Exam 2--PHYS 151--Spring 2017
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1 Name: Exam 2--PHYS 151--Spring 2017 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Consider this diagram of a human heart. Which section is the right ventricle? a. A b. B c. C d. D e. E 2. Just before going through the systemic circuit, blood travels through this part of the heart. a. A b. B c. C d. D e. E 3. Blood flowing through the pulmonary circuit goes to. a. the aorta b. the brain c. all of the body d. the lungs e. the pulmate 4. In which of these parts of the circulatory system is the blood pressure highest? a. aorta b. capillaries c. arteries d. veins e. vena cava 5. You are adminstering a drug via a gravity-fed IV. The fluid is flowing at 10 drops/minute. How can you increase this rate of adminstering the drug? I. Raise the IV bag II. Increase the viscocity of the fluid III. Increase the radius of the needle and tubing IV. Squeeze the IV bag a. I & IV b. I, III, and IV d. I only e. all of these 6. The diastolic pressure occurs when the. a. heart relaxes. b. heart contracts c. arteries contract d. arteries relax 7. Which of these physical properties of urine in the bladder cause a person feel an urge to go? a. force b. mass c. pressure d. volume 8. The vitreous humor serves which function? a. to keep the shape of the eyeball b. to focus light onto the retina c. to provide nutrients to the eye d. to separate the cornea and lens 9. The Iron Lung utilizes which of these laws? a. Newton s b. Charle s c. Boyle s d. Pascal s 10. Glaucoma is the result of. a. a high pressue in the aqueous humor b. blocked drainage of the vitreous humor c. detachment of the retina d. none of these 1
2 11. Consider this roller coaster. At which location does the cart have the most kinetic energy? a. A b. B c. C d. D e. the cart has the same KE at all locations 12. The human body is about 25% efficient at converting food to a usable form of energy. If a person consumes 100 Calories, how much of that energy is lost to some unusable form? a. 25 Cal b. 50 Cal c. 75 Cal d. 100 Cal 13. Friction tends to do work. a. positive b. negative c. zero 14. I move an object of mass m to a height h. What work have I done on this object? a. mg/h b. mgh c. m/(gh) d. F/h 15. A car accerates from 0 30 miles/hour. Then, it goes from miles/hour. Which requires more energy? a miles/hour b miles/hour c. both the same d. it depends on the mass of the car 16. A circus acrobat uses a Russian bar, which is a flexible bar used to launch a person into the air. Which of these best describe the order of energy conversions as the acrobat goes from ground level to her highest point? (KE: kinetic energy; PE: potential energy) a. elastic PE KE gravitational PE b. KE elastic PE gravitational PE c. gravitational PE KE d. KE elastic PE 17. This figure shows three blocks; each is moving to the right. Which of the forces F is doing positive work? a. a b. b c. c d. all of these 18. Power is defined as a. Energy/Work b. Energy*time*time c. Energy*time d. Energy/time 19. Which of these is a unit for power? a. calorie b. joule c. watt d. Newton*meter 20. Which of these is the best definition for a closed system? a. a system for which the energy never changes form b. a system for which energy can enter but not leave the system c. a system for which energy can leave but not enter the system d. a system for which energy neither leaves nor enters 2
3 21. Which of these are types of energy? I. Kinetic II. Efficient III. Elastic IV. Acoustic a. I, III, and IV b. I only d. I & III e. all of these 22. The temperature of the human body, in degrees Celsius, is about... a. 20 C b. 40 C c. 80 C d. 100 C 23. You sweat and lose 0.5 liter (or 0.5 kg) of fluids. How much thermal energy does your body lose due to this process? (The specific heat of water is 1 kcal/(kg C); the latent heat of vaporization for water is 500 kcal/kg; the latent heat of fusion for water is 80 kcal/kg.) a. 0.5 kcal b. 40 kcal c. 20 kcal d. 250 kcal 24. Sweating necessarily requires which of these modes of energy transfer? a. conduction b. convection c. radiation 25. After a marathon, runners are often given a thin, foil-like blanket to help them keep warm. Why do they use this particular material? a. the material keeps the wind off of the athletes b. the material reduces energy lost to conduction c. the material absorbs energy from the Sun d. the material reflects radiation back on the body 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. I & IV b. I & II c. III & IV d. I only e. none of these are true 27. Consider this equation which describes the rate of themal energy flow between two objects. Which of these materials will have a higher value for k? Q = k A T d t a. air b. water c. copper d. wood e. it depends on the size of the object 28. You have two stirring rods made of the same metal. They are the same length, but one of the rods has a greater radius. You want to stir a very hot liquid, but would rather not burn yourself with the stirring rod. Which rod should you use? a. the one with a small radius b. the one with a large radius c. it doesn t matter because they are made of the same metal d. it doesn t matter because they have the same length 29. Which of these is an example of heating by radiation? I. an oven cooking bread II. the Sun heating the Earth III. A human body giving off infrared light. a. I & III b. II & III d. III only e. All of these 3
4 30. The kelvin temperature scale is based on the triple point of water (0.01ºC) and. a. boiling point of water b. melting temperature of silicone c. absolute zero d. freezing point of water 31. A material with a high specific heat will. a. require lots of energy to increase its temperature. b. require very little energy to increase its energy. c. have a very high density. d. have a very high thermal conductivity. 32. Which of these is a source of carbohydrates? I. meat II. oils III. breads IV. soft drinks a. I & III b. II & III d. III alone e. III & IV 33. Which is bigger, BMR or TMR? a. BMR is bigger b. TMR is bigger c. it depends on a person s genetic disposition d. they are exactly the same 34. 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. II & III b. II only c. I, III, & IV d. III & IV e. none of these 35. The typical BMR of a person is 65 cal/hour. Then, what is the minimum calorie intake a person needs to function for 24 hours? a cal b. 100 cal c cal d cal 36. The work done to move an object might be 100 cal. However, a person s body might require 500 cal to complete the action. Why is there a discrepancy between the completed work and the required energy? a. the conversion of chemical energy requires more work b. work is always less than energy c. kinetic energy requires more work than potential energy d. muscles are very inefficient 37. Tall thin people usually have a higher BMR because, a. they usually have a bigger mass b. their organs are closer to their skin c. they use more energy to keep warm d. they are tall so their blood pressure is higher 38. The food unit of energy is the a. Calorie b. Joule c. Watt d. calorie 39. Most of the body s heat is lost by which of these mechanisms? a. sweating b. radiation c. convection d. conduction 40. Which of these is a good source of lipids? a. olive oil b. bread c. lean meat d. bananas 41. Hyperthermia is when the body temperature. a. is too high. b. is too low. c. changes too rapidly. d. is hyper. 42. Who am I to Dr. Young? a. a paycheck b. just a student c. The Best!! d. an obstacle 4
5 ID: A Exam 2--PHYS 151--Spring 2017 Answer Section MULTIPLE CHOICE 1. ANS: C PTS: 1 REF: S17 2. ANS: D PTS: 1 REF: S17 3. ANS: D PTS: 1 REF: S17 4. ANS: A PTS: 1 REF: S17 5. ANS: B PTS: 1 REF: S17 6. ANS: A PTS: 1 REF: S17 7. ANS: C PTS: 1 REF: S17 8. ANS: A PTS: 1 REF: S17 9. 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: B PTS: 1 REF: S ANS: B PTS: 1 REF: S16, 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: C PTS: 1 REF: S ANS: D PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: D PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: D PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: C PTS: 1 REF: S16,S ANS: A PTS: 1 REF: S ANS: E PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: E PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: D PTS: 1 REF: S16, S ANS: D PTS: 1 REF: S16, S ANS: C PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: B PTS: 1 REF: S15, S17 1
6 ID: A 40. ANS: A PTS: 1 REF: S16, S ANS: A PTS: 1 REF: S ANS: C PTS: 1 REF: S16, S17 2
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