Science Review

Which part of a circuit starts and stops the flow of electric current?

• battery

• lightbulb

• wire

• switch

Which of these will the south pole of a bar magnet repel?

• a paper clip

• the north pole of another magnet

• the south pole of another magnet

• an iron nail

Electric current does NOT flow in

• an open circuit

• a closed circuit

• an electromagnet

• a complete circuit

Which type of material DOES NOT allow electric current to flow through it?

• an insulator

• a magnet

• a conductor

• Mr. Wellborn's Big Coke

Which material could a bar magnet separate from the rest of the mixture?

• sand

• sugar

• aluminum scraps

• iron filings

Water freezing is an example of a...

• physical change

• chemical change

• photosynthesis

• magnet

MJ measures the mass of milk and puts it in the freezer. What will happen to the mass of milk?

• it will increase

• it will stay the same

• it will decrease

• it will not be able to be measured.

Which material is a conductor?

• wood

• glass

• rubber

• aluminum

Which of these is a way to make an electromagnet stronger?

• increasing the electric current flowing through the wire

• replacing the iron core with a copper core

• replacing the copper wire with plastic wire

• wrapping the wire around the iron core fewer times

How are a bar magnet and an electromagnet the same?

• Thye both can be turned on and off

• They both have two opposite poles

• They both have the same shape

• They both need electric current