Math
English
Reading
Science
Mystery
100
Simplify 120/6000
1/50
100
Weighing more than 15,000 tons each, workers used massive tunnel boring machines to dig the tunnel. Each one could cut through the earth at a rate of approximately 15 feet per hour. These machines also collected the spoil, or earth removed by the machines, and sent it out of the tunnel via a long conveyer belt. A concrete lining was also added to the tunnel to prevent it from collapsing. To ensure that the French and British teams would eventually meet in the middle, the tunnel boring machines were steered using lasers.
Choose the answer that best corrects the underlined portion of the passage. If the underlined portion is correct as written, choose "NO CHANGE."
A. NO CHANGE
B. Which weighed more than 15,000 tons each, workers dug the tunnel using massive tunnel boring machines.
C. More than 15,000 tons each, workers used massive tunnel boring machines to dig the tunnel.
D. Weighing more than 15,000 tons each, workers dug the tunnel using massive tunnel boring machines.
E. Weighing more than 15,000 tons each, massive tunnel boring machines were used to
E. Weighing more than 15,000 tons each, massive tunnel boring machines were used to
100
"Did you do all of the housework," she asked?
Which of the following is the best correction for this sentence?
A. None of the corrections listed here are correct.
B. The sentence contains no errors.
C. "Did you do all of the housework," she asked.
D. "Did you do all of the housework?" she asked.
E. "Did you do all of the housework?," she asked.
D. "Did you do all of the housework?" she asked.
100
The significant increase in atmospheric carbon dioxide since pre-industrial levels can be seen in the world’s oceans which absorb the CO2 and in turn undergo changes in chemistry. The consequences of increased CO2 include acidification of seawater and a decrease in carbonate ion (CO32-) concentration.
Changes in seawater chemistry affect marine organisms. The early life stages of invertebrates, such as squid, may be particularly vulnerable to changes in carbon dioxide levels. Acting as both predator and prey, squid are a significant component of marine ecosystems. For example, fish and sea birds, such as tuna and albatross, are dependent on squid as a source of prey. Furthermore, the fishing industry is impacted by the health of squid populations. California fisheries produce the majority of market squid.
In order to determine how increased levels of carbon dioxide affect the development of squid, eggs were hatched in two different conditions: normal (380 µatm) and elevated (2100 µatm) levels of CO2. The time to hatch and the size of the larval mantle (the anatomical feature that includes the body wall and fins) were measured and recorded. Two trials were conducted for each carbon dioxide concentration.
Which of the following can be concluded from the passage?
A. Carbonate ion concentration correlates with ocean temperatures
B. Atmospheric CO2 levels correlate with the concentration of CO2 in the oceans
C. Carbon dioxide concentration correlates with ocean temperatures
D. Tuna and albatross populations are directly related
B. Atmospheric CO2 levels correlate with the concentration of CO2 in the oceans
100
minutes for ACT English
45
200
if x^2+x-6+0, what does x equal?
x=2,-3
200
With over 165 wins in 11 seasons, the coaching prowess of Mike Ditka made the Chicago Bears a perpetual threat in the NFL.
A. Mike Ditka made the Chicago Bears a perpetual threat in the NFL with his coaching prowess.
B. the perpetual threat to the NFL from the Chicago Bears was coach Mike Ditka's prowess.
C. the NFL was perpetually threatened by Chicago Bears coach Mike Ditka's prowess.
D. the prowess of coach Mike Ditka made the Chicago Bears a perpetual NFL threat.
E. Mike Ditka's coaching prowess made the Chicago Bears a perpetual threat in the NFL.
A. Mike Ditka made the Chicago Bears a perpetual threat in the NFL with his coaching prowess.
200
The world is full of contradictions and I am full of them as well. Every person has their quirks and I am no exception. I love sports but I am also lazy I love animals, but I am not a vegetarian and I love teaching but I hate taking classes. With all these contradictions how does a person like me make sense? I would love to enlighten you!
How should the author punctuate the underlined portion to make it a proper sentence?
A. I love sports, but I am also lazy, I love animals, but I am not a vegetarian, and I love teaching, but I hate taking classes.
B. NO CHANGE
C. DELETE the underlined portion
D. I love sports, but I am also lazy; I love animals, but I am not a vegetarian; and I love teaching, but I hate taking classes.
E. I love sports, I am also lazy, and I love teaching.
D. I love sports, but I am also lazy; I love animals, but I am not a vegetarian; and I love teaching, but I hate taking classes.
200
Since the early 1900s, there has been a steady increase in the earth’s atmospheric temperature, resulting in a phenomenon called “Global Warming.” While the steady temperature change has been well documented, the cause of global warming remains controversial.
Scientist 1
Scientist 1 believes that “external forcings” are the cause of increased temperature over the past century. “External forcings” can direct the change in temperature over thousands of years. One example of an external force is variation in the earth’s orbit around the sun. The earth orbital cycle lasts 26,000 years and causes general trends in warming and cooling.
Scientist 2
Scientist 2 believes that global warming is a man-made phenomenon due to an increase in greenhouse gases such as carbon dioxide or methane. Greenhouse gases have a natural warming effect, however, an increase in the amount of atmospheric greenhouse gases many enhance that effect. Since 1750, the concentration of carbon dioxide has increased 36 percent while the amount of atmospheric methane has increased 148 percent.
Summarize the differences between the scientists' theories.
A. Scientist 1 does not believe there has been a significant change in global temperatures while scientist 2 does.
B. Scientist 1 believes a global cooling cycle will occur soon while Scientist 2 does not.
C. Scientist 1 thinks global warming is a naturally occurring phenomenon while Scientist 2 believes man is responsible.
D. Scientist 1 believes there is no harm in global warming while Scientist 2 believes global warming will be catastrophic.
C. Scientist 1 thinks global warming is a naturally occurring phenomenon while Scientist 2 believes man is responsible.
200
minutes for ACT math
60
300
What is equivalent to (x)(x)(x)(x)(x^-2)
x^2
300
dapted from “Emerson’s Prose Works” in The Works of Orestes A. Brownson: Philosophy of Religion by Orestes Brownson (ed. 1883)
Mr. Emersons literary reputation is established and placed beyond the reach of criticism. No living writer surpasses him in his mastery of pure and classic English; nor do any equal him—neither in the exquisite delicacy and finish of his chiseled sentences, or in the metallic ring of his style. It is only as a thinker and teacher that we can venture any inquiry into his merits; and as such we cannot suffer ourselves to be imposed upon by his oracular manner, nor by the apparent originality either of his views or his expressions.
Mr. Emerson has had a swarm both of admirers but also of detractors. With many, he is a philosopher and sage, almost a god; while with others, he is regarded as an unintelligible mystic, babbling nonsense fitted to captivate beardless young men and silly maidens with pretty curls, all of who constituted years ago the great body of his hearers and worshipers. We rank us in neither class, though we regard he as no ordinary man. Indeed, we believe he to be one of the deepest thinkers as well as one of the first poets of our country. Indeed, by long acquaintance have him and us been in mutual contact—if only from a distance at times. We know him to be a polished gentleman, a genial companion, and a warmhearted friend, whose' kindness does not pass over individuals and waste itself in a vague philanthropy. So much, at least, we can say of the man, and this do we base not only upon former personal acquaintance and upon our former study of his writings.
What is the best form of the underlined selection, "acquaintance and upon our former study of his writings"?
A. NO CHANGE
B. acquaintance and also upon our former study of his writings
C. acquaintance but upon our former study of his writings
D. acquaintance but also upon our former study of his writings
D. acquaintance but also upon our former study of his writings
300
The following is an excerpt from The Monk by Matthew Gregory Lewis (1794)
"Were it possible" said the Friar, "for man to be so totally wrapped up in himself as to live in absolute seclusion from human nature, and could yet feel the contented tranquillity which these lines express, I allow that the situation would be more desirable, than to live in a world so pregnant with every vice and every folly; but this never can be the case. This inscription was merely placed here for the ornament of the grotto, and the sentiments and the hermit are equally imaginary. Man was born for society. However little He may be attached to the world, he never can wholly forget it, or bear to be wholly forgotten by it. Disgusted at the guilt or absurdity of mankind, the misanthrope flies from it: he resolves to become an hermit, and buries himself in the cavern of some gloomy rock. While hate inflames his bosom, possibly he may feel contented with his situation: but when his passions begin to cool; when time has mellowed his sorrows, and healed those wounds which he bore with him to his solitude, think you that content becomes his companion? Ah! no, Rosario. No longer sustained by the violence of his passions, he feels all the monotony of his way of living, and his heart becomes the prey of ennui and weariness. He looks round, and finds himself alone in the universe: the love of society revives in his bosom, and he pants to return to that world which he has abandoned. Nature loses all her charms in his eyes: no one is near him to point out her beauties, or share in his admiration of her excellence and variety. Propped upon the fragment of some rock, he gazes upon the tumbling waterfall with a vacant eye; he views without emotion the glory of the setting sun."
Given the information from this passage, which of the following might come next?
A. An objection from Rosario
B. A story about Rosario’s wife
C. A description of Rosario’s hometown
D. None of the other answers
E. A tale of Rosario’s relationship with the Friar
A. An objection from Rosario
300
Sound waves travel through a medium by mechanically disturbing the particles of that medium. As particles in the medium are displaced by the sound wave, they in turn act upon neighboring particles. In this fashion, the wave travels through the medium through a parallel series of disturbed particles. Like in other forms of motion, the rate at which the sound wave travels can be measured by dividing the distance over which the wave travels by the time required for it to do so.
Study 1
A group of students hypothesizes that the velocity of sound is dependent upon the density of the medium through which it passes. They propose that with more matter in a given space, each particle needs to travel a shorter distance to disturb the adjacent particles. Using two microphones and a high speed recording device, the students measured the delay from the first microphone to the second. They chose a variety of media, shown in Table 1, and measured the velocity of sound through each using their two-microphone setup. The results are found in Table 1.
Study 2
The students wanted to test their hypothesis by using the same medium at different densities. To do this, they heated pure water to various temperatures and repeated the procedure described in Study 1. Their results can be found in Table 2.
If the students' hypotheses were correct, what might be a worthwhile question for them to study next?
A. Does the length of the sample used affect the velocity of sound through a substance?
B. Does density affect the velocity of sound in substances other than those tested in Study 1?
C. What is the velocity of sound in water over 100°C?
D. What other properties of matter affect velocity of sound through a substance?
D. What other properties of matter affect velocity of sound through a substance?
300
minutes for ACT reading
35
400
Simplify sin^2xcscxcotx
cosx
400
This feeling that books are real friends is constantly present to all who love reading. “I have friends,” said Petrarch, “whose society is extremely agreeable to me; they are of all ages, and of every country. They have distinguished themselves both in the cabinet and in the field, and obtained high honors for their knowledge of the sciences. It is easy to gain access to them, for they are always at my service, and I admit them to my company, and dismiss them from it, whenever I please. They are never troublesome, but immediately answer every question I ask them. Some relate to me the events of past ages, while others reveal to me the secrets of Nature. Some teach me how to live, and others how to die.
Some relate to me the events of past ages, while others reveal to me the secrets of Nature.
A. NO CHANGE
B. past age's; while
C. past ages, since
D. past age's, while
A. NO CHANGE
400
This is an excerpt from A Narrative of the Life and Adventures of Venture, a Native of Africa, but Resident above Sixty Years in the United States of America, Related by Himself by Venture Smith (1798)
But Captain Hart was a white gentleman, and I a poor African, and therefore it was all right, and good enough for the black dog. I am now sixty nine years old. Though once straight and tall, measuring without shoes six feet one inch and an half, and every way well proportioned, I am now bowed down with age and hardship. My strength which was once equal if not superior to any man whom I have ever seen, is now enfeebled so that life is a burden, and it is with fatigue that I can walk a couple of miles, stooping over my staff. Other griefs are still behind; on account of which some aged people, at least, will pity me. My eyesight has gradually failed, till I am almost blind, and whenever I go abroad one of my grandchildren must direct my way; besides for many years I have been much pained and troubled with an ulcer on one of my legs. But amidst all my griefs and pains, I have many consolations; Meg, the wife of my youth, whom I married for love, and bought with my money, is still alive. My freedom is a privilege which nothing else can equal. Notwithstanding all the losses I have suffered by fire, by the injustice of knaves, by the cruelty and oppression of false-hearted friends, and the perfidy of my own countrymen whom I have assisted and redeemed from bondage, I am no possessed of more than two hundred acres of land, and three habitable dwelling houses. I gives me joy to think that I have and that I deserve so good a character, especially for truth and integrity.
The speaker is most likely which of the following?
A. A former slave
B. A wealthy man
C. A banker
D. A plantation owner
E. None of the other answers
A. A former slave
400
The rate of a reversible chemical reaction depends on many factors, including concentrations of the reactants and products, temperature, and presence of enzymes called catalysts. In the forward reaction, two reactants combine to form one product. However, in a reverse reaction, the product is broken down into the two reactants.
In order for a forward reaction to occur, the reactants moving around in the test tube must physically interact with each other. The more often reactants interact with each other, the more produce is formed in the same amount of time. The speed at which reactants combine into products (the rate of the reaction) can be calculated by dividing the amount of a chemical produced in a reaction (often measured in moles) by the time it takes to produce that amount.
In order to determine the effects of reactant and product concentration, temperature, and presence of catalysts on the rate of a reaction, a scientist studied the following reaction:
H++Cl−⇌HCl
The scientist varied the conditions of the experiment and measured the rate of the reaction. The results are outlined in Table 1. The units of concentration are moles per liter.
In a further experiment, intead of using 5 or 10 moles for the amount of acid covertase, the scientist uses 20 moles. What is the expected rate of reaction?
A. 160 moles/L/s
B. 80 moles/L/s
C. 40 moles/L/s
D. 120 moles/L/s
A. 160 moles/L/s
400
minutes for ACT science
35
500
J, 125
500
It was about halfway through his last set of conferences that Mr. Man realizes (1) he did not (2) much like his current set of students. Unlike his students in the past, none of them seemed to care about their (3) grades, (4) none of them was able to tell a dangling modifier from a participle, (4) and, apart from a few, (4) they didn't know (5) how to start a paper. He would never tell any of them this, of course, (6) they might get offended, and if there was one thing that Mr. Man learned (7) about teaching, its (8) that in order to keep one's job, you couldn't offend your students (9). As yet another student whined about not understanding Mr. Mans (10) perfectly clearly written assignments, he sighed inwardly (and possibly outwardly as well), (11) and waited for the last (12) one to finish so that he could get to the next one, finish his conferences, and get back to daydreaming about being anything but a teacher.
Choose from the following four options the answer that best corrects the underlined mistake preceding the question number. If there is no mistake or the original text is the best option, choose "NO CHANGE."
A. NO CHANGE
B. his
C. his or her
D. they're
C. his or her
500
Adapted from The Effects of Cross & Self-Fertilisation in the Vegetable Kingdom by Charles Darwin (1876)
As it is impossible to exclude such minute pollen-carrying insects as Thrips, flowers which it was intended to fertilise with their own pollen may sometimes have been afterwards crossed with pollen brought by these insects from another flower on the same plant; but as we shall hereafter see, a cross of this kind does not produce any effect, or at most only a slight one. When two or more plants were placed near one another under the same net, as was often done, there is some real though not great danger of the flowers which were believed to be self-fertilised being afterwards crossed with pollen brought by Thrips from a distinct plant. I have said that the danger is not great because I have often found that plants which are self-sterile, unless aided by insects, remained sterile when several plants of the same species were placed under the same net. If, however, the flowers which had been presumably self-fertilised by me were in any case afterwards crossed by Thrips with pollen brought from a distinct plant, crossed seedlings would have been included amongst the self-fertilised; but it should be especially observed that this occurrence would tend to diminish and not to increase any superiority in average height, fertility, etc., of the crossed over the self-fertilised plants.
As the flowers which were crossed were never castrated, it is probable or even almost certain that I sometimes failed to cross-fertilise them effectually, and that they were afterwards spontaneously self-fertilised. This would have been most likely to occur with dichogamous species, for without much care it is not easy to perceive whether their stigmas are ready to be fertilised when the anthers open. But in all cases, as the flowers were protected from wind, rain, and the access of insects, any pollen placed by me on the stigmatic surface whilst it was immature, would generally have remained there until the stigma was mature; and the flowers would then have been crossed as was intended. Nevertheless, it is highly probable that self-fertilised seedlings have sometimes by this means got included amongst the crossed seedlings. The effect would be, as in the former case, not to exaggerate but to diminish any average superiority of the crossed over the self-fertilised plants.
Errors arising from the two causes just named, and from others,—such as some of the seeds not having been thoroughly ripened, though care was taken to avoid this error—the sickness or unperceived injury of any of the plants,—will have been to a large extent eliminated, in those cases in which many crossed and self-fertilised plants were measured and an average struck. Some of these causes of error will also have been eliminated by the seeds having been allowed to germinate on bare damp sand, and being planted in pairs; for it is not likely that ill-matured and well-matured, or diseased and healthy seeds, would germinate at exactly the same time. The same result will have been gained in the several cases in which only a few of the tallest, finest, and healthiest plants on each side of the pots were measured.
Kolreuter and Gartner have proved that with some plants several, even as many as from fifty to sixty, pollen-grains are necessary for the fertilisation of all the ovules in the ovarium. Naudin also found in the case of Mirabilis that if only one or two of its very large pollen-grains were placed on the stigma, the plants raised from such seeds were dwarfed. I was therefore careful to give an amply sufficient supply of pollen, and generally covered the stigma with it; but I did not take any special pains to place exactly the same amount on the stigmas of the self-fertilised and crossed flowers. After having acted in this manner during two seasons, I remembered that Gartner thought, though without any direct evidence, that an excess of pollen was perhaps injurious. It was therefore necessary to ascertain whether the fertility of the flowers was affected by applying a rather small and an extremely large quantity of pollen to the stigma. Accordingly a very small mass of pollen-grains was placed on one side of the large stigma in sixty-four flowers of Ipomoea purpurea, and a great mass of pollen over the whole surface of the stigma in sixty-four other flowers. In order to vary the experiment, half the flowers of both lots were on plants produced from self-fertilised seeds, and the other half on plants from crossed seeds. The sixty-four flowers with an excess of pollen yielded sixty-one capsules; and excluding four capsules, each of which contained only a single poor seed, the remainder contained on an average 5.07 seeds per capsule. The sixty-four flowers with only a little pollen placed on one side of the stigma yielded sixty-three capsules, and excluding one from the same cause as before, the remainder contained on an average 5.129 seeds. So that the flowers fertilised with little pollen yielded rather more capsules and seeds than did those fertilised with an excess; but the difference is too slight to be of any significance. On the other hand, the seeds produced by the flowers with an excess of pollen were a little heavier of the two; for 170 of them weighed 79.67 grains, whilst 170 seeds from the flowers with very little pollen weighed 79.20 grains. Both lots of seeds having been placed on damp sand presented no difference in their rate of germination. We may therefore conclude that my experiments were not affected by any slight difference in the amount of pollen used; a sufficiency having been employed in all cases.
What is the main idea of the passage?
A. An argument over the best ways to germinate different plants.
B. An evaluation of the confounding factors of the experiment.
C. A description of the methods used to artificially pollinate different plants.
D. An assessment of the effect of Thrips on fertilisation of plants.
E. A discussion of the different ways in which flowers can be pollinated.
B. An evaluation of the confounding factors of the experiment.
500
Sleep plays a vital role in defining the daily activities of virtually all animals. During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin. Yet, despite its ubiquity in the animal kingdom, the purpose of sleep and its role in our daily lives has been disputed by scientists. Two scientists discuss their theories about the purpose of sleep.
Scientist 1
During periods of sleep, animals are able to conserve energy that they would otherwise be spending on unnecessary activity. If an animal’s primary food source is most abundant during daylight, it is a waste of precious energy to be moving about at night. For example, many herbivores, such as squirrels, are diurnal (sleep during the night) because their food source is available during the day, while many insectivores, such as bats, are nocturnal (sleep during the day) because their food source is available during the night. Food sources, as an animal’s most valuable resource, dictate their sleep cycles. Many animal traits observable today evolved as a result of the supply and demand of food in their natural habitat.
Scientist 2
During waking hours, it is true that the body utilizes large amounts of energy. However, the role of sleep is to restore biological products that were utilized during periods of wakefulness, rather than simply avoid utilizing energy in the first place. Many types of biological molecules, such as hormones, are released throughout the body while an animal is active. Sleep serves as a period of inactivity during which the body can manufacture and store a supply of these molecules for future use during the next period of activity. Furthermore, sleep allows the body to repair cellular damages that has accumulated during waking hours. Experimental evidence shows that when animals are deprived of sleep, their immune system quickly weakens and death rates increase. Sleep is necessary for animals to prevent accumulation of damage and to regenerate crucial biomolecules for daily life.
Both scientists give evidence to support their theories. The evidence given by Scientist 1 can best be described as __________.
A. experimental
B. natural
C. empirical
D. observational
E. quantitative
D. observational
500
score Mr. Ridley wants me to make
21