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

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1. As Per IS 456 what is the % of mid span tension reinforcement that we have to extend to the supports

1. Annexure a – 2.1.1

2. Annexure b – 2.1.1

3. Annexure c – 2.1.1

4. Annexure d – 2.1.1

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2. AS per IS 456 when is it not required to provide torsion reinforcement in slab

1. Annexure d – 1.9

2. Annexure d – 1.10

3. Annexure d – 1.11

4. Annexure d – 1.12

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3. As per IS 456 how do we provide torsion reinforcement in slab

1. Annexure c – 1.8

2. Annexure d – 1.8

3. Annexure e – 1.9

4. Annexure f – 1.9

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4. In Which table of IS 456 is it expalined where do we find the value of max shear stress of concrete in beams with shear reinforcement

1. Table 5

2. Table 15

3. Table 20

4. Table 25

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5. In Which Clause of IS 456 is it expalined what is equation for design of short column in compression with biaxial bending

1. 39.5

2. 39.6

3. 40.5

4. 40.6

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6. 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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7. In Which Clause of IS 456 is it expalined for assign the strength of structure what partial safety factors should we take for concrete and steel

1. 36.4.2.1

2. 36.5.2.1

3. 36.6.2.1

4. 36.7.2.1

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8. 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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9. In Which Clause of IS 456 is it expalined where do we calculate the highest bending moment for isolated footings

1. 34.2.2.2

2. 34.2.3.2

3. 34.2.4.2

4. 34.2.5.2

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10. In Which Clause of IS 456 is it expalined what is the max spacing of bars in a flat slab

1. 31.5.1

2. 31.6.1

3. 31.7.1

4. 31.8.1

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11. 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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12. 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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13. 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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14. 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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15. 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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16. What should be the pitch of lateral ties in columns in IS 456

1. 26.5.3.3.C1

2. 26.5.3.3.C2

3. 26.5.3.3.C3

4. 26.5.3.3.C4

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17. What is the max spacing of longitudinal bars along the perifery of the column as per IS 456

1. 150 mm

2. 200 mm

3. 250 mm

4. 300 mm

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18. Which clause do we use to understand the min reinforcment in slab to be provided as per IS 456

1. 23.5.2.1

2. 24.5.2.1

3. 25.5.2.1

4. 26.5.2.1

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19. 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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20. Which clause of IS 456 do we use to understand the MAx area of a compression reinforcment as per IS 456

1. 26.5.1.2

2. 26.5.2.2

3. 26.5.3.2

4. 26.5.4.2

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21. What is the code for detailing earthquake resitant construction

1. IS 13902

2. IS 19302

3. IS 13920

4. IS 19320

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22. 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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23. 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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24. 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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25. BM & SF Coefficients in Table 12 & 13 of IS456 are valid for frames with..

1. 3 spans or more

2. 4 Spans or more

3. 1 Span

4. Fixed Beam

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26. In which clause the effective span of a continues beam or slab is discussed in IS456?

1. 22.2.A

2. 22.2.B

3. 22.2.C

4. 22.2.D

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27. Which clause in IS456 explains about precautions to be taken for overturning of structures?

1. 20.1

2. 20.2

3. 20.3

4. 20.4

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28. What is the code concerned to dead loads consideration on structures?

1. IS875-1

2. IS875-2

3. IS875-3

4. IS875-5

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29. What is the method of design usally adopted in design of structural elements

1. 18.1.1 & 18.1.2

2. 18.2.1 & 18.2.2

3. 18.3.1 & 18.3.2

4. 18.4.1 & 18.4.2

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30. What should be the curing period to achieve 90% strength?

1. 7 days

2. 28 days

3. 18 days

4. 12 days

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31. 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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32. What is the table concerned to water cement ratios for different grades of concrete with 20mm aggregate?

1. Table 4

2. Table 5

3. Table 6

4. Table 7

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33. What is the relation between tensile strength and compressive strength of concrete in IS 456

1. Tensile Strength Fcr = 0.75 SQRT FCK

2. Tensile Strength Fcr = 0.77 SQRT FCK

3. Tensile Strength Fcr = 0.9 SQRT FCK

4. Tensile Strength Fcr = 0.7 SQRT FCK

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34. What is the table in IS 456 concerned to usage of Grades of concrete for plain and reinforced Concrete?

1. Table 5 (IS 456)

2. Table 2 (IS 456)

3. Table 4 (IS 456)

4. Table 1 (IS 456)

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35. 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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36. What should be the PH value of water used for mixing concrete as per IS 456?

1. Should not be less than 6

2. Should not be less than 4

3. Should not be less than 3.5

4. Should not be more than 7

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37. 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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38. The diameter of longitudinal bars of a column should never be less than..

1. 6 mm

2. 8 mm

3. 10 mm

4. 12 mm

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39. 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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40. According to whitney’s theory, the maximum depth of concrete stress block in a balanced RCC beam section of depth “d” is..

1. 0.43 d

2. 0.537 d

3. 0.68 d

4. 0.85 d

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41. The design yield stress of steel according to IS: 456-2002 is

1. 0.37 fy

2. 0.57 fy

3. 0.67 fy

4. 0.87 fy

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42. The minimum cover for a column should not be less than

1. 15 mm

2. 25 mm

3. 40 mm

4. 45 mm

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43. The Effective length is of a columns of length having both the ends fixed is?

1. 2L

2. L

3. L/2

4. L

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44. Which IS code gives specifications about dimensions for hot rolled steel structures?

1. IS 806-1989

2. IS 808-1979

3. IS 806-1968

4. IS 806-1969

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45. IS 1893-2002 gives details on?

1. Seismic strengthning

2. Retaining walls

3. Wind load design

4. Criteria for Earthquake Resistant Design of Structures

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46. Which is the most basic IS code for a Civil engineering designs?

1. IS 567

2. IS 456

3. IS 455

4. IS 383

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47. The percentage of reinforcement in slabs, when HYSD bars are used should not be less than?

1. 0.15

2. 0.12

3. 0.3

4. 1

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48. According to IS:456-1978, the maximum percentage of reinforcement in a column to avoid congestion is?

1. 2

2. 4

3. 6

4. 8

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49. The minimum cover in a slab should neither be less than the diameter of bar nor less than

1. 10 mm

2. 15 mm

3. 25 mm

4. 13 mm

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50. According to IS:456-1978, minimum slenderness ratio for a short column is?

1. Less than 12

2. Less than 18

3. Between 18 and 24

4. More than 24

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