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Science 8 CST Practice Test



Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1 

The graph below shows the movement of an object at several points in time.

What is the average speed of the object
mc001-1.jpg
A
0.5 meters/minute
C
25 meters/minute
B
2 meters/minute
D
50 meters/minute
 

 2 

Data from an experiment are presented below.
mc002-1.jpg
The slope of the graph represents what characteristic of an object?
A
displacement
C
speed
B
force
D
inertia
 

 3 

A spring scale is pulled downward and readings are recorded.
mc003-1.jpg
If the spring is pulled 3.5 cm, the spring scale should read
A
12 N.
C
14 N.
B
13 N.
D
15 N.
 

 4 

A student records the mass and volume of a lump 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.

mc004-1.jpg

What is the most logical conclusion about the clay used in this investigation?
A
Lump z had the greatest mass.
C
Lump y had the lowest density.
B
Lump z had the lowest density.
D
Lump y had the greatesr mass.
 

 5 

Red-clay bricks have a density of approximately 2000 kg/m3. Air has a density of 1 kg/m3. Which of the following has the lowest mass?
A
2 m3 of bricks.
C
6000 m3 of air.
B
4 m3 of bricks.
D
10,000 m3 of air.
 

 6 

An athlete can run 9 kilometers in 1 hour. If the athlete runs at the same average speed for 30 minutes, how far will the athlete travel?
A
18 kilometers
C
4.5 kilometers
B
9 kilometers
D
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 m/s?
A
0.02 s
C
100 s
B
50 s
D
200 s
 

 8 

Which of the following represents the velocity of a moving object?
A
40
C
40 m/s
B
40 m north
D
40 m/s north
 

 9 

Which characteristic of motion could change without changing the velocity of an object?
A
the speed
C
the direction
B
the position
D
the acceleration
 

 10 

The graph shows a position of an object changes over time.
mc010-1.jpg
What is the speed of the object during the time interval from 4 seconds to 10 seconds?
A
2 m/s
C
8 m/s
B
3 m/s
D
16 m/s
 

 11 

The graph below shows the speed of a vehicle over time.

mc011-1.jpg
How far did the vehicle travel during the first two seconds?
A
0.2 m
C
10 m
B
5 m
D
20 m
 

 12 

A force is acting on each of the objects below.
mc012-1.jpg
What can be concluded about these forces?
A
They are the same because they point toward the objects.
C
They are different becaise they have different magnitudes.
B
They are the same because they have the same magnitude.
D
They are different because they have different directions.
 

 13 

Two students are pushing a cart, as shown below.
mc013-1.jpg
The cart will move as if it were acted on by a single force with a magnitude of
A
50 N.
C
200 N.
B
150 N.
D
350 N.
 

 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
flatten due to the forces.
C
continue to speed up.
B
fall at a constant speed.
D
slow to a stop.
 

 15 

Four forces are acting on a box, as shown below.
mc015-1.jpg
This box will increase in speed
A
downward and to the left.
C
upward and to the left.
B
downward and to the right.
D
upward and to the right.
 

 16 

A force of 5 N is required to increase the speed of a box from a rate of 1.0 m/s to 3.0 m/s within 5 s along a level surface. What change would most likely require additional force to produce the same results?
A
reduce the mass of the box.
C
make the surfaces of the box smooth.
B
increase the mass of the box.
D
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
512 g/mL
C
8 g/mL
B
32 g/mL
D
4 g/mL
 

 18 

The following table shows properties of four different sample materials. One of these materials is cork, a type of wood that floats in water.
mc018-1.jpg
Given that the density of water is 1 g/mL which of these samples is most likely cork?
A
1
C
3
B
2
D
4
 

 19 

The densities of four different woods are shown below.

mc019-1.jpg

Which woof will sink when placed in a fluid with a density of 1.14 g/cm3?
A
African teakwood
C
cedar
B
balsa
D
ironwood
 

 20 

Which of the following best describes an atom?
A
protons and electrons grouped together in a random pattern.
C
a core of protons and neutrons surrounded by electrons.
B
protons and electrons group together in an alternating pattern.
D
a core of electrons and neutrons surrounded by protons.
 

 21 

Which of the following is found farthest from the center of an atom?
A
nucleus
C
neutron
B
proton
D
electron
 

 22 

When magnesium (Mg) metal is burned in the presence of oxygen (Omc022-1.jpg), magnesium oxide (MgO) is produced. The properties of magnesium oxide are different than the individual properties of magnesium and oxygen because magnesium oxide is
A
a solution.
C
a compound.
B
a mixture.
D
an element.
 

 23 

Within a substance, atoms that collide frequently and move independently of one another are most likely in a
A
liquid.
C
gas.
B
solid.
D
crystal.
 

 24 


mc024-1.jpg

What is the name of the indicated atom in the acetic acide molecule shown above?
A
carbon
C
chromium
B
calcium
D
copper
 

 25 

Iron oxides, such as rust, form when iron metal reacts with oxygen in the air. What are the chemical symbols for the two elements found in iron oxide?
A
I and O
C
Fe and O
B
Ir and O
D
Pb and O
 

 26 

What do the elements sulfur (S), nitrogen (N), phosphorus (P), and bromine (Br) have in common?
A
They are noble (inert) gases.
C
They have the same thermal conductivity.
B
They are nonmetals.
D
They have the same number of protons.
 

 27 

A diagram of the periodic table of the elements is shown below.

mc027-1.jpg

In which region of the table would nonmetals be found?
A
1
C
3
B
2
D
4
 

 28 

The table below shows the atomic mass of four stable calcium (Ca) isotopes.

mc028-1.jpg

What characteristics is different in each isotope?
A
the position in the periodic table of the elements
C
the mass of the protons in the nucleus
B
the net charge of thje nucleus
D
the number of neutrons in the nucleus
 

 29 

Which class of elements best conducts electricity?
A
metals
C
semimetals
B
nonmetals
D
noble (inert) gases
 

 30 

In a comparison of metals to nonmetals, metals tend to have
A
lower melting points and greater conductivity than nonmetals.
C
higher density and lower melting points than nonmetals.
B
lower conductivity and lower density than nonmetals.
D
greater conductivity and higher melting points than nonmetals.
 

 31 

A student divides several cubes into two groups, based on whether or not each cube can float in water. What property is the student using to classify the cubes?
A
weight
C
conductivity
B
density
D
mass
 

 32 


mc032-1.jpg

The galaxies pictured above would best be classified as
A
barred galaxies.
C
irregular galaxies.
B
spiral galaxies.
D
symmetrical galaxies.
 

 33 

A galaxy is best described as a cluster of
A
hundreds of stars.
C
millions of stars.
B
thousands of stars.
D
billions of stars.
 

 34 

To express the distance between the Milky Way galaxy and the other galaxies, the most appropriate unit of measurement is the
A
meter.
C
light-year.
B
kilometer.
D
atronomical unit.
 

 35 

Which of the following sets conatins only obejcts that shine as a result of reflected light?
A
moons, planets, and comets
C
planets, stars, and comets
B
moons, comets, and stars
D
plantes, stars, and moons
 

 36 

An objects composed mainly of ice is orbitting the Sun in an elliptical path. This object is most likely
A
a planet.
C
a meteor.
B
an asteroid.
D
a comet.
 

 37 

Copper (Cu) reacts with oxygen (O) to form copper oxide (CuO). The properties of CuO are most likely
A
different from copper or oxygen
C
similar only to copper
B
similar to both copper and oxygen
D
similar only to oxygen
 

 38 

The following equations represent chemical reactions.
mc038-1.jpg
A
1
C
3
B
2
D
4
 

 39 

Which of the following forms of energy is released or absorbed in most chemical reactions ?
A
light energy
C
sound energy
B
eletrical energy
D
heat energy
 

 40 

As a sample of water turns to ice,
A
new molecules are formed.
C
the arrangement of the molecules changes.
B
the mass of the sample is increased.
D
energy is absorbed by the molecules.
 

 41 

The tablenbelow shows the pH and reaction to litmus of four body fluids.
mc041-1.jpg
A
very acidic.
C
positively charged.
B
very basic.
D
negatively charged.
 

 42 

What characteristics of carbon (C) makes it essential to living organsims?
A
Carbon forms crystal structures under certain conditions.
C
Carbon bonds in many ways with itself to form chains.
B
Carbon can exist as a solid, liquid, or gas.
D
Carbon exists in radioactive forms.
 

 43 

Which of the following elements is best able to combine with itself and hydrogen (H) to form large molecules?
A
Sodium (Na)
C
Sulfur (S)
B
Lithium (Li)
D
Carbon (C)
 

 44 

Which of the following componds is most likely to be part of living organisms?
A
C6H12O6
C
MoCl2
B
BF3
D
CsI
 



 
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