ACT Science free practice questions with answers
Read question 1 and its full worked answer from paper 1 of our 20-paper ACT Science set, then download the 4-page PDF. These are original practice questions, not official past papers. Page updated 3 November 2026.
According to Table 1, at which temperature did Enzyme P show its maximum activity?
A 50°C
B 40°C
C 30°C
D 60°C
Correct answer: B
- Scan the Enzyme P column in Table 1 for the highest value: 30 units/min occurs at 40°C, higher than at any other listed temperature.
When a question asks for a maximum or minimum, scan the entire column methodically rather than trusting your first impression — the highest value isn't always at the extreme ends of the table.
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Questions about this sample
What is in the ACT Science free sample?
The first 3 questions from paper 1 of the set, in the real exam layout, followed by the step-by-step worked answers. It is a 4-page PDF; this page shows question 1 with its answer.
How many full ACT Science papers are there?
20 original papers for students preparing for the ACT. Each is 40 questions in 40 minutes across 6 science passages, with a worked solution for every question. Papers start at A$11.99 and download instantly as a PDF.
Are these official past papers?
No. The sample is taken from our own original practice paper and is not an official past paper or affiliated with any exam authority.