Electricity and Magnetism Unit Test Review

A proton has a positive charge. What is the charge of a particle that is attracted to a proton?

• negative
• neutral
• positive
• repulsive

During a storm, Leah saw a flash of lightning hit a tree. Later, she observed that the lightning left a burn mark on the tree. Which of the following best describes what Leah can infer from what she saw?

• Static electricity can build up when water droplets rub against each other.
• Electrical energy can be transformed into light and produce heat.
• atoms usually have a neutral charge but can build up a positive or negative charge.
• electric current flows steadily along a path.

Suppose you rub a balloon on your hair on a dry day. Your hair is attracted to the balloon. Then, you bring the balloon near another balloon that has not been rubbed. How would you describe what happens to the two balloons?

• They repel one another.
• They attract one another.
• They neither attract nor repel one another.
• Opposite charges make one balloon become larger and one become smaller.

The pictures show objects that are charged and objects that are not charged. which shows two objects with the same charge?

• A
• B
• C
• D

What additional item is needed to make a complete circuit?

• battery
• switch
• insulator
• conductor

Alex makes an electric circuit that has a switch as one of its parts. The diagram below shows the circuit that he makes. What would happen if Alex changed the switch from closed to open?

• It would be duller.
• It would be brighter.
• It would stop glowing.
• It would start glowing.

Which of the following items would work best to complete a circuit?

• metal coin
• glass bead
• plastic straw
• wooden toothpick

What happens to lightbulbs A and C if B burns out?

• Both bulbs A and C will go out.
• Bulb A will go out, but bulb C will stay lit.
• Bulb C will go out, but bulb A will stay lit.
• Both bulbs A and C will stay lit.

• So the wire can be bent and fit into the circuit.
• to prevent the circuit from becoming overloaded
• because the plastic make the wire too thick to use in a circuit
• so that electric current can pass between the copper wire and other parts of the circuit

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