8th Grade Physical Science GMAS Challenge
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  • Question 1
    30 seconds
    Q.

    S8P1a Which is an example of a mixture?

    answer choices

    water

    hydrogen gas

    a blueberry muffin

    a spoon made of the element silver

  • Question 2
    30 seconds
    Q.

    S8P1a Which of the following is an example of a pure substance?

    answer choices

    a sample of oxygen gas

    a solution of sugar water

    a mixture of pasta and sauce

    an alloy of iron and carbon

  • Question 3
    30 seconds
    Q.

    S8P1a Ammonia can be represented by the chemical formula NH3. Which of the following best describes ammonia?

    answer choices

    an atom

    a compound

    an element

    a mixture

  • Question 4
    30 seconds
    Q.

    S8P1a An unknown substance is provided in a science class. It consists of particles that are different colors and different sizes. The particles are unevenly distributed throughout the substance. The substance is ___________.

    answer choices

    an element

    a compound

    a homogeneous mixture

    a heterogeneous mixture

  • Question 5
    30 seconds
    Q.

    S8P1a A diagram of a particle is shown above. The particle is most likely _________.

    answer choices

    an atom

    a molecule

    a homogeneous mixture

    a heterogeneous mixture

  • Question 6
    30 seconds
    Q.

    S8P1e Which are the name and atomic number for the element?

    answer choices

    K and 19

    K and 39.098

    Potassium and 19

    Potassium and 39.098

  • Question 7
    30 seconds
    Q.

    S8P1e An atom of the element has how many protons?

    answer choices

    18

    19

    39

    58

  • Question 8
    30 seconds
    Q.

    S8P1e Which of the following could be the chemical symbol representing the element cobalt?

    answer choices

    co

    Co

    CO

    Cob

  • Question 9
    30 seconds
    Q.

    S8P1e The model shows a neutral atom. How many protons are in this atom?

    answer choices

    2

    4

    5

    9

  • Question 10
    30 seconds
    Q.

    S8P1e In which period, or row, of the periodic table would you find this element?

    answer choices

    Period 2

    Period 4

    Period 6

    Period 7

  • Question 11
    30 seconds
    Q.

    S8P1b Which type of arrangment and movement would particles of mercury display?

    answer choices

    Particles closely packed together and they vibrate back and forth

    Particles are spread far apart and they move quickly

    Particles are close together but they are able to slip past one another

    Particles are spread far apart and electrons are detached from atoms

  • Question 12
    30 seconds
    Q.

    S8P1b In which state of matter do particles spread and fill the volume of the container that holds them?

    answer choices

    gas

    ice

    solid

    liquid

  • Question 13
    30 seconds
    Q.

    S8P1b How is plasma different from gas?

    answer choices

    Plasma has a definite shape, but gas does not

    Gas is hotter than plasma

    Electrons separate from atoms in plasma

    Gas has a definite volume, but plasma does not

  • Question 14
    30 seconds
    Q.

    S8P1c A scientist performs an investigation in which thermal energy is removed from a sample of a substance. When the substance begins to change from a gas to a liquid, the scientist measures the temperature of the substance. This temperature is the substance's _______

    answer choices

    melting point

    freezing point

    evaporation point

    condensation point

  • Question 15
    30 seconds
    Q.

    S8P1cd Which of the following is an example of a chemical change?

    answer choices

    water evaporating

    carbon joining with oxygen to form carbon dioxide

    ice cream melting

    salt dissolving in water to form a solution

  • Question 16
    30 seconds
    Q.

    S8P1cd What happens during a physical change?

    answer choices

    new substances are formed

    the identity of the substance is changed

    a chemical reaction occurs

    the form of a substance changes but not its identity

  • Question 17
    30 seconds
    Q.

    S8P1cd When enough heat is added to liquid water, it boils, and bubbles of water vapor rise to the surface and into the air. Which type of change is this and why?

    answer choices

    a chemical change because gas is produced

    a chemical change because heat is produced

    a physical change because the identity fo the substance changes

    a physical change, because the substance changes state

  • Question 18
    30 seconds
    Q.

    S8P1cd A sample of aluminum has a volume of 3.0 cm3 and a mass of 8.1g. Which is the density of aluminum?

    answer choices

    2.7 g/cm3

    5.1 g

    11.1 cm3

    24.3 g/cm3

  • Question 19
    30 seconds
    Q.

    S8P1f According to the law of conservation of matter, which of the following is true?

    answer choices

    In a chemical reaction, the total mass of the reactants is greater than the total mass of the products.

    In a chemical reactions, the total mass of the reactants is equal to the total mass of the products

    In a chemical reaction, elements change into other elements, but new matter is not created

    In a chemical reaction, matter cannot change form, but new matter can be created

  • Question 20
    30 seconds
    Q.

    S8P1f Look at the incomplete chemical equation: Ca + Cl2 --> ?

    The reactants are shown. How many chlorine (Cl) atoms must be present in the product that forms this reaction?

    answer choices

    1

    2

    3

    4

  • Question 21
    30 seconds
    Q.

    S8P1f During a chemical reaction, methane (CH4) and oxygen (O2) combine to produce carbon dioxide (CO2) and water (H2O). The balanced chemical equation identifies the reactants and products for this reaction, along with some of their masses.

    CH4 + 2O2 --> CO2 + 2H20

    16g + ? --> 44g + 36 g

    Which mass of oxygen (O2) is required for this reaction to occur?

    answer choices

    16 g

    36 g

    44 g

    64 g

  • Question 22
    30 seconds
    Q.

    S8P3a What is the runner's average speed?

    answer choices

    1/4 m/s

    4 m/s

    10 m/s

    40 m/s

  • Question 23
    30 seconds
    Q.

    S8P3a If the runner continues at the same speed, how far will the runner travel in 30 seconds?

    answer choices

    7.5 meter

    40 meters

    80 meters

    120 meters

  • Question 24
    30 seconds
    Q.

    S8P3a Which data table represents an object that is decelerating?

    answer choices
  • Question 25
    30 seconds
    Q.

    S8P3b A rocket is traveling through the atmosphere at a constant velocity. Which of the following is true?

    answer choices

    The rocket's engine is producing an unbalanced force that keeps the rocket in the air.

    All the forces acting on the rocket are balanced

    The rocket exerts a greater force on its exhaust gases than the gases exert on the rocket

    The rocket is moving, so some net force must be acting on it

  • Question 26
    30 seconds
    Q.

    S8P3b Student A and Student B are each standing on a skateboard. Student A pushes gently on Student B to start her moving. Student B starts moving away from Student A. What will happen to Student A and why?

    answer choices

    Student A will not move, because no forces are acting on her

    Student A will move toward Student B, because the same force affects both of them

    Student A will immediately stop moving because of friction

    Student A will move away from Student B, because an equal and opposite force pushes on her

  • Question 27
    30 seconds
    Q.

    S8P3c How is an object's mass related to the force needed to accelerate the object?

    answer choices

    Mass determines the direction of the force needed

    Mass determines the kind of force needed

    The greater the mass, the greater the force needed

    The smaller the mass, the greater the force needed

  • Question 28
    30 seconds
    Q.

    S8P5a Two objects move away from each other. What happens to the gravitational attraction between them?

    answer choices

    It decreases

    It increases

    It becomes zero

    It does not change

  • Question 29
    30 seconds
    Q.

    S8P5a Which of the following statements about gravitational fields is true?

    answer choices

    Gravitational fields affect objects only when two objects are touching

    Gravitational fields affect objects only if the objects are not in contact

    Any object that has a mass is surrounded by a gravitational field

    Only very massive objects, such as Earth, are surrounded by a gravitational field

  • Question 30
    30 seconds
    Q.

    S8P3b When a rocket attempts to launch, its engine exerts a force downward. The rocket will not launch until the force of the engine is greater than the weight of the rocket. Why?

    answer choices

    The forces must be equal and balanced for the rocket to move

    The force of the engine must be twice as strong as the force of gravity for the rocket to move

    The rocket must move at a constant velocity to take off

    The force of the engine must be greater than the force of gravity to produce a net force upward.

  • Question 31
    30 seconds
    Q.

    S8P3b If an object falls far enough, it will reach terminal velocity. At this velocity, the force of air resistance is equal to the force of gravity on the object. The forces on the falling object are balanced. What will happen to the object and why?

    answer choices

    The object will accelerate toward the ground because gravity is pulling on it

    The object will hover in midair because the forces on it are balanced

    The object will fall at a constant velocity because the forces on it are balanced

    The object will decelerate until it reaches a full stop at the ground

  • Question 32
    30 seconds
    Q.

    S8P5abc Two balloons are rubbed with a wool cloth. When the balloons are held near one another, they push away from each other. Why does this happen?

    answer choices

    The balloons have the same magnetic charge, so they repel each other

    The balloons have opposite magnetic charges, so they repel each other

    The balloons have the same electric charge, so they repel each other

    The balloons have opposite charges, so they repel each other

  • Question 33
    30 seconds
    Q.

    S8P5abc Which of the following is evidence that a magnetic field surrounds a magnet?

    answer choices

    When a paper clip is placed on a bar magnet, it sticks to the magnet

    When the north poles of two magnets are brought near each other, they push apart without touching

    When a magnet is placed on a metal surface, it sticks to the surface.

    When you touch a metal doorknob, sometimes you receive a shock

  • Question 34
    30 seconds
    Q.

    S8P5abc A magnet sticks to a table leg. Based on this information, which material could the table leg be made of?

    answer choices

    iron

    wood

    copper

    aluminum

  • Question 35
    30 seconds
    Q.

    S8P5abc Two negatively charged particles are 1 millimeter apart. The electric force between them is 20 newtons. How will the amount of electric force between the particles change if the particles move closer together?

    answer choices

    The electric force will increase

    The electric force will decrease

    The electric force will stay the same

    The electric force will disappear

  • Question 36
    30 seconds
    Q.

    S8P5ac Which material could be used for the core of an electromagnet?

    answer choices

    a wooden rod

    a vial of water

    a plastic rod

    a nickel rod

  • Question 37
    30 seconds
    Q.

    S8P5ac What does the iron core of an electromagnet do?

    answer choices

    It acts as a conductor, allowing more current to flow through the electromagnet

    It acts as an insulator, protecting people from electric shocks

    It produces a magnetic field that adds to the overall magnetic field of the electromagnet

    It produces the electric current that passes through the wire coil.

  • Question 38
    30 seconds
    Q.

    S8P5ac An engineer built a device. The main part of the device is a bicycle attached by wires to a light bulb. When the engineer pedals the bicycle, the light bulb lights up. How can the device best be classified?

    answer choices

    as a motor

    as a generator

    as an electromagnet

    as an armature

  • Question 39
    30 seconds
    Q.

    S8P5ac A student built a simple fan using an electromagnet, a permanent magnet, and a fan blade. When she connects the electromagnet to a single dry-cell battery, the fan blade turns. How would the student's fan most likely change if she connected it to two dry-cell batteries?

    answer choices

    The fan blade would turn faster

    The fan blade would turn slower

    The fan would turn in the opposite direction

    The fan would not turn at all

  • Question 40
    30 seconds
    Q.

    S8P2b At which point does the pendulum have the greatest potential energy?

    answer choices

    A

    B

    C

    D

  • Question 41
    30 seconds
    Q.

    S8P2b At which point does the pendulum have the greatest kinetic energy?

    answer choices

    A

    B

    C

    D

  • Question 42
    30 seconds
    Q.

    S8P2a Four objects are on a shelf 1.5 meters above the ground: a 350 gram trophy, a 100 gram picture frame, a 225 gram book, and a 600 gram vase. Which object has the most potential energy?

    answer choices

    book

    vase

    trophy

    picture frame

  • Question 43
    30 seconds
    Q.

    S8P2b A student throws a ball straight up. What happens to the ball's energy as it rises?

    answer choices

    The kinetic energy and potential energy of the ball do not change as it rises

    The kinetic energy of the ball changes into potential energy as the ball rises

    The potential energy of the ball changes into kinetic energy as the ball rises

    The kinetic energy of the ball decreases as it rises, but its potential energy does not change.

  • Question 44
    30 seconds
    Q.

    S8P2c Which of the following is a form of potential energy?

    answer choices

    sound energy

    chemical energy

    thermal energy

    mechanical energy

  • Question 45
    30 seconds
    Q.

    S8P2b A motor uses the magnetic field produced by an electric current to spin an armature. What kind of transformation takes place inside a motor?

    answer choices

    chemical energy transforms to magnetic energy

    thermal energy transforms to electrical energy

    gravitational energy transforms to chemical energy

    electrical energy transforms to mechanical energy

  • Question 46
    30 seconds
    Q.

    S8P2b Which of the following is the best example of a form of kinetic energy being transformed into a form of potential energy?

    answer choices

    During photosynthesis, plants use light from the sun to build sugar molecules

    During combustion, fuel, such as wood or oil, is broken down chemically to produce heat and light

    In a generator, an armature spinning in a magnetic field produces and electric current

    In a battery, a chemical reaction releases electrons that can flow as electric current

  • Question 47
    30 seconds
    Q.

    S8P2c Which of the following is not a source of stored chemical energy that can be turned into a form of kinetic energy?

    answer choices

    a battery in a toy car

    food

    the nucleus of an atom

    fossil fuels

  • Question 48
    30 seconds
    Q.

    S8P2d In which direction does heat move?

    answer choices

    from warmer areas to cooler areas

    from cooler areas to warmer areas

    between areas of equal temperature

  • Question 49
    30 seconds
    Q.

    S8P2d A metal spoon is placed in a pot of boiling water. Why does the spoon become hot over time?

    answer choices

    Currents of hot matter travel up the spoon from the water

    Light shining on the spoon causes it to become as hot as the water

    Particles in the water collide with particles in the spoon, which then strike other particles in the spoon, transferring energy

    Microwaves emitted by the hot water are absorbed by the spoon and transformed into thermal energy

  • Question 50
    30 seconds
    Q.

    S8P2d How is convection different from conduction?

    answer choices

    Convection can transfer heat through a vacuum, but conduction cannot

    Conduction can transfer heat through a vacuum, but convection cannot

    Convection takes place only in liquids and gases, but conduction transfers heat in solids as well

    Convection takes place only in solids, but conduction transfers heat in liquids and gases as well

  • Question 51
    30 seconds
    Q.

    S8P2d Which is an example of heat transfer through radiation?

    answer choices

    Light from a fire shines on objects, which absorb the light and transform it into thermal energy

    A fire consumes oxygen in air to produce ash and smoke

    A fire heats a pot, which transfers heat to beans in the pot

    A fire heats the air around it, which moves out from the fire in currents of warm air

  • Question 52
    30 seconds
    Q.

    S8P4a Which statement about waves is true?

    answer choices

    All waves travel through a medium

    All waves contain crests and troughs

    All waves contain compressions and rarefactions

    All waves transmit energy

  • Question 53
    30 seconds
    Q.

    S8P4f Wave A and Wave B have the same frequency and wavelength. Wave A has a greater amplitude than Wave B. Which statement best compares the two waves?

    answer choices

    Wave A has more energy than Wave B

    Wave B has more energy than Wave A

    Wave B transmits energy through matter, while Wave A does not

    Wave A transmits energy through matter, while Wave B does not

  • Question 54
    30 seconds
    Q.

    S8P4a Which waves contain compressions and rarefactions?

    answer choices

    transverse waves

    longitudinal waves

    electromagnetic waves

    all waves

  • Question 55
    30 seconds
    Q.

    S8P4f A bell and a siren are producing sound waves. The sound wave produced by the bell has a low frequency. The sound wave produced by the siren has a high frequency. Based on this information, which of the following must be true?

    answer choices

    The sound wave produced by the bell has a shorter wavelength than the sound wave produced by the siren

    The sound wave produced by the bell has a longer wavelength than the sound wave produced by the siren

    The sound wave produced by the bell has a higher amplitude than the sound wave produced by the siren

    The sound wave produced by the bell has a lower amplitude than the sound wave produced by the siren

  • Question 56
    30 seconds
    Q.

    S8P4f A musician is playing an electric guitar. She turns a knob to increase the amplitude of the sound wave produced. How does the sound change?

    answer choices

    the pitch increases

    the pitch decreases

    the volume increases

    the volume decreases

  • Question 57
    30 seconds
    Q.

    S8P4a What kind of wave is a sound wave?

    answer choices

    electromagnetic wave

    longitudinal wave

    transverse wave

    air wave

  • Question 58
    30 seconds
    Q.

    S8P4d A student yells from one side of Canyon A and records the time it takes to hear an echo. The student repeats the process for Canyon B. The time recorded for Canyon B is longer than for Canyon A. Which is the most likely conclusion based on this information?

    answer choices

    The rock in Canyon A is denser than the rock in Canyon B

    The rock in Canyon A is stiffer than the rock in Canyon B

    The distance across Canyon A is longer than the distance across Canyon B

    The distance across Canyon A is shorter than the distance across Canyon B

  • Question 59
    30 seconds
    Q.

    S8P4e In which medium would sound waves travel fastest?

    answer choices

    nitrogen gas

    liquid kerosene

    solid iron

    liquid water

  • Question 60
    30 seconds
    Q.

    S8P4a How do electromagnetic waves differ from mechanical waves?

    answer choices

    Mechanical waves have crests and troughs, but electromagnetic waves do not

    Mechanical waves need a medium through which to travel, but electromagnetic waves do not

    Electromagnetic waves come in many types, but mechanical waves are all the same

    Electromagnetic waves carry energy, while mechanical waves carry matter

  • Question 61
    30 seconds
    Q.

    S8P4b The chart above shows the range of wavelengths for different types of electromagnetic waves. Use the data in the chart to answer the question: Which of the waves transmits the least energy?

    answer choices

    gamma rays

    x-rays

    ultraviolet light

    visible light

  • Question 62
    30 seconds
    Q.

    S8P4c A scientist exposes a sample of the mineral fluorite to EM waves, causing the fluorite to glow. Which kind of EM wave did the scientist use?

    answer choices

    visible light

    radio waves

    ultraviolet light

    microwaves

  • Question 63
    30 seconds
    Q.

    S8P4c Both gamma rays and x-rays

    answer choices

    can be seen by humans

    can harm living cells

    are commonly used in communication

    require matter in order to transmit energy

  • Question 64
    30 seconds
    Q.

    S8P4c Which kinds of EM waves are you most likely to experience while sitting at a campfire?

    answer choices

    microwaves and infrared light

    infrared light and visible light

    visible light and ultraviolet light

    ultraviolet light and x rays

  • Question 65
    30 seconds
    Q.

    S8P4d What happens to a light wave that is absorbed by matter?

    answer choices

    It is reflected from the surface of the matter

    It is refracted

    It bends around the matter

    Its energy is turned into heat

  • Question 66
    30 seconds
    Q.

    S8P4d Which statement explains why a green leaf looks green?

    answer choices

    The leaf refracts sunlight, causing it to appear green

    The leaf diffracts sunlight, causing it to appear green

    The leaf reflects green light and absorbs other colors

    The leaf absorbs green light and reflects other colors

  • Question 67
    30 seconds
    Q.

    S8P4d In the diagram above, the solid arrow represents a light wave traveling through air. Which dashed arrow represents the path the light will travel after reaching the glass?

    answer choices

    A

    B

    C

    D

  • Question 68
    30 seconds
    Q.

    S8P4g Which of the following best describes the purpose of a lens in a camera?

    answer choices

    to focus light waves

    to reflect light waves

    to absorb an image

    to produce light

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