SDI Certification Exam Review
Questions and Answers8
Name the steps of the buddy check - ANSWERS-ABCs
Air
Buoyancy
Computer
Dive Gear
Enter water
What should you do is you lose your buddy? - ANSWERS-Look around for no more than 1
minute then ascend to surface; if not at surface call for help
How do you conduct a safety stop? - ANSWERS-Conducted at 15 ft for 3-5 minutes before
surfacing
How much air should remain in your cylinder upon completing a dive? - ANSWERS-500 psi
What two ways do a PDC alert you on ascending too fast? - ANSWERS-
What does SCUBA stand for? - ANSWERS-Self
Contained
Underwater
Breathing
Apparatus
, List the three important scuba diving changes that occurred in the 1950s - ANSWERS-1) Dive
tables published for repetitive dives
2) Improved design/quality of scuba gear
3) Dive computers commercially available
Name three different devices that modern dive computers replace - ANSWERS-Depth gauge,
dive tables, watch
What sets SDI apart from other training agencies? - ANSWERS-Students use a personal dive
computer for all instruction and certification dives
How much larger and closer do objects appear under water and why? - ANSWERS-33% larger,
25% closer
Light bends in the air-space between the lens and your eyes.
How much faster does sound move through water than air and why? - ANSWERS-4 times faster
in water
Water is 800x denser than air; sound travels through denser mediums at faster rates
What is the first color absorbed underwater? - ANSWERS-RED (followed by OYGBIV)
When diving from shore, the best time to dive is when there is the least amount of tidal current.
_____ tide is when there is no horizontal water movement. - ANSWERS-Slack
If you are caught in a rip current, first swim _____ to the current to get out of it before
swimming towards shore. - ANSWERS-Perpendicular
Questions and Answers8
Name the steps of the buddy check - ANSWERS-ABCs
Air
Buoyancy
Computer
Dive Gear
Enter water
What should you do is you lose your buddy? - ANSWERS-Look around for no more than 1
minute then ascend to surface; if not at surface call for help
How do you conduct a safety stop? - ANSWERS-Conducted at 15 ft for 3-5 minutes before
surfacing
How much air should remain in your cylinder upon completing a dive? - ANSWERS-500 psi
What two ways do a PDC alert you on ascending too fast? - ANSWERS-
What does SCUBA stand for? - ANSWERS-Self
Contained
Underwater
Breathing
Apparatus
, List the three important scuba diving changes that occurred in the 1950s - ANSWERS-1) Dive
tables published for repetitive dives
2) Improved design/quality of scuba gear
3) Dive computers commercially available
Name three different devices that modern dive computers replace - ANSWERS-Depth gauge,
dive tables, watch
What sets SDI apart from other training agencies? - ANSWERS-Students use a personal dive
computer for all instruction and certification dives
How much larger and closer do objects appear under water and why? - ANSWERS-33% larger,
25% closer
Light bends in the air-space between the lens and your eyes.
How much faster does sound move through water than air and why? - ANSWERS-4 times faster
in water
Water is 800x denser than air; sound travels through denser mediums at faster rates
What is the first color absorbed underwater? - ANSWERS-RED (followed by OYGBIV)
When diving from shore, the best time to dive is when there is the least amount of tidal current.
_____ tide is when there is no horizontal water movement. - ANSWERS-Slack
If you are caught in a rip current, first swim _____ to the current to get out of it before
swimming towards shore. - ANSWERS-Perpendicular
