Science Fest_Preliminary Round

Joe says that the energy in a wind-up toy changes as you wind it up and then let it go. He is explaining conservation of energy as ______________________.

• Energy can be created and destroyed.

  
  

• Energy isn't created or destroyed; it only moves from place to place.

  
  

• Energy can sometimes be created or destroyed.

• Energy can be created, but can't be destroyed.

In most human situations, energy originates from ______.

• The sun

• 1. Photosynthesis

• The moon

• 1. Chemical reactions

Wires carrying electricity are usually covered with plastic to keep them from starting a fire. Why does the plastic keep the electricity from starting a fire?

• Plastic is a good insulator.

• Plastic can melt when heated.

• Plastic is softer than wire.

• Plastic conducts electricity.

Water flows through turbines in dams like the one shown below. The flowing water makes the turbines spin. What type of energy is used to make the turbines spin in this type of dam?

• light energy

• thermal energy

• sound energy

• mechanical energy

What is a natural resource that can be used and replaced over a relatively short period of time?

• Energy Form

• Renewable resource

• Nonrenewable resource

• Natural resource

What is the transfer of heat through matter or space as waves?

• Conduction

• Convection

• Radiation

• Energy

The 3 ways in which the heat energy is transferred are _________, __________ and ___________.

• conduction, radiation, thermal

  
  

• conduction, radiation, convection

  
  

• conduction, convection, nuclear

A campfire is an example of which two forms of energy?

• light and sound

• heat and light

• sound and motion

• motion and electricity

Electrical devices convert electrical energy into sound, light, heat or motion. Tick whether the statement is true or false.

• False

• True

The house here uses panels on the roof to collect a natural resource and convert it into electricity that can be used.
Which alternative energy source does this house use?

• Water

• Wind

  
  

• Solar

• Geothermal