Interfacial Free Energy MCQs : Here you will find MCQ Questions related to "Interfacial Free Energy" in Phase Transformation. These Interfacial Free Energy MCQ Questions Will help you to improve your Phase Transformation knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations
Interfacial free energy is defined as the product of?
A. interfacial resistance and interface area
B. interfacial pressure and interface area
C. interfacial tension and interface area
D. interfacial temperture and interface area
Explanation: Interfacial free energy is defined as the product of interfacial tension and interface area, and the interface tries to make its area size smaller to minimize the interfacial free energy.
The interfacial free energy of a bilayer can be determined by measuring the?
C. Temparture difference
D. Pressure difference
Explanation: The interfacial free energy of a bilayer can be determined by measuring the pressure difference required to bow the membrane formed across a circular aperture in a septum dividing two aqueous compartments.
Interfacial free energy denoted by?
Explanation: Interfacial free energy denoted by Ym
Interfacial Free Energy also known as?
A. surface tension
B. surface pressure
C. surface tempature
D. surface gauge
Explanation: Interface free energy is the contribution to the free energy of a system due to the presence of an interface separating two coexisting phases at equilibrium. It is also called surface tension. The content of the article is the definition and main properties of the interface free energy from first principles of statistical mechanics.
In the case of a liquid film which of the following is true? (Where ᵞ is the interfacial free energy and A is the area of the interface).
A. (dᵞ/dA) > 0
B. (dᵞ/dA) < 0
C. (dᵞ/dA) = 0
D. Can not say
Explanation: In the case of a liquid film the surface energy is independent of the area of the interface and hence the value of (dy/dA)=0. This leads to the well-known result F = y i.e. a surface with a free energy y J m-2 exerts a surface tension of y Nm-1.
Why is the value of (dᵞ/dA) =0 in case of a liquid film?
A. Liquid develops viscous forces
B. Liquid can support shear stresses
C. Intermolecular forces in liquid is quite high
D. Liquid is unable to support shear stresses
Explanation: For a liquid the shear stress is something which is unbearable and it won’t be able to support that, so the atoms within the liquid can rearrange and redistribute at the time when they stretch and thereby maintain a constant surface structure. Solids are much more viscous and here the transfer of atoms occurs from the bulk to the surface.
The interfacial free energy appear dependent on the electrolyte concentration ?
C. Can be true or false
D. Can not say
Explanation: The interfacial free energy did not appear dependent on the electrolyte concentration (1 mM to 2 M) or electrolyte type (NaCl, KCl, LiCl and CaCl2).
The anisotropy in crystalline solid is prominent at ___
A. Lower temperature
B. Higher temperature
C. Zero degree Celsius
D. Cannot be predicted
Explanation: This anisotropy is more prominent at lower temperatures. As temperatures rise, the entropy contribution becomes dominant and makes the interfacial energy less anisotropic and if this happens the surface formed with different planes will have same energies in crystalline solids
Which of the following can be used to calculate surface energy of a solid?
A. Bond making model
B. Solid bond theory
C. Interface creation model
D. Bond breaking model
Explanation: Bond breaking model can be used to calculate the surface energy of a solid. We make a lot of assumption before creating this model which include that the solid is in contact with its own vapor, we also assume that the temperatures are low enough that the primary contribution to the surface energy comes from the broken bonds
γm is an important term in the condition for equilibrium for the bilayer?
C. Can be yes or no
D. Can not say
Explanation: Yes, γm remains an important term in the condition for equilibrium for the bilayer