PADI Diving Theory & Safety

Question 1

What is the primary reason for performing a pre-dive safety check?

Accepted Answer

Ensure equipment functions and dive safety

Answer

A pre-dive safety check, often called a BWRAF check, is critical for verifying that all diving equipment is correctly assembled, functioning properly, and ready for use. This systematic inspection helps identify potential malfunctions or errors before entering the water, significantly reducing the risk of equipment-related incidents. It is a fundamental step in responsible diving, ensuring the diver's safety throughout the dive.

Question 2

What does Boyle’s Law describe in diving?

Accepted Answer

Pressure and gas volume inversely related

Answer

Boyle's Law states that for a fixed amount of gas at constant temperature, the pressure and volume are inversely proportional. In diving, this means that as a diver descends, the ambient pressure increases, causing the volume of air in their lungs and other body air spaces to decrease. Conversely, during ascent, pressure decreases and gas volume expands, which is crucial for understanding equalization and safe ascent rates to prevent barotrauma.

Question 3

Why is slow ascent important during a dive?

Accepted Answer

Prevent decompression sickness

Answer

Slow ascent is vital in diving to allow the nitrogen gas, absorbed into the diver's tissues under pressure, to be safely released from the body through breathing. Ascending too quickly causes the external pressure to drop rapidly, leading to the nitrogen forming bubbles in the blood and tissues, which is known as decompression sickness (DCS). A controlled ascent rate, often guided by a dive computer, minimizes this risk.

Question 4

What is the function of a dive computer?

Accepted Answer

Track depth, time, and decompression

Answer

A dive computer is an essential piece of safety equipment that continuously monitors a diver's depth and bottom time. Based on this data, it calculates the amount of nitrogen absorbed and released by the body, providing real-time information on no-decompression limits and required safety stops. This helps divers stay within safe limits and significantly reduces the risk of decompression sickness.

Question 5

What is the recommended safety stop depth and duration?

Accepted Answer

15 feet for 3-5 minutes

Answer

The recommended safety stop depth and duration is typically 15 feet (5 meters) for 3-5 minutes. This shallow stop allows for additional off-gassing of nitrogen from the diver's tissues at a reduced pressure, further minimizing the risk of decompression sickness. It provides an extra margin of safety, especially after deeper or longer dives, before surfacing completely.

(PADI) Certified Professional Association of Diving Instructors Diver Practice Test

(PADI) Certified Professional Association of Diving Instructors Diver Practice Test

PADI Diving Theory & Safety