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# Which of the following ceramics are used as super conductors?

$(a)\;\text{Sodium aluminium silicate glass} \\ (b)\;\text{yittrium barium copper oxide} \\(c)\;\text{china day} \\ (d)\;\text{tungsten carbides}$

Certain ceramics are used as super conductors to achieve very low temperature .
One such material is yittrium - barium copper oxide $(YBa_2CH_3O_7)$ which has a temperature of aleont $92\;k$
Hence b is the correct answer.