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Question 1: Which term describes a testable prediction about a cause-and-effect relationship?
- Conclusion
- Scientific model
- Hypothesis
- Observation
Answer: C. Hypothesis
Explanation: A hypothesis is a specific, testable prediction that explains how one variable might affect another in a scientific experiment, serving as the foundation for further investigation.
Question 2: What is the variable that a scientist changes or controls during an experiment?
- Independent variable
- Measured variable
- Controlled variable
- Dependent variable
Answer: A. Independent variable
Explanation: The independent variable is the specific factor that a scientist intentionally changes or manipulates during an experiment to observe its direct effect on the outcome.
Question 3: Which variable is measured to see how it responds to changes in an experiment?
- Controlled variable
- Dependent variable
- Constant variable
- Independent variable
Answer: B. Dependent variable
Explanation: The dependent variable is the factor being measured or observed in an experiment, which changes in response to the adjustments made to the independent variable.
Question 4: What is the purpose of a controlled variable in an experiment?
- To replace the hypothesis
- To make the test unfair
- To change the outcome
- To keep conditions constant
Answer: D. To keep conditions constant
Explanation: A control group is a standard set of subjects in an experiment that does not receive the experimental treatment, allowing for a baseline comparison of results.
Question 5: What is required to ensure a 'fair test' in an experiment?
- Changing one variable at a time
- Ignoring the hypothesis
- Changing all variables
- Avoiding data collection
Answer: A. Changing one variable at a time
Explanation: Constants are all the factors in an experiment that are kept exactly the same throughout the process to ensure that the results are caused only by the independent variable.
Question 6: Why do scientists perform replication by repeating experimental trials?
- To make the experiment longer
- To ensure results are reliable
- To change the hypothesis
- To avoid using tools
Answer: B. To ensure results are reliable
Explanation: Replication, or repeating experimental trials multiple times, helps ensure that the gathered data is reliable, consistent, and not simply the result of random chance or human error.
Question 7: What is a statement that explains the results of an investigation?
- A conclusion
- A variable
- An observation
- A hypothesis
Answer: A. A conclusion
Explanation: Qualitative data describes observations made using the five senses, such as color, texture, or smell, rather than using numerical measurements or specific mathematical values.
Question 8: What are metaphorical representations used to explain complex phenomena?
- Controlled trials
- Scientific models
- Testable questions
- Independent variables
Answer: B. Scientific models
Explanation: Scientific models are simplified representations, such as diagrams or physical structures, used to help scientists visualize, explain, and understand complex natural phenomena that are difficult to observe directly.
Question 9: What involves using senses or tools to gather information during an investigation?
- Hypothesizing
- Observation
- Modeling
- Concluding
Answer: B. Observation
Explanation: A scientific conclusion is a summary statement that explains whether the experimental data supports or rejects the original hypothesis based on the evidence collected during the study.
Question 10: What is the primary purpose of a hypothesis in the scientific method?
- To summarize the final results
- To prove a theory is absolute
- To provide a testable prediction
- To list all materials needed
Answer: C. To provide a testable prediction
Explanation: A hypothesis is a proposed explanation or prediction that can be tested through experimentation and observation.