Focus On Physical Science: California Grade 8

Chapter 3: Densityand Buoyancy

Standard Assessment

1.
A rectangular solid is a cube with each side measuring 10 cm. What is the volume of the cube? 8.b
A)100 cubic cm
B)1,000 cubic cm
C)10 cubic cm
D)1 cubic cm
2.
When you observe a physical property, the substance __________. 8.a
A)burns
B)changes
C)does not change
D)melts
3.
Mass and volume depend on the __________ of matter present. 8.a
A)flammability
B)chemical properties
C)physical properties
D)amount
4.
Pressure ________ as one goes deeper under water. 8.c
A)does not exist
B)decreases
C)stays the same
D)increases
5.
Which of these is the correct formula to find density? 8.b
A)Density = mass/Volume
B)Density = mass x Volume
C)Density = Volume/mass
D)Density = Volume + mass
6.
Which best describes particles in a liquid? 8.c
A)more freely moving than a solid
B)less freely moving than a solid
C)more freely moving than a gas
D)completely unmoving
7.
Because lead has a lower density than liquid mercury, it will __________ in mercury. 8.c
A)sink
B)float
C)dissolve
D)melt
8.
Air exerts pressure because it has __________. 8.c
A)space
B)size
C)weight
D)height
9.
Objects can float in which of the following? 8.d
A)solids, liquids, and gases
B)solids only
C)liquids only
D)both liquids and gases
10.
The force exerted on an area is known as __________. 8.c
A)volume
B)specific heat
C)temperature
D)pressure
11.
The density of an object depends on which of the following? 8.a
A)the length of the object
B)the amount of the object present
C)the material that makes up the object
D)the number of objects
12.
A helium balloon will eventually sink when _______. 8.d
A)the balloon's density becomes less than the density of the air.
B)the balloon's density becomes greater than the density of the air.
C)the balloon's density is equal to the density of the air.
D)the balloon reaches outer space.
13.
A boat floats on water because _______. 8.d
A)the boat's downward weight is greater than the buoyant upward force
B)the boat's downward weight is balanced by the buoyant upward force
C)the boat's downward weight is less than the buoyant upward force
D)the boat's downward weight has nothing to do with the buoyant upward force
14.
What causes a buoyant force? 8.c
A)the force of the liquid pushing up an object
B)the force of the air on the liquid's surface
C)the hydraulic pressure of the system
D)the volume of fluid
15.
The density of a material depends on ________. 8.a
A)the mass of the particles and distance between the particles.
B)the mass of the particles only
C)the distance between the particles only
D)neither mass nor distance between particles
16.
A rock sinks in water because _______. 8.d
A)the rock's downward weight is balanced by the buoyant upward force
B)the rock's downward weight is greater than the buoyant upward force
C)the rock's downward weight is less than the buoyant upward force
D)the rock's downward weight has nothing to do with the buoyant upward force
17.
A hydrometer measures the ________ of a liquid. 8.d
A)volume
B)density
C)mass
D)height
18.
What does density measure? 8.a
A)weight per unit matter
B)volume per unit mass
C)mass per unit volume
D)matter per unit weight
19.
It is possible to make a boat that will float, if the boat is made of which of these materials? 8.d
A)metal only
B)wood only
C)wood or metal
D)neither wood nor metal
20.
What best explains how a straw works? 8.c
A)The atmospheric pressure pushes down on the liquid's surface..
B)Your mouth sucks liquid in.
C)The atmospheric pressure in your mouth pushes down on the liquid.
D)The suction in your mouth is equal to atmospheric pressure.
Grade 8
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