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Exam (elaborations)

Sdi Upgraded Final Exam

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2024/2025 Written for academic year
Institution SDI
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What does SCUBA stand for? - CORRECT ANSWER -Self Contained Underwater Breathing Apparatus List the three important scuba diving changes that occurred in the 1950s - CORRECT ANSWER -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 - CORRECT ANSWER -Depth gauge, dive tables, watch What sets SDI apart from other training agencies? - CORRECT ANSWER -Students use a personal dive computer for all instruction and certification dives How much larger and closer do objects appear under water and why? - CORRECT ANSWER -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? - CORRECT ANSWER -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? - CORRECT ANSWER -RED (followed by OYGBIV)

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SDI UPGRADED FINAL EXAM
WhatqdoesqSCUBAqstandqfor?q-qCORRECTqANSWERq-Self

Containedq

Underwater

Breathingq

Apparatus



Listqtheqthreeqimportantqscubaqdivingqchangesqthatqoccurredqinqtheq1950sq-qCORRECTqANSWERq-
1)qDiveqtablesqpublishedqforqrepetitiveqdives

2)qImprovedqdesign/qualityqofqscubaqgear

3)qDiveqcomputersqcommerciallyqavailable



Nameqthreeqdifferentqdevicesqthatqmodernqdiveqcomputersqreplaceq-qCORRECTqANSWERq-
Depthqgauge,qdiveqtables,qwatch



WhatqsetsqSDIqapartqfromqotherqtrainingqagencies?q-qCORRECTqANSWERq-
Studentsquseqaqpersonalqdiveqcomputerqforqallqinstructionqandqcertificationqdives



Howqmuchqlargerqandqcloserqdoqobjectsqappearqunderqwaterqandqwhy?q-qCORRECTqANSWERq-
33%qlarger,q25%qcloser

Lightqbendsqinqtheqair-spaceqbetweenqtheqlensqandqyourqeyes.



Howqmuchqfasterqdoesqsoundqmoveqthroughqwaterqthanqairqandqwhy?q-qCORRECTqANSWERq-
4qtimesqfasterqinqwater

Waterqisq800xqdenserqthanqair;qsoundqtravelsqthroughqdenserqmediumsqatqfasterqrates



Whatqisqtheqfirstqcolorqabsorbedqunderwater?q-qCORRECTqANSWERq-REDq(followedqbyqOYGBIV)

, Whenqdivingqfromqshore,qtheqbestqtimeqtoqdiveqisqwhenqthereqisqtheqleastqamountqofqtidalqcurrent.q_____q
tideqisqwhenqthereqisqnoqhorizontalqwaterqmovement.q-qCORRECTqANSWERq-Slack



Ifqyouqareqcaughtqinqaqripqcurrent,qfirstqswimq_____qtoqtheqcurrentqtoqgetqoutqofqitqbeforeqswimmingqtowar
dsqshore.q-qCORRECTqANSWERq-Perpendicular



Startqyourqdiveqbyqswimmingq____qtheqcurrentq-qCORRECTqANSWERq-into/against



Globalqcurrentsqareq_____.

Localqcurrentsq____.q-qCORRECTqANSWERq-Fixed

Fluctuate



Ripqcurrentq-qCORRECTqANSWERq-Currentqwhichqgoesqseawardqdueqtoqoceanqfloorqstuctures



Longqshoreqcurrentq-qCORRECTqANSWERq-Flowsqparallelqtoqshore



Wavesqareqcausedqbyq-qCORRECTqANSWERq-energyqgeneratedqbyqWIND



Tidesqareqcausedqbyq-qCORRECTqANSWERq-polarityqofqtheqmoon



T/F:qAnticipateqsurgeqactionqtoqavoidqcontactqwithqstationaryqobjects.q-qCORRECTqANSWERq-True



Whatqisqsurgeq-qCORRECTqANSWERq-
Backqandqforthqmotionqunderwaterqwhichqyouqshouldn'tqfight;qmoveqdeeperqandqawayqfromqdangerousqo
bjectsqifqcaughtqinqone.qUSEqTHEMqTOqYOURqADVANTAGE

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