Density and Buoyancy Practice Test
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1.
Density depends on ____.
a. weight
c. mass and volume
b. mass
d. volume
____
2.
A cork is able to float on water because it is ____.
a. a crystalline solid
c. small in size
b. equal in density to water
d. less dense than the water
Figure 3
____
3.
In which direction does the pressure exerted by the water push on the sphere in Figure 3?
a. upward
c. to the side
b. downward
d. in all directions
____ 4.
most dense?
The figures below show four different arrangements of the same type of atom. Which is the
a.
c.
b.
d.
____ 5.
Which is the upward force on an swimmer that balances the downward force of gravity and
keeps the swimmer from sinking?
a. atmospheric pressure
c. density
b. buoyant force
d. pascal
____ 6.
Vashti has a balloon filled with air. When she places it on the surface of a pond, the balloon
floats. What would happen to the balloon if Vashti filled the balloon with sand and then placed it on the
pond’s surface?
a. The balloon would sink.
c. The balloon would float in the air.
b. The balloon would burst.
d. The balloon would float in the water.
____ 7.
If an object weighing 50 N displaces a volume of water with a weight of 10 N, what is the
buoyant force on the object?
a. 60 N
c. 40 N
b. 50 N
d. 10 N
____
8.
Of the following, where would atmospheric pressure be greatest?
a. at sea level
c. at the altitude at which planes fly
b. on a mountaintop
d. at the outer edge of the atmosphere
____ 9.
An object that weighs 2 N displaces 250 mL of water, which weighs 2.5 N. What is the
buoyant force on the object? Will it sink or float?
a. 2.5 N and it will float
c. 2 N and it will float
b. 2.5 N and it will sink
d. 2 N and it will sink
____
10.
An object sinks when it displaces a volume of liquid that has a weight
a. less than the object's weight.
c. more than the object's weight.
b. equal to the object's weight.
d. None of the above
____
11.
What is the density of a 20 cm3 sample of liquid with a mass of 25 g?
a. 0.8 g/cm3
c. 45 g/cm3
b. 1.25 g/cm3
d. 500 g/cm3
____
12.
If a rock displaces 5 ml of water, it means the volume of the rock is
a. 5 cm3.
c. 5,000 mL.
b. 5 g.
d. 5,000 cm3.
____ 13.
Steel is almost eight times more dense than water. A steel ship can float in water instead of
sink because of its
a. mass.
c. shape.
b. weight.
d. density.
____
14.
Because density is mass per unit volume, an increase in a steel ship's
a. mass leads to a decrease in its density.
b. volume leads to a decrease in its density.
c. volume leads to an increase in its density.
d. density is caused by an increase in its volume.
____
its
15.
A submarine can travel both on the surface of the water and underwater because it can change
a. interior pressure.
c. density.
b. gravitational force.
d. volume.
____
16.
You do not notice atmospheric pressure on your body because
a. it is air.
b. atmospheric pressure acts evenly on your body.
c. of gravity.
d. the fluids inside your body also exert pressure.
____
17.
Air pressure decreases as
a. velocity increases.
b. elevation increases.
c. acceleration decreases.
d. gravity increases.
____
18.
Which of the following is true of the buoyant force?
a. It acts in the downward direction.
b. It acts with the force of gravity.
c. It acts in the upward direction.
d. It makes an object feel heavier.
____
19.
The mass per unit volume of a substance is its
a. density.
b. buoyancy.
c. weight.
d. fluid pressure.
Density and Buoyancy Practice Test
Answer Section
MULTIPLE CHOICE
1.
ANS: C
PTS:
1
2.
ANS: D
PTS:
1
3.
ANS: D
Feedback
A
That's one direction, but pressure is exerted in other directions too.
B
Does a fluid only exert pressure in one direction?
C
You're on the right track.
D
Correct!
PTS:
1
4.
ANS: B
Feedback
A
Try again.
B
In the least dense material, would the atoms be closest together or farthest apart?
C
That's right!
D
PTS:
Look back at Chapter 3, Lesson 1 for help.
1
5.
ANS: B
Feedback
A
In which direction does atmospheric pressure push?
B
Right!
C
Is density a force?
D
Try again.
PTS:
1
6.
ANS: A
Feedback
A
That's correct!
B
Try again.
C
Is sand more dense or less dense than air?
D
Is sand more dense or less dense than water?