science final

What happens when a hot object is placed next to a cold object?

• Heat flows from the hot object to the cold object.

• Heat flows from the cold object to the hot object.

• No heat flow occurs.

• Both objects become hotter.

When you touch a metal spoon left in hot soup, why does it feel hot?

• Heat from the soup flows to the spoon.

• Cold from the air enters the spoon.

• The spoon produces its own heat.

• The soup becomes cold.

Sound cannot travel through matter.

• True

• False

Sound energy travels through a wave. 

• True

• False

A material that allows electric current to flow through it.

• conductor

• insulator

• resistor

A material that does not allow electric current to flow.

• conductor

• insulator

• resistor

It is a device that controls the flow of electricity.

• conductor

• insulator

• resistor

Which diagram shows current flowing through an electric circuit?

• 
• 
• 

Where can we find a resistor?

• in a battery

• in plastic

• wire in a light bulb

• in a switch

Which of the following uses resistors to transform electricity into heat?

• a toaster

• a car engine

• a wind turbine

• solar energy