The ACT Science test has 40 questions which must be completed in 35 minutes. It measures five skills that are needed in the natural sciences: evaluation, analysis, interpretation, reasoning, and problem solving. Try our ACT Science practice tests to prepare for this portion of your ACT test. These free science tests are multiple choice, and have questions that are very similar to those found on the actual test. Dedicating some time and effort to ACT Science practice is a great way to improve your score.