Thermal Energy Question Preview (ID: 58015)


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A home had a wooden floor put down in cool weather. As the weather warmed, the floor started to buckle. The floor was fixed by trimming the edges so there was space between the flooring and the wall. Why did this help to make the floor flat again?
a) Floor particles decrease in warm weather decreasing the kinetic energy making it expand. Trimming it gave it room to expand.
b) Floor particles increase in warm weather increasing the kinetic energy making it expand. Trimming it gave it room to expand.
c) Floor particles decrease in warm weather decreasing the kinetic energy making it contract. Trimming it gave room to contract.
d) Floor particles increase in warm weather increasing the kinetic energy making it contract. Trimming it gave room to contract.

Baking cookies in the oven is an example of how energy is (1) ____________.
a) conserved
b) saved
c) made
d) created

A student gets ready to go to school one day, and he finds out that his car's battery is dead. The headlights will not come on, and the car won’t start. What transformations usually happen when the battery is active and the headlights come on?
a) chemical → electrical → light
b) electrical → kinetic → light
c) light → electrical → chemical
d) thermal → electrical → light

The front door is made of steel. When it is warm outside, the door is difficult to open or close. When it is cool, the door does not stick. Which statement explains why this happens?
a) When a material contracts, it increases in volume due to an increase in kinetic energy.
b) Different materials expand and contract at the same rates due to the kinetic energy being the same.
c) Thermal expansion makes the door fit better when it is cooler due to a decrease in kinetic energy.
d) The metal in the door expands when it becomes warm due to an increase in kinetic energy, and contracts when it's cooler.

The contents of the bucket were in a (1) _______________ state. If the contents were heated up enough, they would change to a (2) ________________ state.
a) liquid; gas
b) liquid; solid
c) solid; gas
d) gas; liquid

Two boys place meat and vegetables from the refrigerator onto the hot grill. When the food is cooked and taken off the grill, it is at a much higher temperature than it was before it was cooked. Which statements are true about the food?
a) The kinetic energy of the food particles increased, causing the food temperature to rise.
b) The kinetic energy of the food particles decreased, causing the food temperature to rise.
c) The thermal energy of the food decreased.
d) n/a

A student likes to attend football games, no matter how cold the weather becomes. She activates a hand warmer and tucks it into the glove she is wearing. She holds her hands together to warm them. Which best describes how her hands were warmed?
a) Heat was transferred by conduction, resulting in an increase in kinetic energy.
b) Heat was transformed by convection, resulting in the conservation of energy.
c) Thermal energy was transferred by currents, resulting in an increase in kinetic energy.
d) Heat was transformed by radiation, resulting in an increase in kinetic energy.

You gather logs, twigs, and leaves to build a campfire. As you sit by the fire, the logs burn bright in the darkness, and you feel the heat coming toward you. Which of these statements are true about the amount of energy transformed in the camp fire?
a) The Law of Conservation of Energy applies to these transformations.
b) The chemical energy in the logs is lost during the transformation.
c) The fire is hotter than the logs were, so energy is gained in this transformation.
d) n/a

In photosynthesis, solar energy undergoes a _______________ when it changes from light energy to chemical energy. When the sun warms Earth’s surface, thermal energy is ___________________ to land and water.
a) transformation; transferred
b) transfer; transformed
c) n/a
d) n/a

Thermal energy either ____________ from one object to another as it is transferred or _______________ into a different form as it is transformed.
a) moves; changes
b) increases; deflects
c) changes; moves
d) decreases; deflects

When you cook dinner, you heat your dinner on a hot stove. When you place a piece of cool metal in the sun, it is heated by the sun’s energy. Why is heat the correct term to use in these examples?
a) They show that when objects are touching, they are the same temperature.
b) They show that heat flows from something warmer to something cooler.
c) They indicate that heat is created to raise the termperature of something.
d) They indicate that the kinetic energy of the particles decreases when something is heated.

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