Scuba Diving Scuba Diving Equipment 2 — Questions and Answers
Question 1: What is a dive knife primarily used for in scuba diving?
- Cutting entangling lines or nets (Correct answer)
- Hunting fish underwater
- Prying open shellfish
- Digging in the sand
Correct answer: Cutting entangling lines or nets
A dive knife is a safety tool primarily carried to cut through fishing line, kelp, or nets if a diver becomes entangled.
Question 2: Which type of fin style allows divers to wear thick booties and provides more thrust?
- Open-heel fins (Correct answer)
- Full-foot fins
- Split fins
- Paddle fins
Correct answer: Open-heel fins
Open-heel fins have an adjustable strap and a larger foot pocket, making them compatible with thick neoprene booties for cold water.
Question 3: What is a dive computer's primary role?
- Track depth and time to calculate no-decompression limits (Correct answer)
- Navigate underwater using GPS
- Communicate with the surface
- Control BCD inflation automatically
Correct answer: Track depth and time to calculate no-decompression limits
A dive computer continuously monitors depth and bottom time to calculate remaining no-decompression limits and safe ascent profiles.
Question 4: What does a dry suit use to keep a diver warm?
- Air or argon trapped inside the suit (Correct answer)
- A heated water layer
- Thick neoprene foam
- Chemical heating packs
Correct answer: Air or argon trapped inside the suit
A dry suit seals out water entirely and uses an insulating gas layer (air or argon) inside the suit to provide thermal protection.
Question 5: What is the purpose of a scuba mask purge valve?
- Clear water from the mask without removing it (Correct answer)
- Equalize ear pressure
- Release excess regulator pressure
- Vent CO2 from exhaled air
Correct answer: Clear water from the mask without removing it
A purge valve on a mask allows divers to exhale through the nose to push out any water that has flooded the mask.
Question 6: What is a surface marker buoy (SMB) used for?
- Signal divers' location to boats at the surface (Correct answer)
- Mark an underwater hazard
- Float spare equipment to the surface
- Measure visibility underwater
Correct answer: Signal divers' location to boats at the surface
An SMB is an inflatable tube deployed at the end of a dive to mark a diver's ascent position and alert boats overhead.
Scuba Diving Scuba Diving Equipment 2
What is a dive knife primarily used for in scuba diving?