Which of the following statements is true?
A) A metallic conductor is a substance with a resistance that increases with increasing temperature.
B) A superconductor is a substance that has zero resistance below a certain temperature.
C) An insulator is a substance that does not conduct electricity below a certain temperature.
D) A semiconductor is a substance with a resistance that increases with increasing temperature.
E) An insulator behaves like a metallic conductor with a very high resistance.

Question

Quizplus · Accepted Answer

A superconductor is a substance that has zero electrical resistance below a certain temperature, typically very low temperatures. This property is unique to superconductors and not seen in any other substance. Choice A is incorrect as a metallic conductor has a resistance that decreases with decreasing temperature, and is the opposite of the statement. Choice C is incorrect as an insulator is a substance that does not conduct electricity at any temperature, and not just below a certain temperature. Choice D is incorrect as a semiconductor is a substance whose conductivity lies between that of a conductor and an insulator, and its resistance decreases with increasing temperature, unlike the statement. Choice E is incorrect as an insulator behaves like a substance that does not conduct electricity at all, and not like a metallic conductor with high resistance.

Which of the Following Statements Is True