Exam

Question 1

1) If an object is neutrally buoyant (does not sink or float) in fresh water, the same object placed into salt water would

A sink.
B either sink or float.
C do nothing.
D float.

Answer 1

D. Float

Question 2

2) I blow up a balloon, tie it off, and take it to the bottom of the swimming pool. What will happen to the balloon and the air inside it?

A The balloon will get bigger and the air inside the balloon will be less dense (molecules move further apart).
B The balloon will get smaller and the air inside the balloon will be more dense (molecules move closer together).

Answer 2

B The balloon will get smaller and the air inside the balloon will be more dense (molecules move closer together).

As water pressure increases, the volume of an air space will decrease. This causes the density of the air inside to increase and air molecules are pushed closer together. The balloon would get smaller and the air density inside would be greater.

See Being a Diver I - Water Pressure and Air Volume

Question 3

3) I turn a glass upside down, trap the air in it by putting it in water, and then I take the glass down to 10 meters. The air space would

A become half the size it was at the surface.
B not change in size.
C become 1/3 the size it was at the surface.
D become 2/3 the size it was at the surface.

Answer 3

A become half the size it was at the surface.

Question 4

4) If I am not able to equalize (clear) my body air spaces, it may be because I have

A seasickness.
B heart disease and high blood pressure.
C a cold, allergy or another medical problem.
D anxiety.

Answer 4

C. Cold, allergy or another medical problem

Question 5

5) If my ears or sinuses hurt while I am descending (going down), it usually means

A my air spaces are equalized.
B my mask strap is too tight.
C I am feeling a squeeze and need to equalize.
D my mask is too small.

Answer 5

C I am feeling a squeeze and need to equalize.

Question 6

6) The best place for me to position an alternate air source is

A loose by my side so I can find it fast.
B in the triangle area formed by my chin and the lower corners of my rib cage.
C to the base of my cylinder.
D to the back of my BCD between my shoulder blades and waist.

Answer 6

B In the triangle area formed by my chin and the lower corners of my rib cage.

Question 7

7) Lung overexpansion injuries can be caused by

A scuba diving without a buddy.
B continuing a dive when not properly weighted.
C not drinking enough water before scuba diving.
D holding my breath while scuba diving.

Answer 7

D Holding my breath while scuba diving.

Blocking off your lungs by holding your breath and ascending could cause them to overexpand and rupture, which is a serious injury that could result in paralysis and death. Breathing continuously while scuba diving keeps air passages open allowing expanding air to escape.

Question 8

8) If my cylinder of air lasts 60 minutes while I am at the surface breathing normally, assuming all else is the same, how long will it last at 20 meters breathing normally?

A 60 minutes
B 20 minutes
C 15 minutes
D 12 minutes

Answer 8

B 20 minutes

Question 9

9) How often should I take my scuba cylinder to be visually inspected by my dive center?

A Once a year.
B Once every two years.
C Every six months.
D Every five years.

Answer 9

A Once a year.

Question 10

10) The difference between DIN valves and yoke valves is that DIN valves

A are made from durable plastic.
B contain a spring-operated shutoff valve that is held open by cylinder pressure.
C have an o-ring in them.
D have threaded openings to screw the regulator into.

Answer 10

D Have threaded openings to screw the regulator into.

Question 11

11) Which of the following is part of proper care for my scuba cylinder?

A Sand and repaint it every year.
B Dry it in the sun.
C Keep some air in it.
D Have it pressure tested every month.

Answer 11

C Keep some air in it.

Question 12

12) Refer to the regulator picture. Each regulator part has a number next to it. Please choose the correct number for the choices below.

regulator first stage,
regulator second stage
alternate air source second stage
low pressure inflator hose for the BCD
instrument console/gauges/computer

Answer 12

1. regulator first stage, 2. regulator second stage, 3. alternate air source second stage, 4. instrument console/gauges/computer.5. low pressure inflator hose for the BCD.

Question 13

13) When I look at things underwater they often seem ___________ than they look on the surface.

A larger and/or nearer
B larger and/or further away
C smaller and/or further away
D smaller and/or nearer

Answer 13

A. Larger and or nearer

Question 14

14) ___________ travels faster in water than it does in air. This is why you cannot easily tell where it comes from.

A Light
B Current
C Aquatic life
D Sound

Answer 14

D. Sound

Question 15

15) Unless there are laws that say differently, I should stay within ___________ of my dive flag.

A 60 meters
B 30 meters
C 15 meters
D 5 meters

Answer 15

C 15 meters

If there are no specific local laws regarding dive flags, stay within 15 meters of the flag. Boats should stay 30 to 60 meters away.

See Equipment III - Dive Flags

Question 16

16) If I work too hard and find it difficult to breathe underwater, I should

A inflate my BCD.
B stop all activity and rest, holding onto something for support if possible.
C swim immediately to my buddy and signal for help.
D do a controlled emergency swimming ascent (CESA - swimming up to the surface saying the ah-h-h-h sound).

Answer 16

B Stop all activity and rest, holding onto something for support if possible

Question 17

17) As I descend (go down), my wet suit will

A compress (feel thinner) from water pressure, and I will lose buoyancy and warmth.
B expand (feel thicker) from water pressure, and I will gain buoyancy and warmth.
C remain the same thickness from the water pressure, and there will be no change in warmth.
D expand (feel thicker) from water pressure, and I will lose buoyancy and warmth.

Answer 17

A Compress (feel thinner) from water pressure, and I will lose buoyancy and warmth.

Question 18

18) I know I am properly weighted for diving if I

A float at neck level with my BCD about half full while I am holding a normal breath of air.
B sink slowly holding a normal breath of air and with an empty BCD.
C float at eye level while holding a normal breath of air and with an empty BCD.
D sink easily with a partially filled BCD.

Answer 18

C Float at eye level while holding a normal breath of air and with an empty BCD

Question 19

28) I am most likely to become confused about which way is up or down _____________.

A at the surface
B near the surface
C on the bottom
D in midwater

Answer 19

D in midwater

Question 20

33) I am close to my buddy and realize I am out of air. The best response is to

A switch to my buddy’s alternate air source.
B make a controlled emergency swimming ascent (swim up to the surface making a continuous sound, like ah-h-h-h).
C make a buoyant emergency ascent (dropping my weight system).
D switch to my buddy’s alternate air source and continue the dive.

Answer 20

A switch to buddy’s air source

Question 21

34) If my regulator begins to free flow (release air continuously) while underwater, I should

A make a controlled emergency swimming ascent.
B do nothing special.
C hold the regulator without sealing my mouth around the mouthpiece and “sip” the air I need as I ascend (go up).
D make a buoyant emergency ascent.

Answer 21

C hold the reg without sealing mouth around mouthpiece sip air

Question 22

35) Although it shouldn’t have happened, on a dive I fail to watch my SPG and run out of air. If my buddy is close by, my best option is to __________. Another option is to _____________, if I’m in shallow water and the surface is closer than my buddy.
Note: you may have to scroll down to see the whole question or to submit your answer.

A ascend using my buddy’s alternate air source / make a controlled emergency swimming ascent
B ascend using my buddy’s alternate air source / make an buoyant emergency ascent
C make a normal ascent / ascend using my buddy’s alternate air source
D make a controlled emergency swimming ascent / make a normal ascent

Answer 22

A Ascend using my buddy’s alternate air source / make a controlled emergency swimming ascent

Question 23

36) There is an injured diver who is out of the water and is not responding to touch or my voice. The first thing to do would be

A to check if the diver is breathing.
B to keep the diver warm.
C to decide what happened.
D to provide oxygen.

Answer 23

A To check if the diver is breathing.

Your priority when assisting someone who is unresponsive is to make sure the diver is breathing. Provide rescue breaths as necessary. Contact emergency medical care.

See Being a Diver III - First Responder Care for Diving-Related Emergencies.

Question 24

37) I should have cylinders filled at a dive center I trust, not use air that tastes or smells bad, nor use air from a compressor designed to fill car tires. This is important to

A decrease the likelihood of gas narcosis.
B increase the enjoyment of my dive.
C reduce the risk of lung overexpansion injuries.
D reduce the risk of breathing contaminated air

Answer 24

D reduce the risk of breathing contaminated air

Question 25

38) Divers who act foolishly at depth due to gas narcosis may start acting normally again if they

A ascend (go up) to a shallower depth.
B breathe slowly and deeply.
C signal their buddy for help.
D dive within no stop limits.

Answer 25

A Ascend (go up) to a shallower depth.

Question 26

39) I am likely to increase the risk of decompression sickness (DCS) if I

A dive in poor visibility, strong moving water, and rough seas.
B dive while tired, cold, sick, thirsty or injured.
C do not look after my equipment.
D am using a dive computer.

Answer 26

B Dive while tired, cold, sick, thirsty or injured.