PADI ENRICHED AIR DIVER FINAL PAPER 2025/2026
QUESTIONS WITH ANSWERS RATED A+
✔✔3-1 Oxygen partial pressure (choose all that apply) - ✔✔1. is used to measure the
concentration of oxygen a diver is exposed to.
2. expresses the part of a gas pressure exerted by the oxygen in the gas.
3. is usually expressed in "atmospheres," abbreviated "ata" or in bar.
4.will vary at a given depth depending upon the oxygen percent.
✔✔3-2 Exposure to increased oxygen partial pressure can make your allowable dive
time - ✔✔shorter.
✔✔3-3 The maximum and contingency oxygen partial pressure limits are - ✔✔1.4
ata/bar and 1.6 ata/bar
✔✔3-4 The primary hazard of exceeding the oxygen exposure limits is - ✔✔a fatal
accident due to convulsing and drowning.
✔✔3-5 Signs and symptoms that may precede a convulsion due to oxygen toxicity
include (choose all that apply) - ✔✔1. visual disturbances.
2. ear ringing.
3. dizziness.
✔✔3-6 If you experience symptoms of oxygen toxicity, you should ascend immediately
and end the dive. - ✔✔True
✔✔3-7 You use your EANx dive computer to manage oxygen exposure by (choose all
that apply) - ✔✔1.setting its maximum PO2at 1.4.
2.staying well within its oxygen limits and above the maximum depth for the blend you're
using.
3.avoiding heavy exercise and carbon dioxide buildup.
4.maintaining good buoyancy and depth control.
✔✔3-8 If you accidentally exceed the oxygen exposure limits for your computer, you
should (choose all that apply) - ✔✔1.ascend immediately but slowly and end the dive.
2.not dive for 24 hours, or as stipulated by the manufacturer.
✔✔4-1 Who must personally verify the analysis of the oxygen content in an enriched air
cylinder before it is used? - ✔✔The diver who will use the cylinder
✔✔4-2 The first step in analyzing enriched air is to calibrate the oxygen analyzer. -
✔✔True
, ✔✔4-3 The standard of practice for the accuracy of enriched air analysis is plus or
minus - ✔✔1%
✔✔4-4 After analyzing enriched air, you should compare the oxygen percent with -
✔✔the percentage marked on the contents sticker or tag.
✔✔5-1 When diving with an enriched air computer (choose all that apply) - ✔✔1. Stay
well within the computer's no stop and oxygen exposure limits.
2. Make safety stops and follow all the conservative diving practices you've already
learned.
3. Know the blend's maximum depth and rely on the computer warning as a secondary
alert only.
✔✔5-2 You set most enriched air computers by letting the computer automatically
analyze the blend you're using. - ✔✔False
✔✔5-3 If you forget to set your enriched air computer before a dive (choose all that
apply) - ✔✔1. the computer may enter an error mode.
2. you may have to wait 12 hours before you use it again.
✔✔5-4 If your enriched air dive computer fails during a dive - ✔✔ascend immediately,
make a safety stop at 5 metres/15 feet and end the dive.
✔✔6-1 If a diver using enriched air convulses underwater, you should attempt to give
the diver regular air from a pony bottle. - ✔✔False
✔✔6-2 If a diver is suspected of having DCI after a dive using enriched air, you should
(choose all that apply) - ✔✔1. Contact local emergency personnel and diver emergency
services.
2. Administer emergency oxygen and first aid as you normally would.
✔✔KN1 The primary benefit of using enriched air nitrox is that it - ✔✔gives you longer
NO stop times compared to air
✔✔KN2 When using EANx, you should expect narcosis to be - ✔✔no different from
diving with air
✔✔KN3 The primary concern regarding enriched air nitrox and equipment is high
oxygen content. - ✔✔true
✔✔KN4 The recommendations for using equipment, other than cylinders, with enriched
air with up to 40% oxygen, include that (choose all that apply) - ✔✔1. you can use
regular scuba eqipment up to 40% oxygen
QUESTIONS WITH ANSWERS RATED A+
✔✔3-1 Oxygen partial pressure (choose all that apply) - ✔✔1. is used to measure the
concentration of oxygen a diver is exposed to.
2. expresses the part of a gas pressure exerted by the oxygen in the gas.
3. is usually expressed in "atmospheres," abbreviated "ata" or in bar.
4.will vary at a given depth depending upon the oxygen percent.
✔✔3-2 Exposure to increased oxygen partial pressure can make your allowable dive
time - ✔✔shorter.
✔✔3-3 The maximum and contingency oxygen partial pressure limits are - ✔✔1.4
ata/bar and 1.6 ata/bar
✔✔3-4 The primary hazard of exceeding the oxygen exposure limits is - ✔✔a fatal
accident due to convulsing and drowning.
✔✔3-5 Signs and symptoms that may precede a convulsion due to oxygen toxicity
include (choose all that apply) - ✔✔1. visual disturbances.
2. ear ringing.
3. dizziness.
✔✔3-6 If you experience symptoms of oxygen toxicity, you should ascend immediately
and end the dive. - ✔✔True
✔✔3-7 You use your EANx dive computer to manage oxygen exposure by (choose all
that apply) - ✔✔1.setting its maximum PO2at 1.4.
2.staying well within its oxygen limits and above the maximum depth for the blend you're
using.
3.avoiding heavy exercise and carbon dioxide buildup.
4.maintaining good buoyancy and depth control.
✔✔3-8 If you accidentally exceed the oxygen exposure limits for your computer, you
should (choose all that apply) - ✔✔1.ascend immediately but slowly and end the dive.
2.not dive for 24 hours, or as stipulated by the manufacturer.
✔✔4-1 Who must personally verify the analysis of the oxygen content in an enriched air
cylinder before it is used? - ✔✔The diver who will use the cylinder
✔✔4-2 The first step in analyzing enriched air is to calibrate the oxygen analyzer. -
✔✔True
, ✔✔4-3 The standard of practice for the accuracy of enriched air analysis is plus or
minus - ✔✔1%
✔✔4-4 After analyzing enriched air, you should compare the oxygen percent with -
✔✔the percentage marked on the contents sticker or tag.
✔✔5-1 When diving with an enriched air computer (choose all that apply) - ✔✔1. Stay
well within the computer's no stop and oxygen exposure limits.
2. Make safety stops and follow all the conservative diving practices you've already
learned.
3. Know the blend's maximum depth and rely on the computer warning as a secondary
alert only.
✔✔5-2 You set most enriched air computers by letting the computer automatically
analyze the blend you're using. - ✔✔False
✔✔5-3 If you forget to set your enriched air computer before a dive (choose all that
apply) - ✔✔1. the computer may enter an error mode.
2. you may have to wait 12 hours before you use it again.
✔✔5-4 If your enriched air dive computer fails during a dive - ✔✔ascend immediately,
make a safety stop at 5 metres/15 feet and end the dive.
✔✔6-1 If a diver using enriched air convulses underwater, you should attempt to give
the diver regular air from a pony bottle. - ✔✔False
✔✔6-2 If a diver is suspected of having DCI after a dive using enriched air, you should
(choose all that apply) - ✔✔1. Contact local emergency personnel and diver emergency
services.
2. Administer emergency oxygen and first aid as you normally would.
✔✔KN1 The primary benefit of using enriched air nitrox is that it - ✔✔gives you longer
NO stop times compared to air
✔✔KN2 When using EANx, you should expect narcosis to be - ✔✔no different from
diving with air
✔✔KN3 The primary concern regarding enriched air nitrox and equipment is high
oxygen content. - ✔✔true
✔✔KN4 The recommendations for using equipment, other than cylinders, with enriched
air with up to 40% oxygen, include that (choose all that apply) - ✔✔1. you can use
regular scuba eqipment up to 40% oxygen
