an imbalance in electrolytes, leading to muscle cramps. Cold water can also contribute to muscle cramps by causing vasoconstriction and reducing blood flow to the muscles. Therefore, any or all of these factors can contribute to the occurrence of muscle cramps.

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29.

Mild hypothermia conditions are characterized by uncontrollable shivering, teeth chattering, and blue lips. A diver experiencing these conditions should:
- Wear a hood and gloves on the next dive
- Give the "chilled" sign to his/her buddy, surface, and warm up
- Stand in the warm sun in the wet suit for 1 hour during the surface interval time (SIT)
- Tough it out to the end of the dive - this is normal
Correct Answer

A. Give the "chilled" sign to his/her buddy, surface, and warm up

Explanation

Mild hypothermia is a condition characterized by symptoms such as uncontrollable shivering, teeth chattering, and blue lips. These symptoms indicate that the diver's body temperature has dropped significantly and immediate action is required. Giving the "chilled" sign to the buddy indicates that the diver is experiencing hypothermia and needs assistance. Surfacing and warming up is the appropriate response to prevent further cooling and to raise the diver's body temperature back to normal. Standing in the warm sun or wearing a hood and gloves may provide some relief, but they are not sufficient to address the underlying issue of hypothermia. Toughing it out to the end of the dive is not recommended as it may lead to further complications.

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30.

All of your underwater communications should be
- Agreed upon in advance before the dive
- Clear, distinct, and understandable even with gloves
- Understood and confirmed by your buddy prior to taking action
- All of the above
- None of the above
Correct Answer

A. All of the above

Explanation

The correct answer is "All of the above." This means that all of the options listed are correct explanations for how your underwater communications should be. It is important to agree upon the communication system in advance, ensure that it is clear and understandable even with gloves on, and have your buddy understand and confirm the communication before taking any action.

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0
31.

If you experience pain and cannot equalize your ears while descending for a dive, the best course of action is to:
- Block your nose and blow harder until the ears pop
- Immediately surface to avoid damage ear drums
- Ascend until you are able to clear, then continue with your dive with more frequent ear clearing
- Tough it out - it's a natural part of diving
Correct Answer

A. Ascend until you are able to clear, then continue with your dive with more frequent ear clearing
32.

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

A. 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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33.

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

A. Abstain from alcohol for at least 12 hours before diving
34.

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

A. 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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1
35.

A regulator set has two components to regulate air pressure, called:
- The first stage and the second stage
- The yoke and the mouthpiece
- The pre-dive knob and the purge button
- 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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36.

When planning repetitive dives, your ______________ dive should be your first dive
- Deepest
- Shallowest
- Longest
- Coldest
Correct Answer

A. Deepest

Explanation

When planning repetitive dives, your deepest dive should be your first dive. This is because ascending from deeper depths requires longer decompression times compared to shallower dives. By starting with the deepest dive, you can ensure that you have enough time for decompression stops and minimize the risk of decompression sickness. Additionally, starting with the deepest dive allows you to gradually ascend to shallower depths for subsequent dives, reducing the risk of nitrogen buildup in your body.

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0
37.

Out-of-air situations can be best avoided by:
- Regularly calculating your remaining bottom time during your dive
- Regularly checking your submersible pressure gauge and diving a well-designed plan
- Limiting your dives to 20 minutes
- Making sure your buddy always has more air than you do
Correct Answer

A. Regularly checking your submersible pressure gauge and diving a well-designed plan

Explanation

Regularly checking your submersible pressure gauge and diving a well-designed plan is the best way to avoid out-of-air situations. By regularly checking the pressure gauge, you can ensure that you have enough air to complete your dive safely. Diving with a well-designed plan means that you have planned your dive properly, taking into consideration factors such as depth, time, and air consumption. This helps in managing your air supply effectively and prevents running out of air during the dive.

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38.

What is meant by "residual nitrogen?"
- The calculation of nitrogen gas remaining in your cylinder at the end of your dive
- The small amount of nitrogen remaining in blended gasses like nitrox or trimix
- The remaining 500 PSI of air in your cylinder at the end of your dive
- The amount of excess nitrogen remaining in your body after diving
Correct Answer

A. The amount of excess nitrogen remaining in your body after diving

Explanation

Residual nitrogen refers to the amount of excess nitrogen that remains in the body after diving. When diving, the body absorbs nitrogen from the compressed air inhaled. During ascent, the body needs to eliminate this excess nitrogen gradually to avoid decompression sickness. The concept of residual nitrogen is crucial in dive planning and determining surface intervals between dives to ensure safe decompression.

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39.

True or False: You and your buddy hear a dive boat in the distance, and it is getting louder. You are diving with a dive flag. You should ascend immediately to the dive flag and wave to the boater to keep away from your dive site.
- True
- False
Correct Answer

A. False

Explanation

The correct answer is False because when you hear a dive boat in the distance and it is getting louder, you should not ascend immediately to the dive flag and wave to the boater to keep away from your dive site. Instead, you should ascend slowly and safely to the surface, while continuously monitoring your surroundings and maintaining a lookout for the boat. Once at the surface, you should signal to the boat that you are there by waving your dive flag, but you should not use it as a means to keep the boat away from your dive site. It is important to communicate with the boat and ensure that they are aware of your presence to avoid any potential accidents.

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40.

As you ascend from a dive, any air remaining in your BCD will:
- Remain unchanged
- Expand and become more buoyant
- Compress and become less buoyant
- Likely to burst your BDC or cause an uncontrolled ascent to the surface
Correct Answer

A. Expand and become more buoyant

Explanation

As you ascend from a dive, the pressure surrounding your BCD decreases. This decrease in pressure causes any air remaining in the BCD to expand. As the air expands, it takes up more space and becomes less dense, making it more buoyant. This increased buoyancy helps to counteract the weight of the diver and their equipment, allowing for a controlled ascent.

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41.

Cloudy conditions at the dive site will:
- Increase visibility
- Decrease visibility
- Decrease water temperature
- Improve marine life sightings
Correct Answer

A. Decrease visibility

Explanation

Cloudy conditions at a dive site will decrease visibility because clouds block sunlight from reaching the water's surface, resulting in reduced light penetration. This reduces the amount of light available for divers to see underwater, making it harder to see clearly and decreasing visibility.

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42.

After a week of diving at the resort, you should wait ___________________ before flying home.
- 12 hours
- 24 hours
- 3 days
- 7 days
Correct Answer

A. 24 hours

Explanation

After a week of diving at the resort, you should wait 24 hours before flying home. This is because diving can cause the body to absorb nitrogen, which can lead to decompression sickness if not given enough time to safely release from the body. Waiting 24 hours allows the body to eliminate the excess nitrogen and reduces the risk of decompression sickness during the flight.

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43.

Naturally occurring magnetic minerals (such as magnetite) in rocks/ledge on the bottom can throw off your compass, making compass navigation more difficult.
- True
- 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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44.

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

A. 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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2
45.

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

A. 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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2
46.

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:
- Buddy breathe and use your manual inflator in your BCD to get to the surface as quickly as possible
- Hold your breath and ascend as quickly as possible
- Give the out of air sign and breathe off your buddy's alternate air source (octopus 2nd stage regulator)
- None of the above
Correct Answer

A. 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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1
47.

A diver's buoyancy goal throughout a dive is to:
- Get negatively buoyant as quickly as possible to descend to depth
- Get positively buoyant as quickly as possible to ascend to the surface
- Remain neutrally buoyant regardless of depth for the duration of the dive
- Remain at the same buoyancy compared to your buddy so you never get lost or separated
- Keep exactly the same amount of air in the BCD to maintain neutral buoyancy, regardless of depth
Correct Answer

A. Remain neutrally buoyant regardless of depth for the duration of the dive

Explanation

The correct answer is to remain neutrally buoyant regardless of depth for the duration of the dive. This means that the diver should adjust their buoyancy to be neither sinking nor floating, allowing them to maintain a stable position in the water column. This is important for maintaining control and conserving energy during the dive, as well as for minimizing the impact on the underwater environment.

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48.

There is no need to wear a wet suit or skin suit when diving in a tropical destination, since the water will be so warm
- True
- False
Correct Answer

A. False

Explanation

This statement is false because even in tropical destinations, the water temperature can vary and may not always be warm enough to dive comfortably without a wet suit or skin suit. Divers often wear wet suits to protect themselves from cold water, jellyfish stings, and other potential hazards. Therefore, it is incorrect to assume that a wet suit or skin suit is not needed when diving in a tropical destination solely based on the assumption that the water will always be warm.

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1
49.

The parts of the ear affected by changes in pressure from diving are:
- The tympanic cavity and the auditory nerve
- The ear drum and the eustachian tube
- The cochlea and the ossicles (semi-circular canals)
- The peristaltic nerve and the sinusoidal passage
Correct Answer

A. The ear drum and the eustachian tube

Explanation

When diving, changes in pressure can affect the ear drum and the eustachian tube. The ear drum, also known as the tympanic membrane, is a thin, sensitive membrane that separates the outer ear from the middle ear. It vibrates in response to sound waves and transmits them to the middle ear. The eustachian tube, on the other hand, is a narrow tube that connects the middle ear to the back of the throat. It helps equalize the pressure between the middle ear and the environment, allowing the ear drum to function properly. Changes in pressure during diving can cause the ear drum to become stretched or damaged, and can also lead to blockages or dysfunction in the eustachian tube, resulting in discomfort or even hearing loss.

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Feb 01, 2014

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Most encounters with marine animals leading to injuries occur because:

A dive knife is:

After diving, your equipment should be

Special hazards that exist in and around wrecks include:

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

Collecting marine life when diving is acceptable:

Low visibility at the dive site can be caused by

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

A rapid change in water temperature, typically in still or fresh water, happens at the:

Dive buddies should always:

True or False: If your power inflator button becomes stuck or broken, you can add air manually to your BCD to increase buoyancy.

Maintaining neutral buoyancy and preventing bottom contact on a dive is important because

Decompression sickness, or "the bends" occurs when:

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

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

The "Giant Stride" entry is characterized by:

Boyle's Law tells us that as we take a balloon to the bottom of a pool of fresh water, the air in the balloon

Which of these does not affect buoyancy?

The safe diver's motto is to "__________ your dive and then ______________ your plan"

High-performance regulators are used:

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

A mask squeeze is caused by:

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

"Skip breathing" is a technique you should:

When you are neutrally buoyant, inhalation will cause you to ________________ and exhalation will cause you to _____________

SCUBA cylinders should always be stored with at least a small amount of pressurized air remaining in them to:

Muscle cramps in the extremities and core muscles can occur due to:

Mild hypothermia conditions are characterized by uncontrollable shivering, teeth chattering, and blue lips. A diver experiencing these conditions should:

All of your underwater communications should be

If you experience pain and cannot equalize your ears while descending for a dive, the best course of action is to:

When diving a new dive site it is best to:

When consuming alcoholic beverages, divers should:

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

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

When planning repetitive dives, your ______________ dive should be your first dive

Out-of-air situations can be best avoided by:

What is meant by "residual nitrogen?"

True or False: You and your buddy hear a dive boat in the distance, and it is getting louder. You are diving with a dive flag. You should ascend immediately to the dive flag and wave to the boater to keep away from your dive site.

As you ascend from a dive, any air remaining in your BCD will:

Cloudy conditions at the dive site will:

After a week of diving at the resort, you should wait ___________________ before flying home.

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.

A diver should never allow SCUBA cylinders to:

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 diver's buoyancy goal throughout a dive is to:

There is no need to wear a wet suit or skin suit when diving in a tropical destination, since the water will be so warm

The parts of the ear affected by changes in pressure from diving are:

Objects under water may appear and __ than on land.

The safe diver's motto is to " your dive and then ____ your plan"

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

When you are neutrally buoyant, inhalation will cause you to ____ and exhalation will cause you to _

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