ACT Science Practice

What is the benchmark for Science?

• 22
• 23
• 24
• 21

What does it mean to be “college ready” according to ACT?

• scores of 24 or higher on all subtests
• having a high school GPA of 3.0 or better
• able to gain acceptance to a four-year university
• capable of earning C or better in first-year college courses

Which of the following graphs best illustrates the relationship between the heat released by the foods listed in Table 1 and the change in water temperature?

• A
• B
• C
• D

Tags

CCSS.8.EE.B.5

If, in Experiment 2, a 1.5 × 10–6 F capacitor had been used, the time required for the voltage across the capacitor to reach 6 V would have been closest to:

• 4.2 sec
• 7.0 sec
• 10.5 sec
• 15.0 sec

The main purpose of Experiment 3 was to determine how varying the:

• battery’s voltage affected the resistor’s resistance at a given time.
• capacitor’s capacitance affected the time required for the voltage across the capacitor to reach a set value.
• . capacitor’s capacitance affected the voltage across the battery at a given time.
• resistor’s resistance affected the time required for the voltage across the capacitor to reach a set value.

Consider a circuit like that shown in Figure 1. Based on Experiments 2 and 3, the voltage across the capacitor will reach a given value in the shortest amount of time if the circuit contains which of the following capacitances and resistances, respectively

• 0.1 × 10–6 F, 0.3 × 107 Ω
• 0.1 × 10–6 F, 1.0 × 107 Ω
• 1.2 × 10–6 F, 0.3 × 107 Ω
• 1.2 × 10–6 F, 1.0 × 107 Ω

Consider the following hypothesis: In a circuit arranged as in Figure 1 containing a battery, a capacitor, and a constant resistance, as capacitance increases, the time required to reach a given voltage across the capacitor increases. Do the experiments support this hypothesis?

• Yes; in Experiment 1, as capacitance increased, the time required to reach a given voltage increased.
• Yes; in Experiment 2, as capacitance increased, the time required to reach a given voltage increased.
• . No; in Experiment 1, as capacitance increased, the time required to reach a given voltage decreased.
• . No; in Experiment 2, as capacitance increased, the time required to reach a given voltage decreased.

A student wants to test the effects of type of exercise on heart rate.  What is the independent variable?

• type of exercise
• heart rate
• amount of time exercise occurs
• gender of person that exercises

A student wants to test the effects of type of exercise on heart rate.  What would be a proper hypothesis?

• If type of exercise affects the heart rate of a person, then jumping jacks will increase the heart rate the most
• Jumping jacks will cause the highest heart rate
• Exercise increases heart rate
• If exercise affects heart rate, jumping jacks will increase heart rate the most

A student wants to test the effects of type of exercise on heart rate.  What would be a good experimental group?

• jumping jacks, push-ups, sit-ups, jogging in place, lunges
• standing heart rate