Material Science Mcqs

Q:

Which of the following shows the best fracture strength?

A) Zircon B) Macor
C) Alumina D) There fracture strength are not comparable
 
Answer & Explanation Answer: A) Zircon

Explanation: Zircon shows the best fracture strength among the three elements, alumina, zircon and macor.

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15
Q:

The largest constituent elements and flaws increase the flexural strength.

A) True B) False
 
Answer & Explanation Answer: B) False

Explanation: The above statement is false. The smallest constituent element and flaws increase the flexural strength.

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14
Q:

For zircon for the same flaw size, the intensity factor is more than alumina.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: The above statement is true. For a given flaw size for example 50 micrometers, the intensity factor for zircon is 4.6 units and that of alumina is 3.7 units.

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15
Q:

For edge flaws to occur which of the following should be the value of constant in stress intensity factor formula?

A) 1.1 B) 1.2
C) 1.02 D) 1.12
 
Answer & Explanation Answer: D) 1.12

Explanation: The correct answer is 1.12. For an edge flaw to occur, the value of the constant in the stress intensity factor formula should be 1.12.

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13
Q:

Which of the following is a flexural strength not dependent on?

A) Force B) Distance between supports
C) Specimen width D) Length of specimen
 
Answer & Explanation Answer: D) Length of specimen

Explanation: Flexural strength is dependent on the force applied on the specimen, distance between the supports, width of the specimen and the height of the specimen and hence it does not depend on the length of the specimen.

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12
Q:

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
 
Answer & Explanation Answer: A) Aluminum oxide reaches fracture point before glass

Explanation: Aluminum oxide reaches fracture point before glass. In aluminum oxide for a large amount of stress little strain is produced.

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16
Q:

Silicon carbide is ductile.

A) True B) False
 
Answer & Explanation Answer: B) False

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.

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14
Q:

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
 
Answer & Explanation Answer: A) 110 MPa

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.

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