SDI SCUBA CERTIFICATION EXAM 2026/2027 –
COMPREHENSIVE STUDY GUIDE WITH 100%
CORRECT VERIFIED ANSWERS.
◎ How much faster does sound travel in water, compared to air?. ANSWER:- 4 times
◎ Water conducts heat away from your body. ANSWER:- 25 times faster than air does
◎ As you descend. ANSWER:- colors fade, reds and oranges fade first, 30 meters
seem blue and gray
◎ water temp does your body need thermal protection. ANSWER:- 86 degrees
◎ What does SCUBA mean. ANSWER:- self-contained underwater breathing
apparatus
◎ When water stratifies itself into layers, according to temperature, the boundary
between layers is known as a(n):
1: Halocline.
2: Ichtyocline.
3: Thermodyne.
4: Thermocline.. ANSWER:- Thermocline
◎ What is the primary cause of waves?. ANSWER:- wind
◎ Which of the following factors do we take into account when measuring waves?.
ANSWER:- Height, Length
◎ Which of the following is incorrect?. ANSWER:- Waves are not hazardous to divers
during shore dives
◎ The consequences of becoming cold under water include the following except.
ANSWER:- improved judgment and coordination
◎ Because sound travels faster under water:. ANSWER:- Its harder to determine the
direction from which a sound is coming
◎ Entering through surf requires special skills. These skills are often included in
beginning scuba course taught in areas in which surf entries are common. ANSWER:-
true
, ◎ which of the following are true. ANSWER:- Surge is the back-and-forth movement of
water caused by passing over head
◎ Which of the following are true. ANSWER:- The sun warming water near the equator,
coupled with the earth's rotation, is the primary cause of permanent ocean currents
◎ despite its apparent warmth, divers in warm waters still need to consider to wear
protection. ANSWER:- true
◎ longshore currents always move in the same direction as prevailing offshore
currents. ANSWER:- false
◎ a rip current is a narrow flow of swiftly moving water that runs parallel to shore.
ANSWER:- false
◎ the trick to dealing with surge is to anticipate its action in order to avoid contact with
stationary objects. ANSWER:- true
◎ what is the most effective way to get out of a rip current. ANSWER:- swim parallel to
shore, until out of current
◎ the best time to dive is during a slack tide. ANSWER:- true
◎ we pose greater threat to underwater plants and animals. ANSWER:- true
◎ what causes most marine life injuries. ANSWER:- animals defense response and
mistaken identity
◎ what ability best helps helps you avoid damage to the fragile aquatic environment.
ANSWER:- buoyancy control
◎ all of the following steps can you take to avoid scrapes and abrasions, except:.
ANSWER:- wear minimal exposure protection
◎ some aquatic animals possess stinging cells. These are called:. ANSWER:-
Nematocysts
◎ marine animals bites almost always the result of the animal defending itself.
ANSWER:- true
◎ always stay within your level of experience. As an open water diver you should not
venture in overhead environment such as a cave. ANSWER:- true
◎ The states of buoyancy include all of the following except. ANSWER:- Passive
COMPREHENSIVE STUDY GUIDE WITH 100%
CORRECT VERIFIED ANSWERS.
◎ How much faster does sound travel in water, compared to air?. ANSWER:- 4 times
◎ Water conducts heat away from your body. ANSWER:- 25 times faster than air does
◎ As you descend. ANSWER:- colors fade, reds and oranges fade first, 30 meters
seem blue and gray
◎ water temp does your body need thermal protection. ANSWER:- 86 degrees
◎ What does SCUBA mean. ANSWER:- self-contained underwater breathing
apparatus
◎ When water stratifies itself into layers, according to temperature, the boundary
between layers is known as a(n):
1: Halocline.
2: Ichtyocline.
3: Thermodyne.
4: Thermocline.. ANSWER:- Thermocline
◎ What is the primary cause of waves?. ANSWER:- wind
◎ Which of the following factors do we take into account when measuring waves?.
ANSWER:- Height, Length
◎ Which of the following is incorrect?. ANSWER:- Waves are not hazardous to divers
during shore dives
◎ The consequences of becoming cold under water include the following except.
ANSWER:- improved judgment and coordination
◎ Because sound travels faster under water:. ANSWER:- Its harder to determine the
direction from which a sound is coming
◎ Entering through surf requires special skills. These skills are often included in
beginning scuba course taught in areas in which surf entries are common. ANSWER:-
true
, ◎ which of the following are true. ANSWER:- Surge is the back-and-forth movement of
water caused by passing over head
◎ Which of the following are true. ANSWER:- The sun warming water near the equator,
coupled with the earth's rotation, is the primary cause of permanent ocean currents
◎ despite its apparent warmth, divers in warm waters still need to consider to wear
protection. ANSWER:- true
◎ longshore currents always move in the same direction as prevailing offshore
currents. ANSWER:- false
◎ a rip current is a narrow flow of swiftly moving water that runs parallel to shore.
ANSWER:- false
◎ the trick to dealing with surge is to anticipate its action in order to avoid contact with
stationary objects. ANSWER:- true
◎ what is the most effective way to get out of a rip current. ANSWER:- swim parallel to
shore, until out of current
◎ the best time to dive is during a slack tide. ANSWER:- true
◎ we pose greater threat to underwater plants and animals. ANSWER:- true
◎ what causes most marine life injuries. ANSWER:- animals defense response and
mistaken identity
◎ what ability best helps helps you avoid damage to the fragile aquatic environment.
ANSWER:- buoyancy control
◎ all of the following steps can you take to avoid scrapes and abrasions, except:.
ANSWER:- wear minimal exposure protection
◎ some aquatic animals possess stinging cells. These are called:. ANSWER:-
Nematocysts
◎ marine animals bites almost always the result of the animal defending itself.
ANSWER:- true
◎ always stay within your level of experience. As an open water diver you should not
venture in overhead environment such as a cave. ANSWER:- true
◎ The states of buoyancy include all of the following except. ANSWER:- Passive
