Heat Transfer Review

A pot of water is placed on a stove. The water begins to boil rapidly.

Which explains why the water is boiling faster?

• The cooler water is rising in the pot to replace the warmer water on top through the process of radiation.

• The warm water is rising in the pot to replace the cooler water on top through the process of radiation.

• The warm water is rising in the pot to replace the cooler water on top through the process of convection.

• The cooler water is rising in the pot to replace the warmer water on top through the process of convection.

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Molly notices hot sparks rising from a campfire. She knows the sparks are hot, because they are red. Which best explains the hot sparks rising?

• The sparks are rising due to radiated heat.

• The sparks are rising due to heat being conducted.

• The sparks are rising, and heat rises, proving this is convection.

• The sparks are rising to replace warm air, so the sparks are

  convecting heat.

Which is the best example of convection?

• a camp fire

• a light bulb

• a hot air balloon

• a microwave oven

The area in front of a fire feels warm on a cold evening. What are the processes that cause the person in front of the fire to feel warm?

• conduction and convection

• radiation and conduction

• radiation and convection

• radiation, convection, and conduction

Which best describes the process of conduction?

• When two objects touch, the heat is transferred into the air.

• When two objects touch, the heat from the hotter object is

  transferred to the cooler object.

• When two objects touch, the cool air from the cooler object is

  transferred to the hotter object.

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Which is an example of radiation?

• boiling a pot of noodles for dinner

• getting hot from lying in the sun

• feeling warm while taking a hot shower

• burning yourself after touching a hot plate

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Which of the materials would be the best conductor of heat?

• plastic

• metal

• stone

• wood

Which shows an example of convection?

• Jose cooks an egg on a frying pan

• Clara burns her hand by touching a light bulb.

• Lucy wraps herself in a blanket to keep warm

• Ben holds the end of a metal rod in fire to cook hot dogs

Which color absorbs the most heat?

• red

• white

• black

Which best explains why a blacksmith must heat iron before shaping it?

• Heating iron makes it softer.

• Heating iron makes it harder.

• Heating iron changes its color.

• Heating iron changes its texture.

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