Which of the following are piezo electric substances? 1. Barium titanate 2. Lead

Question - Which of the following are piezo electric substances?
1. Barium titanate
2. Lead titanate
3. Lead Zirconate
4. Cadmium and sulphate

Options:

A . 1, 2 and 4

B . 1, 3 and 4

C . 1, 2 and 3

D . 2, 3 and 4

Answer: Option C

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