8th Grade Physical Science Final Exam

A student observes that when a rubber band is stretched, it can snap back to its original shape. Which type of potential energy is primarily stored in the stretched rubber band?

• Gravitational potential energy

• Elastic potential energy

• Chemical potential energy

• Thermal energy

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AL.SCI.8.3.1.14

Which of the following best describes how digital signals transmit information compared to analog signals?

• Digital signals use continuous waves, while analog signals use discrete values.

• Digital signals use discrete values, while analog signals use continuous waves.

• Both digital and analog signals use only continuous waves.

• Both digital and analog signals use only discrete values.

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AL.SCI.8.4.2.18

A student combines two clear liquids in a beaker. The mixture becomes cloudy and a solid forms at the bottom. What does this observation most likely indicate?

• A physical change has occurred.

• A chemical reaction has occurred.

• The temperature has increased.

• The substances have evaporated.

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AL.SCI.8.1.2.6

Which factor would most likely increase the strength of a magnetic field produced by an electromagnet?

• Decreasing the number of coils in the wire

• Increasing the current through the wire

• Using a plastic core instead of an iron core

• Decreasing the voltage supplied

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AL.SCI.8.2.1.12

When ice is heated and begins to melt, what happens to the motion of its particles?

• The particles move slower and get closer together.

• The particles move faster and spread apart.

• The particles stop moving.

• The particles become larger.

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AL.SCI.8.1.1.2

Which of the following is an example of gravitational potential energy?

• A stretched spring

• A battery storing energy

• A book placed on a shelf

• A moving car

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AL.SCI.8.3.1.14

Which statement best explains why digital signals are less likely to lose information over long distances compared to analog signals?

• Digital signals are immune to all types of interference.

• Digital signals can be easily regenerated without loss of quality.

• Analog signals are always stronger than digital signals.

• Analog signals use binary code.

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AL.SCI.8.4.2.18

A student mixes vinegar and baking soda in a flask and observes bubbling and gas production. What does this indicate about the substances?

• They have formed a solution.

• A chemical reaction has occurred.

• The temperature has decreased.

• The substances have dissolved.

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AL.SCI.8.1.2.6

Which change would most likely increase the strength of an electromagnet?

• Using fewer coils of wire

• Using a wooden core

• Increasing the number of coils around the core

• Decreasing the electric current

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AL.SCI.8.2.1.12

What happens to the temperature of a substance when thermal energy is removed from it?

• The temperature increases.

• The temperature decreases.

• The temperature stays the same.

• The substance evaporates.

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AL.SCI.8.1.1.2