# Strength of Materials Questions and Answers – Stress & Strain Curve

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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on “Stress & Strain Curve”.

1. The slope of the stress-strain curve in the elastic deformation region is ____________
a) Elastic modulus
b) Plastic modulus
c) Poisson’s ratio
d) None of the mentioned

Explanation: The elastic modulus is the ratio of stress and strain. So on the stress strain curve, it is the slope.

2. What is the stress-strain curve?
a) It is the percentage of stress and stain
b) It is the relationship between stress and strain
c) It is the difference between stress and strain
d) None of the mentioned

Explanation: The relationship between stress and strain on a graph is the stress strain curve. It represents the change in stress with change in strain.

3. Which point on the stress strain curve occurs after the proportionality limit?
a) Upper yield point
b) Lower yield point
c) Elastic limit
d) Ultimate point

Explanation: The curve will be stress strain proportional upto the proportionality limit. After these, the elastic limit will occur.
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4. Which point on the stress strain curve occurs after the lower yield point?
a) Yield plateau
b) Upper yield point
c) Ultimate point
d) None of the mentioned

Explanation: The points on the curve comes in the given order,
A. proportionality limit
B. elastic limit
C. upper yield point
D. lower yield point
E. yield plateau
F. ultimate point
G. breaking point.

5. Which point on the stress strain curve occurs after yield plateau?
a) lower yield point
b) Upper yield point
c) Ultimate point
d) Breaking point

Explanation: After the yield plateau the curve will go up to its maximum limit of stress which is its ultimate point.
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6. Which point on the stress strain curve occurs after the ultimate point?
a) Last point
b) Breaking point
c) Elastic limit
d) Material limit

Explanation: After the ultimate point the value of stress will reduce on increasing of strain and ultimately the material will break.

7. Elastic limit is the point ____________
a) up to which stress is proportional to strain
c) Up to which if the load is removed, original volume and shapes are regained
d) None of the mentioned

Explanation: The elastic limit is that limit up to which any material behaves like an elastic material.

8. What is the point P shown on the stress strain curve? a) Upper yield point
b) Yield plateau
c) Elastic limit
d) Ultimate point

Explanation: It is the point showing the maximum stress to which the material can be subjected in a simple tensile stress.

9. What is the point P shown in the stress-strain curve? a) Lower yield point
b) Elastic limit
c) Proportionality limit
d) Breaking point

Explanation: The breaking point is the point where the material breaks. The breaking point will be the last point on the stress strain curve.

10. What is the point shown in the stress strain curve? a) Elastic limit
b) Lower yield point
c) Yield plateau
d) Lower strain point

Explanation: It is the lower yield point at which the curve levels off and plastic deformation begins.

11. Where is the necking region?
a) The area between lower yield point and upper yield point
b) The area between the plastic limit and elastic limit
c) The area between the ultimate point and initial point
d) The area between the ultimate point and rupture

Explanation: Necking is a tensile strain deformation which is cased in after the ultimate amount of stress occurs in the material.

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