Quiz about 24-25 Magnetism Review

Question 1

The image below is an example of a _______________ because ...

Accepted Answer

permanent magnet; the magnetic domains all lign up.

Accepted Answer

temporary magnet; the atoms in the domain and the domains are all in align

Answer

non-magnetic material; the individual atoms do not lign up.

Answer

temporary magnet; the atoms in the domain are aligned, but the domains are not.

Question 2

If the south pole of a magnet is brought near the south pole of another magnet, what would happen?

Accepted Answer

They would repel each other.

Answer

They would be attracted to each other.

Answer

There wouldn't be any magnetic force.

Answer

They would cancel each other out.

Question 3

What particles are responsible for the formation of magnetic poles?

Accepted Answer

Electrons

Answer

Protons

Answer

Neutrons

Question 4

Two magnets are of equal magnetic force (strength).  In which position will the magnets have the GREATEST ATTRACTIVE force toward each other?

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

D.

Question 5

Which of the following magnetic fields is correct for a single bar magnet?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Question 6

A bar magnet is placed on a table, and a sheet of blank paper is placed over a magnet.  If you sprinkled iron filings on the paper, what would it show you?

Accepted Answer

Shape of the magnetic field

Answer

Strength of the magnetic field

Answer

Number of electrons in motion in the current

Answer

Strength of the current forming the magnet

Question 7

The image below is an example of a _______________ because ...

Accepted Answer

non-magnetic material; the individual atoms do not line up.

Answer

permanent magnet; the magnetic domains all lign up.

Answer

temporary magnet; the atoms in the domain and the domains are all in align

Answer

temporary magnet; the atoms in the domain are aligned, but the domains are not.

Question 8

Earth's magnetic field is caused by.. .

Accepted Answer

a molten outer core of iron and nickel

Answer

a molten outer core of iron and aluminum

Answer

metallic elements on the earth's surface

Answer

a molten inner core of iron and nickel

Question 9

Which physicist discovered that a magnetic field is formed around a current carrying wire/conductor?

Accepted Answer

Hans Oersted

Answer

Thomas Edison

Answer

Nikola Tesla

Answer

Albert Einstein

Question 10

Which option best describes the direction of the magnetic field lines around a magnet?

Accepted Answer

start at north pole, end at south pole

Answer

start at center, end at each pole

Answer

start at each pole, end at center

Answer

start at south pole, end at north pole

Question 11

As you bring a compass near a current carrying wire the needle will...

Accepted Answer

Move due to a force being applied on the needle from the wire's magnetic field

Answer

Not be altered because it is only altered by non live wires

Answer

Move due to a force of gravity being applied

Answer

Not move because the compass must touch the wire to be affected

Question 12

What is the purpose of a commutator in an electric motor?

Accepted Answer

it reverses the direction of the current

Answer

it decreases the current in the coil

Answer

it reverses the poles of the permanent magnet

Answer

it weakens the field of the permanent magnet

Question 13

The area of a magnet that is strongest is...

Accepted Answer

at the poles.

Answer

in the center

Answer

all areas are equally strong

Question 14

Which is NOT a property of an electromagnet?

Accepted Answer

The poles cannot be reversed

Answer

Magnetic field can be turned off and on

Answer

Strength of the magnet can be controlled by adding or subtracting loops

Answer

The poles can be reversed by changing the direction of the current

Question 15

If you were to pick up magnetic material on a magnet, on which part of the magnet would you be able to get the most material collected...AND...why?

Accepted Answer

at both poles; because the magnetic force is stronger at the poles

Answer

the center of the magnet; because the middle is the strongest

Answer

it would be equally distributed; because the entire magnet is made of the same material

Answer

the northern pole of the magnet; because the northern end has the greatest magnetic force

Question 16

What causes a magnetic field to form in an electromagnet? (Read answers carefully)

Accepted Answer

d. both a and c

Answer

a. movement of electrons

Answer

b. protons and electrons exchanging places

Answer

c. electric current in a wire

Question 17

What characteristics do magnetic substances have?

Accepted Answer

They can push or pull objects without touching them

Answer

They can give you a "shock" when you touch them

Answer

They are always iron and cold to touch

Answer

They fall faster than other objects when you drop them

Question 18

An electromagnet is a type of a/an _______________________.

Accepted Answer

temporary magnet

Answer

electrical circuit

Answer

horseshoe magnet

Answer

cobalt magnet

Question 19

From looking at the domains of this material, you can determine that the material is...

Accepted Answer

a temporary magnet

Answer

not magnetic material

Answer

a permanent magnet

Question 20

A material is a permanent magnet when...

Accepted Answer

the atoms in the domains AND the domains all line up.

Answer

the atoms line up.

Answer

the electrons move.

Answer

neither the atoms nor the domains line up.

Question 21

What is the function of the object below?

Accepted Answer

Convert mechanical energy into electrical energy

Answer

Convert electrical energy into mechanical energy

Answer

Increase strength of the electromagnet

Answer

Store electrical energy

Question 22

The direction of a magnetic field around a current carrying wire is: (Choose the most accurate answer.)

Accepted Answer

circular around the wire and counter clockwise to the direction of the current

Answer

circular around the wire

Answer

circular around the wire and clockwise to the direction of the current

Answer

opposite to the direction of current flow

Question 23

Which of the following is NOT a Ferromagnetic Element?

Accepted Answer

Zinc

Answer

Iron

Answer

Nickel

Answer

Cobalt

Question 24

An electric motor continues to spin when the temporary (electromagnet) inside it reverses poles.  This happens when...

Accepted Answer

electric current is rapidly reversed

Answer

current is turned off and on rapidly

Answer

more coils are added

Answer

the current is increased

Question 25

When current is reversed in a wire, it causes the magnetic field to...

Accepted Answer

change direction

Answer

stop

Answer

speed up

Answer

become stronger

Question 26

The lines in the image below represent

Accepted Answer

the magnetic field around a magnet

Answer

electricity flowing in an object

Answer

the movement of electrons

Question 27

If the south pole of a magnet is brought near the north pole of another magnet, what would happen?

Accepted Answer

They would be attracted to each other.

Answer

They would repel each other.

Answer

There wouldn't be any magnetic force.

Answer

They would cancel each other out.

Question 28

The difference between a permanent and temporary magnet is...

Accepted Answer

D. both A and B

Answer

A.  temporary magnet loses its charge.

Answer

B. a permanent magnet has both the atoms in its domain and the domains themselves aligned.

Answer

C. a temporary magnet is made of elements like aluminum.

Question 29

An electric current that flows in one direction is

Accepted Answer

direct current

Answer

a permanent magnet

Answer

an electric motor

Answer

alternating current

Question 30

When you _____________ the current flowing through a wire, you _____________ the magnetic field.

Accepted Answer

increase; increase

Answer

increase; decrease

Answer

decrease; increase

Answer

none of the above

Question 31

How can the strength of an electromagnet be increased?

Accepted Answer

D. both A and B

Answer

A. increase the electric current in the coil

Answer

B. increase the number of loops in the coil around the material

Answer

C. use a material with more aluminum

Answer

E. both B and C

Question 32

One electromagnet has a wood core. The other has an iron core. Which is true?

Accepted Answer

The iron core is stronger because it is a ferromagnetic material.

Answer

The wood core is stronger because it is a ferromagnetic material.

Answer

The iron core is stronger because it is not a ferromagnetic material.

Answer

The wood core is stronger because it is not a ferromagnetic material.

Question 33

According to the graph below, the electromagnet showed the greatest increase of strength when the number of coils changed from _________  to _________

Accepted Answer

25 to 30

Answer

10 to 15

Answer

15 to 20

Answer

20 to 25

Question 34

A step-up transformer has __________ number of loops on the primary coil and _________ number of loops on the secondary coil.

Accepted Answer

fewer; greater

Answer

greater ; fewer

Answer

greater; same

Answer

fewer; same

Question 35

A step-down transformer ___________ the output voltage and step-up transformer __________ the output voltage.

Accepted Answer

decreases; increases

Answer

increases ; decreases

Answer

decreases; decreases

Answer

increases; increases

Question 36

The image below is an example of a ............

Accepted Answer

step up transformer because the primary coils are less than the secondary coils and the voltage will increase.

Answer

step down transformer because the primary coils are less than the secondary coils and it will increase the voltage

Answer

step down transformer because the primary coils are more than the secondary coils and it will decrease the voltage.

Answer

step up transformer because the secondary coils are more than the primary coils and the voltage will decrease.

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science