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Question:

The one that is extensively used as a piezoelectric material is: amorphous silica, quartz, mica, tridymite.

mica.

quartz.

amorphous silica.

tridymite.

Solution:

Quartz is used as piezoelectric material. It produces electricity when any mechanical stress in the form of pressure is applied to it. Thus it is also used in watches and oscillators. Hence, the correct option is quartz.