Growth of Single Crystals MCQ

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• What is the disadvantage of using a solution growth method for the growth of the crystals?
  ক

  Rapid growth rates

  খ

  Simple apparatus

  গ

  Slow growth rates

  ঘ

  Isothermal conditions
• What is the advantage of using Czochralski, Bridgman- Stockbarger and Verneuil method?
  ক

  Gives small crystals

  খ

  High tech apparatus

  গ

  Rapid growth rates

  ঘ

  Uses plasma torch
• Which of the following method has been used to prepare the single crystals of CaO using plasma torch?
  ক

  Stockbarger method

  খ

  Zone melting method

  গ

  Verneuil flame fusion method

  ঘ

  Bridgman method
• When was the Verneuil flame fusion method first used?
  ক

  1207

  খ

  2016

  গ

  1503

  ঘ

  1904
• In the precipitation method for the growth of the crystal, the solvent melts are often known as___________
  ক

  Electrolyte

  খ

  α-particle

  গ

  β- particle

  ঘ

  Fluxes
• Which one of the following statements is correct for precipitation method?
  ক

  Growth of the crystal from a solvent of same composition to the crystals

  খ

  Growth of the crystal from the solute of same composition to the crystal

  গ

  Growth of the crystal from the gaseous species of different composition to the crystal

  ঘ

  Growth of the crystal from a solvent of different composition to the crystals.
• Which of the following statements describes best the Bridgman method?
  ক

  Melt is outside the temperature furnace, solidification begins at the hotter end

  খ

  Melt is inside the temperature furnace, solidification occurs at the cooler end

  গ

  Melt is inside the temperature furnace, solidification occurs at the hotter end

  ঘ

  Solidification is achieved by passing the melt through a temperature gradient
• Which of the following statements is appropriate for Stockbarger method?
  ক

  Solidification is achieved by passing the melt through a concentration gradient

  খ

  Solidification is achieved by passing the melt through a temperature gradient

  গ

  Liquefaction is achieved by passing the melt through a concentration gradient

  ঘ

  Liquefaction is achieved by passing the melt through a temperature gradient
• In the process of Czochralski method which of the following relation is appropriate between the melt and the growing crystals?
  ক

  Melt and the growing crystals are usually not related to each other

  খ

  Melt and the growing crystals are usually rotated counterclockwise

  গ

  Melt and the growing crystals are usually rotated clockwise

  ঘ

  Melt and the growing crystals are usually kept at a constant position
• The diagram given below represents which of the following method?
  ক

  Bridgman method

  খ

  Stockbarger method

  গ

  Czochralski method

  ঘ

  Zone melting method