CBA 4 review

Two electrically opposite charges are separated by a fixed distance. Which action will provide the greatest increase in the force of attraction between the charges?

• Double each charge and halve the distance between the charges.

• Double each charge and double the distance between the charges.

• Halve each charge and double the distance between the charges.

• Halve each charge and halve the distance between the charges.

Which force holds protons together within the nucleus of the oxygen atom in a water molecule?

• electromagnetic force

• gravitational force

• strong force

• weak force

How can you tell a conductor from an insulator?

• the rate that neutrons travel through the material

• the ease of flow of electrons through the material

• he amount of neutrons present

• the amount of electrons present

A bar magnet was moved quickly back and forth in a coil of copper wire. The ends of the wire were connected to a small lightbulb. Which of the following was the device created for?

• to transfer protons to the lightbulb

• to heat the copper wire

• to increase the strength of the magnet

• to generate an electric current

Which of the following would make the best insulator against the flow of electricity?

• copper wire

• steel tubing

• aluminum foil

• plastic tape

As waves travel from the left through the barrier, they produce a pattern on the right side. What phenomenon of waves causes this pattern to occur?

• The waves interfere with one another constructively and destructively.

• The waves refract as they travel through the openings.

• The waves reflect back and forth as they travel through the openings.

• The waves change in frequency when they meet one another.

Four household appliances (blender, mixer, toaster, and food processor) are plugged into four outlets along a counter. Turning on or off one or more of the appliances does not affect the performance of the other appliances because ... ?

• run on a direct current.

• are connected in series.

• run on an alternating current.

• are connected in parallel

• 1.7 A

• 1.6 A

• 0.63 A

• 9,000A

Which of these forces is long ranged and both repelling and attractive?

• gravitational

• electromagnetic

• nuclear

• functional

Which of the following is a common application of radioactivity?

• cooking with a microwave oven

• keeping food warm with infrared lights

• using an industrial laser to cut through steel

• producing electricity at a nuclear power plant