Question

Which of the following is NOT true for supeconductors?

• A. All known superconductors prior to the ${1980}^{\prime }s$ only worked at temperatures below about $30$ Kelvins (-243$ degrees Celsius)
• B. When superconductors are at sufficiently low temperatures, they offer no electrical resistance
• C. Liquid helium was used to cool the first super conductors
• D. Liquid nitrogen can now be used to cool some kinds of superconductors
• E. "High-temperature supercondcutors," discovered in the ${1980}^{\prime }s$, can operate at room-temperature

Answer 1

The correct option is E "High-temperature supercondcutors," discovered in the ${1980}^{\prime }s$, can operate at room-temperature

All the superconductor prior to ${1980}^{\prime }$s only worked temperature below about 30K

and high temperature superconductors discovered in $2015$ at very temperature.