Energy unit assessment

Name (first and last)

Sunlight passes through the windows of a car and causes the car seats to get hot. Which type of energy flow is involved in heating the seats?

• conduction
• convection
• insulation
• radiation

Which picture below shows the transfer of heat by conduction?

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The BEST example of heat transfer by convection is when

• sunlight warms soil
• a fan blows air
• flames heat up a frying pan
• heat rises in a chimney

Which of these materials transfers heat energy quickest?

• metal
• glass
• plastic
• wood

Students measure the temperature of water inside four different beakers. They measured the temperature again two hours later. What can the students conclude from the data listed below:

• Cloth is a better insulator than metal foil.
• Paper is a better insulator than cloth
• Plastic film is a better insulator than paper.
• Metal foil is a better insulator than plastic film.

Hot objects begin to cool as

• cooler air is transferred to the object.
• energy in the object is transferred to the surrounding air.
• atoms in the object react with the oxygen in the air.
• energy in the object cancel out energy in the air.

Which of the following statements about thermal energy is true?

• As you hold a cup of hot water your hands cool the water.
• As you hold a glass of cold milk, the cold travels to your hand.
• As you hold a cup of cold milk, your hand cools the milk.
• As you hold a cup of hot water, the heat moves to your hand.

In an investigation, water in a flask is placed on a hot plate. As the water is heated, the cooler, denser water at the surface sinks and pushes the warmer water to the top. What do the arrows in the drawing MOST likely represent?

• phase changes
• convection currents
• electromagnetic radiation
• energy transfer by conduction

How does the color of an object affect the amount of energy it receives from sunlight?

• Light colored objects reflect more light and become warmer than darker objects.
• Light colored objects absorb more light and become warmer than darker objects.
• Dark colored objects reflect more light and become warmer than lighter objects.
• Dark colored objects absorb more light and become warmer than lighter objects.