Exam on Heat and Energy True/False Indicate whether the statement is true or false. 1. Energy is the ability to cause change. 2. Energy is measured in joules. 3. When you ride a playground swing, your potential energy is greatest at the highest point. 4. Chemical energy travels from the Sun to Earth and is transformed into light energy by plants. 5. Carbohydrates and fats provide our bodies with energy in the form of calories. 6. Radiation is the transfer of energy in the form of particles. 7. In a forced-air heating system, the warm air circulates by convection. Multiple Choice Identify the choice that best completes the statement or answers the question. 8. Thermal energy is measured in. a. joules c. ºC b. N d. j/kg 9. The energy of an object increases with its height. a. chemical c. thermal b. kinetic d. potential 10. The kinetic energy of an object increases as its increases. a. height above Earth c. potential energy b. speed d. volume 11. Green plants convert light energy from the sun into. a. gravitational potential energy c. thermal energy b. chemical potential energy d. mechanical energy 12. The law of states that energy in a system can change forms but can never be created or destroyed. a. conversion of energy c. conservation of energy b. consecration of energy d. construction of energy 13. Wind and ocean currents are formed by. a. radiation c. conduction b. convection d. condensation 14. A material that reduces the flow of heat by conduction, convection, and radiation is a(n). a. conductor c. solar collector b. insulator d. radiator 15. All of the following are good conductors of heat EXCEPT. a. silver c. aluminum b. copper d. air 16. Through which of the following will convection most likely occur? a. solids and liquids c. solids b. solids and gases d. liquids and gases 17. The transfer of energy that does not require matter is.
a. combustion c. convection b. conduction d. radiation 18. Energy from the sun travels to Earth as. a. mechanical energy c. radiant energy b. chemical energy d. combustion 19. Temperature measures the of the particles of a material. a. heat c. potential energy b. kinetic energy d. kinetic and potential energy Applying Concepts Use the figure below to answer the question(s) below. 20. How will the heat from the pot in room A move to its handle? a. convection c. conduction b. radiation d. both a and b 21. Thermal energy is transferred to the sunbather in room B by. a. convection c. conduction b. radiation d. both a and b 22. Where does most of the heat provided by the fire in room C go? a. up the chimney c. to the people b. into the room d. none of these 23. In room C, thermal energy is transferred to the people by. a. convection c. radiation b. conduction d. both a and c 24. In room D, the thermal energy of the iron is transferred to the clothes by. a. convection c. radiation b. conduction d. none of these 25. The SI unit for energy is the. a. calorie c. meter per second b. joule d. kilogram 26. According to the law of conservation of energy, the total amount of energy in the universe. a. remains constant c. increases b. changes constantly d. decreases 27. A material that reduces the flow of heat by conduction, convection, and radiation is. a. a conductor c. an insulator
b. condensation d. a solar collector 28. All of the following are good conductors of heat EXCEPT. a. air c. copper b. aluminum d. silver 29. Energy from the Sun travels to Earth as. a. chemical energy c. radiant energy b. combustion d. mechanical energy 30. One reason alternative energy sources are needed is because. a. the energy needs of the world are decreasing b. there is no limit to the supply of fossil fuels c. the population of the world is decreasing d. the supply of fossil fuel is diminishing Short Answer 31. When coasting while roller skating, you eventually stop. Why? 32. On a hot day, which would stay cool longer, a sheet of aluminum (specific heat 920 J/kg K) or copper (specific heat 380 J/kg K)? Why?
Exam on Heat and Energy Answer Section TRUE/FALSE 1. ANS: T PTS: 1 DIF: B OBJ: 1/1 STA: S8P2 2. ANS: T PTS: 1 DIF: B OBJ: 1/1 STA: S8P2c 3. ANS: T PTS: 1 DIF: B OBJ: 7/2 STA: S8P2b 4. ANS: F PTS: 1 DIF: B OBJ: 7/2 STA: S6E6a S7L4b S8P2 S8P2c S8P2d 5. ANS: T PTS: 1 DIF: A OBJ: 2/1 STA: S7L4a S8P2 S8P2c 6. ANS: F PTS: 1 DIF: B OBJ: 5/2 7. ANS: T PTS: 1 DIF: B OBJ: 8/3 MULTIPLE CHOICE 8. ANS: A PTS: 1 9. ANS: D PTS: 1 10. ANS: B PTS: 1 11. ANS: B PTS: 1 12. ANS: C PTS: 1 13. ANS: B PTS: 1 14. ANS: B PTS: 1 15. ANS: D PTS: 1 16. ANS: D PTS: 1 17. ANS: D PTS: 1 18. ANS: C PTS: 1 19. ANS: B PTS: 1 20. ANS: C PTS: 1 21. ANS: D PTS: 1 22. ANS: A PTS: 1 23. ANS: D PTS: 1 24. ANS: B PTS: 1 25. ANS: B PTS: 1 DIF: B OBJ: 1/1 STA: S6CS3b S8P2c 26. ANS: A PTS: 1 DIF: B OBJ: 7/2 STA: S8P2a 27. ANS: C PTS: 1 DIF: B OBJ: 5/2 28. ANS: A PTS: 1 DIF: B OBJ: 5/2
29. ANS: C PTS: 1 DIF: B OBJ: 5/2 30. ANS: D PTS: 1 DIF: B OBJ: 7/3 STA: S6E6 S6E6b SHORT ANSWER 31. ANS: Friction causes the kinetic energy to transfer to thermal energy. PTS: 1 DIF: B OBJ: 5/2 STA: S8P2 S8P2c 32. ANS: Aluminum, because it will take longer for the aluminum to get hot because it has a higher specific heat. PTS: 1 DIF: A OBJ: 3/1 STA: S8P1d S8P2d