Unary Phase Diagrams MCQ’s

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This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Unary Phase Diagrams”.

1. What are the external parameters that affect the phase structure?
a) Temperature, Pressure
b) Temperature, Composition
c) Pressure, Composition
d) Temperature, Pressure, Composition

2. What is the phase fraction of an alloy when it is one phase system?
a) 0.6
b) 0.8
c) 0.5
d) 1.0

3. Which of the following are examples of unary phase diagrams?
a) Cu-Ni phase diagram
b) Water phase diagram
c) Cu-Pd phase diagram
d) Mg-Db phase diagram

4. What will be the phase composition of a phase system?
a) The composition of each phase is same throughout the phase diagram
b) The composition of each phase is different throughout the phase diagram
c) Contains more than one composition in the entire phase diagram
d) Varies from molecule to molecule

5. Along the phase boundaries, the phases on either side will be in ______
a) Equal
b) Equilibrium
c) Different
d) Constant

6. What is the temperature at triple point of water?
a) 288 K
b) 273.16 K
c) 298 K
d) 277 K

7. Which of the following remains constant in Unary phase diagrams?
a) Pressure
b) Temperature
c) Composition
d) Both pressure and temperature

8. What is a triple point?
a) All three states are in equilibrium
b) All three states are not in equilibrium
c) All three states don’t exist
d) All three states don’t exist and are not in equilibrium

9. What is pressure at a triple point of water?
a) 5.08×10-3 atm
b) 6.04×10-3 atm
c) 7.04×10-3 atm
d) 6.44×10-3 atm

10. Which of the following is unary phase diagram?

materials-science-questions-answers-unary-phase-diagrams-q10a

a)

materials-science-questions-answers-unary-phase-diagrams-q10b

 b) 

materials-science-questions-answers-unary-phase-diagrams-q10c

c) 

materials-science-questions-answers-unary-phase-diagrams-q10d

d) 

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