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Even though 'Xerography' is a photocopying method, but it is called

  • A.Diazographic
  • B.Thermographic
  • C.Electrofax
  • D.Electrostatic

Answer: D

Xerography is a photocopying method, since it makes copies with light, but the name used for it is electrostatic, because the image is formed by electrostatic charges on a photoconductive drum or plate and the toner powder sticks to the charged parts. Diazographic copying uses light-sensitive diazo chemicals and thermographic copying uses heat, so they are different. Electrofax is a different process that copies on specially coated paper. The answer is Electrostatic, option (D).

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