Quiz about Electricity and Magnetism

Question 1

What causes the poles of the electromagnet in an audio speaker to repeatedly switch directions?

Accepted Answer

a current that rapidly switches direction

Answer

a metal striker that pulls on the magnet

Answer

a diaphragm that vibrates around the magnet

Answer

a device that opens and closes a circuit

Question 2

Which would ultimately cause the armature in an electric motor to spin?

Accepted Answer

The current in the armature is reversed.

Answer

The current in the armature stops.

Answer

The gap in the commutator closes.

Answer

The commutator loses contact with the brushes.

Question 3

Which parts of an electric generator are connected?

Accepted Answer

the armature and axle

Answer

two brushes

Answer

two slip rings

Answer

the armature and commutator

Question 4

Beth made the chart shown.

Which headings best complete the chart?

Accepted Answer

X: Use DC Y: Use AC

Answer

X: Use AC Y: Use DC

Answer

X: Powered by Current Y: Powered by Magnetism

Answer

X: Powered by Magnetism Y: Powered by Current

Question 5

The diagram shows a coiled wire that carries an electrical current.

What do the arrows represent?

Accepted Answer

the magnetic field

Answer

thermal energy

Answer

light energy

Answer

the electric field

Question 6

Georgia moves an unattached piece of wire back and forth over a magnet. Which best explains what will happen?

Accepted Answer

A current will not be induced because the wire is not part of a closed circuit.

Answer

A current will be induced because the wire moves through a magnetic field.

Answer

A current will not be induced because the wire moves through a magnetic field.

Answer

A current will be induced because the wire is not part of a closed circuit.

Question 7

Frances drew a diagram to show electromagnetic induction.

Which label belongs in the area marked X?

Accepted Answer

Magnetic field

Answer

Current

Answer

Solenoid

Answer

Force on wire

Question 8

What happens to an iron bar when it is placed within the coils of a solenoid?

Accepted Answer

It becomes a magnet.

Answer

It induces a current.

Answer

It stops the current.

Answer

It loses its magnetism.

Question 9

An object that is made of which material is likely to be attracted to a magnet?

Accepted Answer

iron

Answer

nitrogen

Answer

paper

Answer

plastic

Question 10

Which shows the pieces after the magnet is cut?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 11

How are the magnetic field lines near the south pole of a magnet affected when a second south pole is brought near it?

Accepted Answer

The field lines bend away from the second south pole.

Answer

The field lines combine with the lines around the second south pole.

Answer

The field lines overlap with the lines from the second south pole.

Answer

The field lines bend toward the second south pole.

Question 12

Which device manages the flow of current in an electric circuit?

Accepted Answer

the switch

Answer

the wire

Answer

the battery

Answer

the light bulb

Question 13

Mateo makes a table of the symbols that represent the parts of an electric circuit.

What label should Mateo place in the marked cell?

Accepted Answer

Provides electrical energy

Answer

Uses electrical energy

Answer

Measures electric current

Answer

Controls electric current

Question 14

In a movie, a character cuts a wire, which stops the countdown timer of a bomb. What does cutting the wire do to the circuit?

Accepted Answer

It opens the circuit so that electric charges do not flow to the timer.

Answer

It opens the circuit so that electric charges flow to the timer.

Answer

It closes the circuit so that electric charges do not flow to the timer.

Answer

It closes the circuit so that electric charges flow to the timer.

Question 15

What is an advantage of series circuits?

Accepted Answer

Adding more batteries will increase the current.

Answer

There is more than one path for charges to flow.

Answer

If one bulb goes out, the other bulbs still shine.

Answer

Light bulbs get dimmer as more bulbs are added.

Question 16

What is required for an electric charge to flow through a wire?

Accepted Answer

a difference in electric potential

Answer

zero resistance in the wire

Answer

a balance of electric potential

Answer

high resistance in the wire

Question 17

Potential difference is measured in which units?

Accepted Answer

volts

Answer

amps

Answer

currents

Answer

watts

Question 18

Nina is working with electricity and shortens the wires through which the current is flowing. What is Nina most likely trying to accomplish?

Accepted Answer

decrease resistance

Answer

convert electric energy to heat

Answer

convert electric energy to light

Answer

increase resistance

Question 19

Which will a positively charged object attract?

Accepted Answer

an object that has a negative charge

Answer

an object that has a smaller positive charge

Answer

an object that has no charge

Answer

an object that has a larger positive charge

Question 20

Tisa makes a diagram to organize her notes about charging objects.

Which statement should she place in the region marked X?

Accepted Answer

Electrons move between objects.

Answer

The objects do not touch.

Answer

The objects develop opposite charges.

Answer

The objects have the same charge.

Question 21

How does increasing the distance between charged objects affect the electric force between them?

Accepted Answer

The electric force decreases because the distance has an indirect relationship to the force.

Answer

The electric force increases because the distance has an indirect relationship to the force.

Answer

The electric force increases because the distance has a direct relationship to the force.

Answer

The electric force decreases because the distance has a direct relationship to the force.

Question 22

The image shows the electric field lines around two charged particles.

At which position would the electric force be greatest?

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 23

What happens when someone lets go of the button on an electric doorbell?

Accepted Answer

The circuit is broken and the electromagnet turns off.

Answer

The electromagnet gets stronger.

Answer

The current moving through the circuit changes direction.

Answer

The metal striker hits the bell.

Question 24

Lisa made the electromagnet shown.

What can Lisa do to increase the strength of the electromagnet?

Accepted Answer

She can move the wire loops closer together.

Answer

She can use a nail with weaker magnetic properties.

Answer

She can change the direction of the nail.

Answer

She can reduce the number of wire loops.

Question 25

A magnet placed against the wall of a metal shed falls to the ground, where it attracts a nail. What is the most likely explanation for this observation?

Accepted Answer

The shed is not made of iron or steel.

Answer

The wall is the opposite pole from the magnet.

Answer

The magnet is not magnetized.

Answer

The nail pulled the magnet to the ground.

Question 26

The field lines around one end of a bar magnet are shown below.

Based on the diagram, what can you conclude about the pole of the magnet?

Accepted Answer

It is a south pole because the field lines enter the magnet at this end.

Answer

It is a south pole because the field lines spread out from this end.

Answer

It is a north pole because the field lines spread out from this end.

Answer

It is a north pole because the field lines enter the magnet at this end.

Question 27

A circuit is a path along which electric current flows. How would changing the battery in a circuit from 9 volts to 1.5 volts most likely affect the circuit?

Accepted Answer

Less electric charge would flow in the circuit.

Answer

More electric charge would flow in the circuit.

Answer

The resistance in the circuit would decrease.

Answer

The resistance in the circuit would increase.

Question 28

Assuming a current is flowing, what increases the strength of the magnetic field of a coiled electrical wire?

Accepted Answer

adding more coils to the wire

Answer

straightening the wire

Answer

changing the direction of the current flow

Answer

stopping the current

Question 29

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

Based on the field lines, what are the poles of the magnets?

Accepted Answer

X: north

Y: north

Answer

X: north

Y: south

Answer

X: south

Y: north

Answer

X: south

Y: south

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science