Scientific Method & Engineering Process Flashcards
7 cards from real EMS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Scientific Method & Engineering Process flashcards as text
During an EMS audit, an auditor finds that corrective actions were implemented without identifying the root cause. Which step of the scientific method was skipped?
Answer: Hypothesis formulation
Hypothesis formulation — identifying the probable root cause — must precede corrective action to ensure the solution addresses the actual problem.
An organization uses statistical process control (SPC) charts to monitor wastewater discharge levels. This practice primarily supports which engineering process step?
Answer: Monitoring and measurement
SPC charts are a monitoring and measurement tool used to detect process variation and confirm that environmental controls remain effective.
Which of the following best describes a 'variable' in the context of environmental engineering experiments?
Answer: A measurable characteristic that can take different values across conditions
A variable is any measurable characteristic that may differ across experimental conditions, such as temperature, pH, or contaminant concentration.
An EMS internal auditor reviewing an air emissions reduction project notes that the team tested only one concentration level of a scrubber chemical. What scientific limitation does this represent?
Answer: Absence of independent variable variation
Testing only one concentration means the independent variable was not varied, making it impossible to determine the dose-response relationship.
The Plan-Do-Check-Act (PDCA) cycle used in ISO 14001 EMS most closely parallels which scientific method sequence?
Answer: Hypothesis → Test → Analyze → Conclude/Adjust
PDCA maps directly onto the scientific method: Plan=hypothesis, Do=experiment, Check=analyze results, Act=conclude and adjust.
An environmental engineer claims that reducing production line speed by 10% will decrease solvent emissions by 15%. Before implementing this change, the most scientifically rigorous next step is to:
Answer: Conduct a controlled pilot trial measuring emissions at the reduced speed
A controlled pilot trial tests the hypothesis under real conditions while limiting scope and risk, consistent with the experimental step of the scientific method.
In an EMS context, 'repeatability' of an environmental measurement refers to:
Answer: The consistency of results when the same test is performed multiple times under identical conditions
Repeatability is the closeness of agreement between successive measurements made under the same conditions by the same operator and equipment.