Kinetics of Phase Transformation MCQ

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• Radius of the new nuclei formed during heterogeneous nucleation depends on___________
  ক

  ∆T (undercooling)

  খ

  S(ϴ) (Is a function of the wetting angle)

  গ

  A (surface area of parent particle)

  ঘ

  V (volume of parent particle)
• The rate at which a transformation occurs will depend on the frequency with which atoms________
  ক

  Reach the activated state

  খ

  Deviate from the activated stage

  গ

  Vibrate in the activated stage

  ঘ

  Rotate in the activated stage
• Gibbs free energy of a homogeneous nucleation is _____
  ক

  Greater than heterogeneous nucleation

  খ

  Less than heterogeneous nucleation

  গ

  Greater than or equal to heterogeneous nucleation

  ঘ

  Less than or equal to heterogeneous nucleation
• The magnitude of surface free energy of a spherical particle increases with radius.
  ক

  True

  খ

  False
• The magnitude of the contribution of volume free energy of a spherical particle increases with radius.
  ক

  True

  খ

  False
• During homogeneous for a spherical, the change in Gibbs free energy involve_______
  ক

  Interfacial energy

  খ

  Volume free energy and surface free energy

  গ

  Rotational and Vibrational energy

  ঘ

  Surface free energy and vibrational energy
• Phase transformations in metals/alloys occur by _____
  ক

  Random motion

  খ

  Explosion

  গ

  Rotation and vibration

  ঘ

  Nucleation and growth
• Homogeneous nucleation occurs only when liquid is undercooled by___________
  ক

  Critical undercooling for nucleation

  খ

  Critical undercooling for growth

  গ

  Layered undercooling for nucleation

  ঘ

  Layered undercooling for growth
• Nucleation that takes place at the grain boundaries are known as___________
  ক

  Heterogeneous nucleation

  খ

  Homogeneous nucleation

  গ

  Partial nucleation

  ঘ

  Mixed nucleation
• Which among the following condition should be satisfied by heterogeneous nucleation?
  ক

  Occurs spontaneously

  খ

  Doesn’t have a preferential nucleation site

  গ

  Occurs randomly

  ঘ

  Occurs at preferential sites
• Which among the following condition should be satisfied by homogeneous nucleation?
  ক

  Occurs slowly

  খ

  Occurs at the preferential site

  গ

  Occurs in an orderly fashion

  ঘ

  Occurs randomly