1

Free Preview

Jill uses a magnet to pick up a nail. Then, she touches the nail to a paper clip and picks up the paper clip. What will most likely happen when she pulls the magnet away from the nail?

A

The paper clip will stay attached to the nail because the nail is now a permanent magnet.

B

The paper clip will stay attached to the nail because the paper clip is now a permanent magnet.

C

The paper clip will fall off of the nail because the nail was only a temporary magnet.

D

The paper clip will fall off of the nail because the nail is now magnetized in the opposite direction.

2

Free Preview

A bar magnet and a second object are hung from metal rods. The diagram below shows what happens when both objects are released.

A

an iron bar

B

a steel bar

C

a bar magnet with its north pole on the left

D

a bar magnet with its south pole on the left

3

Mr. Garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is

A

iron.

B

carbon.

C

plastic.

D

glass.

4

The diagram shows the field lines near the poles, X and Y, of two magnets.

A

X: northY: south

B

X: southY: north

C

X: northY: north

D

X: southY: south

5

Two bar magnets are hung from metal rods and held in the position shown below. The magnets are released and swing freely. Which diagram best predicts their final position?

A

A rectangular box with 2 black lines running down from it, each to a horizontal bar magnet labeled N to the left and S to the right. There is a gap between the magnets. The magnets are both hanging to the left.

B

A rectangular box with 2 black lines running down from it, each to a horizontal bar magnet labeled N to the left and S to the right. There is a gap between the magnets. The left magnet hangs to the left. The right magnet hangs to the right.

C

A rectangular box with 2 black lines running down from it, each to a horizontal bar magnet labeled N to the left and S to the right. There is a gap between the magnets. The left magnet hangs to the right. The right magnet hangs to the left.

D

A rectangular box with 2 black lines running down from it, each to a horizontal bar magnet labeled N to the left and S to the right. There is a gap between the magnets. The left magnet hangs straight down. The right magnet hangs to the right.

6

A compass taken to Earth’s moon does not point in a specific direction on the moon. What is the most likely reason for the difference between how the compass works on Earth and on the moon?

A

The moon lacks an atmosphere.

B

The moon contains no rocks that have iron.

C

The moon does not have a strong magnetic field.

D

The moon has no bodies of water.

7

Which statement about Earth’s core helps explain Earth’s magnetic field?

A

Earth’s core is composed of magnets.

B

Earth’s core is composed of iron and nickel.

C

The outer core is solid.

D

The inner core is liquid and moving.

8

Joe follows the procedure below to make a compass.1. Move a magnet from the top of a needle to its point fifty times.2. Lay the needle on a cork that is floating in a bowl of water.3. Observe the direction that the needle points.

A

to give the needle an electric charge

B

to make the needle sharper

C

to magnetize the needle

D

to flatten the side of the needle

9

Which element is magnetic?

A

calcium

B

copper

C

carbon

D

cobalt

10

Which refers to the ends of a magnet where the forces are strongest?

A

attracting forces

B

opposing forces

C

magnetic fields

D

magnetic poles

Test — Unit test Answers

More from this Course

TRY EDGENUITY HACKS