Q.26 At a depth of 10m, gas volume is [ ] on land.
Atwice that as B1/2 of that C1/3 of that Dthe same as non-answer
Q.27 Atmospheric air consists of [ ]% oxygen, [ ]% nitrogen, and about 1% other gases.
A21 / 78 B51 / 48 C41 / 58 D71 / 28 non-answer
Q.28 If you hold your breath while ascending, you’re in danger of experiencing [ ].
Alung squeeze Ba lung over-expansion injury Cdizziness Dblackout non-answer
Q.29 When hearing underwater, the direction of sound is [ ].
Aalways below Balways above Ceasy to know Ddifficult to know non-answer
Q.30 It is a good idea to [ ] when diving.
Atake big, fast breaths Btake small, slow breaths Ctake small, fast breaths Dtake big, slow breaths non-answer
Q.31 If pressure doubles, gas volume becomes [ ].
A2 times greater B1/4 C1/2 D4 times greater non-answer
Q.32 You should [ ] once you notice you’re experiencing nitrogen narcosis.
Amake a decompression stop Btake a big, slow breath Cstop any movement Dsafely ascend to a shallower depth non-answer
Q.33 When snorkeling, excess hyperventilation [ ].
Ais necessary Bshould never be done Cis sometimes done Dshould be your goal non-answer
Q.34 Squeeze can occur when/due to [ ].
Amaking a descent Bpoor physical condition Ccold water temperature Dmaking an ascent non-answer
Q.35 Reverse block can occur when/due to [ ].
Amaking an ascent Bmaking a descent Chunger Dwarm water temperature non-answer
Q.36 To prevent reverse block in your middle ear or sinus cavities, you should [ ].
Amaintain your health Blimit your time diving at depth Climit your diving time Dcomplete a mask clear non-answer
[Plan and Rules]
Q.37 This is very important for maintaining good health for diving.
Abeing well-rested Bhaving some drinks the night before Chaving a great suntan Dbeing on a diet non-answer
Q.38 When it comes to diving, the most important thing to keep in mind is [ ].
Abeing adventurous Bsafety Chaving the best gear Dseeing marine life non-answer
Q.39 The best dive plans [ ]safety stops.
Aare also fine if they have Bshould have Cprohibit Davoid if at all possible non-answer
Q.40 The best dive plans [ ] decompression stops.
Aavoid if at all possible Bshould have Care also fine if they have Dprohibit non-answer
Q.41 When repetitive diving, dives from the second onwards should be planned [ ].
Agradually deeper Bequally as deep as the previous dive Cat a different depth Dgradually shallower non-answer
Q.42 The ideal surface interval time is [ ].
Aat least 1 hour Bat least 3 hours Cat least 10 minutes Dshort non-answer
Q.43 The hand signal on the right indicates [ ].
AThat’s really big BDescend COk! DAscend non-answer
Q.44 For dive plans, the ideal remaining tank pressure after a dive is at least [ ].
A0 bar B100 bar C50 bar D20 bar non-answer
Q.45 The No-decompression dive limit for a depth of 18m is [ ] minutes.
A30 B40 C64 D50 non-answer
Q.46 If you become separated from your buddy or group while diving, you should [ ].
Abegin an underwater search Bexit the water Cact according to the plan you discussed and decided upon in your pre-dive planning Dsafely ascend to the surface non-answer
Q.47 You dived for 30 minutes at 18m.Which letter category are you in your dive table calculations?
AE BD CG DF non-answer
Q.48 It is necessary to review hand signals before a dive with [ ].
Asome individuals Byour dive buddies Cyour dive leader Dall members in the group non-answer
Q.49 When you haven’t been diving for a long period of time, it’s good to [ ].
Abe well-rested Btake a refresher course Cdrink little alcohol Dbuy a dive computer non-answer
Q.50 When ocean conditions, etc, change and present possible dangers, the dive plan [ ].
Ais fine as is Bshould be submitted to the police Cshould be adapted accordingly Dshould be submitted to the Coast Guard non-answer
Q.51 The hand signal on the right indicates [ ].
AI can’t hear BI understand CMe/My DI’m having problems equalizing my ears non-answer
Q.52 If a diver who was category “E” has had a 1-hour, 30-minutes Surface Interval, and dives again, this time to depth of 15m, what is the new no-decompression dive time [ minutes ]?
A13 B64 C51 D32 non-answer
Q.53 If a diver who was category “E” has had a 1-hour, 30-minutes Surface Interval, and dives again, this time to depth of 15m, what is the Residual Nitrogen Time [ minutes ].
A64 B51 C13 D32 non-answer
Q.54 If a diver who was category “E” has had a 1-hour, 30-minutes Surface Interval, and dives again, this time for 35 minutes to depth of 15m, which letter category are you in your dive table calculations?