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

Increasing the number of coils around the core

Decreasing the electric current

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

The temperature stays the same.

A student is comparing the potential energy of a ball at the top of a hill and at the bottom. Which statement is correct?

The ball has more potential energy at the top.

The ball has more potential energy at the bottom.

The ball has the same potential energy at both positions.

The ball has no potential energy at either position.

Which of the following best describes how analog signals encode information?

By varying continuously over a range of values

By using only two values, 0 and 1

A student observes that after mixing two substances, the temperature of the mixture increases. What does this most likely indicate?

The substances have cooled down.

Which factor would decrease the strength of a magnetic field around an electromagnet?

Increasing the electric current

Why are digital signals often preferred for transmitting information over long distances?

They are less affected by noise and interference.

They are more difficult to process.

They are always faster than analog signals.

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

Increasing the electric current

What happens to the state of a pure substance when thermal energy is added?

It may change from solid to liquid or liquid to gas.

A student is given a model showing a ball at different heights. How can the student use this model to explain the relationship between height and gravitational potential energy?

By showing that the higher the ball, the more gravitational potential energy it has

By stating that the ball has the same energy at all heights

By showing that the ball loses energy as it goes higher

By stating that height does not affect energy

Given a scenario where a digital signal is transmitted through a noisy environment, construct an argument using evidence to explain why the information is still accurately received.

Digital signals can be regenerated and errors can be corrected due to their discrete nature.

Digital signals are immune to all noise.

Analog signals are always more reliable.

Digital signals travel faster than analog signals.

A student uses a model to show how stretching a spring stores energy. How can the student explain the difference between elastic and chemical potential energy using this model?

By showing that elastic energy is stored by stretching, while chemical energy is stored in bonds

By stating that chemical energy is only in batteries

By showing that elastic energy is stored in food

Construct an argument from evidence to explain how analog signals can lose information during transmission.

Analog signals can be distorted by noise, causing loss of information.

Analog signals are always perfect.

Analog signals are immune to interference.

A student observes that a mixture of two substances produces bubbles and a temperature change. How can the student use data to determine if a chemical reaction has occurred?

By analyzing the formation of gas and temperature change as evidence of a chemical reaction

By noting only the color change

By ignoring the temperature change

By stating that all mixtures are chemical reactions

A student designs an experiment to test the strength of an electromagnet by changing the number of coils. How should the student use evidence to support their conclusion?

By measuring the number of paper clips picked up and relating it to the number of coils

Given a model of particles in a solid, liquid, and gas, how can a student explain the effect of adding thermal energy on particle motion and state?

By showing that adding thermal energy increases particle motion and can change the state from solid to liquid to gas

By stating that particles do not move

By stating that thermal energy only affects solids

By stating that gases become solids when heated

A student uses a model to show how the distance between two magnets affects the strength of the magnetic force. How can the student use this model to explain the relationship?

By showing that increasing the distance decreases the magnetic force

By stating that distance does not matter

By stating that magnets only work when touching

By showing that force increases with distance

A student observes that when two substances are mixed, the temperature drops and a new solid forms. How can the student analyze this data to determine if a chemical reaction has occurred?

By noting the temperature drop and solid formation as evidence of a chemical reaction

By ignoring the temperature change

By stating that all mixtures are physical changes

Observe the picture and select the correct answers. Liquid is the state of matter that and it has its own definite .

takes the shape of its container

Match the vocabulary word with the correct definition.

The different forms in which matter can be found

The state of matter that has a definite volume but no fixed shape (ex. water)

The state of matter that has a definite shape and volume. Their shape and volume cannot be easily changed. (ex. ice)

The state of matter that has no definite shape and take the shape of their container. (ex. water vapor)

Anything that has mass and takes up space. It cannot be created nor destroyed.

Which of these children has more potential energy? (Choose 2)

The one at the top of the slide because of his position.

The one at the top because of his mass.

The one at the bottom of the slide because of his position.

The one at the bottom because of his mass.

Which of these children has more potential energy? (Choose 2)

The one at the top of the slide because of his position.

The one at the top because of his mass.

The one at the bottom of the slide because of his position.

The one at the bottom because of his mass.

8th Grade Physical Science Final Exam

Authored by Dr. A. Fincher

Science

8th Grade

NGSS covered

Used 2+ times

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Content View

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50 questions

Show all answers

MULTIPLE CHOICE QUESTION

1 min • 2 pts

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

Tags

AL.SCI.8.3.1.14

MULTIPLE CHOICE QUESTION

1 min • 2 pts

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.

Tags

AL.SCI.8.4.2.18

MULTIPLE CHOICE QUESTION

1 min • 2 pts

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.

Tags

AL.SCI.8.1.2.6

MULTIPLE CHOICE QUESTION

1 min • 2 pts

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

Tags

AL.SCI.8.2.1.12

MULTIPLE CHOICE QUESTION

1 min • 2 pts

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.

Tags

AL.SCI.8.1.1.2

MULTIPLE CHOICE QUESTION

1 min • 2 pts

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

Tags

AL.SCI.8.3.1.14

MULTIPLE CHOICE QUESTION

1 min • 2 pts

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.

Tags

AL.SCI.8.4.2.18

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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?

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

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?

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

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

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

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

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

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

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

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