Heat Transfer, Changes, and the Water Cycle

Bill stands in a swimming pool and notices that the water around his feet is a lot cooler than the water near the surface. Which process causes this difference in temperature?

• conduction
• convection
• radiation
• evaporation

A dark colored wall becomes warm when the Sun is shining on it. After the Sun sets, a person standing a meter away can feel warmth from the wall. How does heat transfer from the wall to the person?

• conduction
• convection
• radiation
• transpiration

Tina is boiling water in a metal pot for a weather experiment. What is most likely the reason she would need to use a pot holder for moving the metal pot?

• Radiation causes the pot to be hot.
• Conduction causes the pot to be hot.
• Convection causes the pot to be hot.
• Transpiration causes the pot to be hot.

Which best exemplifies how heat is transferred by radiation?

• sand becoming hot in the sunlight
• metal handle on a pan becoming hot
• metal ice rack thawing in the refrigerator
• blanket holding body heat to keep a person warm

James measured the temperature outside his house everyday for 2 months. He observed that on days the sky was mostly cloudy, the temperature was an average of 9 degrees cooler than days the sky was mostly sunny. Which best describes the reason for this pattern?

• The clouds blocked radiation from the sun, causing cooler temperatures.
• The clouds blocked conduction from the sun, causing cooler temperatures.
• The clouds allowed more radiation from the sun to reach the Earth’s surface.
• The clouds allowed more conduction from the sun to reach the Earth’s surface.

In what way is roasting a hot dog over a fire an example of the transfer of heat that occurs during radiation?

• Heat circulates from the bottom of the fire up.
• The fire touches the hot dog directly and cooks it.
• Electricity from the fire is transferred to the hot dog.
• The heat from the fire is transferred to the hot dog to warm it.

What best explains why hot air rises above a dark parking lot?

• The dark parking lot heats up the air. The hot air rises by conduction.
• The dark parking lot heats up the air. The hot air rises by convection.
• The dark parking lot heats up the air. The hot air rises by insulation.
• The dark parking lot heats up the air. The hot air rises by radiation.

An engineer can choose from four different materials to make a heat-resistant handle for a stirring spoon. Which material is least likely to get hot when the spoon is placed in boiling water?

• Ceramic
• Wood
• Iron
• Gladd

Clarissa wants to determine the best material to make a new type of cookware. What type of material should she choose?

• A material that conduct heats evenly.
• A material that can be easily bent into shape.
• A material that does not transmit electricity.
• A material that will remain cool to the touch.

Manuel was having trouble opening a new glass jar of pickles. His father told Manuel to hold the metal lid of the jar under running hot water for a few seconds, then try again. Then the lid opened easily. What is the most likely reason Manuel’s father suggested using hot water to loosen the lid?

• Glass contracts when it is heated.
• Metals expand when they are heated.
• Metals are easier to grip when they are warm.
• Hot water reduces friction between metal and glass.