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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