PADI - Professional Association of Diving Instructors The Aquatic Environment Questions and Answers

Question 1

While descending on a dive in a temperate ocean, you pass through a shimmering, blurry layer of water and suddenly feel a distinct drop in temperature. What is this phenomenon called?

Accepted Answer

A thermocline

Answer

A halocline

Answer

An upwelling

Answer

A pycnocline

Question 2

You are planning a dive from an anchored boat in an area known to have a consistent, moderate current. To manage your dive effectively and conserve energy, what is the generally recommended procedure?

Accepted Answer

Begin the dive by swimming against the current for the first portion, and return to the anchor line with the current's assistance.

Answer

Conduct a drift dive and have the boat follow your surface marker buoy.

Answer

Descend and immediately swim with the current for the first half of the dive.

Answer

Swim perpendicular to the current to cover the most area before returning.

Question 3

As a diver descends, water selectively absorbs wavelengths of light. Which of the following colors is the first to be absorbed and, as a result, will appear gray or black at the shallowest depth?

Accepted Answer

Red

Answer

Blue

Answer

Green

Answer

Yellow

Question 4

A diver is perfectly weighted to be neutrally buoyant in the ocean. If this diver uses the exact same equipment configuration for a dive in a freshwater quarry, how will their buoyancy be affected?

Accepted Answer

They will be negatively buoyant and need to remove weight.

Answer

They will be positively buoyant and need to add weight.

Answer

Their buoyancy will not change between saltwater and freshwater.

Answer

They will be neutrally buoyant but require more air in their BCD.

Question 5

Why is it very difficult for a diver to determine the direction of a sound, such as a boat engine, while underwater?

Accepted Answer

Because sound travels much faster in water than in air, reaching both ears at almost the same time.

Answer

Because water pressure impairs the function of the inner ear.

Answer

Because low-frequency sounds are filtered out by the water, removing directional cues.

Answer

Because the dive hood significantly muffles and distorts incoming sound waves.

Question 6

Which of the following actions is a key principle of responsible and passive interaction with aquatic life, as promoted by PADI Project AWARE?

Accepted Answer

Maintaining neutral buoyancy to avoid contact with the bottom and delicate organisms.

Answer

Feeding small fish to attract them for better photo opportunities.

Answer

Wearing gloves to allow for gently touching certain types of marine creatures.

Answer

Using a small probe to gently move marine life for a better view.

While descending on a dive in a temperate ocean, you pass through a shimmering, blurry layer of water and suddenly feel a distinct drop in temperature.What is this phenomenon called?

While descending on a dive in a temperate ocean, you pass through a shimmering, blurry layer of water and suddenly feel a distinct drop in temperature.
What is this phenomenon called?