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WorksheetsThermal Energy Test REVIEW
Total questions: 20
Worksheet time: 10mins
A student poured 200 ml of 75 oC water into 200 ml of 15 oC water in a 500 ml insulated container. What temperature will the mixture of water be?
60 oC
50 oC
45 oC
90 oC
200 ml of 30 oC water is mixed with 200 ml of 20 oC water. What is the temperature of the final mixture?
25 oC
50 oC
10 oC
60 oC
A light bulb uses electricity to produce light. What indicates that the light bulb does not use the electricity with 100% efficiency?
The light bulb gets brighter
The light bulb gets dimmer
The light bulb gets hot
The light bulb turns off
A generator uses fuel to produce electricity. What indicates that the generator does not use the fuel with 100% efficiency?
The generator speeds up
The generator stops
The generator is loud
The generator slows down
A car burns fuel, a transformation from chemical to mechanical energy takes place. What is the most likely result of the fuel burning?
The matter that makes up the car increases
The amount of useful energy decreases
The efficiency of the car increases
The amount of heat energy decreases
A flashlight uses batteries. A transformation from chemical to electromagnetic energy takes place. What is the most likely result of the transformation?
The mass of the flashlight increases
The efficiency of the flashlight increases
The amount of heat energy decreases
The amount of useful energy decreases
Water at 20 oC is placed on a stove. The water is heated to 90 oC, what happens as a result of the increased temperature?
The potential energy increases
The evaporation decreases
The disorder decreases
The entropy increases
Water at 70 oC is placed in a refrigerator. The water is cooled to 30 oC, what happens as a result of the decreased temperature?
The potential energy decreases
The evaporation increases
The disorder increases
The entropy decreases
Why is the output energy of a machine always less than the input energy?
Some of the energy is destroyed as the machine operates
The machine must overcome the constant force of magnetism
Useful energy decreases as energy is transformed into the surroundings
Some of the energy is released as heat when converted.
Why is the output energy of an engine less than the input energy?
Some of the energy is destroyed as the engine runs
The engine must overcome the constant force of gravity
Useful energy decreases as the engine transforms energy into the surroundings
Some of the energy is released as thermal energy when converted.
Which change will occur in a system with increasing entropy?
Thermal energy will increase
Mechanical energy will increase
Elastic potential energy will decrease
Radiant energy will decrease
Which change will occur in a system with decreasing entropy?
Thermal energy will decrease
Mechanical energy will decrease
Electrical energy will decrease
Radiant energy will decrease
An ice cube is placed in some hot tea. After a couple minutes the ice cube disappears. What best describes the change that took place?
Heat energy in the ice cube was dissipated into the hot tea
The total heat energy in the tea was reduced by the ice cube
The hot tea lost the same amount of heat energy as the ice cube gained.
Heat energy in the hot water was reduced by the kinetic energy in the ice cube
A glass of soda with ice in it is left out on the counter overnight. The next morning the ice is gone. What best describes the change that took place?
Heat energy in the ice cube was dissipated into the soda
The total heat energy in the soda was reduced by the ice cube
The soda lost the same amount of heat energy as the ice cube gained.
Heat energy in the soda was reduced by the kinetic energy in the ice cube
Which best describes the transfer of energy when hot fudge is placed on ice cream.
Heat flows from the hot fudge to the ice cream
Cold flows from the ice cream to the hot fudge
Cold flows from the ice cream and heat flows from the hot fudge
Heat flows simultaneously between the ice cream and the hot fudge
Cold blueberries are placed on hot pancakes. Which statement best describes the transfer of energy.
Heat flows from the pancakes to the blueberries
Cold flows from the blueberries to the pancakes
Cold flows from the blueberries and heat flows from the pancakes
Heat flows simultaneously between the blueberries and pancakes
Entropy is a measure of the amount of disorder in a system. The concept of entropy can be applied to an ice cube melting. Which statement best describes the puddle of water after an ice cube melts?
It is at minimum entropy and minimum order
It is at maximum entropy and minimum order
It is at minimum entropy and maximum order
It is at maximum entropy and maximum order
Entropy is a measure of the amount of disorder in a system. The concept of entropy can be applied to forming a diamond. Which statement best describes the carbon molecules after they have formed a diamond?
It is at minimum entropy and minimum order
It is at maximum entropy and minimum order
It is at minimum entropy and maximum order
It is at maximum entropy and maximum order
A cup of hot cocoa cooling over time is an example of which phenomenon?
Spread of heat energy toward uniform distribution
destruction of energy as it is transformed into heat
heat energy being transformed into work
storage of heat energy in chemical bonds
A cup of ice water warming over time is an example of which phenomenon?
Spread of heat energy toward uniform distribution
destruction of energy as it is transformed into thermal energy
thermal energy being transformed into work
storage of heat energy in chemical bonds
