Ontario Grade 9 Science Class Practice Exam 2025 – Your Complete Guide to Exam Success!

Question: 1 / 400

Which of the following is an example of an insulator?

Copper

Rubber

Rubber is identified as an insulator because it effectively resists the flow of electric current and heat. Its molecular structure lacks free electrons, which means it does not conduct electricity well. In practical applications, rubber is often used to coat wires and electrical components to prevent accidental electrical contact and ensure safety.

In contrast, metals like copper, gold, and aluminum are excellent conductors due to their high density of free electrons, which facilitate the flow of electricity. This is why they are commonly used in electrical wiring and other applications where efficient conductivity is required. Rubber’s insulating properties make it essential for preventing electrical shocks and maintaining safety in electrical systems.

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Gold

Aluminum

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