Q.1
Which rule gives the relative number of moles of α and β that must be present, if the overall composition is given as some X? (α, β are stable forms of 2 substance)
  • a) Richard’s Rule
  • b) Raoul’s Rule
  • c) Henry’s Rule
  • d) Lever rule
Q.2
Properties of metallic material primarily depends on _____________
  • a) Processing
  • b) Type of crystal structure
  • c) Microstructure
  • d) Grain size
Q.3
The driving force for the phase transformation increases in proportion to__________
  • a) Microstructure
  • b) Change in composition
  • c) Degree of undercooling below critical temperature
  • d) Melting point
Q.4
In a general sense it is not possible to obtain any information about kinetics or the morphology of the phase mixture from the phase diagram.
  • a) True
  • b) False
Q.5
The first step in drawing the free energy curve of the FCC α phase is, to convert the stable BCC arrangement of β atoms into ____________
  • a) An unstable FCC arrangement
  • b) A stable FCC arrangement
  • c) A metastable BCC arrangement
  • d) An unstable BCC arrangement
Q.6
Which among the following condition the most stable state of a system should satisfy so that it can be defined as a state in which pure component has unit activity?
  • a) Highest free energy
  • b) Lowest free energy
  • c) Change in Gibbs energy 0
  • d) Positive free energy
Q.7
In heterogeneous systems containing more than one phase the pure components can, at least theoretically, exist in different crystal structures.
  • a) True
  • b) False
Q.8
Calculate the number of phases present in a system in equilibrium, if the degree of freedom isthe number of components and non-compositional variables are 1 and 2 respectively?
  • a) 1
  • b) 3
  • c) 0
  • d) 2
Q.9
What happens when the two Gibbs energy curves for the α- and β-phases have a common tangent and the equilibrium has been established?
  • a) Driving force for diffusion increases
  • b) Driving force for diffusion decreases
  • c) Driving force for diffusion remains constant
  • d) Driving force first decreases then increases
Q.10
The condition for equilibrium in a heterogeneous system containing two phases can also be expressed using the_____________
  • a) Lever’s concept
  • b) Raoults rule
  • c) Henrys rule
  • d) Activity concept
0 h : 0 m : 1 s