Scuba Diving Open Water 4

Question 1

What does a dive computer's 'no-decompression limit' (NDL) tell a diver?

Accepted Answer

The maximum time at current depth before required decompression stops are needed

Answer

The NDL is the maximum time a diver can stay at a given depth and still ascend directly to the surface with only a safety stop, without mandatory decompression stops.

Question 2

Which condition is caused by air entering the space between the lung and chest wall during a dive?

Accepted Answer

Pneumothorax

Answer

A pneumothorax occurs when air escapes into the pleural space, potentially collapsing a lung, and is a serious pulmonary barotrauma complication.

Question 3

When entering the water from a boat using a giant stride entry, which item should a diver check last before entering?

Accepted Answer

That the area below is clear of divers and obstacles

Answer

A diver must always confirm the entry zone is clear of other divers and hazards immediately before jumping to prevent collisions.

Question 4

What is 'thermocline' in the context of open water diving?

Accepted Answer

A sudden layer where water temperature drops significantly with depth

Answer

A thermocline is a distinct layer in the water where temperature drops sharply, which can affect buoyancy and surprise unprepared divers.

Question 5

How should a diver retrieve a dropped weight belt during a dive?

Accepted Answer

Descend slowly while equalizing and maintaining control

Answer

The diver should descend in a controlled manner, equalizing and monitoring buoyancy, just as during any planned descent.

Scuba Diving Practice Test

Scuba Diving Practice Test

Scuba Diving Open Water 4