Stemscopes Exam Mathematics in Science 2 — Questions and Answers
Question 1: What type of graph is best for showing how a quantity changes over time?
- Pie chart
- Bar graph
- Line graph (Correct answer)
- Scatter plot
Correct answer: Line graph
Line graphs are ideal for showing trends and changes in data over continuous intervals of time.
Question 2: In scientific notation, how is 6,500 written?
- 6.5 × 10²
- 6.5 × 10³ (Correct answer)
- 65 × 10²
- 0.65 × 10⁴
Correct answer: 6.5 × 10³
6,500 in scientific notation is 6.5 × 10³ because the decimal is moved three places to the left.
Question 3: What is the dependent variable in an experiment?
- The variable the scientist changes
- The variable the scientist measures (Correct answer)
- The variable held constant
- The hypothesis
Correct answer: The variable the scientist measures
The dependent variable is what is measured or observed in an experiment; it depends on the independent variable.
Question 4: What does a pie chart show?
- Change over time
- Parts of a whole as percentages (Correct answer)
- Correlation between two variables
- Range of data values
Correct answer: Parts of a whole as percentages
A pie chart displays how different categories make up parts of a whole, typically expressed as percentages.
Question 5: What is the median of: 3, 7, 5, 9, 1?
- 3
- 5 (Correct answer)
- 7
- 9
Correct answer: 5
Arranging values in order (1, 3, 5, 7, 9), the median is the middle value, which is 5.
Question 6: How is density calculated?
- Density = Mass + Volume
- Density = Mass × Volume
- Density = Mass ÷ Volume (Correct answer)
- Density = Volume ÷ Mass
Correct answer: Density = Mass ÷ Volume
Density is calculated by dividing an object's mass by its volume (D = m/V).
Stemscopes Exam Mathematics in Science 2
What type of graph is best for showing how a quantity changes over time?