|
QUIZ 12 CHAPTER 18 |
| below correct answers are marked with * answers c b c a b |
| 11.The lowest theoretical temperature is |
| a. 0 oC |
| b. - 273 K |
| c. 0 K* |
| d. nota |
| 12. 373 K is equal to |
| a. 0 o C |
| b. 100 oC* |
| c. 273 o C |
| d nota |
| 13. Helium has the special property that its internal energy is directly proportional to its temperature. Consider a container of helium with a temperature of 10 oC. If the helium is heated until it has twice the internal energy, what is the final temperature ? |
| a. 20 oC |
| b. 586 K |
| c. 566 K* |
| d. nota |
| 14. If 100 J of heat is added to a gas system than does no external work, what is the change in internal energy of the system? |
| a. 100 J* |
| b. -100 J |
| c. 0 J |
| d. nota |
| 15. If 1800 J of heat is added to a gas system than does 1700 J external work, what is the change in internal energy of the system? |
| a. 200 J |
| b. 100 J* |
| c. -200 J |
| d. nota |
| 16. During a certain thermodynamic process, a sample of gas expands, and cools, reducing it's internal energy by 5467.90 J No heat is added or taken away during the process. How much work is done by the sample? |
| a. 0 J |
| b. - 5467.90 J |
| c. 5467.90 J* |
| d. nota |
| 17. What is the ideal efficiency of an automobile engine in which the fuel is heated to 1500 K and the outdoor air is 300 K? |
| a. 0.1 |
| b. 0.2 |
| c. 0.3 |
| d. 0.8* |
| e. nota |
| 18. A parcel of dry air expands adiabatically as it rises. The temperature of the air |
| a. increases |
| b. decreases* |
| c. does not change |
| BELOW, THE FOLLOWING PROBLEMS ARE BASED ON PAGES 322-28, THE SECOND LAW OF THERMODYNAMICS. FIRST OFF, PAGE 322 'S STATEMENT OF THE SECOND LAW , "Heat of itself never flows from a cold object to a hot object" is consistent with page 326's equivalent statement of the second law, " In natural processes, order tends towards disorder." If heat of itself flowed from cold to hot, then in natural processes, order would not tend toward disorder. |
| 19. In all natural processes |
| a. order tends toward disorder* |
| b. disorder tends toward order |
| 20. In all natural processes |
| a. entropy increases* |
| b. entropy decreases |
| c. entropy does not change |
| 21. True or False. In all natural processes, heat never flows from a cold object to |
| a hot object . |
| a. True* |
| b. False |
| 22. When heat spontaneously flows from a hot object to a cold object, both insulated from the outside world, the total entropy of the two objects |
| a. decreases |
| b. increases* |
| c. remains the same |