This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Unary Phase Diagrams”.
1. 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
Explanation: The simplest phase diagram is the water which is a one component system.
2. What are the external parameters that affect the phase structure?
a) Temperature, Pressure
b) Temperature, Composition
c) Pressure, Composition
d) Temperature, Pressure, Composition
Explanation: The phase of the system changes accordingly with an increase or decrease in the above parameters.
3. What is the phase fraction of an alloy when it is one phase system?
Explanation: Alloy is composed entirely of that phase.
4. What will be the phase composition of one phase system?
a) Same as alloy present in it
b) Different than the alloy present in it
c) Contains more than one alloys
d) Varies from molecule to molecule
Explanation: It is the same as the overall composition of the alloy.
5. Which of the following remains constant in Unary phase diagrams?
d) Both pressure and temperature
Explanation: Since there is only one phase there will be only one substance.
6. Along the phase boundaries, the phases on either side will be in ______
Explanation: At phase boundary, the phase compositions will be the same.
7. 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
Explanation: In triple point, all the states exist and are in equilibrium.
8. What is the temperature at triple point of water?
a) 288 K
b) 273.16 K
c) 298 K
d) 277 K
Explanation: At 273.16 k all the three phases of water will be 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
Explanation: At 6.04×10-3 atm all the three phases of water will be in equilibrium.
Explanation: Unary phase diagram consists of only one substance.
Sanfoundry Global Education & Learning Series – Materials Science.
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