Displacement & Strain Measurement – 4

4. Quartz and Rochell salt belong to :

(a) natural group of piezo-electric materials
(b) synthetic group of piezo-electric materials
(c) can belong to natural or synthetic group of piezo-elctric materials provided properly polarized
(d) all of the given options

Answer : (a)

Explanation : No answer description available for this question. Let us discuss.

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