Solid and Vapour Interfaces MCQ

Test your knowledge with important Solid and Vapour Interfaces MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Solid and Vapour Interfaces MCQs at Bissoy

• Equilibrium shapes can be determined experimentally by________
  ক

  Annealing large void inside a crystals

  খ

  Annealing large crystals at high temperature

  গ

  Annealing small crystals at low temperature

  ঘ

  Annealing small void inside a crystals
• A convenient method for plotting the variation of γ with surface orientation in three dimensions is to construct a surface about an origin such that the free energy of any plane is equal to the distance between the surface and the origin when measured along the normal to the plane. This type of polar representation is known as_____
  ক

  γ-plot

  খ

  Surface plot

  গ

  Energy plot

  ঘ

  α-γ plot
• The equilibrium shape has the property that the summation of Ai*γi (Ai represents the planes and γi their respective surface energies) is a minimum and the shape that satisfies this condition is given by the following, so-called as _________
  ক

  Wulff construction

  খ

  Marks construction

  গ

  Henrys diagram

  ঘ

  Twin diagram
• If we plot φ (angle between the crystal plane and closed packed plane) vs E (total surface energy), all the low index planes should be located at________
  ক

  Low energy cusps

  খ

  High energy cusps

  গ

  In between the low energy cusps and high energy cusps

  ঘ

  Cannot be determined
• For an isolated crystal bounded by the planes A1, A2, with energies γ1 and γ2 the total surface energy will be given by _______
  ক

  (A1 γ1) – (A2 γ2)

  খ

  (A1 γ1) / (A2 γ2)

  গ

  (A1- γ1)(A2- γ2)

  ঘ

  (A1 γ1) + (A2 γ2)
• A crystal plane is at an angle 45 to the close-packed plane. Calculate the energy of the surface, attributing E/2 energy to each broken bond? (Take the a value as 1(lattice parameter))
  ক

  E/2

  খ

  E

  গ

  2E

  ঘ

  (1/√2) E
• Melting point of Sn, Ag, Al, and Au are 232, 961, 660, and 1063(In Degree Celsius) given in their respective order. Which among the following values mentioned below corresponds to the surface energy of Sn? (Options corresponds to the surface energy of the above mentioned 4 elements in mJ m-2)
  ক

  680

  খ

  1080

  গ

  1390

  ঘ

  1120
• Extra configurational entropy can also be introduced into the surface by the formation of surface vacancies. Entropy effects γ is slightly dependent on temperature and is given as, γ = -2T+2. Calculate the entropy S from the given condition?
  ক

  T

  খ

  -2

  গ

  2

  ঘ

  T2
• Surface free energy is given by_____
  ক

  γ= E +PV+TS

  খ

  γ= E +PV/TS

  গ

  γ= E +PV*TS

  ঘ

  γ= E +PV-TS