BSAC SPORTS DIVER
EXAM
Q1: What is the primary cause of decompression sickness (DCS)?
A. Too much oxygen in the body
B. Rapid ascent causing nitrogen bubbles in the body
C. Hypothermia
D. Equipment failure
✅ Answer: B
Explanation: Decompression sickness occurs when dissolved nitrogen forms bubbles
in the body due to a rapid decrease in pressure during ascent.
Q2: Which gas law explains the absorption of nitrogen into body tissues under
pressure?
A. Boyle’s Law
B. Dalton’s Law
C. Henry’s Law
D. Charles’ Law
✅ Answer: C
Explanation: Henry’s Law states that gas dissolves into a liquid in proportion to the
pressure of the gas.
Section 2: Dive Planning and Tables
Q3: If your first dive is 30m for 20 minutes and you want to do a second dive to 18m,
how long must you wait before the second dive to avoid mandatory decompression?
A. No wait time needed
,B. At least 6 hours
C. Minimum surface interval as per the BSAC tables
D. Wait until the next day
✅ Answer: C
Explanation: You must consult BSAC tables for surface interval and no-
decompression time planning.
Q4: What is the recommended maximum partial pressure of oxygen (PO₂) for BSAC
Sports Divers using nitrox?
A. 0.16 bar
B. 1.4 bar
C. 1.6 bar
D. 2.0 bar
✅ Answer: B
Explanation: 1.4 bar is the maximum PO₂ typically recommended for the working
portion of a dive.
Section 3: Equipment and Procedures
Q5: What is the primary use of a DSMB (Delayed Surface Marker Buoy)?
A. It marks a dive site permanently
B. It helps the diver ascend faster
C. It signals your position to the surface while you're still underwater
D. It prevents entanglement
✅ Answer: C
Explanation: DSMBs are used to show surface support where a diver is ascending or
conducting a safety stop.
Q6: What is the function of a first stage regulator?
A. To convert high pressure air to ambient pressure
B. To convert tank pressure to intermediate pressure
C. To measure tank pressure
D. To remove water from the tank
, ✅ Answer: B
Explanation: The first stage reduces high pressure air in the tank to intermediate
pressure for delivery to the second stage.
Section 4: Rescue and Emergency Procedures
Q7: If your buddy becomes unresponsive underwater, what should be your first
action?
A. Ascend alone and get help
B. Check they are breathing
C. Signal for help
D. Secure their airway, inflate their BCD, and begin controlled ascent
✅ Answer: D
Explanation: Immediate buoyancy and controlled ascent are essential to getting
them to the surface for rescue.
Q8: Which of the following symptoms is associated with carbon monoxide poisoning
in diving?
A. Muscle cramps
B. Tingling fingers
C. Cherry red lips and confusion
D. Ear barotrauma
✅ Answer: C
Explanation: Carbon monoxide binds with hemoglobin, causing oxygen starvation
and distinctive symptoms.
Section 5: Dive Environment & Hazards
Q9: What is the best way to avoid a down-current when diving near a wall?
A. Stay away from the wall
B. Stay close to the wall and monitor depth
C. Dive with a heavier weight
D. Use a compass constantly
✅ Answer: B
EXAM
Q1: What is the primary cause of decompression sickness (DCS)?
A. Too much oxygen in the body
B. Rapid ascent causing nitrogen bubbles in the body
C. Hypothermia
D. Equipment failure
✅ Answer: B
Explanation: Decompression sickness occurs when dissolved nitrogen forms bubbles
in the body due to a rapid decrease in pressure during ascent.
Q2: Which gas law explains the absorption of nitrogen into body tissues under
pressure?
A. Boyle’s Law
B. Dalton’s Law
C. Henry’s Law
D. Charles’ Law
✅ Answer: C
Explanation: Henry’s Law states that gas dissolves into a liquid in proportion to the
pressure of the gas.
Section 2: Dive Planning and Tables
Q3: If your first dive is 30m for 20 minutes and you want to do a second dive to 18m,
how long must you wait before the second dive to avoid mandatory decompression?
A. No wait time needed
,B. At least 6 hours
C. Minimum surface interval as per the BSAC tables
D. Wait until the next day
✅ Answer: C
Explanation: You must consult BSAC tables for surface interval and no-
decompression time planning.
Q4: What is the recommended maximum partial pressure of oxygen (PO₂) for BSAC
Sports Divers using nitrox?
A. 0.16 bar
B. 1.4 bar
C. 1.6 bar
D. 2.0 bar
✅ Answer: B
Explanation: 1.4 bar is the maximum PO₂ typically recommended for the working
portion of a dive.
Section 3: Equipment and Procedures
Q5: What is the primary use of a DSMB (Delayed Surface Marker Buoy)?
A. It marks a dive site permanently
B. It helps the diver ascend faster
C. It signals your position to the surface while you're still underwater
D. It prevents entanglement
✅ Answer: C
Explanation: DSMBs are used to show surface support where a diver is ascending or
conducting a safety stop.
Q6: What is the function of a first stage regulator?
A. To convert high pressure air to ambient pressure
B. To convert tank pressure to intermediate pressure
C. To measure tank pressure
D. To remove water from the tank
, ✅ Answer: B
Explanation: The first stage reduces high pressure air in the tank to intermediate
pressure for delivery to the second stage.
Section 4: Rescue and Emergency Procedures
Q7: If your buddy becomes unresponsive underwater, what should be your first
action?
A. Ascend alone and get help
B. Check they are breathing
C. Signal for help
D. Secure their airway, inflate their BCD, and begin controlled ascent
✅ Answer: D
Explanation: Immediate buoyancy and controlled ascent are essential to getting
them to the surface for rescue.
Q8: Which of the following symptoms is associated with carbon monoxide poisoning
in diving?
A. Muscle cramps
B. Tingling fingers
C. Cherry red lips and confusion
D. Ear barotrauma
✅ Answer: C
Explanation: Carbon monoxide binds with hemoglobin, causing oxygen starvation
and distinctive symptoms.
Section 5: Dive Environment & Hazards
Q9: What is the best way to avoid a down-current when diving near a wall?
A. Stay away from the wall
B. Stay close to the wall and monitor depth
C. Dive with a heavier weight
D. Use a compass constantly
✅ Answer: B
