NAUI Underwater Skills & Safety Procedures 4

Question 1

When performing an underwater search pattern, the 'U-pattern' is most appropriate for:

Accepted Answer

Searching a large open area with good visibility

Answer

The U-pattern (or lawn-mower pattern) covers large open areas efficiently when visibility allows divers to maintain consistent swim lanes.

Question 2

A diver finds an unconscious diver underwater with the regulator out of the mouth. The rescuer should first:

Accepted Answer

Replace the regulator or hold the victim's mouth closed and ascend

Answer

Replacing the regulator or sealing the airway prevents water ingestion during the controlled ascent to the surface.

Question 3

What does it mean when a diver gives the 'OK' signal at the surface using one hand making a circle on top of the head?

Accepted Answer

I am OK

Answer

The surface OK signal — hand forming a circle on top of the head — communicates to the boat or shore that the diver is fine.

Question 4

Which gas law explains why a balloon inflated underwater will expand as it is brought to the surface?

Accepted Answer

Boyle's Law

Answer

Boyle's Law states that at constant temperature, gas volume is inversely proportional to pressure — as pressure decreases on ascent, volume increases.

Question 5

A diver with a dry suit experiences a suit inflation malfunction causing uncontrolled ascent. The correct response is:

Accepted Answer

Dump air from the BCD and activate the dry suit exhaust valve

Answer

Simultaneously dumping BCD air and using the dry suit exhaust valve helps control buoyancy during a runaway ascent.

(NAUI) National Association of Underwater Instructors Certification Practice Test

(NAUI) National Association of Underwater Instructors Certification Practice Test

NAUI Underwater Skills & Safety Procedures 4