Heat Transfer

Which material would be the best choice for a cooking tool to be used when grilling food over a fire?

• metal

• plastic

• glass

• wood

A boy touches a stove and gets burned. What transfer of heat caused his hand to get burned?

• radiation

• conduction

• convection

• combustion

Handles on metal pans are often coated with plastic. What is the most likely reason for this?

• Plastic is a good conductor of heat.

• Metal is a poor conductor of heat.

• Plastic is a poor conductor of heat.

• Metal and plastic are good conductors of heat.

How is heat transferred in conduction?

• through solids

• through liquids

• through air

• through space

Which best explains how convected heat causes a hot air balloon to stay in the air?

• The heat is falling and replacing cooler air.

• The heat is produced from the rising of air currents.

• The heat is absorbed through the balloon from the sun.

• The heat is rising and circulating, causing the balloon to stay up in

  the air.

When Julie was cooking macaroni she noticed that it would rise to the top of the boiling water and then sink back to the bottom of the pot. This is most likely because

• The convection of heat within the water was creating a current.

• The convection of air around the pot was creating a current.

• The conduction of heat within the water was creating a current.

• The conduction of air around the pot was creating a current.

Which is the best example of conduction?

• boiling a pot of water

• feeling heat from a fireplace

• a hot air balloon rising and falling

• touching a hot handle and getting burned

Miguel is packing popsicles for a picnic. In which type of container would it be best for Miguel to store his popsicles?

• copper

• paper

• plastic

• aluminum

Which statement best explains why engineers leave space between sections when building a bridge?

• A bridge without spaces will expand during a hot day and possibly

  crack.

• A bridge without spaces will expand during a cold day and possibly

  crack.

• A bridge without spaces will contract during a hot day and possibly

  crack.

• A bridge without spaces will contract during a cold day and possibly

  crack.

Which best describes the purpose of the metal coils inside an oven?

• Metal heats easily, allowing for food to be cooked.

• Metal cools quickly, allowing for food to cool down.

• Metal absorbs heat from the food, which cools food down once it is

  cooked.

• Metal absorbs heat from the food, which keeps the food warm once it is cooked.