BSAC SPORTS DIVER THEORY QUESTIONS & ANSWERS WITH GUARANTEED PASS!! 2026/2027 2026/2027 | Page 1 | Passing Score: 75%
BSAC
BSAC SPORTS DIVER THEORY QUESTIONS &
ANSWERS WITH GUARANTEED PASS!!
2026/2027
SPORTS DIVER THEORY . Official Exam 2026/2027
100 75% CERTIFIED
QUESTIONS PASSING SCORE CERTIFIED
TABLE OF CONTENTS
Section 1 Diving Physics & Physiology Q1-Q20
Section 2 Decompression Theory & Dive Planning Q21-Q40
Section 3 Equipment & Gas Management Q41-Q60
Section 4 Dive Environment & Navigation Q61-Q80
Section 5 Rescue Skills & Emergency Procedures Q81-Q100
Instructions: Select the single best answer for each question. This exam is designed for BSAC Sports Diver Theory
certification preparation. Passing score: 75% (75 questions correct).
BSAC SPORTS DIVER THEORY QUESTIONS & ANSWERS WITH GUARANTEED PASS!! 2026/2027 - 2026/2027 | Passing Score: 75% | Page 1 of 52
, SECTION 1 | Diving Physics & Physiology | Q1-Q20 | BSAC SPORTS DIVER THEORY QUESTIONS & ANSWERS
WITH GUARANTEED PASS!! 2026/2027 2026/2027
Q1 Question 1 of 100
A 34-year-old diver descends to 18 m in seawater and experiences discomfort in both ears.
The diver attempts to equalise but one ear remains blocked despite repeated Valsalva
manoeuvres. What is the most likely physiological explanation for the persistent discomfort?
A. The tympanic membrane has already ruptured allowing water to enter the middle ear
B. The Eustachian tube on the affected side is blocked preventing air from reaching the
middle ear
C. The external auditory canal is occluded by cerumen reducing pressure transmission
D. The round window has ruptured causing perilymph leakage into the middle ear
Correct Answer: B
Rationale:
The Eustachian tube connects the middle ear to the nasopharynx and must open to allow equalisation; if it
remains blocked, pressure cannot equalise and discomfort persists. A ruptured tympanic membrane would
relieve pain rather than cause persistent discomfort, and round window rupture is a barotrauma consequence
not an initial cause.
Q2 Question 2 of 100
A 28-year-old diver breathes compressed air at 30 m depth. Using Dalton's Law and
assuming 1 bar surface atmospheric pressure, what is the approximate partial pressure of
oxygen the diver is breathing?
A. 0.21 bar
B. 0.63 bar
C. 0.84 bar
D. 1.26 bar
Correct Answer: C
Rationale:
At 30 m the absolute pressure is 4 bar. Using Dalton's Law, the partial pressure of oxygen is 0.21 x 4 = 0.84 bar.
0.21 bar is the surface PO2, and 0.63 bar would correspond to a depth of only 10 m.
BSAC SPORTS DIVER THEORY QUESTIONS & ANSWERS WITH GUARANTEED PASS!! 2026/2027 - 2026/2027 | Passing Score: 75% | Page 2 of 52
, Q3 Question 3 of 100
A 42-year-old diver surfaces after a 25-minute dive to 22 m and notices tingling in the right
shoulder and upper arm within 10 minutes. The diver breathed compressed air throughout
the dive. Which gas law best explains the formation of bubbles causing these symptoms?
A. Boyle's Law
B. Charles's Law
C. Henry's Law
D. Gay-Lussac's Law
Correct Answer: C
Rationale:
Henry's Law states that the amount of gas dissolved in a liquid is proportional to the partial pressure of that gas
above the liquid. During ascent, reduced ambient pressure decreases gas solubility, releasing dissolved nitrogen
as bubbles. Boyle's Law describes gas volume changes but not dissolution, and Charles's Law relates
temperature and volume.
Q4 Question 4 of 100
A 30-year-old diver makes a rapid ascent from 15 m while holding his breath. Upon reaching
the surface he complains of severe chest pain and breathes with difficulty. Examination
reveals subcutaneous emphysema at the base of the neck. Which condition has most likely
occurred?
A. Arterial gas embolism
B. Pulmonary barotrauma with mediastinal emphysema
C. Decompression sickness Type I
D. Nitrogen narcosis with secondary effects
Correct Answer: B
Rationale:
A breath-hold ascent from even shallow depth causes lung over-expansion because the expanding air cannot
escape. Subcutaneous emphysema at the neck is a classic sign of mediastinal emphysema from pulmonary
barotrauma. Arterial gas embolism would present with neurological symptoms, and decompression sickness
does not cause subcutaneous emphysema.
BSAC SPORTS DIVER THEORY QUESTIONS & ANSWERS WITH GUARANTEED PASS!! 2026/2027 - 2026/2027 | Passing Score: 75% | Page 3 of 52
, Q5 Question 5 of 100
A 36-year-old diver is breathing nitrox 32 at a depth of 25 m. What is the maximum operating
depth for this gas mixture based on an oxygen partial pressure limit of 1.4 bar?
A. 37 m
B. 33 m
C. 40 m
D. 29 m
Correct Answer: B
Rationale:
The MOD is calculated as (1..32 - 1) x 10 = 33.75 m, rounded down to 33 m for safety. At 37 m the PO2
would be 0.32 x 4.7 = 1.504 bar which exceeds the limit. 29 m would be conservative but not the maximum.
Q6 Question 6 of 100
A 25-year-old diver sits on a boat in hot weather for 45 minutes before descending. The
diver is well hydrated and in good health. Which physiological change most directly
increases the risk of decompression sickness during the subsequent dive?
A. Decreased cardiac output reducing nitrogen elimination
B. Increased peripheral vasodilation raising tissue nitrogen uptake
C. Elevated core body temperature decreasing gas solubility
D. Increased respiratory rate lowering arterial nitrogen partial pressure
Correct Answer: B
Rationale:
Heat-induced peripheral vasodilation increases blood flow to tissues, accelerating nitrogen uptake during the
dive. While elevated temperature does slightly reduce gas solubility, the dominant effect is increased perfusion.
Decreased cardiac output is not typical in heat exposure at rest, and increased respiratory rate would not lower
nitrogen partial pressure when breathing compressed air at depth.
BSAC SPORTS DIVER THEORY QUESTIONS & ANSWERS WITH GUARANTEED PASS!! 2026/2027 - 2026/2027 | Passing Score: 75% | Page 4 of 52
BSAC
BSAC SPORTS DIVER THEORY QUESTIONS &
ANSWERS WITH GUARANTEED PASS!!
2026/2027
SPORTS DIVER THEORY . Official Exam 2026/2027
100 75% CERTIFIED
QUESTIONS PASSING SCORE CERTIFIED
TABLE OF CONTENTS
Section 1 Diving Physics & Physiology Q1-Q20
Section 2 Decompression Theory & Dive Planning Q21-Q40
Section 3 Equipment & Gas Management Q41-Q60
Section 4 Dive Environment & Navigation Q61-Q80
Section 5 Rescue Skills & Emergency Procedures Q81-Q100
Instructions: Select the single best answer for each question. This exam is designed for BSAC Sports Diver Theory
certification preparation. Passing score: 75% (75 questions correct).
BSAC SPORTS DIVER THEORY QUESTIONS & ANSWERS WITH GUARANTEED PASS!! 2026/2027 - 2026/2027 | Passing Score: 75% | Page 1 of 52
, SECTION 1 | Diving Physics & Physiology | Q1-Q20 | BSAC SPORTS DIVER THEORY QUESTIONS & ANSWERS
WITH GUARANTEED PASS!! 2026/2027 2026/2027
Q1 Question 1 of 100
A 34-year-old diver descends to 18 m in seawater and experiences discomfort in both ears.
The diver attempts to equalise but one ear remains blocked despite repeated Valsalva
manoeuvres. What is the most likely physiological explanation for the persistent discomfort?
A. The tympanic membrane has already ruptured allowing water to enter the middle ear
B. The Eustachian tube on the affected side is blocked preventing air from reaching the
middle ear
C. The external auditory canal is occluded by cerumen reducing pressure transmission
D. The round window has ruptured causing perilymph leakage into the middle ear
Correct Answer: B
Rationale:
The Eustachian tube connects the middle ear to the nasopharynx and must open to allow equalisation; if it
remains blocked, pressure cannot equalise and discomfort persists. A ruptured tympanic membrane would
relieve pain rather than cause persistent discomfort, and round window rupture is a barotrauma consequence
not an initial cause.
Q2 Question 2 of 100
A 28-year-old diver breathes compressed air at 30 m depth. Using Dalton's Law and
assuming 1 bar surface atmospheric pressure, what is the approximate partial pressure of
oxygen the diver is breathing?
A. 0.21 bar
B. 0.63 bar
C. 0.84 bar
D. 1.26 bar
Correct Answer: C
Rationale:
At 30 m the absolute pressure is 4 bar. Using Dalton's Law, the partial pressure of oxygen is 0.21 x 4 = 0.84 bar.
0.21 bar is the surface PO2, and 0.63 bar would correspond to a depth of only 10 m.
BSAC SPORTS DIVER THEORY QUESTIONS & ANSWERS WITH GUARANTEED PASS!! 2026/2027 - 2026/2027 | Passing Score: 75% | Page 2 of 52
, Q3 Question 3 of 100
A 42-year-old diver surfaces after a 25-minute dive to 22 m and notices tingling in the right
shoulder and upper arm within 10 minutes. The diver breathed compressed air throughout
the dive. Which gas law best explains the formation of bubbles causing these symptoms?
A. Boyle's Law
B. Charles's Law
C. Henry's Law
D. Gay-Lussac's Law
Correct Answer: C
Rationale:
Henry's Law states that the amount of gas dissolved in a liquid is proportional to the partial pressure of that gas
above the liquid. During ascent, reduced ambient pressure decreases gas solubility, releasing dissolved nitrogen
as bubbles. Boyle's Law describes gas volume changes but not dissolution, and Charles's Law relates
temperature and volume.
Q4 Question 4 of 100
A 30-year-old diver makes a rapid ascent from 15 m while holding his breath. Upon reaching
the surface he complains of severe chest pain and breathes with difficulty. Examination
reveals subcutaneous emphysema at the base of the neck. Which condition has most likely
occurred?
A. Arterial gas embolism
B. Pulmonary barotrauma with mediastinal emphysema
C. Decompression sickness Type I
D. Nitrogen narcosis with secondary effects
Correct Answer: B
Rationale:
A breath-hold ascent from even shallow depth causes lung over-expansion because the expanding air cannot
escape. Subcutaneous emphysema at the neck is a classic sign of mediastinal emphysema from pulmonary
barotrauma. Arterial gas embolism would present with neurological symptoms, and decompression sickness
does not cause subcutaneous emphysema.
BSAC SPORTS DIVER THEORY QUESTIONS & ANSWERS WITH GUARANTEED PASS!! 2026/2027 - 2026/2027 | Passing Score: 75% | Page 3 of 52
, Q5 Question 5 of 100
A 36-year-old diver is breathing nitrox 32 at a depth of 25 m. What is the maximum operating
depth for this gas mixture based on an oxygen partial pressure limit of 1.4 bar?
A. 37 m
B. 33 m
C. 40 m
D. 29 m
Correct Answer: B
Rationale:
The MOD is calculated as (1..32 - 1) x 10 = 33.75 m, rounded down to 33 m for safety. At 37 m the PO2
would be 0.32 x 4.7 = 1.504 bar which exceeds the limit. 29 m would be conservative but not the maximum.
Q6 Question 6 of 100
A 25-year-old diver sits on a boat in hot weather for 45 minutes before descending. The
diver is well hydrated and in good health. Which physiological change most directly
increases the risk of decompression sickness during the subsequent dive?
A. Decreased cardiac output reducing nitrogen elimination
B. Increased peripheral vasodilation raising tissue nitrogen uptake
C. Elevated core body temperature decreasing gas solubility
D. Increased respiratory rate lowering arterial nitrogen partial pressure
Correct Answer: B
Rationale:
Heat-induced peripheral vasodilation increases blood flow to tissues, accelerating nitrogen uptake during the
dive. While elevated temperature does slightly reduce gas solubility, the dominant effect is increased perfusion.
Decreased cardiac output is not typical in heat exposure at rest, and increased respiratory rate would not lower
nitrogen partial pressure when breathing compressed air at depth.
BSAC SPORTS DIVER THEORY QUESTIONS & ANSWERS WITH GUARANTEED PASS!! 2026/2027 - 2026/2027 | Passing Score: 75% | Page 4 of 52
