Theory Of Structures MCQ Questions & Answers

71

A rolled steel joist is simply supported at its ends and carries a uniformly distributed load which causes a maximum deflection of 10 mm and slope at the ends of 0.002 radian. The length of the joist will be,

A) 10 m B) 12 m C) 14 m D) 16 m

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Answer: Option D

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72

The stiffness of the close coil helical spring is

A) $$\frac{{{{\text{d}}^4}{\text{N}}}}{{8{{\text{D}}^3}{\text{n}}}}$$ B) $$\frac{{{{\text{d}}^4}{\text{N}}}}{{4{{\text{D}}^3}{\text{n}}}}$$ C) $$\frac{{4{{\text{D}}^3}{\text{N}}}}{{{{\text{d}}^4}{\text{n}}}}$$ D) $$\frac{{8{{\text{D}}^3}{\text{N}}}}{{{{\text{d}}^4}{\text{n}}}}$$

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Answer: Option A

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73

Pick up the correct statement from the following:

A) In a loaded beam, the moment at which the first yield occurs is called yield moment B) In a loaded beam, the moment at which the entire section of the beam becomes fully plastic, is called plastic moment C) In a fully plastic stage of the beam, the neutral axis divides the section in two sections of equal area D) All the above

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Answer: Option D

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74

Maximum strain theory for the failure of a material at the elastic limit, is known as

A) Guest's or Trecas' theory B) St. Venant's theory C) Rankine's theory D) Haig's theory

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Answer: Option B

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75

A body is said to be in equilibrium if

A) It moves horizontally B) It moves vertically C) It rotates about its C.G. D) None of these

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Answer: Option D

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76

A close coil helical spring of mean diameter D consists of n coils of diameter d. If it carries an axial load W, the energy stored in the spring, is

A) $$\frac{{4{\text{W}}{{\text{D}}^2}{\text{n}}}}{{{{\text{d}}^4}{\text{N}}}}$$ B) $$\frac{{4{{\text{W}}^2}{\text{Dn}}}}{{{{\text{d}}^4}{\text{N}}}}$$ C) $$\frac{{4{{\text{W}}^2}{{\text{D}}^3}{\text{n}}}}{{{{\text{d}}^4}{\text{N}}}}$$ D) $$\frac{{4{{\text{W}}^2}{{\text{D}}^3}{{\text{n}}^2}}}{{{{\text{d}}^4}{\text{N}}}}$$

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Answer & Solution

Answer: Option C

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77

A two hinged parabolic arch of span $$l$$ and rise h carries a load varying from zero at the left end to $$\omega $$ per unit run at the right end. The horizontal thrust is

A) $$\frac{{\omega {l^2}}}{{4{\text{h}}}}$$ B) $$\frac{{\omega {l^2}}}{{8{\text{h}}}}$$ C) $$\frac{{\omega {l^2}}}{{12{\text{h}}}}$$ D) $$\frac{{\omega {l^2}}}{{16{\text{h}}}}$$

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Answer & Solution

Answer: Option D

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78

The maximum deflection due to a load W at the free end of a cantilever of length L and having flexural rigidity E$$I$$, is

A) $$\frac{{{\text{W}}{{\text{L}}^2}}}{{2{\text{E}}I}}$$ B) $$\frac{{{\text{W}}{{\text{L}}^2}}}{{3{\text{E}}I}}$$ C) $$\frac{{{\text{W}}{{\text{L}}^3}}}{{2{\text{E}}I}}$$ D) $$\frac{{{\text{W}}{{\text{L}}^3}}}{{3{\text{E}}I}}$$

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Answer & Solution

Answer: Option D

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79

The ratio of moments of inertia of a triangular section about its base and about a centroidal axis parallel to its base, is

A) 1.0 B) 1.5 C) 2.0 D) 3.0

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Answer: Option D

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80

Inertia of a rectangular section of width and depth about an axis passing the moment of through C.G. and parallel to its width is

A) $$\frac{{{\text{B}}{{\text{D}}^2}}}{6}$$ B) $$\frac{{{\text{B}}{{\text{D}}^3}}}{6}$$ C) $$\frac{{{\text{B}}{{\text{D}}^3}}}{{12}}$$ D) $$\frac{{{{\text{B}}^2}{\text{D}}}}{6}$$

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Answer: Option C

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Theory Of Structures MCQ Questions & Answers | Civil Engineering