Magnetism & Electricity Practice Test

Which statement explains why increasing the number of coils made the electromagnet stronger than increasing the diameter of the coils?

• Increasing the number of coils provides a greater distance along the wire for the current to travel.

• Increasing the number of coils increases the amount of magnetic force generated by the electromagnet.

• Increasing the diameter of the coils causes the electrons to travel farther which decreases the magnetic field generated by the electromagnet.

• Increasing the diameter of the coils increases the number of turns in the coil, decreasing the magnetic field strength generated by the electromagnet.

Which of the following would make the wire coil spin faster?

• remove one magnet

• decrease the battery voltage

• increase the number of loops in the wire coil

• increase the distance between the magnets and the wire coil

Tags

NGSS.MS-PS2-3

During a lab investigation students touched an uncharged piece of metal with a positively charged glass rod. Which method was the electric charge transferred by?

• conduction

• induction

• insulation

• static electricity

What can the students do to make the electromagnet stronger?

• Increase the thickness of wire used.

• Replace the iron nail with a smaller iron nail.

• Decrease the number of turns in the wire coil.

• Replace the battery with a higher voltage battery.

Tags

NGSS.MS-ETS1-2

NGSS.MS-PS2-3

Which of the following will cause the paper clips to fall off the iron rod?

• Increase the current flow through the circuit

• Switch on the circuit to start the current flow

• Increase the copper wiring around the iron rod

• Switch off the circuit to stop the electric current

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

You and your sister both have a small camping tent set up in the backyard. You each have two strings of lights to hang inside the tent. You power your lights with a 9-volt battery and your sister uses an extension cord and powers her lights from an electrical outlet on the deck. What is the BEST conclusion you can make about this situation?

• Your lights shine the brightest because your battery produces less power.

• Your lights shine the brightest because your battery produces more power.

• Your sister’s lights shine the brightest because the electrical outlet has less power.

• Your sister’s lights shine the brightest because the electrical outlet has more power.

Which of the following arguments explains why astronauts weigh less when they are on the moon?

• The moon has one third of the gravity of the Earth.

• The moon has a greater gravitational pull than Earth.

• Astronauts have less mass on the moon.

• Astronauts have more mass on the moon.

Tags

NGSS.MS-PS2-4

Isabella was standing directly below a power line, and her compass failed to give an accurate reading. How could she explain why her compass was not working?

• A compass works with a magnetic field, and the electric current running through the lines above it would interfere with the magnetic field.

• The compass works because of an electric field, and the electric current running through the lines above would interfere with the electric field.

• The compass works because of a gravitational field, and the magnetic current running through the lines above would interfere with the gravitational field.

• A compass works because of a magnetic field, and the electric current running through the power lines above it would interfere with the magnetic field below it.

Tags

NGSS.MS-PS2-5

When combing one's hair, the comb becomes positively charged. What happens to the hair being combed?

• It stays uncharged.

• It becomes positively charged.

• It becomes negatively charged.

• It loses electrons.

What determines how an object is classified as a conductor or an insulator?

• The movement of protons within the object.

• The movement of electrons within the object.

• The movement of neutrons within the object.

• The movement of atoms within the object.

Tags

NGSS.MS-PS2-3