Question

Superconductors are
$(A)$ Most exotic diamagnetic materials
$(B)$ Ferro magnetic material with low resistivity
$(C)$ Paramagnetic magnetic materials with high temperature
$(D)$ None of these

Answer 1

Superconductors are the most exotic diamagnetic materials. These are materials cooled to very low temperatures which exhibit both perfect conductivity and perfect diamagnetism. The superconductors can flow electrical current without any energy loss. This type of electrical current is called a supercurrent. Superconductors are materials that transport electric charge without resistance.
Complete answer:
Super Conductor:
A superconductor is an element or metallic alloy, it will be cooled below a certain threshold temperature, the material dramatically loses all electrical resistance. The critical temperature stands for the threshold temperature below which a material transition into a superconductor state is designated as ${T_c}$. Not all the materials turn into superconductors, and the materials that do each have their own value of ${T_c}$.
A superconductor is a substance that conducts electricity without resistance when it becomes colder than a "critical temperature." At this temperature, the electrons can move freely through the material. Superconductors are not like ordinary conductors, even very good ones.
Superconductors are diamagnetic materials:
The currents are induced in atomic orbitals by an applied magnetic field due to diamagnetism. Superconductors will take the diamagnetic effect to the extreme since in a superconductor the field is zero and the field is completely screened from the interior of the material.
Hence, the correct answer is superconductors are more exotic diamagnetic materials.

Note: Many materials exhibit some small amount of diamagnetism but the superconductors are strongly diamagnetic.
Diamagnetic has a magnetization that opposes any applied magnetic field, the superconductor is repelled by the magnetic field.
Water, wood, most organic compounds such as petroleum and some plastics, and many metals including copper are included in diamagnetic materials.