RCC Structures Design MCQ Questions & Answers

31

Side face reinforcement shall be provided in the beam when depth of the web in a beam exceeds

A) 50 cm B) 75 cm C) 100 cm D) 120 cm

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Answer & Solution

Answer: Option B

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32

‘P’ is the pre-stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is ‘A’ and sectional modulus is ‘Z’. The minimum stress ‘f’ on the beam subjected to a maximum bending moment ‘M’ is

A) $${\text{f}} = \frac{{\text{P}}}{{\text{A}}} - \frac{{\text{Z}}}{{\text{M}}}$$ B) $${\text{f}} = \frac{{\text{A}}}{{\text{P}}} - \frac{{\text{M}}}{{\text{Z}}}$$ C) $${\text{f}} = \frac{{\text{P}}}{{\text{A}}} - \frac{{\text{M}}}{{\text{Z}}}$$ D) $${\text{f}} = \frac{{\text{P}}}{{\text{A}}} - \frac{{\text{M}}}{{6{\text{Z}}}}$$

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Answer & Solution

Answer: Option C

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33

If P kg/m² is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by

A) D = 0.00775 $${\text{a}}\sqrt {\text{P}} $$ B) D = 0.0775 $${\text{a}}\sqrt {\text{P}} $$ C) D = 0.07775 $${\text{a}}\sqrt {\text{P}} $$ D) D = 0.775 $${\text{P}}\sqrt {\text{a}} $$

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Answer & Solution

Answer: Option A

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34

The weight of a foundation is assumed as

A) 5% of wall weight B) 7% of wall weight C) 10% of wall weight D) 12% of wall weight

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Answer & Solution

Answer: Option C

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35

The diameter of the column head support a flat slab, is generally kept

A) 0.25 times the span length B) 0.25 times the diameter of the column C) 4.0 cm larger than the diameter of the column D) 5.0 cm larger than the diameter of the column

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Answer & Solution

Answer: Option A

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36

According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than

A) 20 cm B) 30 cm C) 40 cm D) 75 cm

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Answer & Solution

Answer: Option B

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37

According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than

A) 5 cm B) 10 cm C) 15 cm D) 20 cm

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Answer & Solution

Answer: Option C

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38

For M 150 grade concrete (1 : 2 : 4) the moment of resistance factor is

A) 0.87 B) 8.50 C) 7.50 D) 5.80

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Answer & Solution

Answer: Option B

Solution:

M150 grade concrete refers to a mix ratio of 1:2:4 (Cement : Sand : Aggregate), where the characteristic compressive strength (fck) is 15 N/mm².

The moment of resistance factor (R), also known as the limiting moment of resistance per unit width and square of effective depth, is a design parameter used in the limit state method for RCC beam design.

According to standard design aids and tables based on IS 456:2000, for M15 grade concrete, the commonly referred value of the moment of resistance factor is approximately 8.50.

Option A: 0.87 is incorrect, as it usually refers to the partial safety factor or percentage of steel yield stress, not the moment of resistance.

Option C: 7.50 and Option D: 5.80 are not the correct standard values for M150/M15 grade concrete.

Therefore, the correct answer is Option B: 8.50.

39

To have pressure wholly compressive under the base of a retaining wall of width b, the resultant of the weight of the wall and the pressure exerted by the retained, earth should have eccentricity not more than

A) $$\frac{{\text{b}}}{3}$$ B) $$\frac{{\text{b}}}{4}$$ C) $$\frac{{\text{b}}}{5}$$ D) $$\frac{{\text{b}}}{6}$$

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Answer & Solution

Answer: Option D

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40

For M 150 mix concrete, according to I.S. specifications, local bond stress, 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 B

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RCC Structures Design MCQ Questions & Answers | Civil Engineering