MCAT_Full_Length3 - 03 MCAT FL Test3 06/27/2003 10:25 AM...

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Physical Sciences Time: 100 Minutes Questions 1–77 DO NO T BEGIN THIS SECTION UNTIL Y OU ARE T OLD T O DO SO . 03 MCAT FL Test3 06/27/2003 10:25 AM Page 1
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2 GO ON TO THE NEXT PAGE. PHYSICAL SCIENCES DIRECTIONS: Most of the questions in the Physical Sciences test are organized into groups, with a descriptive passage preceding each group of ques- tions. Study the passage, then select the single best answer to each question in the group. Some of the questions are not based on a descriptive passage; you must also select the best answer to these questions. If you are unsure of the best answer, eliminate the choices that you know are incorrect, then select an answer from the choices that remain. Indicate your selection by blackening the corresponding circle on your answer sheet. A periodic table is provided below for your use with the questions. 1 H 1.0 2 He 4.0 3 Li 6.9 4 Be 9.0 5 B 10.8 6 C 12.0 7 N 14.0 8 O 16.0 9 F 19.0 10 Ne 20.2 11 Na 23.0 12 Mg 24.3 13 Al 27.0 14 Si 28.1 15 P 31.0 16 S 32.1 17 Cl 35.5 18 Ar 39.9 19 K 39.1 20 Ca 40.1 21 Sc 45.0 22 Ti 47.9 23 V 50.9 24 Cr 52.0 25 Mn 54.9 26 Fe 55.8 27 Co 58.9 28 Ni 58.7 29 Cu 63.5 30 Zn 65.4 31 Ga 69.7 32 Ge 72.6 33 As 74.9 34 Se 79.0 35 Br 79.9 36 Kr 83.8 37 Rb 85.5 38 Sr 87.6 39 Y 88.9 40 Zr 91.2 41 Nb 92.9 42 Mo 95.9 43 Tc (98) 44 Ru 101.1 45 Rh 102.9 46 Pd 106.4 47 Ag 107.9 48 Cd 112.4 49 In 114.8 50 Sn 118.7 51 Sb 121.8 52 Te 127.6 53 I 126.9 54 Xe 131.3 55 Cs 132.9 56 Ba 137.3 57 La * 138.9 72 Hf 178.5 73 Ta 180.9 74 W 183.9 75 Re 186.2 76 Os 190.2 77 Ir 192.2 78 Pt 195.1 79 Au 197.0 80 Hg 200.6 81 Tl 204.4 82 Pb 207.2 83 Bi 209.0 84 Po (209) 85 At (210) 86 Rn (222) 87 Fr (223) 88 Ra 226.0 89 Ac † 227.0 104 Rf (261) 105 Ha (262) 106 Unh (263) 107 Uns 108 Uno (265) 109 Une (267) * 58 Ce 140.1 59 Pr 140.9 60 Nd 144.2 61 Pm (145) 62 Sm 150.4 63 Eu 152.0 64 Gd 157.3 65 Tb 158.9 66 Dy 162.5 67 Ho 164.9 68 Er 167.3 69 Tm 168.9 70 Yb 173.0 71 Lu 175.0 90 Th 232.0 91 Pa (231) 92 U 238.0 93 Np (237) 94 Pu (244) 95 Am (243) 96 Cm (247) 97 Bk 98 Cf (251) 99 Es (252) 100 Fm (257) 101 Md (258) 102 No (259) 103 Lr (260) PERIODIC TABLE OF THE ELEMENTS 03 MCAT FL Test3 06/27/2003 10:25 AM Page 2
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Passage I (Questions 1–6) Historically, two different methods have been used to estimate the fluid pressure in capillary beds. Method 1 A glass pipette is inserted into the capillary. The level of blood rising in the pipette is measured and used to cal- culate the pressure. Alternatively, an inert fluid of density ρ can be placed in the pipette and its height h can be mea- sured. The pressure in the capillary is given by ρ gh, where g is the acceleration due to gravity. Figure 1 Method 2 The pressure can be measured indirectly in the follow- ing way. A section of gut tissue is removed from a speci- men and placed on a beam balance. Blood is circulated through the tissue by a pump. The arterial pressure is then decreased. This leads to a decrease in the capillary hydro- static pressure in the gut capillaries. The constant osmotic pressure of plasma proteins in the capillary causes absorp- tion of fluid from the gut section which will decrease its weight. To prevent a change in the weight of the gut sec- tion, the venous pressure is increased. This tends to increase the capillary pressure, reducing the flow of fluid from the gut tissue into the capillaries. The capillary pres- sure is thus held constant (and the balance kept level) as the arterial pressure is decreased and the venous pressure increased. The arterial and venous pressures meet at the capillary pressure being measured.
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This note was uploaded on 06/07/2009 for the course ENGLISH 123 taught by Professor Soft during the Spring '09 term at University of Washington.

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MCAT_Full_Length3 - 03 MCAT FL Test3 06/27/2003 10:25 AM...

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