of the following describes the energy exchanges of this process? A Energy is transferred to the gas by the piston, and to the piston from the heat source. B Energy is transferred to the gas from the heat source, and to the raised piston from the gas. C Energy is transferred to the gas in the form of heat and work done by the piston. D Energy is transferred directly to the piston from the heat source. CSP20508 47 When a steel block at 100 ºC is placed on top of a copper block at 20 ºC, the thermal energy of the copper begins to increase. Which of the following is the source of this increase in energy? A the work done by the molecules within the copper B the work done by the interaction of the two metals C heat flowing by means of conduction D heat flowing by means of radiation CSP20564 48 An engine has an input of heat energy of 10,750 J and does 2420 J of work. Which of the following is the heat loss? A 0.225 J± B 4.44 J± C 8330 J± D 13,170 J± CSP00304 49 A proposed ideal heat engine would run with a high temperature reservoir at 800 kelvin and a low temperature reservoir at 300 kelvin. When the engine is running, it extracts 400 joules of energy from the hot reservoir and does 250 joules of work each minute. How much energy is expelled to the low temperature reservoir each minute? A 150 J± B 250 J± C 300 J± D 400 J± CSP00199 50 The pressure of a gas inside a closed, rigid container will increase when the gas temperature increases. The pressure of the gas increases because the A density of the gas decreases.± B rate of collisions of gas molecules with the ± surface increases. C container expands in size when heated. D gas molecules bond together to form more massive molecules. CSP00149 — 20 —± This is a sample of California Standards Test questions. This is NOT an operational test form. Test scores cannot be projected based on performance on released test questions. Copyright © 2009 California Department of Education.
� � � � � � CALIFORNIA STANDARDS TEST Released Test Questions Physics 51 A gas in a sealed cylinder is heated. gas Heat Which of the following does not increase as the gas is heated? A the average number of gas molecules hitting the cylinder walls per second B the average kinetic energy of the gas molecules C the average speed of the gas molecules D the average distance between the gas molecules CSP00198 52 When a gas is heated in a closed container, the internal pressure increases. Which best describes the reason for the increase in pressure? A The average kinetic energy of the gas molecules decreases. B The potential energy of the gas increases. C The average kinetic energy of the gas molecules increases. D The potential energy of the gas decreases. CSP00315 53 Molecules move about in random motion within a liquid. The total internal energy of the liquid depends on all of the following except its A temperature.± B mass.± C specific heat.± D melting point.± CSP10306 54 In which of the following processes is the order of the system increasing?