Allow us to breathe at appropriate pressure Pressure reduced in two stages – First stage attached to tank – Second stage attached to mouthpiece Extra hoses supply air to other equipment – buoyancy control devices, dry suits, etc.
1. The snorkel is designed to (b) permit breathing on surface The snorkel is used for breathing in a face-down position, on surface
Questions 2. Seeing through a mask is achieved by (a) placing a layer of air between eyes and water Our eyes see clearly in an air medium. Water must be kept out by the mask.
Questions 3. The mask should cover your nose to allow pressure equalisation
Questions 4. Basic equipment consists of (c) Mask / snorkel / fins
Questions 5. Which of the following items of equipment are essential? (a) & (c)
Questions 6. Wet suits are worn in cold water to keep a diver (c) They keep the diver warm by acting as insulation and by reducing the flow of cold water around the body
Questions 7. Wet suits are made of (b) Foam neoprene Foam neoprene: a rubber filled with neoprene gas bubbles which insulates the body from cold and is resistant to corrosion from oil, salt, and sun
Questions 8. Wet suits should be (c) Close fitting Close-fitting suits will slow down the flow of cold water thus keeping the diver warm and minimising heat loss
Questions 9. Dry suits will (b) keep you warmer than a wetsuit Generally, the dry suit will be warmer than the wetsuit because of the insulation worn next to the skin (provided that it does not leak).
Questions 10. Semi-dry suits have seals to keep (b) water in the suit Semi-dry suits have seals to retain water warmed by body heat.
Questions 11. A buoyancy device is (b) essential A buoyancy device is essential to divers and should be worn travelling to and from the dive site, as well as during the dive.
Questions 12. The buoyancy control device is designed (c) to maintain a face-up position on surface A properly-designed buoyancy device will provide a face- up position on surface, which may be required if a diver is tired or has had an accident.
Questions 13. The buoyancy device inner bladder should be sterilised regularly to (a) preserve internal hygiene Inside the buoyancy is warm and damp: an ideal breeding ground for germs.
Questions 14. The buoyancy device should be washed (b) immediately after use Wash often in fresh water: warm water if possible. This will prevent soft corrosion from the sea and chlorine corrosion from swimming pools.