WGU Integrated-Physical-Sciences - WGU Integrated Physical Sciences (MTC1) Certification Exam
Question #1 (Topic: demo questions)
Numerous experiments have confirmed that if the distance between a light source and an observer is
doubled, the intensity of the light as viewed by the observer decreases by a factor of four.
Which type of scientific statement is this?
Correct Answer: A
Explanation:
The statement that if the distance between a light source and an observer is doubled, the intensity of
The statement that if the distance between a light source and an observer is doubled, the intensity of
the light decreases by a factor of four, describes a consistent, repeatable observation that has been
confirmed through numerous experiments. This describes a scientific law, specifically the inverse
square law of light. A law summarizes a pattern found in nature, whereas a hypothesis is an untested
prediction, a theory is a well-substantiated explanation, and an inference is a conclusion drawn from
evidence. Reference:
Integrated Physical Sciences, Chapter 4: Scientific Laws and Theories
Question #2 (Topic: demo questions)
Which question would be appropriate for an observational study?
Correct Answer: D
Explanation:
An appropriate question for an observational study is one that involves collecting data through
An appropriate question for an observational study is one that involves collecting data through
observation without manipulation. "What types of rocks are found at a convergent boundary?"
requires observing and identifying the types of rocks naturally occurring at such geological
formations. It doesn't involve changing any variables, fitting the definition of an observational study.
Reference:
Integrated Physical Sciences, Chapter 2: Methods of Scientific Investigation
Question #3 (Topic: demo questions)
A scientist wants to determine how the speed of flowing water affects the size of sediment particles it
can carry. The scientist places a mix of sediment particles in the bottom of a trough and runs water
through the trough. The scientist varies the speed of the water and measures the sizes of the
particles that the water carries away.
Which type of investigation is the scientist using?
Correct Answer: B
Explanation:
The scientist is determining how the speed of flowing water affects the size of sediment particles it
Reference:
The scientist is determining how the speed of flowing water affects the size of sediment particles it
can carry by varying the water speed and measuring the sediment sizes. This involves manipulating
one variable (water speed) and observing the effect on another variable (sediment size), which is the
essence of a controlled experiment. The setting and control of conditions ensure that the
experimenter can establish a cause-and-effect relationship.
Reference:
Integrated Physical Sciences, Chapter 2: Methods of Scientific Investigation
Question #4 (Topic: demo questions)
Which question would be appropriate for an observational study?
Correct Answer: B
Explanation:
An observational study involves collecting data without manipulating any variables. The question
Reference: