Read each question carefully and select the best answer or fill in the blank, as appropriate for that question. For this exam you may use an non-programmable calculator and a scratch piece of paper.
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Question 1 of 11
1. Question
The unprotected human body loses heat approximately _________ times faster in water than in air.
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Question 2 of 11
2. Question
Refraction causes objects underwater to be magnified approximately:
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Question 3 of 11
3. Question
Underwater, turbidity can cause objects to look farther away than they really are, a phenomenon called:
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Question 4 of 11
4. Question
Sound travels approximately how many times faster in water than in air?
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Question 5 of 11
5. Question
Underwater, most sounds seem to come from:
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Question 6 of 11
6. Question
An object weighs 100kg and displaces 100 litres of water. Disregarding the minimal displacement of the lead, how much lead weight do you need to make it 20kg negatively buoyant in sea water? (Round to the closest kg)
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Question 7 of 11
7. Question
An object weighs 237kg and displaces 123 litres of water. How much additional sea water do you need to displace to give the object 40kg positive buoyancy? (Round to the closest litre)
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Question 8 of 11
8. Question
What is the absolute pressure in ata at 26m in fresh water? (Round to one decimal place)
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Question 9 of 11
9. Question
You take a gas volume of 2 litres in a flexible container from the surface to a depth of 17m in sea water. What will the new volume be? (Round to one decimal place)
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Question 10 of 11
10. Question
and what will the density be compared to the surface (Round to one decimal place)
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Question 11 of 11
11. Question
You take 3.5 litres of a gas in a flexible container from 32m in fresh water to 22m. What will be the new volume? (Round to one decimal place)
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