You should not dive when:

• You are congested.
  
• You are feeling unwell.
• Your mind is impaired.
• All of them.

The three main types of BCs are ________, ________, and ________.

• back flotation, vest style, and horseshoe rings.
• horse collars, life preserver rings,  and inflatable rafts.
• water wings, ankle pillows, and waist rings.
• jacket style, back flotation, and horse collars.

The two types of metal used to make scuba cylinders are

• Chrome and Copper
• Aluminum and Iron
• Steel and Silver
• Aluminum and Steel
  

A Scuba cylinder should be filled with:

• Filtered  air only
• Nitrogen, oxygen, carbon dDioxide
• Pure oxygen only
• Helium, oxygen and filtered air

Scuba cylinders must have hydrostatic testing done a minimum of every ________ years.

• 5 years
• 2 years
• 4 years
• year

Scuba cylinders need to be visually inspected internally at least every ________. 

• 5 years
• 2 years
• year
• 10 years

A _________ calculates your remaining allowable bottom time while diving.

• secret diver technology
• submersible calculator
• SCUBA watch
• dive computer and / or submersible pressure gage

Proper maintenance of instruments includes ________ and ________.

• rinsing after each diving day, having them serviced once per year
  
• dish soap, filtered water rinses.
• oil checks, visual inspections.
• visual inspections, and certified inspections.

The three main types of BCs are ________, ________, and ________.

• vest style, water wings, and horseshoe waist belt. 
• back floatation, life jacket style, and weight belt.
• jacket style, back flotation, and horse collars.
• safety ring, jacket style, and horse collars.

Why should you rinse the inside of your BC?

• So it's not sticky next time you use it.
• To remove salt crystals and to prevent damage to the inside of your BC.
• So it will stay soft and pliable.
• To make sure little animals that got in there are re-released into the water.