7th Gr. Unit 2 Final Exam

Energy from the Sun is transmitted to green plants growing on Earth by _____.

• light

• gravity waves

• machines

• fine particles

Which of the following is emitted from the Sun and all stars?

• light energy only

• thermal energy only

• light and thermal energy

• neither light nor thermal energy

The energy-capturing device in this photograph uses energy produced by _____.

• the wind

• moving water

• chemicals

• the Sun

Samantha's class made a solar oven. They put the oven in the sun outside on the playground and collected data on how the temperature in the oven changed over time. What phenomenon were they investigating?

• Energy from the sun can heat objects and materials.

• Materials and objects that are warm can give off heat energy.

• Ovens make their own heat for cooking food.

• Solar ovens are a good way to keep food cold.

What is the biggest difference between heat and temperature?

• Temperature is the degree of hotness, while the heat is the quantity of hotness.

• Heat is the degree of hotness, while the temperature is the quantity of hotness.

• Heat can be measured with a thermometer, while temperature cannot.

• There is no difference between heat and temperature.

Which object has the most thermal energy: a cup of water at 100 degrees C, a gallon of water at 50 degrees C, or a 10 gallon drum of water at 25 degrees C.

• The cup of water at 100 degrees C

• The gallon of water at 50 degrees C.

• The 10 gallon drum of water at 25 degrees C

• Impossible to know.

At which of these temperatures do helium molecules move fastest?

• -269°C

• -25°C

• 18°C

• 36°C

What happens to a sample if the average kinetic energy increases?

• The particles move more quickly and temperature decreases.

• The particles move more quickly and temperature increases.

• The particles move more slowly and temperature increases.

• The particles move more slowly and temperature decreases.

Which of the following would lead to a decrease in temperature?

• Speeding up the atoms in a sample

• Increasing the number of atoms in a sample

• Decreasing the number of atoms in a sample

• Slowing down the atoms in a sample

Which of the following would lead to an increase in temperature?

• Speeding up the atoms in a sample

• Slowing down the atoms in a sample

• Increasing the number of atoms in a sample

• Decreasing the number of atoms in a sample