Science Quiz

Vacuum cords are coated with rubber or plastic coating to protect people from the electricity that runs through the cord. Why is this?

• Rubber is easy to handle.

• Rubber is an electric insulator.

• Rubber looks pretty.

• Rubber is an electric conductor.

Charlotte is doing a science project to find out what materials complete the circuit shown below to make the bell ring. She closed the circuit with a plastic pen cap and then a wooden craft stick.

• The plastic and the wood have too much power.

• The plastic and the wood are conductors.

• The plastic and the wood are insulators.

• The plastic and the wood were wet.

A scientist in a lab would like to determine if an object conducts electricity. Which of the following experiments would test this?

• Place the object on a source of heat, and measure the time it takes to heat up.

• Weigh the object before and after refrigeration.

• Include the object in a circuit, and check to see if the circuit still works.

• Float the object in water.

Eva constructed the device shown below to test whether certain objects can conduct electricity. Eva touched a particular object to both metal terminals at the same time. The light bulb did not light up. What is most likely true about the object?

• It was an insulator.

• It had static electricity.

• It was a conductor.

• It produced electricity.

Mrs. Gray's class has built an electrical circuit. They need to complete the circuit by adding an object that will allow electricity to flow through it easily. One student suggests that they use plastic. Will the student's suggestion work?

• No. Plastic is a conductor.

• Yes. Plastic is an insulator.

• Yes. Plastic is a conductor.

• No. Plastic is an insulator.

Which of the following materials is the best conductor of electricity?

• rubber

• plastic

• wood

• iron

Select the name of each electrical insulator from the table.

• paper clip

• rubber band

• nail

• glass rod

Objects that conduct electricity can easily carry an electrical charge. Which of the following materials best conducts electricity?

• copper wire

• cotton string

• plastic tubing

• rubber sheets

Which of the following materials is a good conductor of electricity?

• cloth

• glass

• silver

• rubber

Objects that stop the flow of electricity are good insulators. Which of the following materials would be the best insulator for an electrical wire?

• plastic tubing

• aluminum pipes

• copper wire

• water