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- 1. Multiple Choice
Which of the following materials is used to cover electrical wires for safety because it is an insulator of electric energy?
Copper
Aluminum
Iron
Rubber
- 2. Multiple Choice
Students built an incomplete circuit. Which of the following objects could be placed in the space between the wires to complete the circuit and make the bulb light?
A wooden craft stick
Plastic bottle cap
iron paper clip
rubber pencil eraser
- 3. Multiple Choice
Jake is creating a project with an electric circuit. For part of the project, Jake needs an insulator. A good insulator would NOT be made of which of the following?
Plastic
Rubber
Copper
Glass
- 4. Multiple Choice
Electricity will flow in an electric circuit only if the circuit–
has several batteries
makes a complete path
produces light energy
has the right kind of insulators
- 5. Multiple Choice
Students attached a buzzer to a battery with a switch. The buzzer is not making any noise. Which of the following changes would most likely make the buzzer produce sound?
removing the battery
add more wires
using a big buzzer
closing the switch
- 6. Multiple Choice
All of the objects below are conductors of electricity EXCEPT–
- 7. Multiple Choice
Students hooked up a battery and bulb with wires as shown. For the bulb to light, the object the students place in the space between the two wires must be–
a conductor of electricity
made of plastic or wood
at room temperature
an electrical insulator
- 8. Multiple Choice
Elijah places four different materials at the same temperature onto a hot plate to find out which material is the best insulator. The information presented in the table shows the temperature of each material after 15 minutes. Elijah can conclude that which of the following materials is the best insulator?
Material 1
Material 2
Material 3
Material 4
- 9. Multiple Choice
Conductors allow thermal and electrical energy to pass through easily. Insulators prevent the flow of thermal and electrical energy. Which of the following items is a poor conductor and a good insulator?
Silver
Wood
Tin
Copper
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