Final Exam Part 1  Nota means none of the above.

 
1. To say that evaporation is a cooling process is to say that the  
a. more energetic molecules in  water  escape*
b. more energetic molecules  remain in the water 
c. the less energetic molecules escape the water  
d.  nota
2. After taking a hot shower,  suppose you remain in the humid  shower stall after you turn the water off. You will feel  no change in body temperature if 
a. evaporation exceeds condensation
b. condensation exceeds  evaporation 
c. as much moisture condenses as evaporates*
d nota
3. True or False. When a gas is changed to a liquid,   gas molecules  transfer  some of their kinetic energy to the liquid. 
a. True*
b. False
4.When heat is removed from freezing water,  its temperature 
a. increases
b. decreases 
c. does not change*
d. nota
5. You go on a camping trip at high altitudes in the Himalayas. When you boil an egg for  lunch in an open pot,  the water temperature will be  
a. higher than at sea level
b. lower than at sea level*
c. the same as at sea level 
6. In the previous problem, the water comes to a boil   
a. in less  time than at sea level* 
b. in more time than at sea level 
c. in the same time as at sea level
d. nota
7. The lowest theoretical temperature is  
a. 0 degrees C
b. 0 K*
c. 273  degrees C
d.   nota
8. 273  K  is equal to  
a. 273 degrees C
b. -273 degrees C
c. 0 degrees C*
d  nota
9. Helium has the special property that its  internal energy is directly proportional  to the average kinetic energy of the molecules. Hence helium's internal energy  is directly proportional to its temperature.   Consider a flask of helium with a temperature of 0 oC. If the helium is  heated until it has twice the internal energy, what is the final temperature? (Hint: convert 0 oC to Kelvin before you compute the final temperature.) 
a.  0 oC
b.  536 K
c.  556 K
d.  546 K*
e.  nota
10. If 1200 J of heat is added to a gas system that does no external work, what is the change in internal energy of the system? 
a. -1200 J
b. 1200  J*
c.  nota
11. In the previous problem,  assume that the internal  energy is directly proportional to the kinetic energy. The temperature of the gas will  
a. increase* 
b. not change, since the gas system does no work
c. decrease
d. nota
12. During a certain thermodynamic process, a sample of gas is compressed by a piston and warms, increasing  its internal energy by 4000 J.  No heat is added or taken away during the process. How much work is done by the sample on the piston? 
a. 4000 J
b. -4000 J*
c. 0 J
d.  nota
13. What is the ideal efficiency of a heat  engine operating between  2700 K and  300 K?  
a. 0.10
b. 0.24
c. 0.80
d. 0.89*
e. nota
14. Two identical blocks, one at 10 degrees C and the other at 20 degrees C, are put in contact. Suppose the cooler block cools to 5 degrees C and the warmer block warms to 25 degrees C. This process would 
a. violate the first law of thermodynamics
b. violate the second law of thermodynamics*
c. violate neither of these
15. As a system becomes more disordered, entropy
a. increases*
b. decreases
c. does not change
16. Two blocks, one warm and the other cool, are put in contact. The direction of heat flow is   
a. from the warm  block to the cool block*  
b. from the cool  block to the  warm block 
17. In the previous problem, the total entropy of the two-block system
a. increases*
b. decreases
c. remains the same
18. How far in terms of wavelength does the crest of a wave travel in  5 periods? 
a. one fifth of a wavelength
b. 5 wavelengths*
c. 2.5  wavelengths
d nota
19. Which of the following is not a longitudinal wave? 
a. wave on a string*
b. sound wave
c. nota
20.The vibrations  of a   wave on a string move in a direction
a. along the direction of wave travel
b. at right angles to the direction of wave  travel*
c. nota
21. If a  transverse wave has wavelength  2 m and frequency  1/6 cycles per second, then the wave speed is     
a. 3 m/s
b. 1/3  m/s*
c.  6 m/s
d. 1/6 m/s
e. nota
22. When the string of a guitar is plucked, what kind of wave results?  
a. standing wave*
b. traveling wave
c. longitudinal wave
23.  Suppose you set up a standing wave with 3 anti-nodes on a string with fixed ends. Including the two fixed ends, how  many nodes does this standing wave have? 
a. 2
b. 3
c. 4*
d. nota
24. A railroad locomotive is at rest with its whistle on. The frequency decreases when it starts moving. The locomotive   
a. moves toward you 
b. moves away from  you* 
c. nota 
25. In the previous problem, the wavelength reaching your ear will 
a. increase *
b. decrease 
c. remain the same
26. Assuming the wave speed does not change, when the wavelength  of a wave increases,  the  frequency
a. decreases*
b. increases
c. remains the same
27. Suppose you have two pendulums,  each made by suspending a stone at the end of a string. The pendulum with the the longest period has the 
a. shortest string length
b. longest string length*
c.  nota
28. In the previous problem, the pendulum with the largest frequency has
a. the longest period
b. the shortest period*
c. nota
29. True or False. A sound wave is a transverse wave.
a. True
b. False*
30. True or False. Sound travels in a vacuum. 
a. True
b. False*
31. For each degree rise in temperature above 0 degrees C, the speed of sound in air
a. decreases by 0.6 m/s
b. increases by 0.6 m/s*
c. nota
32. At  0 degrees C, the speed of sound in air is about  
a. 330 m/s*
b. 300,000,000 m/s
33. The speed of sound in water is about
a. 1320 m/s*
b. 82.5 m/s
34. The speed of sound in steel is about
a. 660 m/s
b. 990 m/s
c. 4950 m/s*
35. When the handle of a vibrating tuning fork is held solidly against a table, the sound becomes 
a. softer
b. louder*
c. remains the same
36. An object will resonate if the frequency of the forced vibration is
a. less than the object's  natural frequency. 
b. equal to the object's  natural frequency.* 
c greater than the object's natural frequency
d. nota
37.  Caruso is said to have made a crystal chandelier shatter with his voice. This is an example of 
a. sound refraction
b. sound reflection
c. interference
d. resonance*
e. nota 
38. True or False. Two sound waves can interfere with one another so that no sound results. 
a. True*
b. False
39. You are standing near two speakers. The two waves arriving at your ears would interfere constructively if 
a. the path lengths from the speakers are the same or differ by a whole  multiple of a wavelength (1 wavelength, 2 wavelengths, 3 wavelengths, etc)* 
b. the path lengths from the speakers differ by half a wavelength or by a odd multiple of half a wavelength [( 3/2)*wavelength, (5/2)*wavelength, (7/2)*wavelength, etc] 
40. In the previous problem, the two waves arriving at your ears would interfere destructively if
a. the path lengths from the speakers are the same or differ by a whole  multiple of a wavelength (1 wavelength, 2 wavelengths, 3 wavelengths, etc) 
b. the path lengths from the speakers differ by half a wavelength or by a odd multiple of half a wavelength [( 3/2)*wavelength, (5/2)*wavelength, (7/2)*wavelength, etc]* 
41.What force binds atoms together to form molecules ?
a. gravitational
b. electrical  *
c. nota 
42.  In an electrically neutral atom, the number of protons in the nucleus is equal to the number of  
a. electrons that surround the nucleus*
b. neutrons in the nucleus
c. nota
43. The magnitude of the  electric force between two charges depends only on the 
a. the product of the  two charges
b. the product of the  two charges and the separation distance*
c. the separation distance
44. An electron and a proton 
a. repel each other
b. neither attract or repel each other
c. nota*
45. Two charges separated by 2 meters repel each other with a 12-N force on each other. The two charges 
a. are of the same sign*
b. are of opposite signs
c. nota
46. In the the previous problem, if the magnitude of each charge is doubled, then  the force on each charge will be  
a. 24 N
b. 48 N*
c. 84 N
d. 168 N
e. nota
47. In Problem 45,    if the two charges are pulled to a separation distance of 4 meters, the force of  attraction on each other will be 
a. 6 N
b. 3 N*
c. 1/6 N
d. 1/12 N
e. nota
48. Suppose that the strength of the electric field at a certain distance from an isolated point charge has a  value of 16  N/C . If the distance is doubled, then the electric field will have the value 
a. 8 N/C
b. 4 N/C*
c. 1 N/C
d. nota
49. Suppose you place a free  electron in an  electric field that points vertically down. The electric force on the electron will point
a. up*
b. down
50. Suppose you place a free proton in an electric field that points vertically  up. The electric  force on the proton will point
a. up*
b. down
51.  Suppose  you  expended  30 Joules of work to push a 5-coulomb test charge in a direction opposite (against) an electric field. What would be the gain in potential energy of the test charge?
a. 10 Joules
b. 30 Joules*
c. 40 Joules
52. In the previous problem, what is  the change  in potential  between the  test charge's  initial location and the test charge's final  location?
a. 6 Volts*
b. 5 Volts
c. 30 Volts
d. nota