Exam Questions And Correct Answers Verified

Association of Diving Contractors International (ADCI) Entry-Level Diver Certification Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of a dive plan?
• To schedule divers’ breaks
• To ensure the diver has the right equipment
• To establish procedures for a safe dive
• To record underwater wildlife sightings

Rationale: A dive plan is essential for outlining safe procedures, emergency

protocols, and operational guidelines for divers.

• What is the maximum recommended working depth for a diver using

standard air in recreational diving?

• 30 feet
• 60 feet 1 / 4

• 130 feet
• 200 feet

Rationale: Recreational divers are generally limited to 130 feet (40 meters)

using air to avoid nitrogen narcosis and decompression sickness.

• Which piece of equipment is used to measure depth underwater?
• Regulator
• Buoyancy compensator
• Depth gauge
• Dive knife

Rationale: A depth gauge measures how deep a diver is, which is critical

for avoiding decompression issues.

• What is the purpose of a dive buddy?
• To help carry equipment
• To assist and monitor for safety underwater
• To take photographs
• To enforce dive limits

Rationale: A dive buddy helps monitor the diver’s condition, assist in

emergencies, and enhance overall safety.

• Which gas is commonly used for breathing in surface-supplied

commercial diving?

• Helium
• Nitrogen 2 / 4

• Air
• Oxygen only

Rationale: Standard surface-supplied commercial diving uses compressed

air as the breathing gas, unless specialized mixes are required.

• What is the primary cause of decompression sickness?
• Low oxygen
• Rapid ascent causing dissolved nitrogen to form bubbles
• Cold water immersion
• High carbon dioxide levels

Rationale: Decompression sickness occurs when dissolved nitrogen comes

out of solution too quickly during ascent.

• Which of the following is a symptom of nitrogen narcosis?
• Excessive shivering
• Impaired judgment and euphoria
• Muscle cramps
• Skin rashes

Rationale: Nitrogen narcosis affects the nervous system, causing altered

judgment and a sense of euphoria.

• Before entering the water, what is the first check a diver should

perform?

• Weight belt tightness
• Buddy check and equipment inspection 3 / 4

• Water temperature
• Air consumption rate

Rationale: A thorough buddy check ensures all equipment is functioning

and the diver is ready for a safe dive.

• Which part of the dive helmet supplies breathing gas to the diver?
• Faceplate
• Gas supply hose
• Communications unit
• Neck dam

Rationale: The gas supply hose delivers breathing gas from the surface to

the diver’s helmet.

• What is the function of a dive knife?
• Signaling
• Cutting entanglements
• Measuring depth
• Controlling buoyancy

Rationale: A dive knife is a safety tool used to cut lines, nets, or other

entanglements underwater.

• How often should a commercial diver have a medical

examination?

• Every 10 years
• Every 5 years
• / 4