| 1. | The unprotected human body loses heat approximately _____ times faster in water than in air
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| a. | | 8 |
| b. | | 10 |
| c. | | 16 |
| d. | | 20
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| 2. | Refraction causes objects underwater to be magnified approximately
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| a. | | 16% |
| b. | | 25% |
| c. | | 33% |
| d. | | 50%
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| 3. | 4. Sound travels approximately ________ time faster in water than in air? |
| a. | | one |
| b. | | two |
| c. | | three |
| d. | | four
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| 4. | Underwater, most sounds seem to come from:
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| a. | | ahead |
| b. | | behind |
| c. | | side of your dominant ear |
| d. | | overhead
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| 5. | For a given percentage of gas in a mix of breathing gases, as depth increases, the physiological effect of that gas will
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| a. | | increase |
| b. | | decrease |
| c. | | remain unchanged |
| d. | | increase or decrease depending on the gas
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| 6. | When you raise the pressure of a gas in contact with a liquid
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| a. | | Liquid can hold more dissolved gas |
| b. | | There is no change in dissolved gas the liquid can hold |
| c. | | Dissolved gas tension decreases |
| d. | | The Dissolved gas surface tension inverts.
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| 7. | Super saturation is the state when
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| a. | | Pressure of a dissolved gas in a liquid equals the pressure of a gas in contact with the liquid |
| b. | | The pressure of a dissolved gas in a liquid exceeds the pressure of the gas in contact with the liquid. |
| c. | | Bubbles dissolve in a liquid due to an increase in pressure |
| d. | | None of the above
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| 8. | Water dissipates body heat faster than air does because
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| a. | | Water molecules are more dense, creating more efficient conduction |
| b. | | Water pressure inhibits molecular motion keeping it colder than air |
| c. | | It has a lower heat capacity |
| d. | | All of the above
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| 9. | Objects in the water are magnified due to:
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| a. | | Refraction |
| b. | | Visual inversion |
| c. | | Wider at the base than they are/ |
| d. | | All of the above
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| 10. | The body responds to the ______ of a gas you breath, not the ________.
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| a. | | Percentage/ Partial pressure of a gas mixture |
| b. | | Partial pressure/ Percentage in the gas mixture |
| c. | | Density/viscosity |
| d. | | Viscosity/ Density
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| 11. | For a given percentage of gas in a mix of breathing gases, as the depth decrease, the physiological effect of that gas will
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| a. | | increase |
| b. | | decrease |
| c. | | remain unchanged |
| d. | | increase/decrease depending on the gas
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| 12. | When you raise the pressure of a gas in contact with a liquid
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| a. | | Liquid evaporates |
| b. | | Gas forms bubbles in the liquid |
| c. | | The liquid dissolves into the gas |
| d. | | The gas dissolves into the liquid
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| 13. | If the pressure in contact with a liquid is reduced enough to cause excessive supersaturation |
| a. | | The liquid can no longer hold the gas |
| b. | | Bubbles may form |
| c. | | The dissolved gas will eventually reach equilibrium with the new pressure |
| d. | | All of the above
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| 14. | How much faster does water dissipate heat? |
| a. | | 5 |
| b. | | 10 |
| c. | | 20 |
| d. | | 40
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| 15. | Refraction magnifies objects by how much? |
| a. | | 10% |
| b. | | 4:3 or 33% |
| c. | | 5:2 |
| d. | | 100%
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| 16. | Bradycardia reduces circulation speed, it is: |
| a. | | the slowing of the heart |
| b. | | the speeding up of the heart |
| c. | | slowing of breathing |
| d. | | speeding up of breathing
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| 17. | Shallow water blackout is caused by hyperventilation reducing CO2 levels eliminating the breathing reflex. |
| a. | | True |
| b. | | False
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| 18. | Hypocapnia is insufficient carbon dioxide, caused by hyper ventilation, and can result in shallow water blackout. |
| a. | | True |
| b. | | False
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| 19. | Shallow water blackout only occurs at shallow water as the partial pressure of oxygen is lower. |
| a. | | true |
| b. | | false
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| 20. | How much does 5 cubic feet of water weigh? |
| a. | | 320 lbs |
| b. | | 360 Kg |
| c. | | 330 Kg |
| d. | | 340 lbs
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| 21. | A 175 kilogram/385 pound anchor that displaces 115 litres/4 cubic feet of water lies on the bottom in 14 metres/46 feet of salt water. What is the minimum amount of water that must be displaced from a lifting device to bring the anchor to the surface? |
| a. | | 54.9 litres/2 cubic feet |
| b. | | 60 litres/2.16 cubic feet |
| c. | | 65 litres/2.34 cubic feet |
| d. | | 110 litres/4 cubic feet
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