IS G4 Unit 9-10

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

• negative

• positive

• neutral

During a storm, Lia 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 Lia 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

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.

• Opposite charges make one balloon become larger and one become smaller.

• They neither attract nor repel one another.

• They attract one another.

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

• 
• 
• 
• 

Carlos wanted to know how positive and negative charges affect balloons. The balloons shown are part of his investigation. How could Carlos cause the balloons to attract one another and stick together?

• Give them both a negative charge.

• Give them both a positive charge.

• Give only one of them a positive or negative charge.

• Remove any positive or negative charge from both balloons.

Sidney wants to make an electric circuit. She gathers a light bulb, wire and a paper clip. What additional item MUST Sidney have to make a complete circuit?

• a battery

• a switch

• an insulator

• a conductor

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

• It would be duller.

• It would be brighter.

• It would stop glowing.

• It would start glowing.

Courtney wants to know if a wooden craft stick can be used to close a circuit that turns on a light bulb. Which observation would show that wood does not conduct electricity?

• The bulb lights for a short time and then goes out.

• The bulb remains unlit.

• The bulb lights brightly.

• The bulb flickers on and off.

The electric circuit below consists of a battery, a switch, and three light bulbs. What type of circuit is shown in the diagram?

• Closed circuit

• Series circuit

• Magnetic circuit

• Parallel circuit

The plastic coating was stripped off the end of the piece of wire shown. Why must the plastic be removed before this wire is used in an electric circuit?

• so the wire can be bent and fit into the circuit

• to prevent the circuit from becoming overloaded

• because the plastic makes 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