Workspace Science Test 40
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OFFICIAL ACT Form F12 · June 2023

Science

35 questions ~9 min recommended
00:00
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=== Passage I ===
A zero-age main sequence (ZAMS) star is a star in which the hydrogen nuclei in its core have just begun the process of fusion (the combining of light nuclei to form heavier nuclei). The table below shows the mass, luminosity (total power output), radius, surface temperature, core temperature, and core density of each of 8 ZAMS stars.

=== Passage II ===
Sorghum, rapoko, and millet are 3 crops grown in a particular region. Table1 shows, for each of 14 growth seasons (Seasons 1−14), the yield of each crop, in metric tons (MT).

=== Passage III ===
Two studies examined how the concentration of Drug M in water affects the accumulation of Drug M in the bodies of a species of planarian (a freshwater flatworm) and the swimming speed of those planarians.

=== Passage IV ===
A Crooke’s radiometer (CR) is a sealed glass bulb, from which most of the air has been removed, that contains 4 metal vanes mounted on a spindle.

=== ... ===
...

1. The rate at which a ZAMS star fuses hydrogen into helium is directly proportional to the core temperature of that star. Based on the table, is the rate of fusion more likely greater for a 3 M ZAMS star or for a 9 M ZAMS star?

2. According to the table, as mass increases from 3M to 30M, does radius increase or decrease, and does core density increase or decrease?

3. An astronomer observes a ZAMS star with a surface temperature of 27,000 K. Based on the table, this star’s luminosity is most likely closest to which of the following values?

4. Based on the table, what is the approximate temperature difference between the surface of the 30 M ZAMS star and the surface of the 1.5 M ZAMS star?

5. According to the table, what is the mass of the ZAMS star that has a core temperature closest to 25,000,000 K?

6. Based on the table, what is the mass of 1 cubic meter (1 m3) of material in the core of the 1.5 M ZAMS star?

7. For which growth season was the amount of rainfall received closest to the region’s average rainfall per season?

8. Season 9 and Season 11 had the same amount of rainfall, but Season 9 had more dry spells (30 days or more with no rain) than did Season 11. Based on Table 1, did the greater number of dry spells in Season 9 more likely have a positive effect or a negative effect on the yield of sorghum?

9. Based on Figure 1 and Table 1, for the growth season with the least amount of rainfall, which of rapoko or millet had the larger yield, and what was the yield for that crop?

10. The rainfall deviation in centimeters for Season 1 was closest to which of the following values?

11. Does Figure 1 show the variation in an abiotic factor or a biotic factor in the region?

12. Based on Figure 1, if an incubation time of 60 hr had been tested in Study 1, the average BML for the planarians incubated in the 0.20 mg/L aqueous solution of Drug M would most likely have been:

13. A student hypothesized that, as the concentration of Drug M in the solutions increased, the average BML of the planarians would increase only. The results for how many of the incubation times tested in Study 1 are consistent with this hypothesis?

14. Which of the following statements about the effect of a Drug M concentration of either 0.05 mg/L or 1.80 mg/L on average swimming speed is consistent with the results of Study 2?

15. Based on the results of Study 2, for the 0.20 mg/L aqueous solution of Drug M, which of the incubation times tested would most likely result in the greatest average concentration of this protein in the body tissues of the planarians?

16. Based on the explanation given by Student 1, which of the following plots best shows the predicted relationship between the brightness of light and the rotational speed of the CR vanes?

17. Regardless of which student might be correct, for the CR to function as described, which of the following statements about the glass that composes the bulb of the CR must be accurate?

18. In the process of thermal transpiration, gas molecules move from a cooler area to a warmer area. Is thermal transpiration more likely occurring in the process described by Student 3 or in the process described by Student 4?

19. Suppose that the silver sides of the vanes in the CR shown in the diagram had been painted white instead. Further suppose that when placed in light the vanes of this CR still rotated. Would this finding be consistent with the explanation given by Student 3?

20. Suppose that, when a photon is reflected by a surface, it exerts twice as much force as when it is absorbed by a surface. This information is consistent with the explanation given by which student: Student1 or Student 2?

21. Consider the statement 'The brighter the light in which a CR is placed, the greater the kinetic energy of its vanes.' This statement is consistent with the explanations given by which students?

22. What is the order of Pb, Sb, and Sn from the substance with the smallest accepted C to the substance with the greatest accepted C?

23. How many protons are in an atom of the metal that had an average experimental C of 0.217 J/g·°C?

24. Which of the metals tested in the experiment had the greatest absolute difference between the average experimental C and the accepted C?

25. Based on the results of the experiment and additional information from the passage, did the greatest average ΔT value more likely result from the trials performed with Al or from the trials performed with Pb?

26. For the 5 metals tested in the experiment, as the atomic number increased, the average experimental C:

27. Based on the results of the experiment, the percent error for the specific heat of Cu is best calculated using which of the following expressions?

28. Based on the experimental procedures, in each trial, a total of approximately how many temperature values were recorded?

29. According to the results of the study, did the injection of CCP grout reduce the SO2− content of the groundwater flowing out of the mine?

30. How many months after the injection of the CCP grout was the next set of water samples collected?

31. Consider the description of the chemical interaction that forms ions found in AMD. Which of FeS, H2O, and SO2− would be considered a reactant, and which of FeS, H2O, and SO2− would be considered a product, in this interaction?

32. Which of the following statements best summarizes the intended role of CCP grout in the coal-mining industry?

33. Which of the following was a dependent variable in the study?

34. If the CCP grout injection had occurred on August 1, 1997, instead of on August 1, 1996, the pH of the groundwater flowing out of the mine on July 1, 1997, would most likely have been closest to which of the following?

35. According to the description and results of the study, before August 1, 1996, how many samples were collected at the location where groundwater flowed out of the mine?