NAUI FINAL TEST REVIEW – QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED ANSWERS
| PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
Core Domains
1. Diving Physics and Physiology
2. Diving Equipment and Technology
3. Dive Planning and Environment
4. Decompression Theory and Tables
5. Dive Safety and Emergency Procedures
6. NAUI Standards and Regulations
7. Professional Ethics and Responsibilities
8. Advanced Diving Techniques and Specialties
Introduction
This comprehensive examination is designed to assess the candidate's mastery of the foundational and
applied knowledge required for NAUI certification. It evaluates proficiency in diving physics, equipment
functionality, dive planning, decompression management, and emergency response. The exam integrates
theoretical principles with practical, real-world scenarios to test critical thinking and decision-making
skills under pressure. Candidates will demonstrate their understanding of NAUI's professional standards,
ethical responsibilities, and safety protocols. The assessment comprises multiple-choice questions that
require both recall of facts and application of concepts to complex diving situations, ensuring readiness
for professional-level diving activities.
SECTION ONE: QUESTIONS 1-100
1. According to Boyle's Law, if a diver descends from the surface to 33 feet (2 ata) in seawater, the
volume of a gas-filled flexible container will:
A. Increase to twice its original volume
B. Decrease to half its original volume
C. Remain the same
D. Decrease to one-quarter of its original volume
🟢 B. Decrease to half its original volume
🔴 Explanation: Boyle's Law states that at a constant temperature, the volume of a gas is inversely
proportional to the absolute pressure. At 33 feet (2 ata), the pressure is double that at the surface (1
ata), so the volume is halved.
2. Which of the following best describes the primary function of the second stage of a scuba
regulator?
A. To reduce the high-pressure air from the cylinder to an intermediate pressure
B. To deliver air to the diver on demand at ambient pressure
,C. To provide a direct connection for a pressure gauge
D. To filter and dry the air before inhalation
🟢 B. To deliver air to the diver on demand at ambient pressure
🔴 Explanation: The second stage is the demand valve that senses the diver's inhalation and delivers
air at the surrounding ambient pressure, making breathing possible underwater.
3. A diver is planning a dive to 80 feet for 25 minutes using the NAUI Dive Tables. What is the
minimum surface interval required if they want to make a second dive to 60 feet for 30 minutes?
A. 0:45
B. 1:00
C. 1:30
D. 2:00
🟢 C. 1:30
🔴 Explanation: Using the NAUI tables, after the first dive, the diver would be in a specific pressure
group. To make the second dive safely, a sufficient surface interval is needed to off-gas. The required
interval is calculated from the repetitive dive tables, leading to a minimum of 1 hour and 30 minutes in
this scenario.
4. A diver experiencing a sudden, sharp pain in a joint, accompanied by a red rash and fatigue, is
most likely suffering from:
A. Nitrogen narcosis
B. Oxygen toxicity
C. Decompression sickness
D. An air embolism
🟢 C. Decompression sickness
🔴 Explanation: Joint pain, rash (cutis marmorata), and fatigue are classic symptoms of decompression
sickness (DCS), caused by nitrogen bubbles forming in tissues and blood due to rapid or excessive
decompression.
5. What is the most critical step to take if a diver shows signs of an arterial gas embolism (AGE)?
A. Administer 100% oxygen
B. Have the diver exercise to promote circulation
C. Place the diver in a head-down position
D. Transport the diver to a hyperbaric facility for recompression
🟢 A. Administer 100% oxygen
🔴 Explanation: Immediate high-flow oxygen is the first-line emergency treatment for an AGE to
support tissue oxygenation and reduce bubble size. While recompression is the definitive treatment,
oxygen must be administered without delay.
, 6. The partial pressure of oxygen (PO2) at a depth of 99 feet (4 ata) in air is approximately:
A. 0.42 atm
B. 0.84 atm
C. 1.6 atm
D. 2.0 atm
🟢 B. 0.84 atm
🔴 Explanation: The fraction of oxygen in air is 21% (0.21). At 4 ata, the PO2 is 4 ata x 0.21 = 0.84 atm.
This is a safe and calculable figure, highlighting the increase in partial pressure with depth.
7. Which of the following is a sign of an impending oxygen toxicity seizure in a diver?
A. A metallic taste in the mouth
B. Uncontrollable laughter
C. Blurred vision
D. Sharp, shooting pains in the limbs
🟢 A. A metallic taste in the mouth
🔴 Explanation: A metallic taste, along with visual or auditory disturbances (tunnel vision, ringing in
ears), nausea, and twitching, are prodromal symptoms of central nervous system oxygen toxicity.
8. The NAUI Standard Safe Diving Practices Statement emphasizes that a diver must:
A. Always dive with a buddy
B. Only dive in clear, warm water
C. Avoid diving deeper than 60 feet
D. Use a dive computer on every dive
🟢 A. Always dive with a buddy
🔴 Explanation: The buddy system is a cornerstone of NAUI's safety philosophy, providing a
redundant source of air, assistance, and emergency support.
9. A dive knife should ideally be mounted where for quick, one-handed access?
A. On the back of the cylinder
B. On the inside of the leg
C. On the weight belt
D. On the outside of the calf or lower leg
🟢 D. On the outside of the calf or lower leg
🔴 Explanation: The outside of the calf is a standard location that allows for access with either hand
without creating a snag hazard or interfering with leg movement.
10. A diver who ascends too quickly from a dive may experience decompression sickness because:
| PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
Core Domains
1. Diving Physics and Physiology
2. Diving Equipment and Technology
3. Dive Planning and Environment
4. Decompression Theory and Tables
5. Dive Safety and Emergency Procedures
6. NAUI Standards and Regulations
7. Professional Ethics and Responsibilities
8. Advanced Diving Techniques and Specialties
Introduction
This comprehensive examination is designed to assess the candidate's mastery of the foundational and
applied knowledge required for NAUI certification. It evaluates proficiency in diving physics, equipment
functionality, dive planning, decompression management, and emergency response. The exam integrates
theoretical principles with practical, real-world scenarios to test critical thinking and decision-making
skills under pressure. Candidates will demonstrate their understanding of NAUI's professional standards,
ethical responsibilities, and safety protocols. The assessment comprises multiple-choice questions that
require both recall of facts and application of concepts to complex diving situations, ensuring readiness
for professional-level diving activities.
SECTION ONE: QUESTIONS 1-100
1. According to Boyle's Law, if a diver descends from the surface to 33 feet (2 ata) in seawater, the
volume of a gas-filled flexible container will:
A. Increase to twice its original volume
B. Decrease to half its original volume
C. Remain the same
D. Decrease to one-quarter of its original volume
🟢 B. Decrease to half its original volume
🔴 Explanation: Boyle's Law states that at a constant temperature, the volume of a gas is inversely
proportional to the absolute pressure. At 33 feet (2 ata), the pressure is double that at the surface (1
ata), so the volume is halved.
2. Which of the following best describes the primary function of the second stage of a scuba
regulator?
A. To reduce the high-pressure air from the cylinder to an intermediate pressure
B. To deliver air to the diver on demand at ambient pressure
,C. To provide a direct connection for a pressure gauge
D. To filter and dry the air before inhalation
🟢 B. To deliver air to the diver on demand at ambient pressure
🔴 Explanation: The second stage is the demand valve that senses the diver's inhalation and delivers
air at the surrounding ambient pressure, making breathing possible underwater.
3. A diver is planning a dive to 80 feet for 25 minutes using the NAUI Dive Tables. What is the
minimum surface interval required if they want to make a second dive to 60 feet for 30 minutes?
A. 0:45
B. 1:00
C. 1:30
D. 2:00
🟢 C. 1:30
🔴 Explanation: Using the NAUI tables, after the first dive, the diver would be in a specific pressure
group. To make the second dive safely, a sufficient surface interval is needed to off-gas. The required
interval is calculated from the repetitive dive tables, leading to a minimum of 1 hour and 30 minutes in
this scenario.
4. A diver experiencing a sudden, sharp pain in a joint, accompanied by a red rash and fatigue, is
most likely suffering from:
A. Nitrogen narcosis
B. Oxygen toxicity
C. Decompression sickness
D. An air embolism
🟢 C. Decompression sickness
🔴 Explanation: Joint pain, rash (cutis marmorata), and fatigue are classic symptoms of decompression
sickness (DCS), caused by nitrogen bubbles forming in tissues and blood due to rapid or excessive
decompression.
5. What is the most critical step to take if a diver shows signs of an arterial gas embolism (AGE)?
A. Administer 100% oxygen
B. Have the diver exercise to promote circulation
C. Place the diver in a head-down position
D. Transport the diver to a hyperbaric facility for recompression
🟢 A. Administer 100% oxygen
🔴 Explanation: Immediate high-flow oxygen is the first-line emergency treatment for an AGE to
support tissue oxygenation and reduce bubble size. While recompression is the definitive treatment,
oxygen must be administered without delay.
, 6. The partial pressure of oxygen (PO2) at a depth of 99 feet (4 ata) in air is approximately:
A. 0.42 atm
B. 0.84 atm
C. 1.6 atm
D. 2.0 atm
🟢 B. 0.84 atm
🔴 Explanation: The fraction of oxygen in air is 21% (0.21). At 4 ata, the PO2 is 4 ata x 0.21 = 0.84 atm.
This is a safe and calculable figure, highlighting the increase in partial pressure with depth.
7. Which of the following is a sign of an impending oxygen toxicity seizure in a diver?
A. A metallic taste in the mouth
B. Uncontrollable laughter
C. Blurred vision
D. Sharp, shooting pains in the limbs
🟢 A. A metallic taste in the mouth
🔴 Explanation: A metallic taste, along with visual or auditory disturbances (tunnel vision, ringing in
ears), nausea, and twitching, are prodromal symptoms of central nervous system oxygen toxicity.
8. The NAUI Standard Safe Diving Practices Statement emphasizes that a diver must:
A. Always dive with a buddy
B. Only dive in clear, warm water
C. Avoid diving deeper than 60 feet
D. Use a dive computer on every dive
🟢 A. Always dive with a buddy
🔴 Explanation: The buddy system is a cornerstone of NAUI's safety philosophy, providing a
redundant source of air, assistance, and emergency support.
9. A dive knife should ideally be mounted where for quick, one-handed access?
A. On the back of the cylinder
B. On the inside of the leg
C. On the weight belt
D. On the outside of the calf or lower leg
🟢 D. On the outside of the calf or lower leg
🔴 Explanation: The outside of the calf is a standard location that allows for access with either hand
without creating a snag hazard or interfering with leg movement.
10. A diver who ascends too quickly from a dive may experience decompression sickness because:
