Test Booklet
Subject: SC, Grade: 08
CST 8th Grade Science
Student name:
Author: California
District: California Released Tests
Printed: Tuesday January 14, 2014
CST 8th Grade Science
1 The graph below shows the movement of an object
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2 Data from an experiment are presented below.
at several points in time.
The slope of the graph represents what characteristic of an object?
What is the average speed of the object?
A
B
C
D
0.5meters
minute
2meters
minute
25meters
minute
50meters
minute
A
B
C
D
displacement
force
speed
inertia
3 A spring scale is pulled downward and readings
are recorded.
If the spring is pulled 3.5 cm, the spring scale
should read
A
B
C
D
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12 N.
13 N.
14 N.
15 N.
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CST 8th Grade Science
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4 A student records the mass and volume of a lump
6 An athlete can run 9 kilometers in 1 hour. If
of clay, x . Next, a second lump of clay, y , is added
to lump x , and the combined ( x + y ) mass and
volume are recorded. Finally, a third lump of clay,
z, is added to the combined ( x + y ) mixture, and
the final ( x + y + z ) mass and volume are recorded,
as shown below.
the athlete runs at that same average speed for 30
minutes, how far will the athlete travel?
A
B
C
D
18 kilometers
9 kilometers
4.5 kilometers
3.3 kilometers
7 How much time is required for a bicycle to travel a
distance of 100 m at an average speed of 2
What is the most logical conclusion about the clay
used in this investigation?
A
B
C
D
Lump z had the greatest mass.
A
B
C
D
0.02 s
50 s
100 s
200 s
8 Which of the following represents the velocity of a
moving object?
Lump y had the lowest density.
Lump y had the greatest mass.
A
B
C
D
kg
m3
.
2000
kg
Air has a density of 1 m
3 .
Which of the following has the lowest mass?
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?
Lump z had the lowest density.
5 Red-clay bricks have a density of approximately
A
B
C
D
m
s
2m 3 of bricks
4m 3 of bricks
6000m 3 of air
10,000m 3 of air
40
40 m north
40
40
m
s
m
s
north
9 Which characteristic of motion could change
without changing the velocity of an object?
A
B
C
D
the speed
the position
the direction
the acceleration
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CST 8th Grade Science
10 The graph below shows how the position of an
object changes over time.
What is the speed of the object during the time
interval from 4 seconds to 10 seconds?
A
B
C
D
m
s
m
3 s
8 ms
16 ms
2
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11 The graph below shows the speed of a vehicle over
time.
How far did the vehicle travel during the first two
seconds?
A
B
C
D
0.2 m
5m
10 m
20 m
12 A force is acting on each of the objects below.
What can be concluded about these forces?
A They are the same because they point toward
the objects.
B They are the same because they have the same
magnitude.
C They are different because they have different
magnitudes.
D They are different because they have different
directions.
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CST 8th Grade Science
13 Two students are pushing a cart, as shown below.
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15 Four forces are acting on a box, as shown below.
The cart will move as if it were acted on by a single
force with a magnitude of
A
B
C
D
This box will increase in speed
50 N.
150 N.
200 N.
350 N.
A
B
C
D
downward and to the left.
downward and to the right.
upward and to the left.
upward and to the right.
14 A ball is dropped from the top of a tall
building. As the ball falls, the upward force of air
resistance becomes equal to the downward pull of
gravity. When these two forces become equal in
magnitude, the ball will
A
B
C
D
flatten due to the forces.
fall at a constant speed.
continue to speed up.
slow to a stop.
16 A force of 5 N is required to increase the speed
of a box from a rate of 1.0 ms to 3.0 ms within 5
s along a level surface. What change would most
likely require additional force to produce the same
results?
A
B
C
D
reduce the mass of the box
increase the mass of the box
make the surfaces of the box smooth
make the surface of the floor smooth
17 What is the density of a 64-g iron cube that
displaces 8 mL of water?
A
B
C
D
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g
mL
g
32 mL
g
8 mL
g
4 mL
512
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CST 8th Grade Science
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18 A piece of pine wood floats on the surface of a
lake because the water exerts
20 The densities of four different woods are shown
below.
A an upward force equal to the weight of the
wood.
B a downward force equal to the weight of the
wood.
C an upward force equal to the weight of the
displacement water.
D a downward force equal to the weight of the
displacement water.
19 The following table shows properties of four
different sample materials. One of these materials
is cork, a type of wood that floats in water.
Which wood will sink when placed in a fluid with
a density of 1.14 cmg 3 ?
A
B
C
D
African teakwood
balsa
cedar
ironwood
21 Which of the following best describes an atom?
A protons and electrons grouped together in a
random pattern
B protons and electrons grouped together in an
Given that the density of water is 1
the samples is most likely cork?
g
mL
, which of
alternating pattern
C a core of protons and neutrons surrounded by
electrons
A
B
C
D
1
D a core of electrons and neutrons surrounded by
protons
2
3
4
22 Which of the following is found farthest from the
center of an atom?
A
B
C
D
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nucleus
proton
neutron
electron
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CST 8th Grade Science
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23 When magnesium (Mg) metal is burned in the
26 Iron oxides, such as rust, form when iron metal
presence of oxygen (O2 ), magnesium oxide
(MgO) is produced. The properties of magnesium
oxide are different than the individual properties of
magnesium and oxygen because magnesium oxide
is
reacts with oxygen in the air. What are the
chemical symbols for the two elements found in
iron oxide?
A
B
C
D
a solution.
a mixture.
a compound.
an element.
24 Within a substance, atoms that collide frequently
and move independently of one another are most
likely in a
A
B
C
D
liquid.
solid.
gas.
crystal.
A
B
C
D
I and O
Ir and O
Fe and O
Pb and O
27 What do the elements sulfur (S), nitrogen (N),
phosphorus (P), and bromine (Br) have in common?
A
B
C
D
They are noble (inert) gases.
They are nonmetals.
They have the same thermal conductivity.
They have the same number of protons.
28 A diagram of the periodic table of the elements is
shown below.
25
What is the name of the indicated atom in the
acetic acid molecule shown above?
A
B
C
D
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carbon
calcium
chromium
copper
In which region of the table would nonmetals be
found?
A
B
C
D
1
2
3
4
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CST 8th Grade Science
29 The table below shows the atomic mass of four
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32 A student divides several cubes into two groups,
stable calcium (Ca) isotopes.
based on whether or not each cube can float in
water. What property is the student using to
classify the cubes?
A
B
C
D
What characteristic is different in each isotope?
weight
density
conductivity
mass
A the position in the periodic table of the
elements
B the net charge of the nucleus
C the mass of the protons in the nucleus
D the number of neutrons in the nucleus
33
30 Which class of elements best conducts electricity?
A
B
C
D
metals
The galaxies pictured above would best be
classified as
nonmetals
semimetals
noble (inert) gases
31 In a comparison of metals to nonmetals, metals
A
B
C
D
barred galaxies.
spiral galaxies.
irregular galaxies.
symmetrical galaxies.
tend to have
A lower melting points and greater conductivity
than nonmetals.
B lower conductivity and lower density than
nonmetals.
C higher density and lower melting points than
nonmetals.
34 A galaxy is best described as a cluster of
A
B
C
D
hundreds of stars.
thousands of stars.
millions of stars.
billions of stars.
D greater conductivity and higher melting points
than nonmetals.
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CST 8th Grade Science
35 To express the distance between the Milky Way
galaxy and other galaxies, the most appropriate
unit of measurement is the
A
B
C
D
39 The following equations represent chemical reactions.
meter.
kilometer.
light-year.
astronomical unit.
36 Which of the following sets contains only objects
that shine as a result of reflected light?
A
B
C
D
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moons, planets, and comets
moons, comets, and stars
planets, stars, and comets
planets, stars, and moons
Which equation shows that the total mass during a
chemical reaction stays the same?
A
B
C
D
1
2
3
4
40 Which of the following forms of energy is released
or absorbed in most chemical reactions?
37 An object composed mainly of ice is orbiting the
Sun in an elliptical path. This object is most likely
A
B
C
D
a planet.
an asteroid.
a meteor.
a comet.
38 Copper (Cu) reacts with oxygen (O) to form
copper oxide (CuO). The properties of CuO are
most likely
A
B
C
D
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different from copper or oxygen.
A
B
C
D
light energy
electrical energy
sound energy
heat energy
41 As a sample of water turns to ice,
A
B
C
D
new molecules are formed.
the mass of the sample is increased.
the arrangement of the molecules changes.
energy is absorbed by the molecules.
similar to both copper and oxygen.
similar only to copper.
similar only to oxygen.
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CST 8th Grade Science
42 The table below shows the pH and reaction to
litmus of four body fluids.
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45 Which of the following compounds is most likely
to be part of living organisms?
A
B
C
D
C6 H12 O6
BF3
MoCl2
CsI
These data indicate that gastric juice is
A
B
C
D
very acidic.
very basic.
positively charged.
negatively charged.
43 What characteristic of carbon ( C ) makes it
essential to living organisms?
A Carbon forms crystal structures under certain
conditions.
B Carbon can exist as a solid, liquid, or gas.r
C Carbon bonds in many ways with itself to form
chains.
D Carbon exists in radioactive forms.
44 Which of the following elements is best able to
combine with itself and hydrogen (H) to form large
molecules?
A
B
C
D
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sodium (Na)
lithium (Li)
sulfur (S)
carbon ©
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CST 8th Grade Science
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Grade 8 Science Reference Sheet
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STOP