PADI OPEN WATER DIVER FINAL EXAM
QUESTIONS AND SOLUTIONS
AsyaynewlyycertifiedyPADIyOpenyWateryDiver,yIywillybeytrainedytoydiveywithybud
dyyasydeepyasy-yans-18ymetres/60yfeet
Asyyouydescendyinywater,ytheypressurey-yans-increases
Aydepthychangeyofy10ymetres/33yfeetycausesyaypressureychangeyofy-yans-
1ybar/atay(atmosphere)
ifyyouytakey6ylitersyofyairyfromytheysurfaceytoy20ymetres/
66yfeet,ytheyvolumeywillybey-yans-
2ylitresy(theydensityyofytheyairywouldybeythreeytimesytheydensityyatytheysurface)
Ayballoonyfullyyinflatedyandysealedyaty10ymetres/
33yfeet,ywouldyprobablyy______yduringyascentytoytheysurfacey-yans-burst
Aysqueezeyisycausedybyy-yans-
aypressureyimbalanceybetweenytheysurroundingypressureyandyanyairyspace
Equalizationyisytheyprocessyofy-yans-addingyairytoyanyairyspace
Theymostyimportantyruleyinyscubaydivingyisytoy-yans-
breatheycontinuouslyyandyneveryholdyyourybreath
DuringyascentyIyfeelydiscomfortyinymyyears.yIyshouldy-yans-
stop,ydescendyslightly,yandyallowytrappedyairytoyworkyitsywayyout
MyybuddyyandyIydescendytoy12ymetres/
40yfeet.yIywouldyexpectytoyuseymyyairy_____yaty6ymetres/20yfeety-yans-
fasterythan
Theymostyefficientywayytoybreatheydenseyairyunderwateryisytoybreathey-yans-
deeplyyandyslowly
Buoyancyy-yans-ayforceythatypushesyanyobjectyinywateryupward
Saltywaterycausesymoreybuoyancyythanyfreshywaterybecauseyityisy_____ydensey
andyweighsy_____y-yans-more
, WhenyIydescend,ymyybuoyancyytendsytoy________.yWhenyIyascend,yitytendsyto
y_______y-yans-decrease,yincrease
Theythreeymostyimportantyconsiderationsyinychoosingyscubayequipmentyareysuitab
ility,yfit,yandy-yans-comfort
Theytwoybasicyfinystylesyarey__________yfinsy-yans-adjustableyandyfull-foot
Myyprimaryyconsiderationsywhenychoosingyfinsyareyfityandy-yans-bladeysize
BCDy(buoyancyycontrolydevice)y-yans-
holdsyyourykitytogetheryandyallowsyyouytoyadjustybuoyancyythroughoutytheydive
Regulatory-yans-
deliversybreathingyairyatytheysurroundingypressureywhenyyouyinhaleyandydirectsy
exhaledyairyintoytheyair
Cylindery-yans-holdsytheyhigh-
pressureybreathingyairysuppliedybyyyouryregulatoryduringytheydive
WeightySystemy-yans-
holdsyleadyweightytoycounteractytheypositiveybuoyancyyofyyourybodyyandysomey
ofyyouryequipment,ywithyaymechanismyforydroppingysomeyoryallytheyweightyinya
nyemergency
TheyfiveycomponentsythatymakeyupyayBCDyincludey-yans-
anyinflatableybladder,yaycylinderybandyandyharness/jacket,yanyLPIy(low-
pressureyinflator)ymechanism,yanyoverpressure/
quickyexhaustyvalves,yandyayweightysystem
LPIymechanismy-yans-inflatesytheyBCDywithyairyfromymyyscubaycylinder
Burstydisky-yans-
aysafetyydeviceythatyrelievesyaccidentalyoverpressureybyyreleasingyairybeforeyrea
chingytheypressureyatywhichytheycylinderywouldyfail
scubaycylindersyrequireypressureytestingy_______yandyvisualyinspectiony________
_y-yans-everyy2-5yyears,yannually
Theymostyimportantyfeatureyinymyyweightysystemyisyitsy-yans-quickyrelease
Trimymeansyhavingytheyrighty_____yofyweighty-yans-distribution
Failureytoyfollowytheymostyimportantyruleyinyscubaydivingycanycauseyseriousylung
yoverexpansionyinjuries,ywhichyinyturnycanycauseyparalysisyandydeathy-yans-true
QUESTIONS AND SOLUTIONS
AsyaynewlyycertifiedyPADIyOpenyWateryDiver,yIywillybeytrainedytoydiveywithybud
dyyasydeepyasy-yans-18ymetres/60yfeet
Asyyouydescendyinywater,ytheypressurey-yans-increases
Aydepthychangeyofy10ymetres/33yfeetycausesyaypressureychangeyofy-yans-
1ybar/atay(atmosphere)
ifyyouytakey6ylitersyofyairyfromytheysurfaceytoy20ymetres/
66yfeet,ytheyvolumeywillybey-yans-
2ylitresy(theydensityyofytheyairywouldybeythreeytimesytheydensityyatytheysurface)
Ayballoonyfullyyinflatedyandysealedyaty10ymetres/
33yfeet,ywouldyprobablyy______yduringyascentytoytheysurfacey-yans-burst
Aysqueezeyisycausedybyy-yans-
aypressureyimbalanceybetweenytheysurroundingypressureyandyanyairyspace
Equalizationyisytheyprocessyofy-yans-addingyairytoyanyairyspace
Theymostyimportantyruleyinyscubaydivingyisytoy-yans-
breatheycontinuouslyyandyneveryholdyyourybreath
DuringyascentyIyfeelydiscomfortyinymyyears.yIyshouldy-yans-
stop,ydescendyslightly,yandyallowytrappedyairytoyworkyitsywayyout
MyybuddyyandyIydescendytoy12ymetres/
40yfeet.yIywouldyexpectytoyuseymyyairy_____yaty6ymetres/20yfeety-yans-
fasterythan
Theymostyefficientywayytoybreatheydenseyairyunderwateryisytoybreathey-yans-
deeplyyandyslowly
Buoyancyy-yans-ayforceythatypushesyanyobjectyinywateryupward
Saltywaterycausesymoreybuoyancyythanyfreshywaterybecauseyityisy_____ydensey
andyweighsy_____y-yans-more
, WhenyIydescend,ymyybuoyancyytendsytoy________.yWhenyIyascend,yitytendsyto
y_______y-yans-decrease,yincrease
Theythreeymostyimportantyconsiderationsyinychoosingyscubayequipmentyareysuitab
ility,yfit,yandy-yans-comfort
Theytwoybasicyfinystylesyarey__________yfinsy-yans-adjustableyandyfull-foot
Myyprimaryyconsiderationsywhenychoosingyfinsyareyfityandy-yans-bladeysize
BCDy(buoyancyycontrolydevice)y-yans-
holdsyyourykitytogetheryandyallowsyyouytoyadjustybuoyancyythroughoutytheydive
Regulatory-yans-
deliversybreathingyairyatytheysurroundingypressureywhenyyouyinhaleyandydirectsy
exhaledyairyintoytheyair
Cylindery-yans-holdsytheyhigh-
pressureybreathingyairysuppliedybyyyouryregulatoryduringytheydive
WeightySystemy-yans-
holdsyleadyweightytoycounteractytheypositiveybuoyancyyofyyourybodyyandysomey
ofyyouryequipment,ywithyaymechanismyforydroppingysomeyoryallytheyweightyinya
nyemergency
TheyfiveycomponentsythatymakeyupyayBCDyincludey-yans-
anyinflatableybladder,yaycylinderybandyandyharness/jacket,yanyLPIy(low-
pressureyinflator)ymechanism,yanyoverpressure/
quickyexhaustyvalves,yandyayweightysystem
LPIymechanismy-yans-inflatesytheyBCDywithyairyfromymyyscubaycylinder
Burstydisky-yans-
aysafetyydeviceythatyrelievesyaccidentalyoverpressureybyyreleasingyairybeforeyrea
chingytheypressureyatywhichytheycylinderywouldyfail
scubaycylindersyrequireypressureytestingy_______yandyvisualyinspectiony________
_y-yans-everyy2-5yyears,yannually
Theymostyimportantyfeatureyinymyyweightysystemyisyitsy-yans-quickyrelease
Trimymeansyhavingytheyrighty_____yofyweighty-yans-distribution
Failureytoyfollowytheymostyimportantyruleyinyscubaydivingycanycauseyseriousylung
yoverexpansionyinjuries,ywhichyinyturnycanycauseyparalysisyandydeathy-yans-true
