PADI QUIZ 1A QUESTIONS AND
ANSWERS
1. Something underwater that does not float and does not
sink is ___________.**
A. Positively buoyant
B. Negatively buoyant
C. **Neutrally buoyant**
D. Densely buoyant
Answer C. Neutrally buoyant**
**Explanation:** According to Archimedes' Principle,
buoyancy depends on displacement. **Positive** means it
floats, **Negative** means it sinks. **Neutrally buoyant**
means the weight of the object is equal to the weight of
the water it displaces, so it neither sinks nor floats. This is
the goal for a diver underwater.
, **2. If an object is neutrally buoyant in salt water, what
will probably happen to the object if you put it into fresh
water?**
A. It will float - become positively buoyant
B. **It will sink - become negatively buoyant**
C. It will remain neutrally buoyant
D. It will become lighter
Answer B. It will sink - become negatively buoyant**
**Explanation:** Salt water is denser/heavier than fresh
water because of dissolved salt - 1 cubic foot of salt water
weighs more than 1 cubic foot of fresh water. An object
that is neutral in dense salt water displaces less fresh
water weight, so it doesn't have enough support and
becomes negatively buoyant and sinks. You need less
weight in fresh water than in salt water.
ANSWERS
1. Something underwater that does not float and does not
sink is ___________.**
A. Positively buoyant
B. Negatively buoyant
C. **Neutrally buoyant**
D. Densely buoyant
Answer C. Neutrally buoyant**
**Explanation:** According to Archimedes' Principle,
buoyancy depends on displacement. **Positive** means it
floats, **Negative** means it sinks. **Neutrally buoyant**
means the weight of the object is equal to the weight of
the water it displaces, so it neither sinks nor floats. This is
the goal for a diver underwater.
, **2. If an object is neutrally buoyant in salt water, what
will probably happen to the object if you put it into fresh
water?**
A. It will float - become positively buoyant
B. **It will sink - become negatively buoyant**
C. It will remain neutrally buoyant
D. It will become lighter
Answer B. It will sink - become negatively buoyant**
**Explanation:** Salt water is denser/heavier than fresh
water because of dissolved salt - 1 cubic foot of salt water
weighs more than 1 cubic foot of fresh water. An object
that is neutral in dense salt water displaces less fresh
water weight, so it doesn't have enough support and
becomes negatively buoyant and sinks. You need less
weight in fresh water than in salt water.
