ACT Past Papers with Answers

Paper 48

ACT April 2013

Form 71G · Science Test · 40 questions

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Paper 48 · ACT April 2013 · Form 71G · Science Test

000,000 e) 2,000 800,000 o) 600,000 400,0 s 500 200,(K)O s 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 year * I metric ton = 1,000 kg Figure adapted from M. J. Tremblay, 'Snow Crab (Chlonoecetes opilio) Distribution Limits and Abundance Trends on the Scotian Sh81f." (91997 by Journal of Northwest Atlantic Fishery Sci8nce. ACT-71G 38 GO ON TO THE NEXT PAGE. www. actmi. net 40000000004 l. According to the figure, the estimated number of l- to 3-year-old cod present in 1980 was approximately: 100,000. 200,000. 600,000.

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Paper 48 · ACT April 2013 · Form 71G · Science Test

Based on the figure. the mass of snow crab caught was closest to 500,000 kg in which of the following years? ACT-71G www. actmi. net 39 GO ON TO THE NEXT PAGE. 40000000004 Passage 11 Bone mineral density (BMD) is an indicator of overall bone health. Low BMD increases the risk for bone fracture. Scientists have determined that BMD is linked to dietary intake. Two studies, one with huTnans and one with rats, examined the effect of caffcinated cola consumption on BMD. Key caffeinated cola E] drinking water 90 * 80 70 60 Study J A food-and-drink questionnaire was given to 1,413 adult women who had all average age 0158.2 yr. Each woman was assigned to l of 5 groups according to her caffeinated cola consumption. The average BMD for each group is shown in Figure l. $ 0.89 M 0.88 Note: Bars are stacked. Figure 2 Figure 3 shows, for each group, the average BMD on Day 30. caffeinated cola consumption (servings/week) Figure I Figure 1 adapted from Katherine L. Tucker et al., "Colas, but Not Other Carbonated Beverages, Are Associaled with Low Bone Min- eral Density in Older Wom8n: The Framingham Osteoporosis Study.. Q2006 by American SocSety for Nutrition. 00 Study 2 Thirty 10-week-old rats were divided into 4 groups: Groups l and 2 consisted of 10 male and 10 female rats, respectively; Groups 3 and 4 consisted of 5 male and 5 female rats, respectively. Each rat in Groups l and 2 was provided with unlimited supplies of a solid rat food, di'ink- ing water, and caffeinated cola for 30 days. Each rat in Groups 3 and 4 was provided with unlimited supplies of the rat food and drinking water, but no cola, for 30 days. Figure 2 shows, for each group, the average daily caf- feinated cola consumption per raL the average daily drink- ing water consumption per rat. and the average daily total fluid consumption per rat. Figure 3 Figur8s 2 and 3 adapted from Recai Ogur et al., "Evaluatlon of the Effect of Cola Drinks on Bone Mineral Density and Associated Fac- tors." (02007 by Nordic Phamiacological Society. ACT-71G 40 GO ON TO THE NEXT PAGE. www. actmi. net 40000000004

A1980B1987C1991D1994 0.90 0.87 0.86 0.85 0.83 0.18 0.16 0.10 0.06 0.02 0.00

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Paper 48 · ACT April 2013 · Form 71G · Science Test

As M My increases. stellar surface temperature decreases. Based on Table I, is the surface temperature lower for the particular stars in SC III or for the partic- ular stars in SC IV ? sc Iv. for SC IV. Sc. for SC III. 28 28 27 27 26 26 *W = watts ACT-71 G 49 GO ON TO THE NEXT PAGE. www. actmi. net 40000000004 Passage Vll Study I R was determined for ions having different V (see Table l). Each ion had a Q of + I, and B equaled 0.10 tesIa (T). When an ion moves through a uniform magnetic field, the ion follows a circular path having a radius R. A group of students conducted 3 studies to determine R under a variety of conditions for ions having the same mass. The students used an apparalus consisting of an ion source, a met<ll plate with a hole in it, a power supply for generating various voltages between the ion source and the metal pIate, and a movable charged-particle detector. Figure I shows the apparatus with the detector positioned to detect particular ions. Table I Trial (m/sec) (m) 3,000 4,500 6,000 7,500 ion path Study 2 was detern]ined for ions having various Q (sce Table 2). Each ion had a V of 7,500 m/sec, and B equaled O.IOT. power supply metal plate detector ion source Table 2 top view Note: The black dots represent the uniforni magnetic field. Trial (m) +2 +3 +4 Figure I Figure 1 adapted from John D. Cutnell and Kenneth W. Johnson, Physics, 7th ed. 2007 by John Wiley and Sons, Inc, Study 3 R was determined for various B (see Table 3). Each ion had a Q of +1 and a V of 7,500 m/sec. In each trial, the following occurred: Ions with the same electrical charge. Q. as well as the same mass were emitted by the ion source. The ions sped up, due to the voltage provided by the power supply. uiitil thcy reached the hole in the plate. At the hole. their speed was V. After passing through the hole, they entered a uniform magneti field of strength B. Under the influence of the field, they traveled along a circular path, still at speed V. The studcnts moved the detector from side to side until it intercepted the ions and detected them. The students measured the distance between the hole in the metal plate and the ions, point of entry into the detector; R equaled this distance divided by2. Table 3 Trial (T) (m) 10 ACT-71G www. actmi. net 50 GO ON TO THE NEXT PAGE. 0000000004

ASC III. because M - My Is less for SC III than forBSC III, because M - My 18 greater for SC III thanCSC IV, because M - My is less for SC IV than forDSC IV, because M - My is greater for SC IV than 0.056 0.084 0.112 0.140 0.070 0.047 0.035 0.352 0.176 0.117 0.08 0.12

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Paper 48 · ACT April 2013 · Form 71G · Science Test

Based on Figure I, the distance each ion traveled along its path from the time it left the hole in the metal plate until the time it entered the detector is given by which of the following expressions? from hole to detector magnitude of velocity direction of velocity magnitude of velocity direction of velocity END OF TEST 4 STOPI DO NOT RETURN TO ANY OTHER TEST. ACT-71 G 51 Form 18J (XQ) ACT" Writing Test Prompt (April 2013) Lawmakers debate whether businesses and factories located Iiear schools should be required to eliminate the pollutants and haimful emissions they release into the air. Soine lawmakers support such a i-equiiemeiit because tliey think schools, leaining environments shoiild iiiclude sale and healthy air for students to bieathe. Other lawinakers do not suppoit such a requirement because they think it would force businesses and factories located Iiear schools to close oi" move, which could hui"t local economies. In your opinion, should businesses aiid factories located near schools be required to elimiiiate the pollutants and harmful emissions they release into the ali"? In your essay, lake a position on this question. You may wiite piesent a different point of view on this question. Use specific reasons and exainples to support your position. 20134ACT+71G,#$ English Mathematics Readling Science 1 A 36 F 1 C 31 C 1 A 1 D 2 F 37 D 2 K 32 F 2 J 2 F 3 D 38 H 3 A 33 E 3 B 3 A 4 J 39 B 4 J 34 J 4 H 4 F 5 D 40 J 5 A 35 B 5 B 5 B 6 H 41 A 6 K 36 H 6 J 6 G 7 A 42 F 7 E 37 C 7 C 7 D 8 J 43 B 8 G 38 G 8 G 8 H 9 A 44 F 9 E 39 B 9 A 9 D 10 H 45 C 10 G 40 K 10 F 10 H 11 D 46 J 11 A 41 D 11 D 11 A 12 H 47 B 12 H 42 K 12 H 12 J 13 D 48 H 13 D 43 C 13 B 13 C 14 G 49 C 14 H 44 G 14 J 14 F 15 C 50 J 15 E 45 E 15 B 15 B 16 G 51 C 16 H 46 G 16 G 16 H 17 D 52 J 17 B 47 D 17 C 17 D 18 G 53 C 18 K 48 F 18 F 18 G 19 B 54 J 19 C 49 C 19 D 19 B 20 J 55 B 20 G 50 F 20 H 20 H 21 D 56 F 21 A 51 B 21 C 21 C 22 H 57 C 22 H 52 F 22 G 22 G 23 B 58 F 23 B 53 D 23 C 23 D 24 J 59 A 24 H 54 J 24 F 24 F 25 A 60 G 25 E 55 A 25 C 25 C 26 H 61 D 26 J 56 J 26 J 26 H 27 C 62 H 27 D 57 E 27 D 27 A 28 H 63 D 28 H 58 F 28 H 28 J 29 B 64 F 29 D 59 E 29 D 29 D 30 H 65 C 30 F 60 F 30 J 30 J 31 C 66 F 31 A 31 B 32 G 67 B 32 F 32 G 33 A 68 G 33 A 33 C 34 F 69 D 34 G 34 J 35 B 70 F 35 C 35 D 71 D 36 J 36 H 72 G 37 B 37 B 73 B 38 H 38 F 74 J 39 A 39 A 75 C 40 J 40 H Explanation of Procedures Used to Obtain Scale Scores from Raw Scores On each of th8 four tests on which you rnarked any responses, the total number of correct responses yields a raw score. Us8 the table below to convert your raw scores to scale scores. For each test, locate and circle your raw score or the range of raw scores that includes it in the table below. Then, read across to either outside column of the table and circle the scale score that corresponds to that raw score. As you determine your scale scores, enter them in the blanks provided on the right. The highest possible scale score for each test is

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Form 71G · Science Test · 40 questions

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