SDI OPEN WATER SCUBA DIVER EXAM | LATEST UPDATE.
Objects under water appear - Closer and larger than they do on land
How much faster does sound travel in water, compared to air? - 4 times
Water conducts heat away from your body - 25 times faster than air does
As you descend - co...
Objects under water appear - Closer and larger than they do on land
How much faster does sound travel in water, compared to air? - 4 times
Water conducts heat away from your body - 25 times faster than air does
As you descend - colors fade, reds and oranges fade first, 30 meters seem blue and
gray
water temp does your body need thermal protection - 86 degrees
What does SCUBA mean - 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. - Thermocline
What is the primary cause of waves? - wind
Which of the following factors do we take into account when measuring waves? -
Height, Length
Which of the following is incorrect? - Waves are not hazardous to divers during shore
dives
The consequences of becoming cold under water include the following except -
improved judgment and coordination
Because sound travels faster under water: - 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 - true
, which of the following are true - Surge is the back-and-forth movement of water caused
by passing over head
Which of the following are true - 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 - true
longshore currents always move in the same direction as prevailing offshore currents -
false
a rip current is a narrow flow of swiftly moving water that runs parallel to shore - false
the trick to dealing with surge is to anticipate its action in order to avoid contact with
stationary objects - true
what is the most effective way to get out of a rip current - swim parallel to shore, until
out of current
the best time to dive is during a slack tide - true
we pose greater threat to underwater plants and animals - true
what causes most marine life injuries - animals defense response and mistaken identity
what ability best helps helps you avoid damage to the fragile aquatic environment -
buoyancy control
all of the following steps can you take to avoid scrapes and abrasions, except: - wear
minimal exposure protection
some aquatic animals possess stinging cells. These are called: - Nematocysts
marine animals bites almost always the result of the animal defending itself - true
always stay within your level of experience. As an open water diver you should not
venture in overhead environment such as a cave - true
The states of buoyancy include all of the following except - Passive
a scuba cylinder that normally lasts one hour at the surface will last ___ minutes at 20
meters - 20
If you feel pain or discomfort in your ears during descent - ascend to the point where
you can comfortably equalize
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Mboffin. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
