RCC Structures Design MCQ Questions & Answers

81

If the average bending stress is 6 kg/cm² for M 150 grade concrete, the length of embedment of a bar of diameter d according to I.S. 456 specifications, is

A) 28 d B) 38 d C) 48 d D) 58 d

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Answer & Solution

Answer: Option D

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82

A pre-stressed concrete member is preferred because

A) Its dimensions are not decided from the diagonal tensile stress B) Large size of long beams carrying large shear force need not be adopted C) Removal of cracks in the members due to shrinkage D) All the above

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Answer & Solution

Answer: Option D

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83

If the maximum bending moment of a simply supported slab is M Kg.cm, the effective depth of the slab is (where Q is M.R. factor)

A) $$\frac{{\text{M}}}{{100{\text{Q}}}}$$ B) $$\frac{{\text{M}}}{{10\sqrt {\text{Q}} }}$$ C) $$\sqrt {\frac{{\text{M}}}{{\text{Q}}}} $$ D) $$\sqrt {\frac{{\text{M}}}{{100{\text{Q}}}}} $$

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Answer & Solution

Answer: Option D

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84

If jd is the lever arm and $$\sum {\text{O}} $$ is the total perimeter of reinforcement of an R.C.C. beam, the bond stress at the section having Q shear force, is

A) $$\frac{{\text{Q}}}{{2{\text{jd}}\sum {\text{O}} }}$$ B) $$\frac{{\text{Q}}}{{3{\text{jd}}\sum {\text{O}} }}$$ C) $$\frac{{\text{Q}}}{{{\text{jd}}\sum {\text{O}} }}$$ D) $$2\frac{{\text{Q}}}{{{\text{jd}}\sum {\text{O}} }}$$

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Answer & Solution

Answer: Option C

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85

The minimum head room over a stair must be

A) 200 cm B) 205 cm C) 210 cm D) 230 cm

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Answer & Solution

Answer: Option C

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86

For stairs spanning $$l$$ meters longitudinally between supports at the bottom and top of a flight carrying a load w per unit horizontal area, the maximum bending moment per metre width, is

A) $$\frac{{{\text{w}}{l^2}}}{4}$$ B) $$\frac{{{\text{w}}{l^2}}}{8}$$ C) $$\frac{{{\text{w}}{l^2}}}{{10}}$$ D) $$\frac{{{\text{w}}{l^2}}}{{12}}$$ E) $$\frac{{{\text{w}}{l^2}}}{{16}}$$

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Answer & Solution

Answer: Option E

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87

If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is

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

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Answer & Solution

Answer: Option D

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88

Total pressure on the vertical face of a retaining wall of height ‘h’ per unit run exerted by the retained earth weighing ‘w’ per unit volume, is

A) $${\text{wh}}\frac{{\left( {1 - \sin \varphi } \right)}}{{\left( {1 + \sin \varphi } \right)}}$$ B) $${\text{w}}{{\text{h}}^2}\frac{{\left( {1 - \sin \varphi } \right)}}{{\left( {1 + \sin \varphi } \right)}}$$ C) $$\frac{{{\text{w}}{{\text{h}}^2}\left( {1 - \sin \varphi } \right)}}{{2\left( {1 + \sin \varphi } \right)}}$$ D) $$\frac{{{\text{w}}{{\text{h}}^2}\left( {1 - \sin \varphi } \right)}}{{3\left( {1 + \sin \varphi } \right)}}$$

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Answer & Solution

Answer: Option C

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89

According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is

A) 5 kg/cm² B) 10 kg/cm² C) 15 kg/cm² D) 20 kg/cm²

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Answer & Solution

Answer: Option A

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90

For a circular slab carrying a uniformly distributed load, the ratio of the maximum negative to maximum positive radial moment, is

A) 1 B) 2 C) 3 D) 5

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Answer & Solution

Answer: Option B

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RCC Structures Design MCQ Questions & Answers | Civil Engineering