PhySci Midterm Review

What is the first step of the scientific method?

• Forming a hypothesis

• Conducting an experiment

• Making observations

• Drawing a conclusion

For a hypothesis to be considered valid it must be __________________.

• testable and measurable

• a proven fact

• the same as a theory

• based on prior conclusions

• universally accepted

Tags

NGSS.MS-LS1-5

In an experiment, which variable is deliberately changed?

• Independent variable

• Dependent variable

• Control variable

• Constant variable

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

Which of the following is an example of a qualitative observation?

• The liquid is blue.

• The mass of the object is 2 kg.

• The temperature is 25°C.

• The height is 5 cm.

Which of the following scenarios best illustrates the use of a control group?

• A researcher tests a new fertilizer on one plant and compares its growth to another plant with no fertilizer.

• A teacher compares test scores of students in different grade levels.

• A doctor surveys patients about their preferences for different medications.

• A chef tastes different recipes to determine which is best.

What type of data is collected if participants rate their satisfaction on a scale from 1 to 5?

• Qualitative

• Quantitative

• Hypothetical

• Controlled

An experiment tests how temperature affects the dissolving time of sugar in water. What is the dependent variable?

• Temperature

• Type of sugar

• Dissolving time

• Amount of water

A scientist wants to study how different types of exercise affect heart rate. Participants are asked to perform three activities: walking, jogging, and running. The scientist measures their heart rate after 10 minutes of each activity. What is the independent variable in this experiment?

• The type of exercise

• The duration of exercise

• The participants' heart rate

• The fitness level of the participants

A scientist wants to study how different types of exercise affect heart rate. Participants are asked to perform three activities: walking, jogging, and running. The scientist measures their heart rate after 10 minutes of each activity. What is the dependent variable in this experiment?

• The type of exercise

• The participants' heart rate

• The duration of exercise

• The participants’ diet

What ensures that an experiment is reliable?

• Conducting it once.

• Having only one trial.

• Repeating the experiment multiple times.

• Avoiding the use of a hypothesis.

Tags

NGSS.MS-PS2-5