Mod K, Unit 2 Final Exam

Identifying the independent and dependent variables in an experiment will help you better interpret and convey results. What is the difference between the independent and dependent variables in an experiment?

• The independent variable is always a number, and the dependent variable is never a number.

• The independent variable is what you control, and the dependent variable is what changes as a result.

• The dependent variable is what the investigator controls, and the independent variable is what happens as a result of this.

• The dependent variable is typically found in the first column of a table, and the independent variable is typically found in the second column.

Which of the following is a limitation of using a model to study something?

• A model cannot represent a thing exactly.

• A model cannot help study things that are dangerous.

• A model cannot reproduce things that are too far away.

• A model cannot show things that are too small or too large.

Scientists often use visual or mathematical representations to investigate items that are very large, very small, or otherwise difficult to study. What are these visual or mathematical representations called?

• experiments

• hypotheses

• models

• observations

A graph can help scientists display and convey data. What part of a line graph shows trends?

• title

• legend

• x- and y-axis labels

• line of best fit

The pie graph below shows the distribution of grades on a test taken in Dr. Kurilla’s class.

If 20 students took the test, how many students earned a grade of B or better?

• 9 students

• 12 students

• 15 students

• 18 students

A scientist wants to track a hurricane and predict where it will go next. What is the best tool for the scientist to use?

• a computer

• a hand lens

• an electron microscope

• a magnetic resonance image

Tags

NGSS.MS-ESS2-5

NGSS.MS-ESS2-6

NGSS.MS-ESS3-2

Which of the following is the most likely reason why scientists use approximate measurements?

• Scientists do not use approximate measurements as that would be unscientific.

• Scientists use approximate measurements to determine whether the data they collected is reasonable.

• Scientists use approximate measurements to record images of objects or environments in a brief interval of time.

• Scientists use approximate measurements to help take measurements that cannot be detected by the senses alone.

Why was the International System of Units (SI) developed?

• It was developed to compete with the English Standard System of Units.

• It was developed to allow countries to follow their own systems of measurement.

• It was developed to help scientists keep their data, observations, and measurements secret from other scientists.

• It was developed to help scientists compare measurements made by different people in different locations using different tools.

The image attached shows four measurements (small dots) and an actual value (larger center).

How can we describe these measurements in terms of accuracy and precision?

• The measurements are accurate but not precise.

• The measurements are precise but not accurate.

• The measurements are both accurate and precise.

• The measurements are neither accurate nor precise.

You are making a measurement using meters and find that the number value is 10. What is the correct way to write this scientific measurement?

• meters

• 10

• 10 meters

• meters 10