STEM Scientific Method & Engineering Process 2 — Questions and Answers
Question 1: A student notices that plants near a window grow taller than those in a darker corner. Which step of the scientific method does this observation most directly lead to?
- Forming a hypothesis (Correct answer)
- Conducting an experiment
- Analyzing data
- Drawing a conclusion
Correct answer: Forming a hypothesis
An observation prompts the formation of a testable hypothesis about the relationship between light and plant growth.
Question 2: In the engineering design process, what is the primary purpose of the 'Define the Problem' phase?
- To brainstorm as many solutions as possible
- To clearly identify constraints, criteria, and the need being addressed (Correct answer)
- To test the prototype under real conditions
- To select the best solution from several alternatives
Correct answer: To clearly identify constraints, criteria, and the need being addressed
Defining the problem establishes the criteria for success and the constraints that any solution must satisfy.
Question 3: Which type of variable is deliberately changed by the researcher in a controlled experiment?
- Dependent variable
- Controlled variable
- Independent variable (Correct answer)
- Confounding variable
Correct answer: Independent variable
The independent variable is the one the experimenter intentionally manipulates to observe its effect on the dependent variable.
Question 4: A research team tests three different bridge designs under identical load conditions. What role do the identical load conditions serve?
- They act as the independent variable
- They serve as controlled variables to ensure a fair test (Correct answer)
- They represent the dependent variable
- They eliminate the need for a control group
Correct answer: They serve as controlled variables to ensure a fair test
Keeping load conditions identical controls extraneous variables so that differences in bridge performance can be attributed to design alone.
Question 5: After testing a prototype, engineers find it fails to meet one of the design criteria. According to the engineering design process, what should happen next?
- Abandon the project and start a completely new one
- Publish the results as a failure
- Iterate by revising the design and testing again (Correct answer)
- Redefine the criteria to match the prototype's performance
Correct answer: Iterate by revising the design and testing again
Iteration — revising and retesting — is a core feature of the engineering design process that leads to improved solutions.
Question 6: Which of the following best describes a 'null hypothesis'?
- A hypothesis that predicts a specific positive outcome
- A statement that assumes no relationship or effect exists between variables (Correct answer)
- A hypothesis based solely on qualitative data
- A prediction that the experiment will fail
Correct answer: A statement that assumes no relationship or effect exists between variables
The null hypothesis states there is no significant relationship between variables, serving as the default position to be tested.
Question 7: A teacher asks students to rank five materials by thermal conductivity from most to least conductive. What type of data are students producing?
- Nominal data
- Interval data
- Ordinal data (Correct answer)
- Ratio data
Correct answer: Ordinal data
Ordinal data places items in a ranked order but does not specify the magnitude of differences between ranks.
STEM Scientific Method & Engineering Process 2
A student notices that plants near a window grow taller than those in a darker corner.
Which step of the scientific method does this observation most directly lead to?