SDI Certification Exam Review Questions and Correct Answers

SDI Certification Exam Review Questions and Correct Answers


1. What does SCUBA stand for?: Self Conta
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ined
Underwater h


Breathing Ap h


paratus
2. List the three important scuba diving changes that occurred in the 1950s: 1) Dive tables
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published for repetitive dives h h h


2) Improved design/quality of scuba gear h h h h


3) Dive computers commercially available
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3. Name three different devices that modern dive computers replace: Depth gauge, div
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e tables, watch
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4. What sets SDI apart from other training agencies?: Students use a personal dive compu
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ter for all instruction and certification dives
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5. How much larger and closer do objects appear under water and why?: 33% larger, 25%
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closer
Light bends in the air-space between the lens and your eyes.
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6. How much faster does sound move through water than air and why?: 4 times faster in wat
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er
Water is 800x denser than air; sound travels through denser mediums at faster rates
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7. What is the first color absorbed underwater?: RED (followed by OYGBIV)
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8. When diving from shore, the best time to dive is when there is the least amount of
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tidal current.
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tide is when there is no horizontal water movement.: Slack
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9. If you are caught in a rip current, first swim
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to the current to get out of it before swimming towards shore.: Perpendicular
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10. Start your dive by swimming h the current: into/against
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11. Global currents are h h h


. Local currents
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1h/h8

, .: Fixed Fluctuate
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12. Rip current: Current which goes seaward due to ocean floor stuctures
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13. Long shore current: Flows parallel to shore
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14. Waves are caused by: energy generated by WIND
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15. Tides are caused by: polarity of the moon
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16. T/F: Anticipate surge action to avoid contact with stationary objects.: True
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17. What is surge: Back and forth motion underwater which you shouldn't fight; move de
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eper and away from dangerous objects if caught in one. USE THEM TO YOUR ADVANTAGE
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2h/h8