Which action will demonstrate that the balloons can either attract or repel each other?

Rub both balloons with a wool rag to generate an electric field.

Push the balloons toward each other to generate a magnetic field.

Place a magnet in between the balloons to generate a magnetic field.

Cover one balloon with a cotton cloth to generate a gravitational field.

Which statement about the object's motion is true?

The speed is greatest at segment 3.

The speed at segment 2 is faster than segment 3.

The speed is slowest at segment 3.

The speed at segment 4 is faster than segment 3.

A 2000kg bus and a 750kg car are traveling down a street at the same velocity. When approaching a stoplight, which vehicle would need to apply its brakes first?

The bus would need to apply its brakes first because it has greater momentum due to its larger mass and would need a longer stopping distance.

The bus would need to apply its brakes first because the larger mass causes it to have a greater acceleration which requires more time to decelerate.

The car would need to apply its brakes first because its smaller mass allows for greater acceleration, which requires a longer stopping distance.

Both vehicles would need to apply brakes at the same time because the velocity and acceleration are the same for both.

The frequency of a transverse wave increases, but its speed remains constant. How does this influence the wave's wavelength and the amount of energy carried by the wave?

The wavelength decreases, and the energy carried by the wave increases

Both the wavelength and the energy carried by the wave increase

Both the wavelength and the energy carried by the wave decrease

The wavelength increases, and the energy carried by the wave decreases.

How does the gravity of the Sun and the Moon affect the Earth's tides?

The Moon has a greater pulling effect on the Earth's tides because it is closer to the Earth than the Sun.

The Sun has a greater pulling effect on the Earth's tides because it is larger than the Moon.

The highest tides on Earth occur when the Sun and the Moon are at right angles to each other.

The difference between high and low tides is minimal when the Moon and Sun are in a straight line with the Earth.

What effect will the positions of the Moon have on Earth's tides?

Both Positions 1 and 2 will cause spring tides.

Both Positions 1 and 2 will cause neap tides.

Position 2 will cause neap tides, and Position 1 will cause spring tides.

Position 1 will cause spring tides, and Position 2 will cause neap tides.

Is the researcher correct?

Yes. Light from any object moving away from Earth shifts to red-colored light.

No. All hot stars emit red-colored light.

Yes. All moving objects emit red-colored light.

No. The red-colored light emission is due to the composition of the star.

The student claims the model accurately describes the motion of the galaxies in the universe. What evidence from the model supports the student's claim?

As the dough rises, the distance between the raisins increases, indicating that the galaxies are moving apart.

As the dough rises, the size of the raisins increases, resembling the expansion of the galaxies.

As the dough rises, the distance between the raisins decreases, indicating that the galaxies will collide.

As the dough rises, the size of the raisins decreases, resembling the emission of light from stars.

Which claim is correct and why?

Claim 3; galaxies move apart as the universe expands, which shifts the light towards the red end of the spectrum.

Claim 1; spectral lines can be obtained only from the stars that emit light towards the red end of the spectrum.

Claim 2; large galaxies only produce light that shows spectral lines towards the red end of the spectrum.

Claim 4; the wavelengths of light emitted from cool surfaces are long, which shifts the light towards the red end of the spectrum.

Scientists suggest that the universe is still expanding. Which statement supports the claim by scientists?

The galaxies in the universe are moving away from Earth at high speeds.

The universe is 13.7 billion years old.

The galaxies in the universe are composed of dark matter.

The universe originated from a hot, dense point.

Why is digitalization the best method for the transmission of information?

The information can be stored for future recovery.

These signals generate usable energy.

These signals require a medium to transfer unlike ultraviolet waves.

The information can be sent over long distances with zero percentage loss.

What happened to this sound wave?

The wave's energy was absorbed.

The wave's energy was amplified.

The wave's energy was reflected.

The wave's energy was refracted.

Which option correctly identifies the behaviors of the light rays?

Light ray 1 is absorbed, light ray 2 is refracted, and light ray 3 is reflected.

Light ray 1 is reflected, light ray 2 is absorbed, and light ray 3 is refracted.

Light ray 1 is absorbed, light ray 2 is reflected, and light ray 3 is refracted.

Light ray 1 is refracted, light ray 2 is reflected, and light ray 3 is absorbed.

How will students be able to use this device in a science experiment?

They can use the temporary magnetic field it creates to pick up metal paper clips.

They can use the electricity it generates to power a light bulb.

They can use the device as a switch in an electrical circuit.

They can use its chemical energy to create electricity that spins the coiled wire.

Which option correctly compares the 2 setups?

setup A: A simple electromagnetic has been made that can attract objects that contain iron; setup B: A simple electric motor has been made that can spin a copper coil and power a mechanical device.

setup A: A simple electromagnetic has been made that can spin a copper coil and power a mechanical device; setup B: A simple electric motor has been made that can attract objects that contain iron.

setup A: A simple lead-acid battery has been made that can supply electricity to power an electric device; setup B: A simple photovoltaic cell has been made that can harness energy from the Sun.

setup A: A simple lead acid battery has been made that can harness energy from the Sun; setup B: A simple photovoltaic cell has been made that can supply electricity to light an electric device.

What causes the coil to begin rotating in the electric motor?

The battery creates a flow of current in the coil, which creates a magnetic field around the coil, causing it to rotate continuously as it interacts with the magnet.

The electric current produced by the battery produces a magnetic field in the coil and the magnet, interacting to produce a current on the coil that causes it to rotate.

The magnet’s magnetic field causes the coil to create its own current, which interacts with the battery’s electric field, causing the coil to rotate.

The electric current produced by the battery flows through the coil, causing an electric field in the magnet that rotates the coil.

A student suspends 2 inflated balloons from the ceiling. The student wants to show that a field exists between the balloons exerting forces on each other even though the balloons are not in contact. Which action will demonstrate that the balloons can either attract or repel each other?

Rub both balloons with a wool rag to generate an electric field.

Push the balloons toward each other to generate a magnetic field.

Place a magnet in between the balloons to generate a magnetic field.

Cover one balloon with a cotton cloth to generate a gravitational field.

In 2009, there were 3,494 radio stations in the US. Radio became a common device for transmitting and recieving signals. Why is there a large number of radio stations across the US?

Signals and data are easily transmitted and transformed by radio stations.

Significant amounts of data can be transmitted at the same time.

There is no loss of information during transmission.

Radio stations can transmit signals clearly even in bad weather conditions.

Which student's information should be corrected?

Student 4; radio waves transfer large amounts of data that can be stored.

Student 1; cell phones work using digital signals.

Student 2; radio waves need mediums to transmit data.

Student 3; cell phones send and receive signals via satellites only.

What property of light allows prisms and diffraction gratings to separate white light into its component colors?

The colors have the same speed but different frequencies.

The colors have the same frequency but different wavelengths.

The colors have the same frequency but different speeds.

The colors have the same wavelength but different frequencies

A city is celebrating an event with fireworks. During the show, an aerial firework safety explodes in the night sky. If a person is standing 0.5km away from the fireworks show, which statement correctly describes what the person would experience?

First, the person would see the light produced by the fireworks, and then the person would hear the sound produced by the fireworks.

First, the person would hear the sound produced by the fireworks, and then the person would see the light produced by the fireworks.

The person would hear the sound produced by the fireworks and see the light produced by the fireworks at the same time.

The person would see the light produced from the fireworks but would not hear any sound from the fireworks.

Which best describes the difference in the 2 waves?

Wave 1 has a much larger amplitude than Wave 2.

The frequency of Wave 1 is much higher than the frequency of Wave 2.

The wavelength of Wave 1 is at least twice the wavelength of Wave 2.

Waves 1 and 2 are traveling through different media.

What can be concluded about the waves?

Wave 1 has a shorter wavelength than Wave 2.

Wave 1 is mechanical; Wave 2 is electromagnetic.

Wave 2 transfers twice as much energy as Wave 1.

Wave 2 has a higher frequency than Wave 1.

Science Benchmark Test Practice

Authored by Charles Martinez

Science

8th Grade

NGSS covered

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47 questions

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MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which modification would increase the magnetic strength of the electromagnet?

using a thinner nail

decreasing the length of the nail

increasing the number of turns in the coil

decreasing the number of turns in the coil

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Based on the data, which modifications will result in generating the fastest speed of the motor?

fewer turns of thicker copper wire for the coil

more turns of thinner copper wire for the coil

more turns of thicker copper wire for the coil

fewer turns of thinner copper wire for the coil

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-PS3-5

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

A space mission to Mars detected the presence of argon in its atmosphere. Which type of instrument was in the space mission to Mars that helped detect the presence of argon?

radio telescope

reflector telescope

satellite

spectroscope

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What conclusion is supported by the data?

The strength of an electromagnet cannot be predicted based on the number of coils.

The strength of an electromagnet increases as the number of coils increases.

The strength of an electromagnet does not depend on the number of coils.

The strength of an electromagnet decreases as the number of coils increases.

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is the difference between the magnetic field of a bar magnet and electromagnet?

The magnetic field produced in a bar magnet has a higher intensity than that of an electromagnet.

The magnetic field in an electromagnet lasts only as long as there is a supply of electric current.

The intensity of the magnetic field in a bar magnet can be increased or decreased.

The direction of the magnetic field in a bar magnet varies with respect to time.

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

In which location was the gravitational force the weakest between the center of the Earth and Mike?

location W

location X

location Y

location Z

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

How can the student arrange the magnets to feel the force of the magnetic field as a result of repulsion?

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

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Science Benchmark Test Practice

Which modification would increase the magnetic strength of the electromagnet?

Based on the data, which modifications will result in generating the fastest speed of the motor?

A space mission to Mars detected the presence of argon in its atmosphere. Which type of instrument was in the space mission to Mars that helped detect the presence of argon?

What conclusion is supported by the data?

What is the difference between the magnetic field of a bar magnet and electromagnet?

In which location was the gravitational force the weakest between the center of the Earth and Mike?

How can the student arrange the magnets to feel the force of the magnetic field as a result of repulsion?

Which action will demonstrate that the balloons can either attract or repel each other?

A student applies force to a cart. Which model accurately shows a cart that will remain stationary?

Which statement about the object's motion is true?

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