FAQ’s from IS Codes (IS456, IS875, IS1893, IS800…)

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1. As per IS 456 what are the formulas for calculating moment of resistance of rectangular sections without compression reinforcement

1. Annexure g – 1.1 a

2. Annexure g – 1.1 b

3. Annexure g – 1.1 c

4. Annexure g – 1.1 b & c

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2. As per IS 456 what is the formula to determine the depth of neutral axis for a rectangular section without compression reinforcement

1. Annexure g – 1.1.a

2. Annexure g – 1.1 b

3. Annexure g – 1.1 c

4. Annexure g – 1.1 b & c

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3. As per IS 456 how do we take care of negative moments at a discontinues edge of a slab panel

1. Annexure d – 1.6

2. Annexure d – 1.7

3. Annexure d – 1.8

4. Annexure d – 1.9

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4. In Which table of IS 456 is it expalined where do we find the value of design shear strength of concrete in beams without shear reinforcement

1. Table 15

2. Table 17

3. Table 19

4. Table 21

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5. In Which Clause of IS 456 is it expalined what are the assumptions for design using limit state of collapse for compression

1. 37.1

2. 38.1

3. 39.1

4. 40.1

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6. In Which table of IS 456 is it expalined what are the partial safety factors for loads for limit state of copalse and limit state of serviceability

1. Table 17

2. Table 18

3. Table 19

4. Table 20

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7. In Which Clause of IS 456 is it defined characteristic load

1. 36.2

2. 37.2

3. 38.2

4. 39.2

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8. In Which Clause of IS 456 is it expalined what is characteristic strength of concrete

1. 36.1

2. 36.4

3. 37.1

4. 37.4

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9. In Which Clause of IS 456 is it expalined what is limit state design

1. 33.1

2. 35.1

3. 37.1

4. 39.1

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10. In Which Clause of IS 456 is it expalined what is the min thickness at the edge of the footing

1. 34.1.1

2. 34.1.2

3. 35.1.2

4. 36.1.2

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11. In Which Clause of IS 456 is it expalined that beyond what thickness should we provide steel in two layers for shear walls

1. 32.4.1

2. 32.4.2

3. 32.5.1

4. 32.5.4

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12. In Which Clause of IS 456 is it expalined how do we design concrete walls

1. Section 3 or Annexure b

2. Section 4 or Annexure b

3. Section 5 or Annexure b

4. Section 6 or Annexure b

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13. In Which Clause of IS 456 is it expalined what is the permissible shear stress in flat slabs

1. 31.5.2

2. 31.5.3

3. 31.6.2

4. 31.6.3

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14. In Which Clause of IS 456 is it expalined what is the min thickness of a flat slab

1. 30.2.1

2. 31.2.1

3. 32.2.1

4. 33.2.1

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15. In Which Clause of IS 456 is it expalined what is middle strip in flat slab

1. 30.1.1

2. 31.1.1

3. 32.1.1

4. 33.1.1

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16. As per IS 456 in which clause it is explained what is column strip and flat slab

1. 32.1.1

2. 29.1.1

3. 30.1.1

4. 31.1.1

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17. As per IS 456 in which clause it is explained how to provide positive reinforcement in deep beam

1. 29.3.1

2. 29.3.2

3. 29.3.3

4. 29.3.4

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18. In which clause of IS 456 is it explained what is a deep beam

1. 28.1

2. 29.1

3. 30.1

4. 31.1

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19. As per IS 456 in which clause the length of the structure beyond which we provide expansion joint is explained

1. 25.2

2. 26.2

3. 27.2

4. 28.2

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20. In which clause of IS 456 expansion joints are explained

1. 25.1

2. 26.1

3. 27.1

4. 28.1

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21. What is the min dia of longitudinal bar for columns as per IS 456

1. 10 mm

2. 11 mm

3. 12 mm

4. 13 mm

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22. What are the min number of longitudinal bars to be provided for rectangular column and circular column as per IS 456

1. 4 & 4

2. 4 & 5

3. 4 & 6

4. 4 & 7

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23. What is the min longitudinal reinforcment for columns as per IS 456

1. 26.5.3.1

2. 26.5.3.2

3. 26.5.3.3

4. 26.5.3.4

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24. What is the max diameter of bars used for design of slabs in IS 456

1. Slab thichness by 4

2. Slab thickness by 2

3. Slab thickness by 8

4. Slab thickness by 6

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25. What is the max spacing of shear reinforcemnt in beam as per clause 26.5.1.5 in IS 456

1. 0.55

2. 0.65

3. 0.75

4. 0.85

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26. Which clause of IS 456 do we use to understand the max distance between the bars in tension

1. 24.3.3

2. 25.3.3

3. 26.3.3

4. 27.3.3

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27. As per IS 456 which clause do we use to understand the min spacing between the individual bars

1. 26.3.2.A

2. 26.3.2.B

3. 26.3.2.C

4. All of the above

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28. Which clause do we use to understand the slenderness limits for beams to ensure lateral stability?

1. 22.3

2. 23.3

3. 24.3

4. 25.3

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29. What are the limiting values of the span/depth ratio to be satisfied for horizontal deflection of beam/slab for spans over 10m, as per IS 456 which clause do we use?

1. 23.2.1.B

2. 24.2.1.B

3. 25.2.1.B

4. 26.2.1.B

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30. Which clauses from IS 456 do we use to find teh effective width of flange of T beams and L beams

1. 22.1.2

2. 23.1.2

3. 24.1.2

4. 25.1.2

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31. Which clauses from IS 456 do we use to see the critical section for shear

1. 22.3.2

2. 22.4.2

3. 22.5.2

4. 22.6.2

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32. BM & SF Coefficients in Table 12 & 13 of IS456 are valid for frames having spans which do not differ more than..

1. 15% of the longest span

2. 15% of the shortest span

3. 25% of the longest span

4. 25% of the shortest span

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33. Which clause in IS456 explains about precautions to be taken for lateral sway for structures?

1. 20.1

2. 20.3

3. 20.5

4. 20.7

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34. Clause for tolerances for cover in IS456?

1. 12.3.1

2. 12.3.2

3. 12.3.3

4. 12.3.4

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35. Clause for Cleaning and treatemnt of concrete formwork in IS 456?

1. 11.1

2. 11.2

3. 11.3

4. 11.4

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36. Clause in IS456 that mentions the minimum time of mixing of concrete?

1. 10.3.1

2. 9.3

3. 10.1

4. 10.2.3

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37. What is the clause concerned to discussion on the nominal cover to reinforcment in IS456?

1. 25.4

2. 26.4

3. 27.4

4. 28.4

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38. What are the codes concernd to Mild & Medium steel bars and HYSD steel bars?

1. IS456 and IS1873

2. IS423Part1 and IS1876

3. IS432Part1 and IS1786

4. IS243 Part1 and IS1678

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39. What is the clause concerned to usage of sea water for concrete mixing as per IS 456?

1. Clause 5.4.3

2. Clause 5.3.3

3. Clause 5.2.3

4. Clause 5.1.3

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40. What are the two popular Grades of Cement?

1. 53 and 34 Grade

2. 34 and 43 Grade

3. 43 and 53 grade

4. 53 and 63 Grade

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41. How many sections are there in IS 456?

1. 4 Sections 45 Clauses

2. 4 Sections 43 Clauses

3. 3 Sections 34 Clauses

4. 5 Section, 43 Clauses

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42. The maximum area of tension reinforcement in beams shall not exceed

1. 1.50%

2. 0,15%

3. 4%

4. 0.40%

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43. A continuous beam shall be deemed to be a deep beam if the ratio of effective span to overall depth, is

1. 2.5

2. 2

3. Less than 2

4. Less than 2.5

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

1. 50 cm

2. 75 cm

3. 100 cm

4. 120 cm

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45. Accoording to whitney’s theory , ultimate strain of concrete is assumed to be

1. 0.0003

2. 0.001

3. 0.003

4. 0.03

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46. The minimum diameter for longitudinal bars in a column is

1. 6 mm

2. 8 mm

3. 12 mm

4. 16 mm

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47. How many parts (books) does IS code 875 contain?

1. 5

2. 6

3. 7

4. 8

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48. In reinforced concrete footing on soil, the minimum thickness at edge should not be less than?

1. 100 mm

2. 150 mm

3. 200 mm

4. 250 mm

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49. Minimum pitch of transverse reinforcement in a column is?

1. The least lateral dimension of the member

2. Sixteen times the smallest diameter of longitudinal reinforcement bar to be tied

3. Forty-eight times the diameter of transeverse reinforcement

4. Least of the above three values

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50. If nominal shear stress Tv exceeds the design shear strength of concrete Tc, the nominal shear reinforcement as per IS:456-1978 shall be provided for carrying a shear stress equal to?

1. Tv

2. Tc

3. Tv-Tc

4. Tv+Tc

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