SSI Assistant Instructor Pre Test Questions with Correct Answers

Assuming a maximum partial pressure limitation of 1.4 bar, the maximum depth for a 32% nitrox mixture is ____ of seawater. 33.7 m 20 m 66 m 43.7 m Correct Answer 33.7 m Which physical law states: "If temperature remains constant, the pressure and volume of any gas are inversely related"? Dalton Henry Archimedes Boyle Save Correct Answer Boyle For every meter of depth in freshwater, pressure changes by: 0.013 bar 0.098 bar 0.100 bar 1.03 bar Correct Answer 0.098 bar diver and his / her equipment weigh 87 kg when neutrally buoyant in saltwater. To be neutrally buoyant for freshwater diving with the same equipment, he /she has to: Add weight All answers are correct Use the same weight Remove weight Correct Answer Remove weight If 2 liters of air are needed in your buoyancy compensator to maintain neutral buoyancy at 10m in the ocean, what will happen to your buoyancy if you ascend 3 m without deflating: Your positive buoyancy will increase There will be no change in buoyancy Your negative buoyancy will increase You will stay neutral no matter if you ascend or descend Correct Answer Your positive buoyancy will increase Breathing gas consumption: Varies inversely with depth Increases as depth increases Decreases as depth increases Remains the same as depth increases Correct Answer Increases as depth increases The ocean depth at which the partial pressure of oxygen in air equals 1.6 bar is _____ meters assuming O2 = 21%. 70 85 66 55 Correct Answer 66 Assuming a maximum partial pressure limitation of 1.4 bar, the maximum MOD for a 40% nitrox mixture in the ocean is: 35 meters 25 meters 40 meters 20 meters Correct Answer 25 meters The absolute pressure at a depth of 50 meters in salt water is: 5.012 bar 6.000 bar 5.000 bar 5.901 bar Correct Answer 6.000 bar What would be the surface air consumption rate (SAC) of a diver with a 200bar, 10 liter cylinder who uses 50bar in 10 minutes at a depth of 10 meters in the ocean? 25 liters / minute 50 liters / minute 35 liters / minute 10 liters / minute Correct Answer 25 liters / minute If you have difficulty equalizing pressure in your ears/sinuses while descending, you should: Ascend 2 meters and force equalization Stop and wait until the discomfort subsides Ascend until the pressure is relieved and then attempt equalization Return to the surface and re-initiate the descent Correct Answer Ascend until the pressure is relieved and then attempt equalization A lung rupture can occur with over-pressurization in water as shallow as: 5.0m 1.2m 3.5m 4.0m Correct Answer 1.2m The recommended method to avoid sinus squeezes and reverse blocks is to: Ascend and descend slowly to allow gradual equalization Dive only when your sinuses are healthy and clear