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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 apart from other training agen...

SDI (Scuba Diving International) Part 2 Questions and Correct Answers the Latest Update and Recommended Version

sdi scuba training chapter 1 Questions and Correct Answers the Latest Update and Recommended Version

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, acc...

Describe all the steps to assemble a BCD and regulator to a scuba cylinder. → Spin the tank around so that the back of the valve is facing you. Place the BCD band(s) over the top of the cylinder so that the back of the BCD is facing you. Raise or lower the BCD so the top is even with the cylinder valve. Fasten the buckles. Remove dust cap, hold first stage in left hand, rotate the chambers until the primary second stage sits on the right. Screw the knob on your first stage until it is...

A ventilated hood, bench grinder, and a heavy duty bench vise are items that are found in the _____________ area of the gun shop. → Welding and Heating Treating According to the video, SDI Intro to Gunsmithing, which mechanism of the 12 gauge pump ejects the shell? → Cartridge Stop In the article titled, Gunsmithing Requires Innovation, the author had trouble finding reference material on which of the following barrel makers? → F. Dumoulin True/False: If the firearm is on saf...

Preparation for disassembly is threefold: Preparation of the Firearm, Preparation of Your Workspace and Tools, and which of the following: → Mental Preparation Which hammer is the workhorse of all the different hammers, capable of handling any project, large or small? → Ball-Peen Hammer Which hammer is usually reserved for smaller jobs, driving smaller pins that require less force? → Brass Hammer When cleaning a firearm, the second step in the process is which of the following: ...

Why is the lathe turning process the most involved? → It involves the greatest investment of tooling. The proper temperature suggested for the browning process was 150°: 200°, but the best way to tell if it is hot enough is if the solution readily evaporates. → True T/F: The lathe turning process is the most involved process because it involves the greatest investment of tooling. → True T/F: The shape of the muzzle is critical primarily for aesthetic reasons. → False What i...

One possible indicator that a barrel is likely to shoot poorly is pitting near the crown. → TRUE Lands in the throat are which are uneven in their short points are usually caused by: → Cleaning Rod Damage According to Joe Carlos, what must you do with a barrel to know for certain what its current capabilities are? → Shoot It T/F: The electropolishing process both improves barrel accuracy and is safe for the environment. → FALSE Joe Carlos' experiment showed that electropol...

What is the absolute pressure (in atm) at 66 feet? → 2 atm What will be the volume in a ball that is filled with two cubic feet of air at 99 feet when it's taken to the surface? → 8 cubic feet How many more times dense is the air in a balloon at 4 atm compared to the air density at the surface? → 4 X as dense What is the abbreviation for an atmosphere? → atm If a scuba cylindar lasts 2 hours (120 minutes) at sea level, how long will it last at 66 feet? → 40 minutes How...