Which of the following statement is//are correct?A. Piezoelectric crystals are used as pick-ups in record players, they are also used in microphones, ultrasonic generators, and sonar detectors.B. `BaTiO_(3)`, Rochelle salt, `KH_(2)PO_(4)`, and quartz are ferroelectric and piezoelectric solids.C. The temperature above which no ferromagnetism is observed is called curie termperature.D. The temperature at which the material shows super-conductivity is called transition termperature.

Which of the following statement is//are correct?A. Piezoelectric crys

1.	Which of the following statement is//are correct?A. Piezoelectric crystals are used as pick-ups in record players, they are also used in microphones, ultrasonic generators, and sonar detectors.B. `BaTiO_(3)`, Rochelle salt, `KH_(2)PO_(4)`, and quartz are ferroelectric and piezoelectric solids.C. The temperature above which no ferromagnetism is observed is called curie termperature.D. The temperature at which the material shows super-conductivity is called transition termperature.
Answer» Correct Answer - A::B::C::D (a, b, c, d) All fectual statements.

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