Multiple Choice

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1. If there is no change in the internal energy of a gas, even though energy is transferred to the gas as heat and work, what is the thermodynamic process that the gas undergoes called?

A. adiabatic B. isothermalC. isovolumetricD. isobaric

Chapter 10



2. To calculate the efficiency of a heat engine, which thermodynamic property does not need to be known?

F. the energy transferred as heat to the engine G. the energy transferred as heat from the engine H. the change in the internal energy of the engine J. the work done by the engine

Standardized Test PrepChapter 10



3. In which of the following processes is no work done?

A. Water is boiled in a pressure cooker. B. A refrigerator is used to freeze water.

C. An automobile engine operates for several minutes.

D. A tire is inflated with an air pump.




4. A thermodynamic process occurs in which the entropy of a system decreases. From the second law of thermodynamics, what can you conclude about the entropy change of the environment?

F. The entropy of the environment decreases. G. The entropy of the environment increases. H. The entropy of the environment remains

unchanged. J. There is not enough information to state what

happens to the environment’s entropy.




Use the passage and diagrams to answer questions 5–8.

A system consists of steam within the confines of a steam engine, whose cylinder and piston are shown in the figures below.


5. Which of the figures describes a situation in which U < 0, Q < 0, and W = 0?

A. (a)

B. (b)

C. (c)

D. (d)






6. Which of the figures describes a situation in which U > 0, Q = 0, and W < 0?

F. (a)

G. (b)

H. (c)

J. (d)






7. Which of the figures describes a situation in which U < 0, Q = 0, and W > 0?

A. (a)

B. (b)

C. (c)

D. (d)






8. Which of the figures describes a situation in which U > 0, Q > 0, and W = 0?

F. (a)

G. (b)

H. (c)

J. (d)



9. A power plant has a power output of 1055 MW and operates with an efficiency of 0.330. Excess energy is carried away as heat from the plant to a nearby river. How much energy is transferred away from the power plant as heat?

A. 0.348 109 J/sB. 0.520 109 J/s C. 0.707 109 J/s D. 2.14 109 J/s




10. How much work must be done by air pumped into a tire if the tire’s volume increases from 0.031 m3 to 0.041 m3 and the net, constant pressure of the air is 300.0 kPa?

F. 3.0 102 JG. 3.0 103 JH. 3.0 104 JJ. 3.0 105 J




Use the passage below to answer questions 11–12.

An air conditioner is left running on a table in the middle of the room, so none of the air that passes through the air conditioner is transferred to outside the room.

11. Does passing air through the air conditioner affect

the temperature of the room? (Ignore the thermal

effects of the motor running the compressor.)




Use the passage below to answer questions 11–12.

An air conditioner is left running on a table in the middle of the room, so none of the air that passes through the air conditioner is transferred to outside the room.

12. Taking the compressor motor into account, what

would happen to the temperature of the room?




13. If 1600 J of energy are transferred as heat to an

engine and 1200 J are transferred as heat away

from the engine to the surrounding air, what is the

efficiency of the engine?




14. How do the temperature of combustion and the

temperatures of coolant and exhaust affect the

efficiency of automobile engines?


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