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6. How many m of water exerts the same pressure as 1 ATA

  • 10m
  • 1m
  • 20m
  • 5m

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?

  • High CO2
  • Low O2

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?

  • 6000l
  • 2400l
  • 3000l
  • 2000l

16. Divers should not breathe in pure oxygen at depths more than what?

  • 7m
  • 2m
  • 5m
  • 10m

17. What law states that the greater the pressure, the more gas will dissolve into liquid?

  • Fick
  • Henry
  • Boyles
  • Dalton

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