DM part 2

Scuba cylinders are typically constructed of ____________ or ____________.

• Magnesium, Steel

• Magnesium, Aluminum

• Steel, Aluminum

• Steel, Composite

________ testing is periodically required on all scuba cylinders to ensure that they may continue to be safely filled to their service pressure.

• Fail-Safe

• Hydrostatic

• Visual

• Aerostatic

What types of dive plans mandate the use of a redundant gas supply?

• On any dive so that the diver looks cool.

• On dive plans which require the diver to be more self sufficient, such as solo diving.

• Any dive deeper than 60 feet.

• Redundant gas supplies are never required, they are always an option.

True or False: Any weight system should allow the weights to be quickly and reliably discarded in case of emergency.

• True

• False

True or False: The neoprene in a wet suit compresses as a diver descends, resulting in decreased buoyancy.

• True

• False

Local regulations may require that a dive team tow a ________ to mark their position at the surface.

• Boat

• Buoy

• Rope

• Dive Flag

When equipping new divers, what is the most common mistake made by Instructors and Divemasters?

• Using too much exposure protection

• Improperly fitting BCDs

• Overweighting

• Using inadequate or improper regulator systems

What is the NDL for a dive to 21.3m/70ft?

• A. 30 Minutes

• B. 40 Minutes

• C. 50 Minutes

• D. 60 Minutes

A diver in pressure group E plans a dive to 22.5m/75ft. What is his NDL for this dive?

• A. 17 Minutes

• B. 20 Minutes

• C. 23 Minutes

• D. 32 Minutes

A diver in pressure group D wants to dive to 22.5m/75ft for 25 minutes. How long must he remain out of the water in order to do this dive?

• 50 minutes

• 1:00 hour

• 1:10 (70 minutes)

• 1:15 (75 minutes)