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TX PACT Physical Science Grade 6 to 12 (737) Practice Tests & Test Prep by Exam Edge - Free Test


Our free TX PACT Physical Science Grade 6 to 12 (737) Practice Test was created by experienced educators who designed them to align with the official Texas Educator Certification Program content guidelines. They were built to accurately mirror the real exam's structure, coverage of topics, difficulty, and types of questions.

Upon completing your free practice test, it will be instantly reviewed to give you an idea of your score and potential performance on the actual test. Carefully study your feedback to each question to assess whether your responses were correct or incorrect. This is an effective way to highlight your strengths and weaknesses across different content areas, guiding you on where to concentrate your study efforts for improvement on future tests. Our detailed explanations will provide the information you need to enhance your understanding of the exam content and help you build your knowledge base leading you to better test results.

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TX PACT Physical Science Grade 6 to 12 - Free Test Sample Questions

Insulators are materials which contain tight electron bonds and restrict the flow of electrons. What is the electrical conductivity of insulators?

Correct Answer:
б < 10-8 s/cm


insulators are materials characterized by their ability to significantly impede the flow of electrical current. this resistance to electron movement is primarily due to the tight bonding of electrons within their atomic structures, which prevents these electrons from moving freely. common examples of insulators include materials like rubber, glass, and most plastics.

the electrical conductivity of a material is a measure of its ability to conduct an electric current. this property is quantitatively expressed in siemens per centimeter (s/cm). in the case of insulators, their electrical conductivity is extremely low because the electrons are not free to move across the material. specifically, the electrical conductivity of insulators is typically less than 10^-8 s/cm. this value indicates that insulators do not allow a significant amount of electrical current to pass through under normal conditions.

it's important to contrast this with conductors, such as metals, which have electrical conductivities many orders of magnitude higher, often greater than 10^4 s/cm. this considerable difference highlights why materials like copper and aluminum are used in wiring and electrical circuits where free electron flow is essential, whereas insulators are used to prevent unwanted current flow, thereby ensuring electrical safety and efficiency in various applications.