Objects underwater appear Study guides, Class notes & Summaries
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SDI Scuba Certification Exam Study Guide Questions And Answers Latest Updates
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What type of marine life cause most diving injuries? - ️️Most diving injuries result 
from animal's defensive response to a perceived threat 
How much larger and closer do objects appear underwater and why? - ️️Objects 
underwater appear 25% larger and 25% closer 
What sets SDI apart from other training agencies? - ️️First dive training agency to 
provide entry level scuba instruction that incorporates the use of personal dive 
computers --> more streamlined scuba course w/ more ...
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SDI Open Water Scuba Diver Exam 2024 Questions with 100% Correct Answers | Verified | Latest Update 20242025
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1.	Objects under water appear 
ANS Closer and larger than they do on land 
2.	How much faster does sound travel in water, compared to air? 
ANS 4 times 
3.	Water conducts heat away from your body 
ANS 25 times faster than air does 
4.	As you descend 
ANS colors fade, reds and oranges fade first, 30 meters seem blue and gray 
5.	water temp does your body need thermal protection 
ANS 86 degrees 
6.	What does SCUBA mean 
ANS self-contained underwater breathing apparatus 
7.	When water stratifies it...
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SDI SCUBA CERTIFICATION EXAM STUDY GUIDE| LATEST UPDATE
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SDI SCUBA CERTIFICATION EXAM STUDY GUIDE| LATEST UPDATE 
 
 
 
 
Define SCUBA - S - self 
C - contained 
U - underwater 
B - breathing 
A - apparatus 
 
List 3 important scuba diving changes that occurred in 1950s - 1) published USN dive tables 
2) invented the personal dive computer 
3) equipment manufacturers made improvements to the design and workmanship of gear 
 
Name 3 different devices that modern dive computers replace - 1) dive tables 
2) J-valves 
3) depth gauges 
 
What sets SDI...
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SDI Final Exam 65 Questions with 100% Correct Answers | Verified | Latest Update 2024
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1.	Objects under water appear 
1: The same size as they do on land. 2: Twice as large as they do on land. 
3: Closer and larger than they do on land. 
4: Smaller and farther away than they do on land.: Closer and larger than they do on land. 
2.	As you descend: 
1: Colors appear to fade. 
2: Reds and oranges are among the first colors to disappear. 
3: At 30 m/99 ft, little color remains other than blues, grays, blacks and whites. 4: All of the above.: All of the above. 
3.	Which of the followin...
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SDI OPEN WATER SCUBA DIVER EXAM 2024 WITH 100% ACCURATE ANSWERS
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SDI OPEN WATER SCUBA DIVER EXAM 2024 WITH 100% ACCURATE ANSWERS 
 
 
Objects under water appear - correct answer Closer and larger than they do on land 
 
How much faster does sound travel in water, compared to air? - correct answer 4 times 
 
Water conducts heat away from your body - correct answer 25 times faster than air does 
 
As you descend - correct answer colors fade, reds and oranges fade first, 30 meters seem blue and gray 
 
water temp does your body need thermal protection - correct ...
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SSI SCUBA Open Water Diving Certification Questions with 100% Correct Answers | Latest Version 2024 | Verified
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The purpose of equalization is to - Introduce additional air into body air spaces in response to 
increasing external pressure 
Body heat is lost ________ than in air - 25 to 30 times faster 
The absolute pressure expressed in terms of atmospheres absolute at 99 feet in salt water - 4 ata 
One atmosphere of pressure is defined as - - Each 34 feet of depth in freshwater 
- 1 ata 
- Each 33 feet of depth in sea water 
Describing diving with the acronym SCUBA came from what event? - The development...
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SDI Final Exam | 65 Questions with 100% Correct Answers | Verified | Updated 20234
- Exam (elaborations) • 18 pages • 2024
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Objects under water appear: 1: The same size as they do on land. 2: Twice as large as they do on land. 3: Closer and larger than they do on land. 4: Smaller and farther away than they do on land. - Closer and larger than they do on land. As you descend: 1: Colors appear to fade. 2: Reds and oranges are among the first colors to disappear. 3: At 30 m/99 ft, little color remains other than blues, grays, blacks and whites. 4: All of the above. - All of the above. Which of the following statements i...
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SDI CERTIFICATION SCUBA EXAM REVIEW QUESTIONS 2024|VERIFIED|ACCURATE ANSWERS
- Exam (elaborations) • 34 pages • 2024
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SDI CERTIFICATION SCUBA EXAM REVIEW QUESTIONS 2024 
SDI CERTIFICATION SCUBA EXAM REVIEW QUESTIONS 2024|VERIFIED|ACCURATE ANSWERS 
 
 
What does SCUBA stand for? - Accurate AnswerSelf. 
Contained 
Underwater 
Breathing 
Apparatus 
 
List the three important scuba diving changes that occurred in the 1950s - Accurate Answer1) Dive tables published for repetitive dives 
2) Improved design/quality of scuba gear 
3) Dive computers commercially available 
 
Name three different devices that modern d...
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SDI Final Exam Questions and Answers | Latest Update 2024/2025
- Exam (elaborations) • 32 pages • 2024
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Objects under water appear: 
1: The same size as they do on land. 
2: Twice as large as they do on land. 
3: Closer and larger than they do on land. 
4: Smaller and farther away than they do on land. 
 ~~> Closer and larger than they do on land. 
As you descend: 
1: Colors appear to fade. 
2: Reds and oranges are among the first colors to disappear. 
3: At 30 m/99 ft, little color remains other than blues, grays, blacks and whites. 
4: All of the above. 
 ~~> All of the above. 
Which of th...
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SDI Final Exam | 65 Questions with 100% Correct Answers | Verified | Updated 2024
- Exam (elaborations) • 25 pages • 2024
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- $13.00
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Objects under water appear: 
1: The same size as they do on land. 
2: Twice as large as they do on land. 
3: Closer and larger than they do on land. 
4: Smaller and farther away than they do on land. - Closer and larger than they do on land. 
As you descend: 
1: Colors appear to fade. 
2: Reds and oranges are among the first colors to disappear. 
3: At 30 m/99 ft, little color remains other than blues, grays, blacks and whites. 
4: All of the above. - All of the above. 
Which of the following st...
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