SSI ITC FINAL EXAM
COMPREHENSIVE PRACTICE (2026/2027 EDITION)
250 Multiple-Choice Questions - Complete Practice Exam
Independent-Study Disclaimer
This practice examination is an independent study aid and is not affiliated with, endorsed by, or sponsored by
Scuba Schools International (SSI) or any other organization. It is provided for educational and self-assessment
purposes only and is not a substitute for official SSI training, the SSI Training Standards, or professional
guidance. Content is subject to change; always consult current SSI materials.
, Section 1: Dive Theory – Physics, Physiology, Decompression, and
Tables/Computers (45 questions)
Q1: Which of the following gas laws states that the volume of a gas is inversely proportional to its pressure (at
constant temperature)?
A. Charles's Law
B. Dalton's Law
C. Henry's Law
D. Boyle's Law [CORRECT]
Correct Answer: D
Rationale: Boyle's Law states that gas volume is inversely proportional to pressure at constant temperature.
The others are different gas laws.
Q2: Which of the following gas laws states that the amount of gas dissolved in a liquid is proportional to its partial
pressure?
A. Henry's Law [CORRECT]
B. Boyle's Law
C. Charles's Law
D. Dalton's Law
Correct Answer: A
Rationale: Henry's Law describes gas dissolution in a liquid proportional to partial pressure. The others are
different.
Q3: Which of the following gas laws states that the total pressure of a gas mixture equals the sum of the partial
pressures of its components?
A. Boyle's Law
B. Charles's Law
C. Dalton's Law [CORRECT]
D. Henry's Law
Correct Answer: C
Rationale: Dalton's Law states total pressure equals the sum of partial pressures. The others are different.
Q4: Which of the following gas laws states that gas volume increases with temperature at constant pressure?
A. Boyle's Law
B. Charles's Law [CORRECT]
C. Dalton's Law
D. Henry's Law
Correct Answer: B
Rationale: Charles's Law states volume increases with temperature at constant pressure. The others are
different.
SSI ITC Final Exam - 2026/2027 Edition Page 2
, Q5: As a diver descends, the pressure on the body:
A. Decreases
B. Increases [CORRECT]
C. Stays the same
D. Is irrelevant
Correct Answer: B
Rationale: Pressure increases with depth. The others are incorrect.
Q6: At 10 meters (33 feet) of seawater, the absolute pressure is approximately:
A. 1 bar
B. 2 bar [CORRECT]
C. 3 bar
D. 4 bar
Correct Answer: B
Rationale: At 10 msw, the absolute pressure is about 2 bar (1 atmosphere plus 1 bar of water). The others
are incorrect.
Q7: Which of the following is TRUE about buoyancy?
A. Buoyancy is fixed
B. The BCD does not affect buoyancy
C. A diver's buoyancy is controlled by the BCD and lung volume [CORRECT]
D. Lungs do not affect buoyancy
Correct Answer: C
Rationale: Buoyancy is controlled by the BCD and lung volume. The others are incorrect.
Q8: Which of the following is TRUE about neutral buoyancy?
A. It is sinking
B. It is floating
C. It is optional
D. It is when the diver neither sinks nor floats [CORRECT]
Correct Answer: D
Rationale: Neutral buoyancy is when the diver neither sinks nor floats. The others are incorrect.
Q9: Which of the following is a physiological effect of increased pressure on gas spaces?
A. Squeezes (e.g., ear, mask) [CORRECT]
B. No effect
C. Improved hearing
D. Reduced volume of the body
Correct Answer: A
Rationale: Increased pressure on gas spaces causes squeezes (ear, mask). The others are incorrect.
SSI ITC Final Exam - 2026/2027 Edition Page 3
, Q10: Which of the following is TRUE about ear equalization?
A. Equalization is optional
B. The diver should equalize early and often during descent [CORRECT]
C. Only ascend to equalize
D. The ears do not need equalizing
Correct Answer: B
Rationale: The diver should equalize early and often during descent. The others are incorrect.
Q11: Which of the following is a symptom of a mask squeeze?
A. Improved vision
B. Bleeding under the eyes [CORRECT]
C. No symptoms
D. Warmth
Correct Answer: B
Rationale: A mask squeeze can cause bleeding under the eyes. The others are incorrect.
Q12: Which of the following is TRUE about nitrogen absorption?
A. Nitrogen is not absorbed
B. Nitrogen absorption is constant
C. More nitrogen dissolves in the body at greater depth [CORRECT]
D. Depth does not affect nitrogen
Correct Answer: C
Rationale: More nitrogen dissolves in the body at greater depth. The others are incorrect.
Q13: Which of the following is TRUE about decompression sickness (DCS)?
A. It is caused by oxygen
B. It is caused by CO2
C. It is not a concern
D. It results from nitrogen coming out of solution during ascent [CORRECT]
Correct Answer: D
Rationale: DCS results from nitrogen coming out of solution during ascent. The others are incorrect.
Q14: Which of the following is a symptom of decompression sickness?
A. Joint pain, numbness, and fatigue [CORRECT]
B. Improved vision
C. No symptoms
D. Warmth
Correct Answer: A
Rationale: DCS symptoms include joint pain, numbness, and fatigue. The others are incorrect.
SSI ITC Final Exam - 2026/2027 Edition Page 4
COMPREHENSIVE PRACTICE (2026/2027 EDITION)
250 Multiple-Choice Questions - Complete Practice Exam
Independent-Study Disclaimer
This practice examination is an independent study aid and is not affiliated with, endorsed by, or sponsored by
Scuba Schools International (SSI) or any other organization. It is provided for educational and self-assessment
purposes only and is not a substitute for official SSI training, the SSI Training Standards, or professional
guidance. Content is subject to change; always consult current SSI materials.
, Section 1: Dive Theory – Physics, Physiology, Decompression, and
Tables/Computers (45 questions)
Q1: Which of the following gas laws states that the volume of a gas is inversely proportional to its pressure (at
constant temperature)?
A. Charles's Law
B. Dalton's Law
C. Henry's Law
D. Boyle's Law [CORRECT]
Correct Answer: D
Rationale: Boyle's Law states that gas volume is inversely proportional to pressure at constant temperature.
The others are different gas laws.
Q2: Which of the following gas laws states that the amount of gas dissolved in a liquid is proportional to its partial
pressure?
A. Henry's Law [CORRECT]
B. Boyle's Law
C. Charles's Law
D. Dalton's Law
Correct Answer: A
Rationale: Henry's Law describes gas dissolution in a liquid proportional to partial pressure. The others are
different.
Q3: Which of the following gas laws states that the total pressure of a gas mixture equals the sum of the partial
pressures of its components?
A. Boyle's Law
B. Charles's Law
C. Dalton's Law [CORRECT]
D. Henry's Law
Correct Answer: C
Rationale: Dalton's Law states total pressure equals the sum of partial pressures. The others are different.
Q4: Which of the following gas laws states that gas volume increases with temperature at constant pressure?
A. Boyle's Law
B. Charles's Law [CORRECT]
C. Dalton's Law
D. Henry's Law
Correct Answer: B
Rationale: Charles's Law states volume increases with temperature at constant pressure. The others are
different.
SSI ITC Final Exam - 2026/2027 Edition Page 2
, Q5: As a diver descends, the pressure on the body:
A. Decreases
B. Increases [CORRECT]
C. Stays the same
D. Is irrelevant
Correct Answer: B
Rationale: Pressure increases with depth. The others are incorrect.
Q6: At 10 meters (33 feet) of seawater, the absolute pressure is approximately:
A. 1 bar
B. 2 bar [CORRECT]
C. 3 bar
D. 4 bar
Correct Answer: B
Rationale: At 10 msw, the absolute pressure is about 2 bar (1 atmosphere plus 1 bar of water). The others
are incorrect.
Q7: Which of the following is TRUE about buoyancy?
A. Buoyancy is fixed
B. The BCD does not affect buoyancy
C. A diver's buoyancy is controlled by the BCD and lung volume [CORRECT]
D. Lungs do not affect buoyancy
Correct Answer: C
Rationale: Buoyancy is controlled by the BCD and lung volume. The others are incorrect.
Q8: Which of the following is TRUE about neutral buoyancy?
A. It is sinking
B. It is floating
C. It is optional
D. It is when the diver neither sinks nor floats [CORRECT]
Correct Answer: D
Rationale: Neutral buoyancy is when the diver neither sinks nor floats. The others are incorrect.
Q9: Which of the following is a physiological effect of increased pressure on gas spaces?
A. Squeezes (e.g., ear, mask) [CORRECT]
B. No effect
C. Improved hearing
D. Reduced volume of the body
Correct Answer: A
Rationale: Increased pressure on gas spaces causes squeezes (ear, mask). The others are incorrect.
SSI ITC Final Exam - 2026/2027 Edition Page 3
, Q10: Which of the following is TRUE about ear equalization?
A. Equalization is optional
B. The diver should equalize early and often during descent [CORRECT]
C. Only ascend to equalize
D. The ears do not need equalizing
Correct Answer: B
Rationale: The diver should equalize early and often during descent. The others are incorrect.
Q11: Which of the following is a symptom of a mask squeeze?
A. Improved vision
B. Bleeding under the eyes [CORRECT]
C. No symptoms
D. Warmth
Correct Answer: B
Rationale: A mask squeeze can cause bleeding under the eyes. The others are incorrect.
Q12: Which of the following is TRUE about nitrogen absorption?
A. Nitrogen is not absorbed
B. Nitrogen absorption is constant
C. More nitrogen dissolves in the body at greater depth [CORRECT]
D. Depth does not affect nitrogen
Correct Answer: C
Rationale: More nitrogen dissolves in the body at greater depth. The others are incorrect.
Q13: Which of the following is TRUE about decompression sickness (DCS)?
A. It is caused by oxygen
B. It is caused by CO2
C. It is not a concern
D. It results from nitrogen coming out of solution during ascent [CORRECT]
Correct Answer: D
Rationale: DCS results from nitrogen coming out of solution during ascent. The others are incorrect.
Q14: Which of the following is a symptom of decompression sickness?
A. Joint pain, numbness, and fatigue [CORRECT]
B. Improved vision
C. No symptoms
D. Warmth
Correct Answer: A
Rationale: DCS symptoms include joint pain, numbness, and fatigue. The others are incorrect.
SSI ITC Final Exam - 2026/2027 Edition Page 4
