Divemaster Final Exam B 2025/2026 | Complete Exam with Verified Questions and 100% Correct Answers

Divemaster Final Exam B 2025/2026 |
Complete Exam with Verified Questions and
100% Correct Answers




Divemaster Practice Exam
Question 1: What is the primary factor affecting pressure changes underwater?
A) Temperature
B) Depth
C) Current
D) Salinity
B) Depth
Rationale: Pressure increases by ~1 atmosphere for every 10 m / 33 ft of seawater depth.



Question 2: According to Boyle’s Law, what happens to air volume as pressure increases?
A) Increases
B) Decreases
C) Remains constant
D) Doubles
B) Decreases
Rationale: Boyle’s Law states that at a constant temperature, pressure and volume are inversely
proportional.



Question 3: What causes nitrogen narcosis?
A) Oxygen toxicity
B) Accumulation of carbon dioxide
C) Increased partial pressure of nitrogen
D) Rapid ascent
C) Increased partial pressure of nitrogen
Rationale: At depth, elevated nitrogen partial pressures affect the nervous system, causing
narcosis.

,Question 4: At what depth does seawater pressure reach 4 atmospheres absolute (ATA)?
A) 10 m / 33 ft
B) 20 m / 66 ft
C) 30 m / 99 ft
D) 40 m / 132 ft
C) 30 m / 99 ft
Rationale: 1 ATA at surface + 3 ATA from 30 m depth = 4 ATA total.



Question 5: What is the most effective method to reduce the risk of decompression sickness?
A) Diving deeper than 30 m
B) Limiting bottom time and ascending slowly
C) Holding your breath on ascent
D) Using smaller tanks
B) Limiting bottom time and ascending slowly
Rationale: Slow ascent and controlled bottom time minimize nitrogen supersaturation.



Question 6: What gas is primarily responsible for decompression sickness?
A) Oxygen
B) Helium
C) Nitrogen
D) Carbon dioxide
C) Nitrogen
Rationale: Excess nitrogen absorbed under pressure forms bubbles if ascent is too rapid.



Question 7: Which of the following increases the risk of oxygen toxicity?
A) Shallow dives
B) Low partial pressure of oxygen
C) Exceeding 1.4 ATA of PO₂
D) Breathing air at the surface
C) Exceeding 1.4 ATA of PO₂
Rationale: Central nervous system oxygen toxicity risk rises above 1.4 ATA PO₂.



Question 8: What is the primary role of a Divemaster during guided dives?
A) Take underwater photographs
B) Provide dive instruction
C) Supervise, lead, and ensure diver safety

, D) Conduct equipment repairs underwater
C) Supervise, lead, and ensure diver safety
Rationale: A Divemaster’s core responsibility is diver supervision and safety management.



Question 9: When planning a multilevel dive, which tool provides the most accurate limits?
A) Dive tables
B) Dive computers
C) Wrist compass
D) Pressure gauge
B) Dive computers
Rationale: Computers calculate nitrogen loading in real time, allowing multilevel diving.



Question 10: What happens if a diver holds their breath while ascending?
A) Oxygen toxicity
B) Barotrauma (lung overexpansion injury)
C) Nitrogen narcosis
D) Decompression sickness
B) Barotrauma (lung overexpansion injury)
Rationale: Expanding air during ascent can rupture lung tissue if not exhaled.



Question 11: What is the recommended maximum ascent rate for recreational diving?
A) 9 m/min (30 ft/min)
B) 18 m/min (60 ft/min)
C) 30 m/min (100 ft/min)
D) As fast as possible
A) 9 m/min (30 ft/min)
Rationale: Slow ascent reduces the risk of decompression sickness and barotrauma.



Question 12: Which of the following is a sign of carbon monoxide poisoning from contaminated
air?
A) Euphoria
B) Cherry-red lips/skin and headache
C) Tingling in extremities
D) Narcosis-like confusion
B) Cherry-red lips/skin and headache
Rationale: CO binds to hemoglobin, reducing oxygen transport and causing hypoxia symptoms.