This sample test is from the Open Water certification exam.

Select the button next to the answer of your choice. If you make a mistake you can change it at any time before hitting the submit button. When you hit the submit button your quiz will be graded.

	1. If a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may require cleaning by a process called: Stripping Tumbling Grinding Sand blasting
	2. Green discoloration on the first stage of a scuba regulator indicates: Corrosion from a steel cylinder. Carbon graphite dust from the scuba air compressor. Water has most likely entered the first stage. None of the above.
	3. Two benefits derived from using an electronic dive computer are: Unlimited dive time and water temperature display. Accurate monitoring of ascent rate and, if executing a multi-level diving profile, avoidance of the maximum time/depth penalty. They always prevent DCS and sound off when ascent rate is exceeded. Unreliable time and depth information.
	4. To help avoid injury when diving in an unknown location, divers should: Receive a formal orientation from a diving professional familiar with the area. Wear an exposure suit appropriate for the area. Use a diver propulsion vehicle. Use a special cave diving light.
	5. Scyphozoans, or true jellyfish, possess stinking cells within their tentacles called: Cilica Thorns Barbs Nematocysts
	6. Archimedes' Principle states that "an object partially or wholly immersed in a fluid is buoyed up by a force equal to the ______________ of the ____________ displaced by that object". type; air weight; atmosphere weight; fluid particles; sediment
	7. If a cylinder contains 80 cubic feet of air at a pressure of 3000 psig, approximately how many cubic feet of air remains in the cylinder at a pressure of 2200 psig if the cylinder temperature remains constant? 52.6 cubic feet 58.6 cubic feet 68.6 cubic feet 50.6 cubic feet
	8. The onset of nitrogen narcosis is characterized by: A clear thought process. Impairment of thought. The inability to sense pleasure. Increased precision in motor skill function.
	9. Smoking cigarettes affects a diver in which of the following ways? Increases the level of carbon monoxide in the blood. Increases tolerance for exercise. Lowers the number of beats per minute of the heart. Provide greater resistance to decompression sickness.
	10. The recommended maximum rate of ascent for recreational scuba diving is _____ feet per minute. 60 45 30 65