TeXes Science Practice Test

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Which of the following materials is NOT known to conduct electricity?

Aluminum
Copper
Rubber
Silver

The correct answer is: Rubber

The correct choice is rubber, as it is classified as an insulator. This means that rubber does not allow electric current to flow through it easily. Its molecular structure is such that it does not have free electrons available for conduction, making it effective in preventing the flow of electricity. This property is why rubber is commonly used in electrical insulation for wires and other electrical components. In contrast, aluminum, copper, and silver are all metals known for their excellent conductivity. They have free electrons that enable them to conduct electric current efficiently, which is why they are widely used in electrical applications. Copper, in particular, is a standard choice for electrical wiring due to its combination of conductivity and resistance to corrosion, while aluminum is often used in overhead power lines for its lightweight and cost-effective qualities. Silver, though more expensive, has the highest electrical conductivity of all metals.