Sound is able to travel faster in solids than in air because the molecules in a solid are

closer together than air molecules

more easily moved than air molecules

moving faster than air molecules moving faster than air molecules

You cannot hear sound in space because_____.

There are no particles for the sound to to be transmitted on. It is a vacuum.

It contains only air molecules and no solids or liquids.

The particles are not close enough together.

How does the density of a medium affect the speed at which sound travels through it?

The denser the medium, the faster sound travels because molecules are more tightly packed.

The denser the medium, the slower sound travels because molecules are farther apart.

Sound travels at the same speed regardless of the medium's density.

The density of the medium does not affect the speed of sound, only the temperature does.

How does pedaling a bicycle generate electricity?

The movement of the pedals turns a dynamo or generator, converting mechanical energy into electrical energy.

The pedals create heat, which is converted into electricity by a generator.

Pedaling creates chemical reactions in the bicycle's battery, which then produce electricity.

The friction between the wheels and the ground generates electricity through electromagnetic induction.

According to Newton's Third Law of motion, in every collision the action and reaction forces are always _____.

greater than the original force

determined by the objects involved

dependent upon the amount of force and speed

If two objects are pushed with the same force, how does their mass affect their acceleration and the time it takes them to travel a given distance?

The object with more mass will accelerate slower and take more time to travel the same distance

The object with more mass will accelerate faster, taking less time to travel the distance.

The mass does not affect acceleration or travel time as long as the same force is applied.

The object with more mass will travel the same time, but with less speed.

On looking at the image, a student claims that a digital signal is more reliable than an analog signal.

Yes, the output digital signal is less distorted compared to the output analog signal.

No, the input analog signal is less distorted than the input digital signal.

Yes, the input digital signal is less distorted than the input analog signal.

No, these output analog signal is less distorted compared to the output digital signal.

How does a spring scale lifting a load demonstrate the principle of equal and opposite forces?

The spring exerts an equal and opposite force to the force of gravity acting on the object, causing the spring to stretch and raise the object.

The scale pushes the object with a force equal to the object's weight, causing the object to accelerate.

The spring scale only measures the force of gravity on the object, without interacting with the object itself.

The spring scale pulls the object with a force greater than the force of gravity, causing the object to rise.

What is true of this train traveling at a constant speed?

W and Y are balanced because the train moves at a constant speed, and Z is equal to X because the train remains on the tracks.

W and Y are balanced because the train moves at a constant speed and Z is greater than X because the train remains on the tracks.

W is greater than Y since the train is moving forward, and Z is equal to X because the train remains on the tracks.

W is greater than Y since the train is moving forward, and Z must be greater than X because the train remains on the tracks.

How can the strength of an electromagnet be increased? (mark all that apply (3))

increase the current flowing through the coil

Global Positioning Systems (GPS) use electromagnetic waves. Which of the following describes using these waves?

GPS transmits digital radio waves to/from satellites in space

GPS receivers use trilateration to determine locations.

There are 31 satellites in space.

GPS systems use infrared waves to transmit digital signals.

During our lab, a student attached the alligator clip to the plastic wire and then the battery. The electromagnet did not work. Why?

The plastic coating prevented electricity from reaching the wire. Plastic is an insulator.

In order to clip directly to plastic, you need a stronger battery.

The battery needed to be replaced.

The alligator clip should have been attached to the paper clip. Paper clips are conductors.

What is a NON-CONTACT force? Choose TWO.

A push or pull force where the objects are NOT touching

An example would be an object falling to the ground pushed down by gravity.

A push force where the objects ARE touching.

An example would be pulling open a door.

2024 Fall Benchmark Review

Authored by Amy Underwood

Science

8th Grade

NGSS covered

Used 30+ times

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32 questions

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MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What are the components of the electromagnets?

battery, wire and bulb

battery , copper wire and paper clips

battery, copper wire and iron nail

battery, wire and aluminum

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What device is made of coils of wire with an electrical current passing through it in order to generate a magnetic field?

Electromagnet

Generator

Electromagnetic Induction

Electric Motor

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

The image provided is a _________ signal.

Analog

Digital

Tags

NGSS.MS-PS4-3

NGSS.MS-PS4-1

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

The image provided is a _________ signal.

Analog

Digital

Tags

NGSS.MS-PS4-3

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

A more reliable way to transmit and store information is by using _______ signals

Analog

Digital

Tags

NGSS.MS-PS4-3

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What is the Net Force and the direction of the object's movement as a result of the net force?

11N, Right

11N, Left

1N, Left

1N, Right

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

If two objects are thrown at the same angle, which of the following factors will cause one to travel farther?

The object with less mass.

The object thrown with greater force.

The object that is smaller in size.

The object that is larger in size.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

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2024 Fall Benchmark Review

What are the components of the electromagnets?

What device is made of coils of wire with an electrical current passing through it in order to generate a magnetic field?

The image provided is a _________ signal.

The image provided is a _________ signal.

A more reliable way to transmit and store information is by using _______ signals

What is the Net Force and the direction of the object's movement as a result of the net force?

If two objects are thrown at the same angle, which of the following factors will cause one to travel farther?

Which of the following is necessary for sound to travel?

Sound is able to travel faster in solids than in air because the molecules in a solid are

Sound travels slower in __ air because the particles have less energy.

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