# Multiple Choice Questions (MCQ) with Answers on Bending Stress

**Multiple Choice Questions (MCQ) with Answers on Bending Stress**

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**1-Which of the machine component is designed under bending stress?**

- Shaft
- Arm of a lever
- Key
- Belts and ropes

(Ans: b)

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**2-For bending equation to be valid, radius of curvature of the beam after bending should be**

- Equal to its transverse dimensions
- Infinity
- Very large compared to its transverse dimensions
- Double its transverse dimensions

(Ans: c)

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**3-Neutral axis of a beam always coincides with**

- Axis passing through bottom of beam
- Axis passing through height h/2 from bottom
- Axis passing through height h/3 from bottom
- Axis passing through centroid

(Ans: d)

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**4-Moment of resistance of a beam**

- Is equal to safe maximum bending moment to which it can be subjected
- Is equal to any bending moment to which it is subjected
- Is equal to or less than maximum bending moment to which it is subjected
- Is equal to or more than maximum bending moment to which it is subjected

(Ans: a)

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**5-Section modulus of a beam is always given by formula**

- Πd^3/32
- bd^2/6
- I/y(max)
- I/y

(Ans: c)

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**6-Moment of Inertia of a rectangular section about any axis=**

- bd^3/12
- db^3/12
- bd^3/12 + Ax^2
- πd^4/64

Where b=width, A=Area of cross section, d=depth for rectangular section and diameter of circular sections, x=distance between the centroid of the section from the axis

(Ans: c)

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**7-Two beams have same length and same weight and same material. One beam has solid circular section and other hollow circular section with outside diameter/inside diameter ratio=K and having moment of resistance=M, then**

- both beams will have same strength in terms of M
- Solid beam will have more strength in terms of M
- Hollow beam will have more strength in terms of M and it will be a function of K
- Hollow beam will have more strength in terms of M and it will be independent of K

(Ans: c)

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**8-If depth of a beam is doubled then changes in its section modulus**

- Will remain same
- Will decrease
- Will be doubled
- Will increase by 4 times

(Ans: d)

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**9-Centroid of a section is**

- About which ∫y^2dA =0
- About which ∫ydA=0
- About which ∫xydA=0
- About which ∫x^2y^2dA=0

(Ans: b)

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**10-Moment of inertia of a section is**

- ∫y^2dA
- ∫ydA
- ∫xydA
- ∫x^2y^2dA

(Ans: a)

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