Phase Transformation MCQs : Here you will find MCQ Questions related to "basics" in Phase Transformation. These basic 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
Which of the following is not a basic states of matter?
Explanation: phase transitions (or phase changes) are the physical processes of transition between the basic states of matter: solid, liquid, and gas, as well as plasma in rare cases.
A ______________ transformation, in which a two-component single-phase liquid is cooled and transforms into two solid phases
C. spinodal decomposition
Explanation: A eutectic transformation, in which a two-component single-phase liquid is cooled and transforms into two solid phases. The same process, but beginning with a solid instead of a liquid is called a eutectoid transformation.
Phase transitions occur when the thermodynamic free energy of a system is non-analytic for some choice of thermodynamic variables.
C. Can be yes or no
D. Can not say
Explanation: Yes, Phase transitions occur when the thermodynamic free energy of a system is non-analytic for some choice of thermodynamic variables
Which of the following are also called continuous phase transitions?
A. First-order phase transitions
B. Second-order phase transitions
C. Third-order phase transitions
D. Fourth-order phase transitions
Explanation: Second-order phase transitions are also called continuous phase transitions. They are characterized by a divergent susceptibility, an infinite correlation length, and a power law decay of correlations near criticality.
Which of the following is a measure of the degree of order across the boundaries in a phase transition system?
A. Critical points
C. Both A and B
D. Order Parameter
Explanation: An order parameter is a measure of the degree of order across the boundaries in a phase transition system; it normally ranges between zero in one phase (usually above the critical point) and nonzero in the other.
Which of the following is a spontaneous exothermic process?
A. Ice melting
B. Removal of sugar from the coffee
D. Dissolution of sand in water
Explanation: Rusting is spontaneous exothermal process .Melting of ice is a spontaneous endothermic process and the last two are non-spontaneous in nature.
If we consider that there are no volume and enthalpy changes caused by mixing, then the only contribution to the entropy will be__________
Explanation: The only contribution to the entropy will be Configurational. Configurational entropy comes from the possibility of arranging the atoms A and B in different ways for a particular macro state
Properties of metallic material primarily depends on _____________
B. Type of crystal structure
D. Grain size
Explanation: The properties of metallic material primarily depends on chemical composition and processing. This is the property that decides the microstructure that gets developed into the material.
According to Gibbs rule the number of phases (P) present in a system in equilibrium is given as_________
Explanation: P+F=C+N, where F is the degree of freedom, N is the non-compositional variable and C is the number of components. Here the degree of freedom is an intensive variable hence can be varied independently while still maintaining the equilibrium.
First-order phase transitions are those that involve a latent heat.
C. Can be true or false
D. Can not say
Explanation: True, First-order phase transitions are those that involve a latent heat