Question 1

Which of the following best distinguishes a scientific theory from a scientific law?

Accepted Answer

A law describes patterns in nature (how), while a theory explains why those patterns occur and organizes facts and research.

Question 2

A student measures the mass of a sample five times and records the following values: 7.2 g, 7.3 g, 7.2 g, 7.2 g, and 7.3 g. The accepted value is 7.8 g. Which statement best describes the data?

Accepted Answer

The data are precise but not accurate.

Question 3

Which of the following is an example of a quantitative observation?

Accepted Answer

The plant grew 5 centimeters in one week.

Question 4

In an experiment to test whether the amount of sunlight affects plant growth, which is the independent variable?

Accepted Answer

The amount of sunlight each plant receives

Question 5

A scientist observes that the ground is wet in the morning. Which of the following is an inference based on this observation?

Accepted Answer

It rained last night.

Question 6

Which of the following best describes the role of constants in a controlled experiment?

Accepted Answer

They are the aspects of the experiment that are kept the same to ensure that only the independent variable affects the results.

Question 7

Which of the following statements about hypotheses is correct?

Accepted Answer

A hypothesis is a testable prediction that describes a cause and effect relationship between variables.

Question 8

A researcher wants to test if a new fertilizer increases tomato yield. She applies the fertilizer to one group of plants and leaves another group untreated. What is the control group in this experiment?

Accepted Answer

The group that receives no fertilizer

Question 9

Which of the following best explains why repeated trials are important in scientific experiments?

Accepted Answer

They help eliminate errors and ensure the data are precise, not due to chance.

Question 10

Which of the following is NOT a characteristic of a scientific explanation?

Accepted Answer

It is based on opinions and beliefs that cannot be tested.

Question 11

A student writes the following hypothesis: 'If the temperature of water increases, then the rate at which sugar dissolves will increase.' Identify the independent and dependent variables.

Accepted Answer

Independent variable: temperature of water; Dependent variable: rate at which sugar dissolves

Question 12

Which of the following best describes the difference between science and technology?

Accepted Answer

Science answers questions based on observations, while technology solves problems based on human needs.

Question 13

Which of the following is the correct sequence of steps in the scientific method?

Accepted Answer

Ask a question → Conduct background research → Construct a hypothesis → Test hypothesis → Analyze data → Draw conclusions

Question 14

Which of the following is an example of a principle in science?

Accepted Answer

Greenhouse effect

Question 15

A scientist collects data that are consistent but far from the accepted value. Which term best describes the data?

Accepted Answer

Precise but not accurate

Question 16

Which of the following best describes the purpose of background research in the scientific method?

Accepted Answer

To define the purpose or objective of the experiment by understanding what is already known

Question 17

Which of the following is a correct statement about the relationship between data and hypotheses in science?

Accepted Answer

Data can only support or fail to support a hypothesis, but cannot prove or disprove it.

Question 18

In technological design, which step involves building and testing a prototype while making continual improvements?

Accepted Answer

Implementation

Question 19

Which of the following best illustrates the difference between an observation and an inference?

Accepted Answer

Observation: The plant is green. Inference: The plant is healthy.

Nature of Science: Foundations and Processes in Scientific Inquiry

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