QUESTIONS AND ANSWERS ALREADY GRADED A
1) When 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 sinks or floats.
C do nothing. D float.
D
2) I blow up a balloon, tie it off, and take it to the bottom of the swimming
pool. Identify 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). C The balloon will get bigger and the
air inside the balloon will be more dense.
D The balloon will get smaller and the air inside the balloon will be less dense.
B
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,3) I turn a glass upside down, trap the air by putÝng it in water, and then take
it down to 10 meters. The air space would
A became half the size it was at the surface.
B does not change in size.
C becomes 1/3 the size it was at the surface.
D becomes 2/3 the size it was at the surface.
A
4) when 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.
C
5) If my ears or sinuses hurt while I am descending (going down), it usually
means
a My air spaces are equalized.
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, B my mask strap is too tight.
C I am feeling a squeeze and need to equalize.
D my mask is too small.
C
6) which is 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.
B
7) what can cause Lung overexpansion injuries
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.
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