Exam 2--PHYS 151--Chapters 3 and 4--S19
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1 Name: Class: Exam 2--PHYS 151--Chapters 3 and 4--S19 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. A softball player catches a ball and brings it to rest. What work has she done on the ball? a. positive work b. negative work c. zero work 2. Work requires both and. a. mass and acceleration b. acceleration and position c. force and displacement d. velocity and mass e. force and acceleration 3. A soccer player kicks a ball up into the air. Describe the transition of energy for the ball after the ball leaves the player s foot, goes up into the air, and returns to the ground. a. potential alternative potential b. chemical potential kinetic c. potential kinetic potential d. kinetic potential kinetic 4. Which of these is a unit for energy or work? I. joule II. calorie III. Newton*meter IV. watts a. III & IV b. I, II, and IV c. I & II d. I, II, and III 5. Which of these best describes heat? a. a rise in potential energy b. the storing of energy in the bonds between atoms and molecules c. the transfer of thermal energy d. the increase in temperature for an object 6. Consider this roller coaster. At which location does the cart have the highest speed? a. A b. B c. C d. D e. the cart has the same speed at all locations 7. Consider the previous roller coaster. Where does the object have the most potential energy? a. A b. B c. C d. D 8. You push a cart with a force of 10 N over a distance of 5 m. By how much have you increased the energy of the cart? a. 2 J b. 10 J c. 50 J d. 0.5 J 9. Chemical energy arises from a. the energy of the molecular bonds in the material b. the speed of the material c. the temperature of the material d. the position of the material 10. Which of these best describes a closed system? a. the system has no energy b. the net work of the system is negative c. no energy enters or leaves the system d. the system has no moving parts 1
2 11. Which of these is a nutrient? I. lipids II. carbohydrates III. protein IV. vitamins and minerals V. water a. I, II, and III b. IV only c. I, I, III, and IV d. all of these 12. Which of these has the highest energy density? a. proteins b. water c. lipids d. carbohydrates 13. Carbohydrates are derived mostly from. a. plants b. animal products c. manmade products 14. The body is about 20% efficient in converting energy from food into usable work. Then, if you consume 100 Cal of food, how much physical work will you be able to perform? a. 120 Cal b. 80 Cal c. 100 Cal d. 20 Cal 15. What is BMR? a. the total energy used by the body to perform all of its functions b. the energy required by the body to exercise c. the energy lost by the body d. the rate at which the body converts energy into heat while resting 16. What is the primary means by which the body loses thermal energy? a. evaporation b. convection c. conduction d. radiation 17. Which of these is a way the body responds when it is cold and needs to be warmer: I. Sweating II. Shivering III. Dilation of blood vessels in the skin IV. Decrease rate of blood flow a. III & IV b. II & III c. I, III, & IV d. II only e. none of these 18. Which of these is closest to the typical BMR for a person? a cal/day b cal/day c cal/day d cal/day 19. Consider these materials, listed with their specific and latent heats. Use the data to answer the following set of questions. Material Specific Heat (cal/g/c) Latent Heat of Fusion (cal/g) Water Lead Silver Latent Heat of Vaporizatio n (cal/g) Which material requires more energy to increase its temperature? a. water b. lead c. silver d. all the same 20. When the materials are at their melting points, which material will require more energy to go from solid to liquid phases? a. water b. lead c. silver d. all would require zero energy 2
3 21. One of these is also called the latent heat of melting. Which one? a. specific heat b. latent heat of fusion c. latent heat of vaporization 22. Convection is a method of heat flow. What does it require? a. movement of a fluid b. contact between two objects c. evaporation of water d. emitting of light 23. Pieces of metal and plastic are in the same room; the room has a constant temperature. Which statement about them is true? a. the plastic is warmer than the metal because its heat of fusion is larger b. the plastic feels cooler because it is a solid c. the metal feels cooler because it has a higher thermal conductivity d. the metal is cooler than the plastic because its specific heat is smaller 24. The following describes thermal conduction. The thermal conduction through a material is 2 kcal/s. If the material is changed and the new material has twice the thermal conductivity, what is the new rate of thermal conduction? Q = k A T d t a. 0.5 kcal/s b. 1 kcal/s c. 2 kcal/s d. 4 kcal/s e. 8 kcal/s 25. The temperature of the human body, in degrees Celsius, is about... a. 20 C b. 40 C c. 80 C d. 100 C 26. Select the true statements: I. It is possible to have liquid water at 0 C. II. Steam can exist at 120 C. III. The boiling point of water is 180 C. IV. The freezing point of water is zero Kelvin. a. III & IV b. I only c. I & IV d. I & II e. none of these are true 27. Which of these may result in hearing loss? I. Buildup of earwax II. Middle ear infection III. Loss of hair cells IV. Perforation of eardrum a. I & II b. I, II, & III c. III & IV d. All of these 28. The speed of sound in air is 760 mph. What are the speeds of sound in water and steel? (Hint: Consider the relative sizes of the speeds.) a. v water = 820 mph ; v steel =640 mph b. v water =3400 mph ; v steel =11,400 mph c. v water =320 mph ; v steel =180 mph d. v water =480 mph ; v steel =13,000 mph 29. You stand 1 meter from a point source of sound, and the intensity is I. If you move 0.5 meters closer (ie. half), what is the new intensity? a. 2I b. ½I c. ¼I d. I e. 4I 3
4 30. Consider this diagram for the next set of questions: 35. True or false: The microphone and speaker operate by the same mechanisms. a. True b. False db is times as intense as 80 db. a b. 20 c. 0.8 d. 100 e Which of these is called the cochlea? a. (2) b. (4) c. (5) d. (6) e. (7) 31. Which part commonly can become blocked resulting in an ear infection? a. 2 b. 3 c. 5 d Which part has a shape that helps to collect sounds of certain frequencies? a. 1 b. 2 c. 4 d Which of these is part of the middle ear? a. 2 b. 4 c. 6 d The ossicles serve this purpose: a. to maintain balance b. to convert vibrations into an electrical signal c. to increase the force from the eardrum onto the cochlea d. to amplify the intensity of the sound wave 37. Which of these statements is true? I. Pitch is associated with a wave s frequency. II. Volume is associated with a wave s amplitude. a. I b. II c. both are true d. both are incorrect 38. A vibrating string produces a sound of a certain frequency. What happens to the frequency if the mass of the string is increased? a. it increases b. it decreases c. it remains the same 39. You have a guitar. Which of these can you do to make a sound have a lower pitch? I. increase the tension in the string II. increase the length of the string III. increase the mass of the string a. I & III b. I & II c. II & III d. all of these 40. The pitch of an individual s voice is modulated by changing. a. the tension of the vocal cords b. the size of the glottis c. the mass of the vocal cords d. the length of the vocal cords 4
5 41. Consider this figure. What is the part labeled (2)? 46. The speed of a wave is dependent on its. a. frequency b. wavelength c. medium d. all of these e. none of these 47. Which of these shows the wavelength of this transverse wave? a. vocal cords b. larynx c. thyroid d. trachea e. glottis 42. Noise-canceling headphones operate because of. a. selecting out particular frequencies b. amplification of sound c. radio waves d. the interference of sound waves 43. At the most basic level, ultrasound machines measure. a. the size of an object b. the distance to an object c. the wavelength of a sound wave d. the time for sound waves to travel 44. The Bernoulli principle states that when the velocity of a fluid increases, the a. acceleration decreases b. pressure decreases c. force increases d. momentum increases 45. Ultrasound equipment could operate at which of these frequencies? a. 20 Hz b. 5,000 Hz c. 10,000,000 Hz d. 0.1 Hz a. A b. B c. C d. D 48. Transverse waves cause the medium to move. a. side to side b. they do not move the medium c. both up-and-down/side-to-side d. up and down. 49. A wave is a wave. a. pressure; longitudinal b. water wave; longitudinal c. sound; transverse 50. For an object in simple harmonic motion, if you increase the displacement from the equilibrium position, the restoring force. a. increases b. decreases c. stays the same 51. Which has a bigger spring constant? a. a Slinky b. the springs on your car c. the spring on Tigger s bottom 5
6 52. The velocity of a wave is 2 m/s. Its period is 2s. What is the wavelength of the wave? a. 1 m b. 2 m c. 4 m d. 0.5 m 53. Consider the previous question. What is the frequence of the wave? a. 2 Hz b. 1 Hz c. 4 Hz d. 0.5 Hz 54. Who is Dr. Young s favorite student? a. Onni Loiske b. John Boudreaux c. Olivia Gauthreaux d. ME!!!! 6
7 ID: A Exam 2--PHYS 151--Chapters 3 and 4--S19 Answer Section MULTIPLE CHOICE 1. ANS: B PTS: 1 REF: S19 2. ANS: C PTS: 1 REF: S19 3. ANS: D PTS: 1 REF: S19 4. ANS: D PTS: 1 REF: S19 5. ANS: C PTS: 1 REF: S19 6. ANS: B PTS: 1 REF: S16, S19 7. ANS: A PTS: 1 REF: S19 8. ANS: C PTS: 1 REF: S19 9. ANS: A PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: D PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: D PTS: 1 REF: S ANS: D PTS: 1 REF: S ANS: D PTS: 1 REF: S ANS: D PTS: 1 REF: S17, S ANS: C PTS: 1 REF: F18, S ANS: A PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: D PTS: 1 REF: S ANS: B PTS: 1 REF: S17, S ANS: D PTS: 1 REF: S17, S ANS: D PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: E PTS: 1 REF: F18, S ANS: D PTS: ANS: C PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: D PTS: 1 REF: F18,S ANS: C PTS: 1 REF: S ANS: B PTS: 1 REF: S17, S ANS: C PTS: 1 REF: S19 1
8 ID: A 40. ANS: A PTS: 1 DIF: F18, S ANS: D PTS: 1 REF: F18, S ANS: D PTS: 1 REF: F18,S ANS: D PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: D PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: D PTS: 1 REF: S ANS: D PTS: 1 2
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