Practice Test 9
•20 QuestionsRead the passage, then answer the question.
A science article explains why some materials conduct electricity well while others do not. It describes conductors, such as copper and aluminum, as materials whose electrons move easily, allowing electric current to flow with little resistance. In contrast, insulators like rubber, plastic, and glass hold their electrons more tightly, so current does not travel through them easily. The author makes the relationship clearer by using signal words: “such as” introduces examples, “in contrast” marks the difference, and “allowing” explains cause and effect (electron movement causes current to flow). Similarly, the article notes that real devices often use both categories together—for example, wires have metal cores for conducting and plastic coatings for insulating. As a result, the reader sees not only a definition, but also how the categories work together in everyday technology.
Question: How does the author categorize conductors and insulators in the passage?
Read the passage, then answer the question.
A science article explains why some materials conduct electricity well while others do not. It describes conductors, such as copper and aluminum, as materials whose electrons move easily, allowing electric current to flow with little resistance. In contrast, insulators like rubber, plastic, and glass hold their electrons more tightly, so current does not travel through them easily. The author makes the relationship clearer by using signal words: “such as” introduces examples, “in contrast” marks the difference, and “allowing” explains cause and effect (electron movement causes current to flow). Similarly, the article notes that real devices often use both categories together—for example, wires have metal cores for conducting and plastic coatings for insulating. As a result, the reader sees not only a definition, but also how the categories work together in everyday technology.
Question: How does the author categorize conductors and insulators in the passage?