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6. How many m of water exerts the same pressure as 1 ATA
7. When ascending, what is not a reason why the diver has to be careful?
- Blood shifts back from lungs to other places in the body
- PO2 could fall below level for consciousness
- Nitrogen could come out of blood too quickly
8. What is the most important factor that affects maximum breath hold time?
9. What is not an effect of nitrogen narcosis?
- Stupor
- Nervousness
- Unconsciousness
10. How is the pressure in the chamber brought back to normal?
- Doesn't matter
- Slowly
- Rapidly
11. The valsalva manoeuvre can be used to do what?
- Shift blood to resist lung collapse
- Equalise ear pressure to prevent rupture of eardrum
- Equalise pressure in mask
12. What law says that the total pressure of a mixture of gases is equal to the sum of pressures which each gas would exert if on their own?
- Ficks
- Hicks
- Daltons
- Henrys
13. Air is compressed to what in a SCUBA tank?
- 200 ATA
- 250 ATA
- 120 ATA
- 100 ATA
14. The pressure and volume of 1l of air at 30m is what?
- 4 ATA and 0.125l
- 3 ATA and 0.125l
- 4 ATA and 0.25l
- 3 ATA and 0.25l
15. 12l at 200 ATA is equivalent to what at 1 ATA?
16. Divers should not breathe in pure oxygen at depths more than what?
17. What law states that the greater the pressure, the more gas will dissolve into liquid?
18. Decompression sickness is more likely when?
- Ascending rapidly
- Ascending slowly
- Descending slowly
- Descending rapidly
19. What gas can be used to reduce risk of oxygen toxicity and nitrogen narcosis?
- Nitrogen
- Hydrogen
- Helium
- Carbon dioxide
20. Inspiring a gas with a PO2 of more that what increases chance of oxygen toxicity?
- 0.5 ATA
- 0.21 ATA
- 2 ATA
- 1 ATA