PADI Open Water Diver Final
Assessment Exam 2026/2027 | Actual
Questions & Verified Correct Answers |
Master Your Scuba Certification Theory
Guide (100% Pass Rate Resource)
What is the primary reason a diver should never hold their breath while ascending?
A. It increases nitrogen absorption
B. It can cause expanding air in the lungs to overexpand them
C. It reduces buoyancy
D. It causes the regulator to free-flow
Answer: B. It can cause expanding air in the lungs to overexpand them.
Rationale: As a diver ascends, surrounding pressure decreases and the air in the
lungs expands. Holding the breath can prevent that expanding air from escaping
normally and may cause serious lung overexpansion injuries.
Which piece of equipment allows a diver to control buoyancy by adding or
releasing air?
A. Dive computer
B. BCD
C. Surface marker buoy
D. Weight belt
Answer: B. BCD.
Rationale: The buoyancy control device (BCD) is designed to help the diver
adjust buoyancy by adding or venting gas. Proper buoyancy control improves
comfort, safety, and air consumption.
,What should a diver do if their buddy suddenly runs out of breathing gas?
A. Immediately swim to the surface alone
B. Share an appropriate alternate air source and begin a controlled ascent
C. Remove the buddy’s regulator
D. Inflate the buddy’s BCD completely
Answer: B. Share an appropriate alternate air source and begin a controlled
ascent.
Rationale: Out-of-air emergencies are handled through established buddy
procedures. The diver should provide an appropriate alternate air source,
establish control and communication, and make a controlled ascent according to
training.
What happens to the pressure of a gas as a diver descends?
A. It decreases
B. It remains constant
C. It increases
D. It becomes zero
Answer: C. It increases.
Rationale: Water pressure increases with depth. Increasing pressure affects the
air spaces in the diver’s body and equipment, which is why equalization and
proper buoyancy procedures are essential.
When should a diver equalize their ears during descent?
A. Only after experiencing pain
B. Early and frequently before discomfort develops
C. Only at the maximum depth
D. During ascent only
Answer: B. Early and frequently before discomfort develops.
,Rationale: Equalizing early and often helps prevent pressure-related ear
discomfort and injury. A diver should never force an equalization or continue
descending when unable to equalize.
Which gas law explains why air spaces become smaller as pressure increases
during descent?
A. Boyle’s law
B. Newton’s law
C. Ohm’s law
D. Hooke’s law
Answer: A. Boyle’s law.
Rationale: Boyle’s law describes the inverse relationship between pressure and
volume for a gas at constant temperature. As ambient pressure increases, the
volume of a gas-filled space decreases.
What is an important purpose of a dive computer?
A. To replace all dive planning
B. To monitor depth and calculate dive-related information
C. To increase the diver’s air supply
D. To prevent all decompression illness
Answer: B. To monitor depth and calculate dive-related information.
Rationale: Dive computers provide information such as depth, dive time, ascent
information, and no-stop limits depending on the model. They are an aid to dive
planning and monitoring, not a guarantee against decompression illness.
A diver notices that their mask is slowly filling with water. What should they do?
A. Panic and immediately remove the mask
B. Use the appropriate mask-clearing procedure
C. Remove their regulator
D. Swim rapidly toward the surface
, Answer: B. Use the appropriate mask-clearing procedure.
Rationale: Mask flooding is a common skill taught during entry-level training.
Controlled breathing through the regulator and the proper mask-clearing
technique allow the diver to clear the water while remaining calm and in control.
Why is a slow, controlled ascent important?
A. It eliminates the need for dive planning
B. It helps manage pressure changes and reduces decompression-related risk
C. It increases nitrogen absorption
D. It prevents the need for equalization
Answer: B. It helps manage pressure changes and reduces decompression-
related risk.
Rationale: During ascent, pressure decreases and dissolved gases can come out
of solution. Following appropriate ascent procedures helps reduce the risk
associated with excessive ascent rates and pressure changes.
What is the best response if a diver becomes separated from their buddy?
A. Continue the dive indefinitely
B. Follow the agreed buddy-separation procedure
C. Descend to maximum depth to search
D. Swim away from the planned area
Answer: B. Follow the agreed buddy-separation procedure.
Rationale: Divers should establish a separation procedure before entering the
water. Typically, this involves a controlled search according to training and then
ending the dive if the buddy cannot be located within the planned procedure.
Why should divers avoid excessive physical exertion underwater?
A. It always increases nitrogen elimination
B. It can increase breathing-gas consumption and fatigue
Assessment Exam 2026/2027 | Actual
Questions & Verified Correct Answers |
Master Your Scuba Certification Theory
Guide (100% Pass Rate Resource)
What is the primary reason a diver should never hold their breath while ascending?
A. It increases nitrogen absorption
B. It can cause expanding air in the lungs to overexpand them
C. It reduces buoyancy
D. It causes the regulator to free-flow
Answer: B. It can cause expanding air in the lungs to overexpand them.
Rationale: As a diver ascends, surrounding pressure decreases and the air in the
lungs expands. Holding the breath can prevent that expanding air from escaping
normally and may cause serious lung overexpansion injuries.
Which piece of equipment allows a diver to control buoyancy by adding or
releasing air?
A. Dive computer
B. BCD
C. Surface marker buoy
D. Weight belt
Answer: B. BCD.
Rationale: The buoyancy control device (BCD) is designed to help the diver
adjust buoyancy by adding or venting gas. Proper buoyancy control improves
comfort, safety, and air consumption.
,What should a diver do if their buddy suddenly runs out of breathing gas?
A. Immediately swim to the surface alone
B. Share an appropriate alternate air source and begin a controlled ascent
C. Remove the buddy’s regulator
D. Inflate the buddy’s BCD completely
Answer: B. Share an appropriate alternate air source and begin a controlled
ascent.
Rationale: Out-of-air emergencies are handled through established buddy
procedures. The diver should provide an appropriate alternate air source,
establish control and communication, and make a controlled ascent according to
training.
What happens to the pressure of a gas as a diver descends?
A. It decreases
B. It remains constant
C. It increases
D. It becomes zero
Answer: C. It increases.
Rationale: Water pressure increases with depth. Increasing pressure affects the
air spaces in the diver’s body and equipment, which is why equalization and
proper buoyancy procedures are essential.
When should a diver equalize their ears during descent?
A. Only after experiencing pain
B. Early and frequently before discomfort develops
C. Only at the maximum depth
D. During ascent only
Answer: B. Early and frequently before discomfort develops.
,Rationale: Equalizing early and often helps prevent pressure-related ear
discomfort and injury. A diver should never force an equalization or continue
descending when unable to equalize.
Which gas law explains why air spaces become smaller as pressure increases
during descent?
A. Boyle’s law
B. Newton’s law
C. Ohm’s law
D. Hooke’s law
Answer: A. Boyle’s law.
Rationale: Boyle’s law describes the inverse relationship between pressure and
volume for a gas at constant temperature. As ambient pressure increases, the
volume of a gas-filled space decreases.
What is an important purpose of a dive computer?
A. To replace all dive planning
B. To monitor depth and calculate dive-related information
C. To increase the diver’s air supply
D. To prevent all decompression illness
Answer: B. To monitor depth and calculate dive-related information.
Rationale: Dive computers provide information such as depth, dive time, ascent
information, and no-stop limits depending on the model. They are an aid to dive
planning and monitoring, not a guarantee against decompression illness.
A diver notices that their mask is slowly filling with water. What should they do?
A. Panic and immediately remove the mask
B. Use the appropriate mask-clearing procedure
C. Remove their regulator
D. Swim rapidly toward the surface
, Answer: B. Use the appropriate mask-clearing procedure.
Rationale: Mask flooding is a common skill taught during entry-level training.
Controlled breathing through the regulator and the proper mask-clearing
technique allow the diver to clear the water while remaining calm and in control.
Why is a slow, controlled ascent important?
A. It eliminates the need for dive planning
B. It helps manage pressure changes and reduces decompression-related risk
C. It increases nitrogen absorption
D. It prevents the need for equalization
Answer: B. It helps manage pressure changes and reduces decompression-
related risk.
Rationale: During ascent, pressure decreases and dissolved gases can come out
of solution. Following appropriate ascent procedures helps reduce the risk
associated with excessive ascent rates and pressure changes.
What is the best response if a diver becomes separated from their buddy?
A. Continue the dive indefinitely
B. Follow the agreed buddy-separation procedure
C. Descend to maximum depth to search
D. Swim away from the planned area
Answer: B. Follow the agreed buddy-separation procedure.
Rationale: Divers should establish a separation procedure before entering the
water. Typically, this involves a controlled search according to training and then
ending the dive if the buddy cannot be located within the planned procedure.
Why should divers avoid excessive physical exertion underwater?
A. It always increases nitrogen elimination
B. It can increase breathing-gas consumption and fatigue
