This set of Materials Science Assessment Questions and Answers focuses on “Stress-Strain Behavior in Ceramics”.
1. Ceramics are brittle.
a) True
b) False
View Answer
Explanation: The above statement is true. Ceramics are generally not used in place of metals as they are brittle and their stress-strain characteristics are undesirable.
2. Which of the following test are done to find out the mechanical behavior of ceramics?
a) Tensile test
b) Compressive test
c) Shearing test
d) Transverse bending test
View Answer
Explanation: Transverse bending test is performed on the material to find out its mechanical behavior. Tensile and compressive tests cannot be performed on them as they crack when gripped.
3. What is shape of a stress strain curve for ceramics?
a) Parabola
b) Hyperbola
c) Straight line
d) Inverted parabola
View Answer
Explanation: The stress strain curve for a ceramic is a straight line as after a point the ceramic suddenly reaches the fracture point and breaks.
4. Which of the point is there in a stress strain curve for a ceramic?
a) Ultimate tensile strength
b) Fracture point
c) Limit of proportionality
d) Yield point
View Answer
Explanation: The correct answer is fracture point. Unlike metals or non metals, ceramics just break which is reach the fracture point after a certain amount of strain.
5. Which of the following is correct?
a) Aluminum oxide reaches fracture point before glass
b) Aluminum oxide reaches fracture point after glass
c) Aluminum oxide reaches fracture point at the same time as glass
d) They do not reach a fracture point
View Answer
Explanation: Aluminum oxide reaches fracture point before glass. In aluminum oxide for a large amount of stress little strain is produced.
6. Which of the following is correct?
a) Slope of stress strain curve of aluminum oxide is more than glass
b) Slope of stress strain curve of aluminum oxide is less than glass
c) Slope of stress strain curve of aluminum oxide is the same as glass
d) Slope of stress strain curve of aluminum oxide and glass are not comparable
View Answer
Explanation: The slope of stress strain curve of aluminum oxide is more than glass that is the curve for aluminum oxide is steeper than that of glass.
7. Which of the following can be the tensile strength of aluminum oxide?
a) 600 MPa
b) 800 Mpa
c) 1000 MPa
d) 1200 MPa
View Answer
Explanation: The range for the tensile strength of aluminum oxide which is a ceramic is 275 MPa – 700 MPa. Therefore only 600 Mpa lies in that range and is the correct answer.
8. Which of the following can be the tensile strength of spinel?
a) 200 MPa
b) 300 Mpa
c) 100 MPa
d) 90 MPa
View Answer
Explanation: The range for the tensile strength of spinel which is a ceramic is 110 MPa – 245 MPa. Therefore only 200 Mpa lies in that range and is the correct answer.
9. Which of the following can be the tensile strength of fused silica (SiO2)?
a) 110 MPa
b) 150 Mpa
c) 90 MPa
d) 80 MPa
View Answer
Explanation: The range for the tensile strength of fused silica (SiO2) which is a ceramic is 110 MPa. Therefore only 110 Mpa is the correct answer.
10. Silicon carbide is ductile.
a) True
b) False
View Answer
Explanation: Silicon carbide is a ceramic and hence it is not ductile. It does not have the elasticity to be drawn into wire. Any attempts to change its shape will break the ceramic.
Sanfoundry Global Education & Learning Series – Materials Science.
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