1) Which of the following statements about physical models is not true?
a. Physical models are often three-dimensional representations.
b. Physical models are used to represent an object or event.
c. Physical models are usually in the form of a graph.
d. Physical models can be used to depict microscopic objects.

2) Which of the following scenarios represents the best use of a scientific model?
a. predicting weather patterns
b. studying the result of mixing two chemicals
c. studying the effect of oil spills on plant growth
d. studying the speed of a ball down an inclined plane