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Quartz crystals normally used in quartz clocks etc. is chemically

  • A.Silicon dioxide
  • B.Germanium oxide
  • C.A mixture of germanium oxide and silicon dioxide
  • D.Sodium silicate

Answer: A

Quartz is chemically silicon dioxide, SiO2.

It is used in clocks because it is piezoelectric: an applied voltage makes the crystal flex, and a correctly cut sliver vibrates at an extremely stable 32,768 Hz. Dividing that frequency by two fifteen times gives a one-second pulse.

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