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 |