Changes in Heat

The heat from a lamp allows this lizard to remain warm. This is an example of which type of heat transfer?

• radiation

• convection

• conduction

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.

Anya placed an ice cube on the sidewalk on a warm day. The ice cube soon melted to form a puddle. What process caused the ice cube to melt?

• Heat transferred through the ice cube by convection.

• Heat transferred from the air to the ice cube by radiation.

• Heat transferred from the air and the pavement by conduction.

• Heat transferred through the ice cube into the pavement by conduction.

Jake is wearing gloves while he gets a hot pan out of the oven. Which best explains why Jake needs to wear gloves while he is carrying the hot pan?

• The gloves protect his hands from convection heat in the hot pan.

• The gloves protect his hands from heat that is radiated through the hot pan.

• The gloves protect his hands from heat that is conducted through the hot pan.

• The gloves protect his hands from heat that enters the pan from the surrounding air.

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.

A dark-colored wall becomes warm when the sun shines on it. After sunset, a person standing a meter away can feel warmth from the wall. How does heat transfer from the wall to the person?

• radiation

• conduction

• convection

• insultation

Joe wants to slide down on a sunny day, but the slide is too hot. Which is most likely the reason for the slide being hot?

• radiation from the sun

• convection from the sun

• conduction from the sun

• transpiration from the sun

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

• radiation

• conduction

• convection

• combustion

Which shows an example of convection?

• Jose cooks an egg in a pot of boiling water.

• Clara burns her hand by touching a light bulb.

• Lucy wraps herself in an electric blanket to keep warm.

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

What happens to metal railroad tracks during the heat of a summer day?

• decrease in weight

• increase in weight

• decrease in length

• increase in length