The best place for me to position an alternate air source is

Question

loose by my side so I can find it fast.
in the triangle area formed by my chin and the lower corners of my rib cage.
to the base of my cylinder.
to the back of my BCD between my shoulder blades and waist.

Answer 1

In the triangle area formed by my chin and the lower corners of my rib cage.

Answer 2

Lung overexpansion injuries can be caused by
scuba diving without a buddy.
continuing a dive when not properly weighted.
not drinking enough water before scuba diving.
holding my breath while scuba diving.

Answer 3

Holding my breath while scuba diving.

Answer 4

If my cylinder of air lasts 60 minutes while I am at the surface breathing normally, assuming all else is the same, how long will it last at 20 metres/66 feet breathing normally?
60 minutes
20 minutes
15 minutes
12 minutes

Answer 5

12 minutes.

Answer 6

The difference between DIN valves and yoke valves is that DIN valves
are made from durable plastic.
contain a spring-operated shutoff valve that is held open by cylinder pressure.
have an o-ring in them.
have threaded openings to screw the regulator into.

Answer 7

Have threaded openings to screw the regulator into.

Answer 8

Which of the following is part of proper care for my scuba cylinder?
Sand and repaint it every year.
Dry it in the sun.
Keep some air in it.
Have it pressure tested every month.

Answer 9

Keep some air in it.