ACT - Science Reasoning - 查题吧

不定项选择题

Based on the experimental data, which of the following conclusions is the most reasonable one？

A. Industrial sulfate affects pH levels to a greater extent than naturally occurring sulfate.
B. Sufficiently warm water temperatures are needed in order for sulfate to affect the pH levels in lake water.
C. In lake water, pH levels are sensitive to sulfate concentration levels.
D. In lake water, sulfate concentration levels have little or no impact on pH levels.

单选题

Based on the chemical equation in the passage, in a ZAB, as 5 02 molecules are consumed, how many Zn atoms, if any, must also be consumed？

A. 0
B. 2
C. 5
D. 10

单选题

Scientist 1’s viewpoint indicates that when the mate-rials that compose most of a comet are sufficientlyheated, they change to:

A. solids.
B. gases.
C. liquids.
D. a vacuum.

单选题

In Study 4, the researchers trapped birds for 10,000 hr per year. Thus, how many insectivores were trapped inYear 2 ？

A. 80
B. 100
C. 800
D. 1,000

单选题

According to Study 1, the reflectance of white S at a wavelength of 0.40 μm is closest to

A. 0.0
B. 0.1
C. 0.2
D. 0.3

单选题

Based on the results of Study 2, would a finch with a beak depth of 9.4 mm or a finch with

A finch with a beak depth of 9.4 mm, because, on average, the size of available seeds is larger during dry years.
B. A finch with a beak depth of 9.4 mm, because, on average, the size of available seeds is smaller during dry years.
C. A finch with a beak depth of 9.9 mm, because, on average, the size of available seeds is larger during dry years.
D. A finch with a beak depth of 9.9 mm, because, on average, the size of available seeds is smaller during dry years.

单选题

In the chemical equation shown in the passage, the carbon in CO2 becomes part of which of

A. Fat
B. Sugar
C. Protein
D. Nucleic acid

单选题

In Experiment 1, if 2.30 mL of titrant had been added to the sample solution, the conductivity would most likely have been:

A. less than 0.80 kS/cm.
B. between 0.80 kS/cm and 2.30 kS/cm.
C. between 2.30 kS/cm and 3.80 kS/cm.
D. greater than 3.80 kS/cm.

单选题

Passage V<br>An astronomy class is given the following facts about stellar evolution.<br>1. A star’s evolution can be divided into 3 stages: premain sequence (pre-MS), main sequence (MS), and post-main sequence (post-MS).<br>2. Gravity causes part of a cloud of gas and dust to collapse and heat up, creating a pre-MS star. The star’s hot dust and gas emit its energy.<br>3. A pre-MS star becomes an MS star when the star produces the majority of its energy by fusing hydrogen nuclei (protons) at its center to make helium nuclei.<br>4. An MS star becomes a post-MS star when the star expands in volume and produces the majority of its energy by fusing hydrogen to make helium in a shell surrounding its center.<br>5. The more massive a star, the more rapidly the star passes through each of the 3 stages of its evolution.Two students discuss the evolution of the Algol system—Algol A, a 3.6-solar-mass MS star; Algol B, a 0.8-solar-mass post-MS star; and Algol C, a 1.7-solar-mass MS star. (One solar mass = the Sun’s mass.) The 3 stars orbit a mutual center of mass, with Algol A and Algol B much closer to each other and to the center of mass than to Algol C.<br>Student 1<br>The 3 stars of the Algol system formed at the same time from the same cloud of gas and dust. Algol B, originally the most massive of the 3 stars, became a post-MS star and expanded in volume while Algol A remained an MS star. Because the matter in the outer parts of Algol B was more strongly attracted to Algol A than to the matter in the inner parts of Algol B, this matter flowed from Algol B to Algol A, and, over time, Algol A became more massive than Algol B.<br>Student 2<br>Algol B was not part of the original Algol system (Algol A and Algol C). Algol B and the original Algol system formed in different clouds of gas and dust at different times and moved in 2 different but intersecting orbits around the center of the galaxy. During a particular orbit,Algol B encountered the original Algol system at the intersection of the 2 orbits and became part of the Algol system.Algol B became a post-MS star while Algol A and Algol C remained MS stars. Algol B never lost mass to Algol A. Algol B was always less massive than Algol A.<br>Based on Student 2’s discussion, Algol B is part of the present Algol system because of which of the following forces exerted on Algol B by the original Algol system？

A. Electric force
B. Magnetic force
C. Gravitational force
D. Nuclear force

单选题

Suppose that the transfer of genes between 2 bacteriawas interrupted, that the last gene transferred wasGene A, and that no incomplete copies of a gene weretransferred. Based on this information, Student 1would say that transfer was most likely interruptedhow many minutes after the transfer began？

A. 15
B. 30
C. 45
D. 60

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