| (I) Piezoelectric crystals are used as pick-ups in record players, they are also used in microphones, ultrasonic generators, and sonar detectors. |
| (II) \[BaTi{{O}_{3}},\] Rochelle salt, \[K{{H}_{2}}P{{O}_{4}},\] and quartz are ferroelectric and piezoelectric solids. |
| (III) The temperature above which no ferromagnetism observed is called transition temperature. |
| (IV) The temperature at which the material shows super-conductivity is called curie temperature. |
A) I, II
B) II, III, IV
C) I, II, III
D) All of the above
Correct Answer: A
Solution :
[a] Factual statement
You need to login to perform this action.
You will be redirected in
3 sec
