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Name: ____________________________ ___________________ Energy Test 2012

|1. |A transfer of heat within a liquid or gas that involves warm particles moving in currents is |

|[pic] |A. |conduction |

|[pic] |B. |convection. |

|[pic] |C. |correction. |

|[pic] |D. |connection. |

|2. |Which types of heat transfer involve heat flow from hot objects to colder objects? |

|[pic] |A. |convection and radiation, but not conduction |

|[pic] |B. |convection and conduction, but not radiation |

|[pic] |C. |convection, conduction, and radiation |

|[pic] |D. |convection, but not conduction or radiation |

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|3.|Four ice cubes are dropped into a glass of room-temperature water. |

| |[pic] |

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| |The _______ difference between the ice cubes and the water causes _______ energy |

| |to be transferred from the water to the ice cubes. |

| | |

| |A. temperature; cold |

| |B. size; cold |

| |C. temperature; heat |

| |D. size; heat |

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|4. |Sunlight heats the ground, and the ground warms the nearby air. The warm air expands and rises, while cool air rushes in to take|

| |its place. |

| |[pic] |

| | |

| |The example above describes the process that generates many surface winds. Surface winds are an example of _______ in the |

| |Earth's atmosphere. |

|[pic] |A. |conduction |

|[pic] |B. |condensation |

|[pic] |C. |radiation |

|[pic] |D. |convection |

| | | |

|5. |The heat from the Sun must pass through the vacuum of space before it reaches the Earth. Which process is illustrated in this |

| |example? |

|[pic] |A. |Convection |

|[pic] |B. |induction |

|[pic] |C. |radiation |

|[pic] |D. |conduction |

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|6. |Heat can be transferred through conduction, convection, and radiation. What is necessary in order for heat to be transferred by |

| |conduction? |

|[pic] |A. |The substances must be liquids or gases. |

|[pic] |B. |The objects must be in direct contact with one another. |

|[pic] |C. |Heat must be transferred through space. |

|[pic] |D. |Heat must be transferred in the form of currents. |

|7. |Ice is placed in hot water. What happens to the temperature of the ice and the water? |

|[pic] |A. |The ice gets warmer, and the water stays the same. |

|[pic] |B. |The ice gets warmer, and the water gets cooler. |

|[pic] |C. |The ice and the water both get cooler. |

|[pic] |D. |The ice gets cooler, and the water gets warmer. |

| | | |

|8. |Before breakfast, Lacie dropped an ice cube into her coffee. After a few seconds, she noticed that the ice cube had melted in |

| |the coffee. Which of the following statements correctly explains what Lacie witnessed? |

|[pic] |A. |The cold from the ice cube was transferred into the coffee, which melted the ice. |

|[pic] |B. |The cold from the ice cube went into the air, which melted the ice. |

|[pic] |C. |The basic ice cube reacted with the acidic coffee, which caused the ice cube to melt. |

|[pic] |D. |Heat from the coffee transferred into the ice cube, which melted the ice. |

|9. |Which of the following is an example of convection? |

|[pic] |A. |a hot object transferring heat to a cooler one |

|[pic] |B. |hot air rising and cooler air falling |

|[pic] |C. |a hot oven warming the air around it |

|[pic] |D. |the rays of the Sun warming the earth |

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|10. |Hakeem has a cold carton of milk (A) and a hot thermos filled with soup (B). He places the two objects so that they are in |

| |contact with each other |

| |[pic] |

| | |

| |Which diagram accurately shows the direction of heat flow in this situation? |

| |[pic] |

| |W. |

| |[pic] |

| |X. |

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| |[pic] |

| |Y. |

| |[pic] |

| |Z. |

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|[pic] |A. |Z |

|[pic] |B. |W |

|[pic] |C. |X |

|[pic] |D. |Y |

|11. |Which of the following processes transfers heat? |

|[pic] |A. |conduction |

|[pic] |B. |convection |

|[pic] |C. |radiation |

|[pic] |D. |all of these |

|12. |Energy that transfers between substances because of a temperature difference between the substances is known as _______. |

|[pic] |A. |electromagnetic radiation |

|[pic] |B. |heat energy |

|[pic] |C. |chemical energy |

|[pic] |D. |potential energy |

|13. |Through which of the following ways does the Sun primarily transfer its heat energy to the Earth? |

|[pic] |A. |conduction |

|[pic] |B. |radiation |

|[pic] |C. |reflection |

|[pic] |D. |convection |

|14. |Which of the following is an example of conduction? |

|[pic] |A. |Leftovers become warm when reheated in the microwave. |

|[pic] |B. |Campers warm up while sitting by a campfire. |

|[pic] |C. |A dog's bowl of water warms up out in the Sun. |

|[pic] |D. |A metal spoon becomes warm when placed in a cup of hot tea. |

|15. |Jimmy held the end of a metal bar over a fire while holding on to the opposite end. After a few minutes, the end he was holding|

| |began to get very hot. Which process is illustrated in this example? |

|[pic] |A. |induction |

|[pic] |B. |convection |

|[pic] |C. |radiation |

|[pic] |D. |conduction |

|16. |The light from the Sun heats a metal surface. This is an example of |

|[pic] |A. |convection. |

|[pic] |B. |conduction. |

|[pic] |C. |reflection. |

|[pic] |D. |radiation. |

|17. |Which of the following is an example of heat transfer by radiation? |

|[pic] |A. |the Sun warming the Earth |

|[pic] |B. |a fire warming a group of campers |

|[pic] |C. |an electric space heater warming a room |

|[pic] |D. |all of these |

|18. |Cindy makes herself a cup of hot chocolate on a very cold day. |

| |[pic] |

| | |

| |If Cindy's hands are very cold and the cup is very hot, heat energy transfers from the cup to her hands because |

|[pic] |A. |one is a solid and the other is mostly a liquid. |

|[pic] |B. |of the temperature difference between them. |

|[pic] |C. |of the size difference between them. |

|[pic] |D. |cold energy spreads from cool objects to warm objects. |

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|19. |Lidia sets an empty metal pot on a hot stove burner. Which diagram best shows how the heat flows through the metal of the |

| |pot? |

| |[pic] |

| |W. |

| |[pic] |

| |X. |

| | |

| |[pic] |

| |Y. |

| |[pic] |

| |Z. |

| | |

|[pic] |A. |X |

|[pic] |B. |W |

|[pic] |C. |Y |

|[pic] |D. |Z |

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|20. |Lidia sets an empty metal pot on a hot stove burner. Which diagram best shows how the heat flows through the metal of the pot? |

| |[pic] |

| |W. |

| |[pic] |

| |X. |

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| |[pic] |

| |Y. |

| |[pic] |

| |Z. |

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|[pic] |A. |Z |

|[pic] |B. |Y |

|[pic] |C. |X |

|[pic] |D. |W |

|21. |Which of the following is an example of heat transfer through conduction? |

|[pic] |A. |a microwave warming a cup of water |

|[pic] |B. |the Sun drying clothes hanging outside |

|[pic] |C. |a pan on the stove getting hot |

|[pic] |D. |hot air rising inside a house |

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|22. |Which of the following is a true statement about heat transfer? |

|[pic] |A. |Heat always flows from cooler objects to warmer objects. |

|[pic] |B. |Heat always flows from warmer objects to cooler objects. |

|[pic] |C. |Heat never transfers from solids to liquids. |

|[pic] |D. |Heat never travels in a similar pattern. |

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|23. |Samantha's class is learning about conductors and insulators of electricity. She studies an appliance cord that has been |

| |cut to show the two main parts. The cord is made up of a metal wire and a plastic covering. |

| | |

| |The metal wire is ____________, and it... |

|[pic] |A. |an insulator; does not allow electricity to flow. |

|[pic] |B. |a conductor; allows electricity to flow. |

|[pic] |C. |a conductor; does not allow electricity to flow. |

|[pic] |D. |an insulator; allows electricity to flow. |

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|24. |In which of the following methods of heat transfer is it necessary for the objects to be directly touching one another? |

|[pic] |A. |conduction |

|[pic] |B. |radiation |

|[pic] |C. |convection |

|[pic] |D. |all of these |

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|25. |A candle is lit. The heat of the flame will melt the candle because |

|[pic] |A. |the wax of the candle is repelled by the flame. |

|[pic] |B. |the heat of the hot flame is transferred to the colder candle. |

|[pic] |C. |the flame takes all the heat energy and the candle has no energy. |

|[pic] |D. |the candle must stay hot to heat the flame. |

|26. |[pic] |

| |Pat pours cold, liquid cream into a cup of hot coffee. Which of the following describes how the hot coffee and cold cream |

| |will interact? |

|[pic] |A. |The cold cream will drop to the bottom of the cup. When it warms, some of it will rise back to the surface. |

|[pic] |B. |The cold cream will drop to the bottom of the cup. It will remain there, unless it is stirred. |

|[pic] |C. |The cold cream will remain at the surface. When it warms, some of it will fall to the bottom of the cup. |

|[pic] |D. |The cold cream will immediately reach the same temperature as the coffee and spread evenly though the cup. |

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|27. |Once heat from the Sun penetrates the Earth's atmosphere, the heat is circulated as warm air rises and cold air sinks. What |

| |is this process called? |

|[pic] |A. |conduction |

|[pic] |B. |Convection |

|[pic] |C. |Radiation |

|[pic] |D. |Reflection |

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