Questions d'entraînement ACT
Les questions du test restent en anglais.
Voici un échantillon ACT gratuit de 15 questions à faire directement ici, avec les quatre domaines mélangés à peu près dans les proportions du test : English, Math, Reading et Science. Il combine questions à choix multiple, questions à réponses multiples et textes à trous, et chaque question a son explication. Réponds aux 15, puis regarde ton score et lis pourquoi chaque réponse fonctionne.
Which version of the sentence is punctuated correctly?
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Les 15 questions en un coup d'œil
Tu préfères lire avant de jouer ? Toutes les questions de l'échantillon sont listées ci-dessous. Les réponses et les explications restent repliées tant que tu ne les ouvres pas.
1. Which version of the sentence is punctuated correctly?
- A. The storm knocked out power for two days, we cooked everything on a camp stove.
- B. The storm knocked out power for two days; we cooked everything on a camp stove.
- C. The storm knocked out power for two days we cooked everything on a camp stove.
- D. The storm knocked out power for two days, and, we cooked everything on a camp stove.
Voir la réponse et l'explication
Réponse : B. The storm knocked out power for two days; we cooked everything on a camp stove.
Both halves of this sentence can stand alone, so joining them with only a comma creates a comma splice. Two independent clauses need a semicolon, a period, or a comma followed by a joining word such as and or so.
2. Complete the sentence.
The box of old photographs that my grandparents kept in the attic _____ finally been opened.
Options pour le trou 1 : have, has, having, were
Voir la réponse et l'explication
Réponse : has
The subject is box, which is singular, so the verb is has. The ACT often buries the subject by putting a prepositional phrase and a relative clause between it and the verb, so find the subject before you decide on the verb form.
3. A paragraph reads: In its first year, the school's bike repair club fixed 140 bicycles for students who would otherwise have paid a shop. The writer wants to end the paragraph with a sentence that supports its point about saving students money. Which choice does that best?
- A. A basic tune-up at a local shop starts at about forty dollars, so the club kept thousands of dollars in students' pockets.
- B. The club meets on Tuesdays in the shop room behind the gym.
- C. Bicycles have been a common way to get around the city for decades.
- D. Two members of the club later joined the track team.
Voir la réponse et l'explication
Réponse : A. A basic tune-up at a local shop starts at about forty dollars, so the club kept thousands of dollars in students' pockets.
Rhetorical skills questions are decided by the purpose stated in the question, not by which sentence sounds nicest. Only the first choice puts a number on the money saved, while the others are true sounding details that never touch cost.
4. Which of these sentences use an apostrophe correctly?
Coche toutes les bonnes réponses.
- A. The team celebrated its first win in three years.
- B. It's been a long season for the coaching staff.
- C. Both players' jerseys were retired on the same night.
- D. The bus left without it's driver.
- E. The Wilsons' invited us to dinner.
Voir la réponse et l'explication
Réponse : A. The team celebrated its first win in three years., B. It's been a long season for the coaching staff., C. Both players' jerseys were retired on the same night.
Its is the possessive form and takes no apostrophe, while it's is only ever a contraction of it is or it has. A plural that already ends in s takes the apostrophe after the s, as in players' jerseys, and a plain plural family name like the Wilsons takes no apostrophe at all.
5. A jacket is marked down 30 percent, and the sale price is $84. What was the original price?
- A. $109.20
- B. $114.00
- C. $120.00
- D. $126.00
Voir la réponse et l'explication
Réponse : C. $120.00
A 30 percent discount leaves 70 percent of the original price, so solve 0.7x = 84 and get x = 120. Adding 30 percent back onto the sale price gives $109.20, which is the trap answer, because the percent was taken from the larger number.
6. What is the slope of the line that passes through the points (-2, 5) and (4, -7)?
- A. -2
- B. -1/2
- C. 1/2
- D. 2
Voir la réponse et l'explication
Réponse : A. -2
Slope is the change in y over the change in x, so (-7 - 5) divided by (4 - (-2)) gives -12 over 6, which is -2. Watch the signs in the denominator, since subtracting a negative x value is the most common place this goes wrong.
7. Complete the sentence.
In a right triangle, the leg opposite angle A measures 5 and the hypotenuse measures 13, so sin A equals _____.
Options pour le trou 1 : 5/12, 5/13, 12/13, 13/5
Voir la réponse et l'explication
Réponse : 5/13
Sine is the opposite side over the hypotenuse, which is 5 over 13. The third side is 12 by the Pythagorean theorem, so 12/13 is cos A and 5/12 is tan A, and those are the choices that catch people who mix up the three ratios.
8. Which of the following values are solutions to the equation x squared minus x minus 6 equals 0?
Coche toutes les bonnes réponses.
- A. -3
- B. -2
- C. 0
- D. 2
- E. 3
Voir la réponse et l'explication
Réponse : B. -2, E. 3
The expression factors into (x - 3)(x + 2), so the solutions are 3 and -2. Checking beats trusting the factoring: 9 minus 3 minus 6 is 0, and 4 plus 2 minus 6 is 0, while -3 gives 9 plus 3 minus 6, which is 6.
9. Read the passage. When the Millbrook library ran out of shelf space, the head librarian did something odd with the empty basement room: she filled it with hammers, drills and a tile saw. Patrons could borrow a tool for a week the same way they borrowed a novel. Within two years the tool collection was checked out more often than the fiction shelves. Some staff were skeptical, and the repair bills were real, but the librarian argued that a library lends access, and access does not have to come in the shape of a book. The main idea of the passage is that:
- A. the Millbrook library had run out of shelf space.
- B. libraries should spend less money on fiction.
- C. one library widened what lending can mean, drawing doubts from staff but clear demand from patrons.
- D. most people find tools more useful than novels.
Voir la réponse et l'explication
Réponse : C. one library widened what lending can mean, drawing doubts from staff but clear demand from patrons.
A main idea has to cover the whole passage, not one sentence of it. The shelf space problem is only the setup, and the last two choices are broad claims about libraries and readers in general that this passage never makes.
10. Passage A: Rewilding a river means taking out what we built and stepping back. When the Corbin Dam came down, the channel rearranged itself in a single spring flood, and the fish returned without anyone stocking them. Nature keeps a blueprint we cannot draw. Passage B: Taking out a dam is not stepping back, it is one more decision. Someone picks which structure goes, which floodplain gets bought, and who pays for it. Rivers do recover, but calling that recovery natural hides the engineering and the money behind it. Both authors would most likely agree that:
- A. a river can recover ecologically after a dam is removed.
- B. people should stop managing rivers.
- C. dam removal costs too much to be worth doing.
- D. fish populations return only when they are restocked.
Voir la réponse et l'explication
Réponse : A. a river can recover ecologically after a dam is removed.
Paired passage questions ask you to find the narrow patch of common ground, not the argument. Passage A says the fish came back on their own and passage B says rivers do recover, so the two disagree about what to call the recovery rather than about whether it happens.
11. Complete the sentence.
Marisol read the committee's letter twice, set it down, and spent the rest of the afternoon rearranging books that were already in order. The narrator most likely wants readers to understand that Marisol is _____ the news in the letter.
Options pour le trou 1 : indifferent to, unsettled by, delighted by, confused by the wording of
Voir la réponse et l'explication
Réponse : unsettled by
Inference questions ask what the details imply, and here the rereading plus the pointless busywork signal agitation the narrator never names outright. Indifference is ruled out by the second reading, and nothing in the scene suggests pleasure or trouble understanding the words.
12. A student dropped one tablet of compound Z into 200 mL of water and timed how long it took to dissolve completely, repeating the trial at four water temperatures. Trial 1: 10 degrees C, 96 seconds. Trial 2: 20 degrees C, 62 seconds. Trial 3: 30 degrees C, 41 seconds. Trial 4: 40 degrees C, 28 seconds. Based on these results, a tablet dropped into water at 25 degrees C would most likely take about how long to dissolve?
- A. 24 seconds
- B. 35 seconds
- C. 51 seconds
- D. 70 seconds
Voir la réponse et l'explication
Réponse : C. 51 seconds
25 degrees falls between trial 2 and trial 3, so the dissolving time falls between 62 and 41 seconds, and 51 seconds is the only choice in that range. Notice that you never needed to know what compound Z is, which is the point: the science section is a data reading test, and it often uses substances and setups you have never met.
13. A student wants to test whether adding salt changes how long water takes to freeze. Which of the following should be kept the same in every trial?
Coche toutes les bonnes réponses.
- A. The starting temperature of the water
- B. The volume of water in each container
- C. The freezer setting
- D. The amount of salt added
- E. The time each sample takes to freeze
Voir la réponse et l'explication
Réponse : A. The starting temperature of the water, B. The volume of water in each container, C. The freezer setting
Everything except the one variable you are testing has to be held constant, or you cannot tell what caused a difference. The amount of salt is the variable being changed on purpose, and the freezing time is the result being measured, so neither one can be controlled.
14. Two scientists explain why dissolved oxygen in a lake has fallen. Scientist 1 says fertilizer running off nearby fields feeds algae, and the algae die and decay, which uses up oxygen. Scientist 2 says the lake water has warmed, and warmer water holds less dissolved oxygen. Which finding, if confirmed, would most weaken Scientist 2's explanation?
- A. Lake water temperature rose by 3 degrees C over the same period.
- B. Oxygen fell just as sharply in a nearby lake whose temperature did not change.
- C. Algae counts in the lake rose over the same period.
- D. Cold water is able to hold more dissolved oxygen than warm water.
Voir la réponse et l'explication
Réponse : B. Oxygen fell just as sharply in a nearby lake whose temperature did not change.
A case where the effect appears without the proposed cause is the strongest evidence against that cause, so an unwarmed lake losing oxygen just as fast undermines the temperature explanation. Rising algae counts support Scientist 1 without weakening Scientist 2, because both processes could be draining oxygen at once.
15. Figure 1 plots the size of two bacterial cultures over 8 hours. Culture A rises in a straight line from 200 cells per mL at hour 0 to 1,000 cells per mL at hour 8. Culture B holds steady at 800 cells per mL through hour 4, then falls in a straight line to 400 cells per mL at hour 8. According to Figure 1, at about what time are the two cultures the same size?
- A. Hour 2
- B. Hour 4
- C. Hour 5
- D. Hour 7
Voir la réponse et l'explication
Réponse : C. Hour 5
Culture A gains 100 cells per mL each hour, so it sits at 700 at hour 5, and culture B loses 100 per hour after hour 4, so it is also at 700 at hour 5. When a question asks when two things are equal, look for where the lines cross rather than reading each line on its own.
Ce que contient vraiment l'ACT
L'ACT est un test à choix multiple construit sur quatre domaines : English, Math, Reading et Science. Chaque section que tu passes est notée sur une échelle de 1 à 36, et ton score composite est la moyenne de ces scores de section, arrondie. Il y a un essai optionnel, noté à part sur sa propre échelle, qui ne change pas le composite. Rien n'est retiré pour une mauvaise réponse, il n'y a donc jamais de raison de laisser une question vide.
Le format est en train de changer, et ça compte plus que d'habitude en ce moment. À partir de 2025, ACT a commencé à déployer une version plus courte du test : moins de questions, plus de temps par question, et Science en section optionnelle plutôt qu'obligatoire. Sur cette version, le composite vient d'English, Math et Reading, et un score de Science est donné à part si tu choisis de la passer. La version que tu passes peut dépendre de ta date de test et du fait que tu le passes en ligne ou sur papier, alors traite tout nombre de questions fixe que tu lis quelque part, y compris dans un vieux livre de préparation et y compris sur cette page, comme quelque chose à confirmer. Vérifie le format officiel de l'ACT pour ta propre date de test avant de bâtir un plan de rythme autour d'un chiffre.
Ce que demande chaque section a été plus stable que les décomptes. English teste l'usage et la mécanique, c'est-à-dire la ponctuation, la grammaire et la structure de la phrase, plus les compétences rhétoriques, c'est-à-dire l'organisation, le style, et le fait qu'une phrase ait sa place dans le paragraphe ou non. Math va de la pré-algèbre et de l'algèbre élémentaire à la géométrie analytique, la géométrie plane et un peu de trigonométrie. Reading s'appuie sur des textes : idée principale, détail à l'appui, inférence, vocabulaire en contexte, et questions qui comparent deux textes sur un même sujet. Science te met sous les yeux des tableaux, des graphiques et des explications concurrentes et te demande de les lire.
Comment utiliser cet échantillon
Ces 15 questions reprennent en miniature le mélange de contenu de l'ACT. English a la plus grosse part parce que c'est la section qui porte le plus de questions au vrai test, Math vient ensuite, et Reading et Science complètent. Le vrai ACT est à choix multiple du début à la fin. Cet échantillon utilise aussi des questions à réponses multiples et des textes à trous, parce que ces formats sont plus difficiles à deviner, ce qui en fait un meilleur contrôle de ta connaissance réelle de la règle.
Fais-le d'une traite, sans notes ni calculatrice. L'ACT récompense la vitesse plus que la plupart des examens, et sur le format long il te laissait nettement moins d'une minute par question sur plusieurs sections. Le format court a allégé ça sans le supprimer, donc s'entraîner à un rythme où tu t'engages sur une réponse et tu avances vaut autant que la révision du contenu.
Ensuite, lis l'explication de chaque question, y compris celles que tu as réussies. Une mauvaise réponse pointe en général vers une compétence plutôt que vers un fait. Si tu as raté la question sur la virgule mal employée et celle sur l'apostrophe, révise la ponctuation comme un seul thème au lieu d'apprendre deux phrases par cœur. Et surveille ce que tu as fait sur les questions de Science : si tu es allé chercher un souvenir vague de ton cours de biologie au lieu de lire les nombres sous tes yeux, cette habitude te coûtera des points sur le vrai test.
Comment StudyPDF crée des tests complets à partir de tes propres documents
Quinze questions peuvent te montrer quels domaines sont fragiles. Elles ne suffisent pas à te rendre prêt, et un jeu de questions générique n'a aucune idée des chapitres que ton cours a réellement couverts ni des erreurs que tu répètes.
StudyPDF part de ton matériel à la place. Importe ton livre de préparation à l'ACT, tes notes de cours ou un test d'entraînement que ton enseignant t'a rendu, et Bo, l'agent de révision, crée des tests d'entraînement complets à partir de ces pages précises. Chaque question est ancrée dans ce que tu as importé, et chaque explication renvoie à l'endroit d'où vient la réponse, tu peux donc vérifier la source quand quelque chose cloche. Tu peux générer un nouveau test aussi souvent que tu veux, le concentrer sur un seul domaine comme la trigonométrie ou les règles de la virgule, et voir quels thèmes tu rates sans arrêt.
Tu n'as pas besoin d'un document pour commencer. Tu peux aussi simplement nommer un thème, par exemple l'interprétation de données en Science à l'ACT ou l'accord du sujet et du verbe, et Bo écrit une série d'entraînement à partir de là. Commencer est gratuit.
Rédigé par l'équipe StudyPDF. Mis à jour le 2026-08-19.