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OFFICIAL ACT Form G20 · June 2024

Science

25 questions ~9 min recommended
⏱ 00:00
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=== Soil Gas Flow ===
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=== Ballistic Pendulum ===
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=== Saturn's Moons ===
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=== Echolocation in Bats ===
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=== Mushroom Metal Ion Concentration Experiment ===
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=== Analysis of Metals in Mushrooms ===
and then it was stirred at 65°C until the sample mined using an atomic absorption spectrometer (AAS). completely dissolved. The solution was cooled to 25°C, and pure H O was added until the total solution volume was 50.0 mL. In the AAS, a solution containing a mixture of metal ions is slowly misted into a flame. Then, for each type of metal to be analyzed, a beam of light—having a particular wavelength unique to that type of metal—is passed through the flame onto a detector (see Figure 1). Any light that is absorbed by the metal in the flame does not reach the detector. Thus, for a given type of metal, the fraction of light absorbed (the absorbance) is directly proportional to the concentration of that metal ion in solution. The results are shown in Table 1.

1. Suppose that, before the experiment, a scientist had predicted that Variety X mushrooms would have a greater concentration of Mn2+ than Variety Y mushrooms. Are the results of the experiment consistent with this prediction?

2. Which of the following expressions best shows the direction of the flow of soil gas through the apparatus shown in Figure 2?

3. According to Figure 3, the average Rn concentration at the site having the second-largest vertical displacement in Figure 1 in December 2008 was approximately:

4. Based on Figure 3, the average Rn concentration increased between June 2008 and December 2008 at how many of the sites?

5. Which of the following statements best summarizes the December 2008 data for Sites 4−8?

6. Based on the description of the sites, what was the minimum possible distance along the fault line between Site 1 and Site 5?

7. According to Figure 3, the average Rn concentration in June 2008 at Site 3 was closest in value to the average Rn concentration in July 2009 at which of the following sites?

8. Based on Trials 1−4, as v increased, h:

9. What was the absolute value of the difference between the projectile’s speed in Trial 1 and the projectile’s speed in Trial 10?

10. Suppose that a trial had been performed in which M was 1.00 kg and m was 0.060 kg. If the resulting value of h were 0.020 m, v would most likely have been closest to which of the following?

11. What was the independent variable in Trials 9−12?

12. For which trial was GPE greatest?

13. For which of the following moons is the semimajor axis closest to 1 billion meters?

14. Based on Figures 1 and 3, the majority of the moons in Groups 1−4 have orbits that are which shape: circular or elliptical?

15. There is a Group 4 moon with an orbital energy more similar to those of Group 1 moons than to those of the other Group 4 moons. What is the approximate orbital energy of this moon?

16. Based on Figures 2 and 3, for which of the ranges listed below are there no moons plotted?

17. Based on Figures 2 and 4, each moon that has an inclination angle greater than +30° has an orbital energy that is within which of the following ranges of values?

18. Suppose a new moon is discovered in orbit around Saturn and it is classified as a Group 3 moon. Based on Figure 3, which of the following pairs of values for a and e, respectively, most likely corresponds to the orbit of this moon?

19. Which of the following statements was most likely the hypothesis for Study 2?

20. Which of the following statements regarding peak frequency and reproductive fitness is consistent with the results of Study 2? Male R. mehelyi that emit calls with a peak frequency of:

21. Consider the design of Study 2. Which of the following procedures was most likely done to eliminate preference based on the direction the call came from?

22. Based on Table 1, the total number of bat landings in the compartment that played a call with a peak frequency of 104 kHz was approximately how many times as great as the total number of bat landings in the compartment that played a call with a peak frequency of 112 kHz?

23. Based on the description and the results of Study 2, which of the following expressions shows how to calculate the number of times a female R. mehelyi did NOT land in one of the compartments?

24. In Study 1, which of the following procedures was likely performed to ensure that a given peak frequency measurement was not influenced by the Doppler effect?

25. For humans, the audible range of sound is 20−20,000 Hertz (Hz). Based on Figure 1, would a human likely be able to hear a call emitted at a peak frequency from a 24 g R. mehelyi?

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