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Quartz crystal in quartz watches work on the principle called?

APhotoelectric effect

BStark effect

CThermionic effect

DPiezo-electric effect

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Correct Answer: D: Piezo-electric effect

Explanation: The correct answer is D: Piezo-electric effect. Quartz crystals in quartz watches work on the principle of the Piezo-electric effect. When mechanical pressure is applied to quartz, it generates an electric voltage, and vice versa, providing extremely precise timekeeping.

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