P.10.4

Which of the following statements about heat energy is true?

• Heat usually flows from colder to warmer objects.

• Heat is attracted to solid objects more than gases.

• Heat is attracted to liquids less often than solids.

• Heat flow can cause materials to change temperature.

Which of these materials would be the best insulator?

• aluminum

• glass

• gold

• silver

When Derrick plugs in his bedroom lamp he notices that the wire is covered with plastic. Why does the wire have a plastic covering?

• The plastic converts the electricity to thermal energy.

• The plastic helps conduct the electricity to light the lamp.

• The plastic is an insulator to protect people from the electricity.

• The plastic is used to protect the copper wire underneath, which is very expensive.

When a radio is turned on, what energy transformation occurs?

• Heat energy is changed to light energy.

• Kinetic energy is changed to sound energy.

• Electrical energy is changed to sound energy.

• Chemical energy is changed to mechanical energy.

What purpose do batteries have in an electrical circuit?

• They absorb the thermal energy.

• They store light energy for later use.

• They convert chemical energy to electrical energy.

• They convert solar energy to usable kinetic energy.

Heat flows in which direction?

• from solid objects to liquids

• from larger objects to smaller objects

• from warmer objects to cooler objects

• from more dense objects to less dense objects

Which of the following materials would be a poor conductor of electricity?

• aluminum

• rubber

• copper

• steel

Fireworks convert chemical energy into which of the following kinds of energy?

• solar energy and sound energy

• thermal energy and light energy

• electrical energy and light energy

• nuclear energy and kinetic energy

Megan wants to determine if an electrical circuit has electricity flowing through it. Which of the following evidence is proof that the circuit has an electrical current?

• The circuit is a closed loop.

• A light bulb is lit in the circuit.

• The circuit's switch is in the closed position.

• Wires in the circuit are made of conducting material.

Which of the following lists the forms of energy that electricity can be transformed into?

• heat, mechanical, light, and sound energy

• chemical, heat, light, and solar energy

• heat, mechanical, nuclear, and sound energy

• gravitational, mechanical, solar, and sound energy