Science- Electricity, Sound & Light

Dry air, cardboard, glass, rubber, and wood can be classified as:

• insulators because free electron flow is hindered by the structure of the material.

• conductors because electrons can move freely from one atom to another creating a current.

• superconductors because they provide no resistance to electron flow through the material.

• semiconductors because electron movement is dependent on the conditions - such as temperature and voltage.

Aluminum foil, cast iron pans, copper pipes, graphite, and sea water can be classified as:

• A) insulators because free electron flow is hindered by the structure of the material.

• B) conductors because electrons can move freely from one atom to another creating a current.

• C) superconductors because they provide no resistance to electron flow through the material.

• D) semiconductors because electron movement is dependent on the conditions - such as temperature and voltage.

Insulators are materials that stop the flow of electricity. Which of these is an example of an insulator?

• nail

• metal staple

• crayon

• paper clip

Ron is dreading setting up the Christmas tree because the lights are always a hassle. There is always at least one strand of lights that has a bulb out that prevents the string from lighting because the broken bulb breaks the circuit. He must test all the bulbs to determine which bulb is damaged and replace it before the light strand will work properly. If his lights were wired as a (a)   circuit instead of a (b)   circuit he could avoid this headache.

• parallel
• sequel
• multiple

• progression

• series

Lightning is an electrical discharge between the clouds and the ground. Lightning is an example of

• magnetism

• open circuit

• static electricity

• parallel connection

Which situation provides the BEST example of static electricity?

• A fork is inserted into the open end of a light socket.

• A copper wire is attached from the battery terminal to the light bulb.

• A sweater and a shirt are stuck together when they are pulled from the clothes dryer.

• A strong magnet is used to remove all of the iron fillings out of a cup filled with white rice.

Which household item turns electrical energy into radiant energy?

• Speakers

• Toaster

• Lamp

• Fan

Jenny is cooking a hot dog over the campfire. What process is taking place?

• Heat energy is transferring from the fire to the hot dog.

• Wind energy is transferring from the fire to the hot dog.

• Light energy is transferring from the fire to the hot dog.

• Solar energy is transferring from the fire to the hot dog.

The image shows an electromagnet. How could you increase the strength of an electromagnet?

• Use more coils around the nail

• Use a smaller nail.

• Use a battery with less voltage.

• Use fewer coils of wire around the nail.

Which string will make the lowest pitch when plucked with a finger?

• string A

• string B

• string C

• string D