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ACT Science Medium practice

13 questions

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Medium practice

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Question 1

Based on Experiment 1, why was it important that all pots received the same volume of water?

A.To increase seedling growth in all pots.B.To reduce variation due to pH.C.To prevent water availability from confounding the effect of pH on height.D.To shorten the experiment.

Question 2

Compare the results of Experiment 1 (enzyme rate vs. temperature) and Experiment 2 (extension vs. mass). Which statement best characterizes the difference?

A.Both experiments show a strictly linear increase in the dependent variable.B.Experiment 2 shows a linear relationship; Experiment 1 shows a non-monotonic relationship.C.Both experiments show a non-monotonic relationship.D.Experiment 1 is linear; Experiment 2 is non-monotonic.

Question 3

Based on Set 2, what would both researchers likely AGREE on?

A.Car batteries appear to perform worse in cold weather.B.Cold weather permanently damages batteries.C.Engine load is irrelevant to battery performance.D.Chemistry is the only relevant factor.

Question 4

Based on Set 1, both scientists could agree on which of the following?

A.Native fish populations in Lake Marisol have declined.B.Rising temperatures are the primary driver of decline.C.The invasive species is the primary driver of decline.D.The nearby unaffected lake also has rising temperatures.

Question 5

Experiment 3. An ecology team measured water salinity at five distances from where a river enters a coastal bay. Wind and tide were calm during the readings.

Distance from river mouth (km)	Salinity (parts per thousand, ppt)
0	0.5
5	5.2
10	12.8
15	22.4
20	30.1
25	34.5

According to the data in Experiment 3, salinity increases by the greatest amount over which $5 -km$ interval?

0

5

kmB.

5

10

kmC.

10

15

kmD.

20

25

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Question 6

Experiment 3. A clinical team compared two methods for measuring blood glucose: a finger-stick monitor (Method A) and a continuous-glucose sensor patch (Method B). Both methods were used on the same $50$ volunteers, and each volunteer's measurement was repeated $3$ times by each method. Average readings (mg/dL) for each volunteer were compared.

Which of the following is the most important reason both methods were used on every volunteer?

A.To increase the total number of measurements.B.To control for individual differences between volunteers.C.To save time.D.To eliminate random error in measurement.

Question 7

Based on the data in Experiment 1, if the student had run an additional trial at $35° C$ , the reaction rate would most likely have been:

A.less than

5.1

μmol/minB.between

5.1

and

8.2

μmol/minC.exactly

5.1

μmol/minD.greater than

8.2

μmol/min

Question 8

Based on Experiment 2, what extension would the spring most likely show for a $750 g$ mass, assuming the same relationship holds?

7.5

cmB.

10.0

cmC.

15.0

cmD.

20.0

Question 9

Based on Experiment 3, why did the team take $3$ repeated measurements per volunteer with each method?

A.To average out random measurement noise.B.To increase the number of volunteers.C.Because each method gives a different answer.D.To test multiple time-of-day effects.

Question 10

Based on Experiment 2, why might it be problematic to claim that 'more rainfall causes wider rings' from this study alone?

A.Because rainfall and ring width show no correlation.B.Because the scientist did not control other variables like temperature.C.Because there were too many trees per year.D.Because she sampled across multiple years.

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Question 11

Based on Set 2, what observation would Researcher 2 expect that Researcher 1 would NOT necessarily expect?

A.Identical batteries deliver less peak current at

- 10° C

than at

25° C

even when not connected to an engine.B.Lighter-weight oil in the same engine reduces the magnitude of the cold-morning voltage decline.C.Battery voltage returns to normal once temperature rises.D.Voltage decline is proportional to temperature drop.

Question 12

Based on Set 1, what is the central observation Scientist 2 uses to argue AGAINST Scientist 1's temperature explanation?

A.Stomach contents of invasive fish contain juvenile natives.B.The native species are stable in a nearby lake with similar temperature trends but no invasive species.C.The native species spawn in a narrow temperature window.D.Native fish concentrate near cool water in summer.

Question 13

Based on the data in Experiment 1, what additional conclusion is best supported by comparing trials 4 and 5?

A.The enzyme works equally well at all temperatures.B.The reaction rate continues to increase past

40° C

.C.An optimal temperature for the enzyme lies between

30° C

and

50° C

.D.The enzyme is more active at

50° C

than at

40° C

ACT Science Medium practice — Free with Answer Explanations | Test Practice Hub