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* 1. If you begin your dive with 210 bar of gas in your cylinder, what is the minimum amount of gas (in bar) you should plan to have left on reaching the surface at the end of your dive?

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* 2. Which surface breathing rate should you use when calculating the amount of gas required for a dive?

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* 3. Which of the following can increase breathing rates?

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* 4. Your surface breathing rate is 20 litres per minute. How much breathing gas (in litres) is required for a dive to 30 metres for 20 minutes? 

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* 5. You plan to dive to 28 metres for 22 minutes with a surface breathing rate of 25 litres per minute. You have a choice of 10L, 12L, 12.5L, and 15L cylinders each filled to 220 bar. Which is the smallest cylinder that contains enough gas for the dive?

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* 6. What breathing rate (expressed as litres per minute at the surface) are you advised to expect during the initial phases of an emergency?

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* 7. How long (in minutes) would the gas in a 3L cylinder filled to 200 bar last in an emergency at 30 metres if the user's breathing rate (surface) was 50 litres per minute?

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* 8. Which of the following AS configurations protects the wearer completely against 1st stage failure? Please select all that apply.

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* 9. Which of the following AS configurations leaves both divers breathing from the same cylinder when it's in use? Please select all that apply.

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* 10. What sort of regulator second stage is suitable for use as an octopus?

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* 11. What sort of first stage is required for use with an octopus system?

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