Chapter 10 Test Form B
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1 Chapter 10 Test Form A 1. B 2. A 3. A 4. B 5. D 6. B 7. B 8. A 9. A 10. A 11. B 12. D 13. A 14. C 15. No, heat and cold do not flow between objects. Energy transferred between objects changes the temperature of the object. 16. An object at high temperature has higher-energy particles and an object at low temperature has lower-energy particles. Energy is transferred as heat from the higher-energy particles to the lower-energy particles through collisions of the higher with the lower energy particles. 17. The ice begins to melt and change into water. 18. Thermal conduction is the process by which energy is transferred as heat through a material between two points at different temperatures. The atoms of the hotter substance lose energy and the atoms of the cooler substance gain energy. 19. Hypothermia is the transfer of too much energy from the human body to the surrounding air so that body temperature falls below normal levels. 20. Covering the body would protect it from direct sunlight and prevent excessive loss of body water through evaporation. Chapter 10 Test Form B 1. B 2. D 3. C 4. A 5. C 6. A 7. A 8. C 9. B 10. A 11. B 12. B 13. D 14. A 15. C 16. When energy is added to the gas, the kinetic energy of the molecules increases. The temperature increases because temperature is proportional to kinetic energy of the molecules. 17. The molecules of water have a higher kinetic energy, so there are more particle collisions per time per mass in the water than in the hand. Energy is transferred as heat to the outer layers of skin on the hand, which has fewer molecular collisions per time per mass. 18. The temperature stops rising, and the water turns into steam. 19. Air is an extremely poor thermal conductor. A thin layer of air near the skin provides a barrier from energy transfer. 20. Covering the body would protect it from direct sunlight and prevent excessive loss of body water through evaporation. 210
2 10 Test B SHORT ANSWER provided. Write the answers to the following questions in the space Energy added (a) (b) 16. Describe how temperature is related to the kinetic energy of the molecules of the gas in the figure above. 17. On the microscopic level, explain the concept of energy transfer when a hand is placed in water that is 113 F. 18. In the figure above question 8, what happens to the ice at 100 C? 19. Why is air an effective thermal insulator for the body? 20. Why would covering most of the body keep a person cool in the desert? 80
3 10 Test B 12. What is the temperature increase of water per kilogram at the bottom of a 145 m waterfall if all of the initial potential energy is transferred by heat to the water? (g = 9.81 m/s 2 and c p = 4186 J/kg C) a C c C b C d C 13. A 0.2 kg mass of metal with a specific heat capacity of J/kg C and an initial temperature of 90 C is placed in a 500 g calorimeter at an initial temperature of 20 C with a specific heat capacity of J/kg C. The calorimeter is filled with 0.1 kg of water with an initial temperature of 20 C. When the combination of the metal, the calorimeter, and the water reaches equilibrium, what is the final temperature? a. 70 C c. 50 C b. 60 C d. 40 C 14. Find the final equilibrium temperature when 10.0 g of milk at 10.0 C is added to g of coffee with a temperature of 90.0 C. Assume the specific heats of coffee and milk are the same as for water (c w = 4.19 J/g C), and disregard the heat capacity of the container. a C c C b C d C 15. A 1.0 kg cube of ice is dropped into 1.0 kg of water, and when equilibrium is reached, there are 2.0 kg of ice at 0.0 C. The initial temperature of the water was 0 C. What was the original temperature of the ice? (c w = 4186 J/kg C, c i = 2093 J/kg C, and L f = J/kg) a. one or two degrees below 0.0 C b. 80 C c. 160 C d. 240 C Chapter 10 79
4 10 Test B 7. If there is no temperature difference between a substance and its surroundings, what has occurred on the microscopic level? a. Energy was transferred from higher-energy particles to lower-energy particles. b. Energy was transferred from lower-energy particles to higher-energy particles. c. Thermal equilibrium was not reached. d. Energy has been flowing back and forth. Temperature ( C) A Ice B Ice + water C Water Water + steam Heat ( 10 3 J) D E Steam At what point on the figure above is the amount of energy transferred as heat approximately J? a. A c. C b. B d. D 9. On a sunny day at the beach, the reason the sand gets hot and the water stays relatively cool is attributed to the difference in which property between water and sand? a. mass density c. temperature b. specific heat d. thermal conductivity 10. Which of two rods has the greatest thermal conductivity? a. a rod with electrons that are freer to move from atom to atom than another rod b. a rod with greater specific heat than another rod c. a rod with greater cross-sectional area than another rod d. a rod with greater length than another rod 11. The normal body temperature for human beings is 98.6 F. This corresponds to which of the following in kelvins? a. 296 K c. 393 K b. 310 K d. 273 K 78
5 Chapter 10 HOLT PHYSICS Test B Heat MULTIPLE CHOICE On the line at the left of each statement, write the letter of the choice that best completes the statement or answers the question. 1. Which of the following is proportional to the kinetic energy of atoms and molecules? a. elastic energy c. potential energy b. temperature d. thermal equilibrium 2. What is the temperature of a system in thermal equilibrium with another system made up of water and steam at 1 atm of pressure? a. 0 F c. 0 K b. 273 K d. 100 C 3. If two small beakers of water, one at 70 C and one at 80 C, are emptied into a large beaker, what is the final temperature of the water? a. less than 70 C b. greater than 80 C c. between 70 C and 80 C d. The water temperature will fluctuate. 4. A substance registers a temperature change from 20 C to 40 C. This change corresponds to an incremental change of a. 20 K. c. 36 K. b. 40 K. d. 313 K. 5. Why does sandpaper get hot when it is rubbed against rusty metal? a. Energy is transferred from the sandpaper into the metal. b. Energy is transferred from the metal to the sandpaper. c. Friction is creating the heat. d. Energy is transferred from a hand to the sandpaper. 6. Which of the following terms describes energy that is transferred? a. heat c. temperature b. internal energy d. kinetic energy Chapter 10 77
6 10 Test A 17. In the figure above question 8, what happens to the ice at 0 C? 18. What is thermal conduction? What happens to atoms during thermal conduction? 19. What is hypothermia? 20. Why would covering most of the body keep a person cool in the desert? 76
7 10 Test A 12. A 0.2 kg mass of metal with a specific heat capacity of J/kg C and an initial temperature of 90 C is placed in a 500 g calorimeter at an initial temperature of 20 C with a specific heat capacity of J/kg C. The calorimeter is filled with 0.1 kg of water with an initial temperature of 20 C. When the combination of the metal, the calorimeter, and the water reaches equilibrium, what is the final temperature? a. 70 C c. 50 C b. 60 C d. 40 C 13. Find the final equilibrium temperature when 10.0 g of milk at 10.0 C is added to g of coffee with a temperature of 90.0 C. Assume the specific heats of coffee and milk are the same as for water (c w = 4.19 J/g C), and disregard the heat capacity of the container. a C c C b C d C 14. A 1.0 kg cube of ice is dropped into 1.0 kg of water, and when equilibrium is reached, there are 2.0 kg of ice at 0.0 C. The initial temperature of the water was 0 C. What was the original temperature of the ice? (c w = 4186 J/kg C, c i = 2093 J/kg C, and L f = J/kg) a. one or two degrees below 0.0 C b. 80 C c. 160 C d. 240 C SHORT ANSWER provided. Write the answers to the following questions in the space 15. Do heat and cold flow between objects? Explain. 16. Describe on the microscopic level why energy transferred as heat moves from an object at high temperature to an object at low temperature. Chapter 10 75
8 10 Test A 7. High temperature is related to a. low kinetic energy. c. no difference in kinetic energy. b. high kinetic energy. d. zero net energy. Temperature ( C) A Ice B Ice + water C Water Water + steam Heat ( 10 3 J) D E Steam The figure above shows how the temperature of 10.0 g of ice changes as energy is added. Which of the following statements is correct? a. The water absorbed energy continuously, but the temperature increased only when all of the water was in one phase. b. The water absorbed energy sporadically, and the temperature increased only when all of the water was in one phase. c. The water absorbed energy continuously, and the temperature increased continuously. d. The water did not absorb energy. 9. The use of fiberglass insulation in the outer walls of a building is intended to minimize energy transfer through what process? a. conduction c. convection b. radiation d. vaporization 10. Which of the following is the equivalent of 88 F? a. 31 C. c. 56 C. b. 49 C. d. 160 C. 11. What is the temperature increase of water per kilogram at the bottom of a 145 m waterfall if all of the initial potential energy is transferred as heat to the water? (g = 9.81 m/s 2 and c p = 4186 J/kg C) a C c C b C d C 74
9 Chapter 10 HOLT PHYSICS Test A Heat MULTIPLE CHOICE On the line at the left of each statement, write the letter of the choice that best completes the statement or answers the question. 1. A substance s temperature increases as a direct result of a. energy being removed from the particles of the substance. b. kinetic energy being added to the particles of the substance. c. a change in the number of atoms and molecules in a substance. d. a decrease in the volume of the substance. 2. What happens to the internal energy of an ideal gas when it is heated from 0 C to 4 C? a. It increases. c. It remains constant. b. It decreases. d. It is impossible to determine. 3. Which of the following best describes the relationship between two systems in thermal equilibrium? a. No net energy is exchanged. c. The masses are equal. b. The volumes are equal. d. The velocity is zero. 4. What is the temperature of a system in thermal equilibrium with another system made up of ice and water at 1 atm of pressure? a. 0 F c. 0 K b. 273 K d. 100 C 5. All of the following are widely used temperature scales EXCEPT a. Kelvin. c. Celsius. b. Fahrenheit. d. Joule. 6. If energy is transferred from a table to a block of ice moving across the table, which of the following statements is true? a. The table and the ice are at thermal equilibrium. b. The ice is cooler than the table. c. The ice is no longer 0 C. d. Energy is being transferred from the ice to the table. Chapter 10 73
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