As a nail approaches the south pole of a magnet, what happens to its magnetic domains?

The north poles of the domains point toward the magnet.

The south poles of the domains point toward the magnet.

The domains spin, but end up in no particular pattern.

The domains remain unaffected by the magnet.

What makes an electric motor spin?

The permanent magnet and the electromagnet alternately attract and repel each other.

The permanent magnet and the electromagnet continuously attract each other.

The permanent magnet and the electromagnet continuously repel each other.

The permanent magnet and the electromagnet alternately attract and repel the power source.

How can a wire and a magnet create an electric current?

Either a or b will produce an electric current.

A. The magnet moves inside the coil of wire.

B. The coil of wire moves through a magnetic field.

Neither a nor b will produce an electric current.

A student created an electromagnet out of a piece of copper wire, a nail, and a battery, as shown. The student observed that the electromagnet could not lift paper clips off a desktop as expected. Which hypothesis will most likely help the student build an electromagnet capable of lifting paper clips?

Adding more coils of copper wire to the nail will increase the number of paper clips that the electromagnet can pick up.

Using a wooden stick instead of a nail will increase the number of paper clips that the electromagnet can pick up.

Pushing the coils of copper wire closer together will increase the number of paper clips that the electromagnet can pick up.

Using a battery that produces less electric current will increase the number of paper clips that the electromagnet can pick up.

Which of the following describes both an electromagnet and a permanent magnet?

It has a north pole and a south pole.

The strength of the magnetic force can be controlled.

The magnetic force can be turned off and on.

During an investigation, a teacher places a small permanent magnet with a hole in it onto a wooden rod. The magnet can slide freely up and down the rod. When the teacher places the magnet and rod on a tabletop above an electromagnet, the magnet slides up the rod as shown in the diagram. A student measures how far the magnet slides up the rod each time the teacher adds an additional battery to the electromagnet. Which question could most likely be answered by this investigation?

How does the amount of the electric current affect the distance the magnet travels up the rod?

How does the size of the magnet affect the distance the magnet travels up the rod?

How does the distance between the magnet and the electromagnet affect the strength of the magnetic force of the electromagnet?

How does the direction of the electric current affect the strength of the magnetic force of the electromagnet?

If someone is walking on a moving bus, name two reasonable reference points you might use to describe his or her motion.

The floor of the bus and a tree outside the bus

The ceiling of the bus and the bus driver

A seat on the bus and a car moving beside the bus

The window of the bus and the road outside

During a game of bowling, which of the following describe the ball's motion?

The ball is accelerated while it is pushed by the student's hand due to an unbalanced force.

The ball slows down as it rolls because friction exerts an unbalanced force.

The ball does not change its motion while it is held in the student's hand due to balanced forces.

The ball is accelerated while it is held in the student's hand due to balanced forces.

The ball does not change its motion as it rolls because of the balanced force provided by friction.

Which of the following are ways to decrease the potential energy of a bucket full of water sitting on a bench?

Remove some water from the bucket

A rubber ball is dropped and bounces back up. The ball has __________.

both kinetic and potential energy at C

both kinetic and potential energy at A

A rubber ball is dropped and bounces back up. The ball's potential energy _______.

is the same as its kinetic energy at A

Which best describes the changes in energy as a child goes down a slide?

potential energy decreases and kinetic energy increases

potential energy is constant and kinetic energy increases

potential and kinetic energy are constant

8th grade semester test - spring 2025

Quiz

•

Science

•

8th Grade

•

Practice Problem

•

Easy

•

NGSS

MS-PS3-5, MS-PS2-3, MS-PS2-5

+9

Standards-aligned

Steven Schaffer

Used 12+ times

FREE Resource

45 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

As the amount of charge on either of two charged objects increases, the electric force between the objects decreases.

True

False

Tags

NGSS.MS-PS2-3

2.

DRAG AND DROP QUESTION

30 sec • 1 pt

Two objects will experience an electric force of attraction when they have (a) .

like charges

opposite charges

the same amount of charge

no charge

3.

DRAG AND DROP QUESTION

30 sec • 1 pt

If the distance between two charged objects increases, the electric force between them (a) .

decreases

increases

remains the same

stops

Tags

NGSS.MS-PS2-3

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following statements about the forces between charged objects is not true?

As the distance between charged objects decreases, the electric force between them decreases.

If one object is positively charged and another is negatively charged, the objects will attract each other.

Two negatively charged objects will repel each other.

As the amount of charge on either object decreases, the electric force between them decreases.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The magnetic domain is the area around a magnet where the magnetic force acts.

True

False

Tags

NGSS.MS-PS2-5

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When you bring the south ends of two magnets close together, they repel each other.

True

False

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A current-carrying wire produces a magnetic field.

True

False

Tags

NGSS.HS-PS2-5

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8th grade semester test - spring 2025

45 questions

As the amount of charge on either of two charged objects increases, the electric force between the objects decreases.

Two objects will experience an electric force of attraction when they have (a) .

If the distance between two charged objects increases, the electric force between them (a) .

Which of the following statements about the forces between charged objects is not true?

The magnetic domain is the area around a magnet where the magnetic force acts.

When you bring the south ends of two magnets close together, they repel each other.

A current-carrying wire produces a magnetic field.

The strength of an electromagnet can be increased by reducing the number of turns on the wire coil so that more current can flow.

The more loops in a coil of wire around the core of an electromagnet, the stronger the magnetic force.

As a nail approaches the south pole of a magnet, what happens to its magnetic domains?

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