# CST Science Pre-test Prep Test 8th Graders

29 Questions | Total Attempts: 4129 Settings • 1.
Two students are pushing a cart as shown. The right is pushing 200 N and the left is pushing 150 N. The cart will move as if it were acted on by a single force with a magnitude of...
• A.

50 N.

• B.

150 N.

• C.

200 N.

• D.

350 N.

• 2.
An athelete can run 9 kilometers in 1 hour. If the athelete runs at that same average speed for 30 minutes, how far will the athelete travel?
• A.

18 kilometers

• B.

9 kilometers

• C.

4.5 kilometers

• D.

3.3 kilometers

• 3.
To express the distance between the MIlky Way galaxy and other galaxies, the MOST appropriate unit of measurement is the...
• A.

Meter.

• B.

Kilometer.

• C.

Light-year.

• D.

Astronomical unit.

• 4.
Which characteristic of motion could change without changing the velocity of an object?
• A.

The speed

• B.

The position

• C.

The direction

• D.

The acceleration

• 5.
Which of the following compounds is MOST likely to be part of living organisms?
• A.

C4 H12 O6

• B.

BF3

• C.

MoCl2

• D.

CsI

• 6.
A ball is dropped from the top of a tall building. As the ball falls, the upward force of air restistance 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.

• B.

Fall at a constant speed.

• C.

Continue to speed up.

• D.

Slow to a stop.

• 7.
A force of 5 N is required to increase the speed of a box from a rate of 1.0 m / s to m / s within 5 salong a level surface. What change would MOST likely require additional force to produce the same results?
• A.

Reduce the mass of the box

• B.

Increase the mass of the box

• C.

Make the surfaces of the box smooth

• D.

Make the surface of the floor smooth

• 8.
A piece of pine wood floats on the surface of a lake because the water exerts...
• 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.

• 9.
Which of the following is found farthest from the center of an atom?
• A.

Nucleus

• B.

Proton

• C.

Neutron

• D.

Electron

• 10.
Which of the following elements is BEST able to combine with itself and Hydrogen(H) to form large molecules?
• A.

Sodium (Na)

• B.

Lithium (Li)

• C.

Sulfur (S)

• D.

Carbon (C)

• 11.
Which of the following represents the velocity of a moving object?
• A.

40

• B.

40 m north

• C.

40 m / s

• D.

40 m / s north

• 12.
Which of the following forms of energy is released or absorbed in MOST chemical reaction?
• A.

Light energy

• B.

Electrical energy

• C.

Sound energy

• D.

Heat energy

• 13.
Which of the following BEST describes an atom?
• A.

Protons and electrons grouped together in a random pattern

• B.

Protons and electrons grouped in an alternating pattern

• C.

A core of protons and neutrons surrounded by electrons

• D.

A core of electrons and neutrons surrounded by protons

• 14.
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.

2m3 of bricks

• B.

4m3 of bricks

• C.

6000m3 of air

• D.

10,000m3 of air

• 15.
What do the the elements sulfur (S), nitrogen (N), phosphorus (P), and bromine(Br) have in common?
• A.

They are noble (inert) gases.

• B.

They are nonmetals.

• C.

They have the same thermal conductivity.

• D.

They have the same number of protons.

• 16.
Which class of elements BEST conducts electricity?
• A.

Metals

• B.

Nonmetals

• C.

Semimetals

• D.

Noble (inert) gases

• 17.
What is the density of a 64-g iron cube that displaces 8 mL of water?
• A.

512 g / mL

• B.

32 g / mL

• C.

8 g / mL

• D.

4 g / mL

• 18.
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

• B.

50 s

• C.

100 s

• D.

200 s

• 19.
A galaxy is BEST described as a cluster of...
• A.

Hundreds of stars.

• B.

Thousands of stars.

• C.

Millions of stars.

• D.

Billions of stars.

• 20.
When magnesium (Mg) metal is burned in the 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...
• A.

A solution.

• B.

A mixture.

• C.

A compound.

• D.

An element.

• 21.
Which of the following sets contains only objects that shine as a result of reflected light?
• A.

Moons, planets, and comets

• B.

Moons, comets, and stars

• C.

Planets, stars, and comets

• D.

Planets, stars, an moons

• 22.
Within a substance, atoms that collide frequently and more independently of one another are MOST likely in a...
• A.

Liquid.

• B.

Solid.

• C.

Gas.

• D.

Crystal.

• 23.
In a comparison of metals to nonmetals, metals 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.

• D.

Greater conductivity and higher melting points than nonmetals.

• 24.
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.

• C.

Carbon bonds in many ways with itself to form chains.

• D.

• 25.
As a smaple of water turns to ice,...
• A.

New molecules are formed.

• B.

The mass of the sample is increased.

• C.

The arrangement of the molecules changes.

• D.

Energy is absorbed by the molecules.

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