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# Materials Science MCQ’s – Stress Transformation

1 - Question

How many shear stress components can act on a 3-D object?

a) 2

b) 4

c) 5

d) 6

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Answer: dExplanation: On a 3-dimensional body, total 9 stress components can act, out of which 3 are normal stress components while 6 of the other are tangential or shear stress component.

2 - Question

Which type of stress is plane stress?

a) One dimensional

b) Two dimensional

c) Zero dimensional

d) Three dimensional

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Answer: bExplanation: Plane stress is a two-dimensional stress in which stress components on any one direction is zero. For eg. All the stress components pertaining to z component is zero.

3 - Question

Principal plane is the plane in which ___________

a) Shear stress is maximum

b) Normal stress is zero

c) Shear stress is zero

d) It doesn’t depend upon stresses

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Answer: cExplanation: Principle planes are those planes where the value of shear stress is equal to zero and maximum or minimum value of normal stress is present at these points.

4 - Question

In a Mohr’s circle drawn on the x-y plane, which axis is the axis where normal stress is plotted?

a) X-axis

b) Y- axis

c) Z-axis

d) Normal stress isn’t related to Mohr’s circle

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Answer: aExplanation: In a Mohr’s circle, the x-axis or the horizontal axis in the x-y plane is the axis on which normal stress is plotted on. This axis is also called the abscissa.

5 - Question

In a Mohr’s circle drawn on the x-y plane, which axis is the axis where shear stress is plotted?

a) X-axis

b) Y- axis

c) Z-axis

d) Shear stress isn’t related to Mohr’s circle

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Answer: bExplanation: In a Mohr’s circle, the y-axis or the vertical axis in the x-y plane is the axis on which normal stress is plotted on. This axis is called the ordinate.

6 - Question

Which of following is not a graphical method for representing stress?

a) Lame’s stress ellipsoid

b) Cauchy’s stress quadric

c) Lame’s stress circle

d) Mohr’s circle

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Answer: cExplanation: Lame’s stress circle cannot be used for graphical representation of stresses while Lame’s stress ellipsoid, Mohr’s circle and Cauchy’s stress quadric are used for graphically representing stress.

7 - Question

Double angle method is a method to solve the problem in Lame’s stress ellipsoid.

a) True

b) False

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Answer: bExplanation: Double angle method cannot be used to solve Lame’s stress ellipsoid problems, it is used in case of Mohr’s circle. This method mainly has two rule you need to follow.

8 - Question

Principal stress is only the minimum stress.

a) True

b) False

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Answer: bExplanation: Principal stresses are maximum and minimum stresses which act on the body and planes on which they act are called the principal plane.