SCUBA questions/answers

A repetitive dive is...

Any dive started more than 10 minutes and less than 12 hours after a previous dive.

If caught in a rip current and you wish to get out of it as quickly as possible, what direction should you swim?

At a right angle to the current

What is the primary safety concern for divers when entering or exiting from a shore?

Being knocked down or buffeted by waves.

A thermoclines is:

Boundry layer between layers of warmer and colder water

The buildup of what gas is the trigger for breathing?

CO2

A buddy team plans to dive two shipwrecks in the Straits of Mackinaw. For their first dive they plan to make an 80 foot dive on the Maitland for 20 minutes. After a 1 hour and 30 minute surface interval they plan to make a second dive to 50 feet on the St Andrew for 40 minutes. What is the buddy team's group designation letter after their surface interval?

D

Another term for the "bends" is"

Decompression sickness

What mode should a dive computer be in to get information about your last dive?

DiveLog

A buddy team plans to dive two shipwrecks in the Straits of Mackinaw. For their first dive they plan to make an 80 foot dive on the Maitland for 20 minutes. After a 1 hour and 30 minute surface interval they plan to make a second dive to 50 feet on the St Andrew for 40 minutes. What is the buddy team's group designation letter after the first dive?

E

Aluminum scuba cylinders require visual inspections less frequently than steel tanks

False

Following the Combined Air/EANX dive tables along with proper ascent rates and recommended safety stops guarantees you will not get decompression sickness.

False

If you do not have a computer it is OK to use the data from your buddy's computer to plan and execute your dives.

False

When inspecting the air from a cylinder, a diver discovers that the air has a slight odor and is visibly white. This cylinder is safe to dive with.

False

You can make as many repetitive dives per day as you like, as long as you wait at least 10 minutes between dives.

False

Bottom time (BT) according to your SSI Dive Tables is defined as...

From the time start your descent until the start of your direct ascent to the surface at 30 feet per minute.

Bottom time (BT) according to your Dive Computer is defined as:

From the time you begin your descent to the time you reach the surface at the end of your dive.

A buddy team plans to dive two shipwrecks in the Straits of Mackinaw. For their first dive they plan to make an 80 foot dive on the Maitland for 20 minutes. After a 1 hour and 30 minute surface interval they plan to make a second dive to 50 feet on the St Andrew for 40 minutes. What is their Group designation after their second dive?

I

Equalization should begin when?

Immediately upon descending

When diving from a boat anchored in a current, it is best to start the dive:

Into the current

The two types of tank valves most commonly used are _____________ and ____________.

K, DIN

Underwater most out of air difficulties could be eliminated by...

Monitoring your SPG

While dive tables are based on a square profile, dive computers respond to changing depths and are continually recalculating no-decompression time. What is the result on most dives?

More time underwater without needing decompression stop

High pressure nitrogen has a narcotic effect on humans. This effect is called...

Nitrogen Narcosis

On table 3, N/L stands for...

No limit

What computer feature allows you to view the no-decompression time for the planned depth and current surface interval?

Planning Mode

A Decompression dive is a dive that...

Requires planned decompression stops to eliminate excess nitrogen.

If you have a computer failure during your dive you should...

Signal your buddy, Accend and Refrain from diving for 24 hours.

The correct order for performing a Lost Buddy Procedure is:

Stop, bang on tank, turn 360 degrees for a minute, surface normally

The back and forth movement of water caused by the energy of waves is called:

Surge

What is the best entry to use?

The safest

Calculated by adding Bottom Time (BT) and Residual Time (RT).

Total Time

After draining all water from a BC after a dive, the diver should run fresh water inside the BC as well as rinsing it externally, then promptly drain all the of the rinse water from the BC

True

Decompression Sickness and Overexpansion injuries have similar symptoms and should all be treated as Decompression Illness for purposes of first aid.

True

Many live-aboard dive boats now require that each diver have and use inflatable surface markers.

True

The "root cause" of decompression sickness is diving too deep for too long and ascending too fast.

True

You should avoid depressing the second stage purge button when rinsing the regulator.

True

A burst disk in a tank valve is designed to:

Vent over-pressure in the tank

The most common way waves are generated is:

Wind

The SPG is a gauge that measures what exactly?

air pressure in tank

The second stage of a regulator is designed to deliver air at what pressure? _______________.

ambient

How often should your regulator be serviced by a certified technician?

annually

The deepest point reached during the dive, no matter how briefly you stay there, is called:

depth

When properly weighted a diver on the surface will able to remove all the air from the BC and, when vertical in the water

his/her eyes should rise slightly above the surface when nhaling and when exhaling sink slightly

At depth, the volume of air in our lungs remains the same but the density of the gas...

increases

FIre corals, jellyfish, and anemones have similar stinging cells called:

nematocysts

Without equalizing, a diver who descends will experience a phenomenon commonly referred to as

squeeze

Where in the water column is the greatest percentage of pressure change?

surface to 20 feet

The Michigan "flag law" requires divers to stay within ______ ___ of the dive flag when the divers are on the surface.

100 feet

If you have not been diving in _____________ SSI recommends that you update your skills with a Scuba Skills Update.

12 months

You are an "F" diver and wish to dive to 60 feet. What is your Adjusted No-Decompression Time Limit for this planned dive?

14 minutes

1 ATM is equal to __________ PSI and ________ BAR.

14.7 , 1

At what depth and for how long should a safety stop be made at the end of a dive? ______________ depth _____________ time

15 feet, 3-5 minutes

o help avoid problems it is recommended that you wait a minimum of ______ hours before flying in a pressurized airplane, and _____ hours if you plan to fly, or even drive, above 8000 feet in a nonpressurized aircraft or vehicle.

18,24

The absolute pressure when diving in 33 feet of salt water is equal to how many BAR?

2 BAR

A buddy team plans to dive two shipwrecks in the Straits of Mackinaw. For their first dive they plan to make an 80 foot dive on the Maitland for 20 minutes. After a 1 hour and 30 minute surface interval they plan to make a second dive to 50 feet on the St Andrew for 40 minutes. If the buddy team decided to make a third dive on the St Andrew to 50 feet for 30 minutes what would be the minimum surface interval they would need to make the dive?

2 hours and 3 minutes

If you have had to use the Omitted Decompression procedures what is the minimum time you should wait before diving again?

24 hours

Water conducts body heat away from a diver how many times faster than air? __________

25x

A buddy team plans to dive two shipwrecks in the Straits of Mackinaw. For their first dive they plan to make an 80 foot dive on the Maitland for 20 minutes. After a 1 hour and 30 minute surface interval they plan to make a second dive to 50 feet on the St Andrew for 40 minutes. What is the Resdiual Nitrogen Time (RT) for the second dive?

29 minutes

According to the SSI combined tables a 3-5 minute safety stop at 15 feet is recommended after any dive exceeding what depth?

30 feet

The proper ascent rate for divers is...

30 ft/minute

Objects appear how much larger and closer underwater?

33% larger, 25% closer

At 66 feet we will breath _________ times as much air as at the surface.

3x

A buddy team plans to dive two shipwrecks in the Straits of Mackinaw. For their first dive they plan to make an 80 foot dive on the Maitland for 20 minutes. After a 1 hour and 30 minute surface interval they plan to make a second dive to 50 feet on the St Andrew for 40 minutes. What is the Adjusted No-Decompression Limit for the second dive?

41 minutes

In the U.S. a cylinder must be hydrostatically tested every_____ years, and visually inspected____.

5 years, 1 year

You should always end your dive with at least ______________ psi in your tank.

500 psi

After successfully completing this course, how long do you have to complete your Open Water training without having to take a refresher course?

6 months

The most serious over-expansion injury is:

Air Embolism

You find the following markings on the neck of a scuba cylinder: DOT/TC 3AL 2250 P312345 LUXFER 3*97 S80. What material is the tank made of; when is the next hydro inspection due; and what is working pressure of the tank?

Aluminum; March 2002; 2250 PSI