Question

Very fast conduction of electricity by matter is called superconductivity. This happens when the matter is:

• A. dissolved in acids
• B. cooled to very low temperatures
• C. heated to high temperatures
• D. treated with radiation

Answer 1

Answer: (B)

cooled to very low temperatures

We know that resistance of a conductor is directly proportional to the temperature. So, when it is cooled below a certain temperature called critical temperature, the resistance tends to drop to zero and superconductivity can be observed.