To test yourself, take a piece of lined paper and write the numbers 1-12 in the margin. Answer each question with a letter A,B C or D. Check the answers when you are finished. Aim to get 10/12, or 83% BSAC Snorkel Diver SD4 Pressure, Breathing and Buoyancy 1. What is contained in body air spaces? A Blood B Water C Air D muscle 2. What happens to the volume of these air spaces as the outside pressure increases? A it increases B it decreases 3 In which part of the body are there NO air spaces? A Lungs B Ears and Sinuses C Intestines D Brain 4. What must you do to the air spaces within the skull to prevent injury and pain? A remove them B warm them C water them D equalise them 5. Is the air pressure in the lungs of a breath holding diver A greater than the outside water pressure B equal to the outside water pressure C smaller than the outside water pressure 6. Name the three parts of the ear A bones, skin, air B outer, middle, inner C outer, skin, air 7. Which part of the outer ear is normally in contact with the air? A Lobe B Eardrum C Ear canal D All of these 8. Can your ears be affected by the pressure at a depth of 2m eg at the deep end of a swimming pool? A Yes B No 9. When you clear your ears by pinching your nose which part of the ear is the air forced into? A Outer ear B Semicircular canals C Eustachian tube D Nostrils 10. Does it matter if you have a head cold when you are diving or snorkelling? A yes B No 11. What should you do if you experience pain in the sinuses when duck diving? A keep going B blow your nose C stop diving D call a doctor 12. Water pressure can force the mask against your face - called mask squeeze. What should you do if you are experiencing this discomfort? A Breathe out through the nose B Breathe in through the nose ��������������������������������������� Check your answers using lined paper a with question numbers 1-12 in the margin. Answer each question with A, B, C or D and again aim for 10/12 or 83% BSAC Snorkel Diver SD5 Safe Snorkelling 1. In which of the following ways is open water snorkelling different from the pool Open water has A salt water B tides C currents D all of these 2. What is most important for the snorkel diver's comfort and effort needed when swimming? A Warm water B Salt water C Fresh water D Buoyancy 3. What can you wear to give you extra buoyancy? 1. Lifejacket 2. Neoprene suit 3. Mask A 1 & 3 B 1 & 2 C 2 & 3 D 3 only 4. How will a snorkeller inflate a life jacket? A Using a bicycle pump B using a tank of air C by mouth 5. What other equipment can be used by a snorkeller as a buoyancy aid? A Boat B Surface marker buoy C Float D All of these 6. What name is given to the person who snorkels with you? A Pal B Buddy C Friend D Mate 7. Should you both dive at the same time? A Yes B No 8. What should the surface snorkeller look out for? A Passing ships B Other water users C any dangers D all of these 9. Which of these would be the best safety device to be taken when open water snorkelling A Surface Marker Buoy B Whistle C Flag D Chocolate 10. Why should protective clothing be worn? A To prevent cold B To prevent skin damage C To prevent sunburn D All of these 11 When snorkelling you should keep going until you are too cold to continue. A True B False 12 Should you try to collect a souvenir shell or a piece of coral from every dive? If YES - you have failed this test! If NO - why not? A All forms of marine life should be left in place B An empty shell could be a home for another marine animal C Conservation of the marine environment is important. D All of the above. |