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

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1. 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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2. As per IS 456 how do we provide tension reinforcement in slabs

1. Annexure a – 1.4 & 1.5

2. Annexure b – 1.4 & 1.5

3. Annexure c – 1.4 & 1.5

4. Annexure d – 1.4 & 1.5

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3. In Which Clause of IS 456 is it expalined what is the formula for nominal shear stress in beams of uniform depth

1. 39.1

2. 40.1

3. 41.1

4. 42.1

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

1. 36.1

2. 37.1

3. 38.1

4. 29.1

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6. 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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7. In Which Clause of IS 456 is it expalined what is the nominal reinforcement for footings greater than 1m depth

1. 33.5.1

2. 33.5.2

3. 34.5.2

4. 35.5.2

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8. 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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9. 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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10. 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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11. 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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12. 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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13. 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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14. 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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15. Which clause of IS 456 do we use to understand the min shear reinforcment in beam

1. 26.5.1.6

2. 27.5.1.6

3. 28.5.1.6

4. 29.5.1.6

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16. Which Clause do we use to call a member as a column as per IS 456?

1. 24.1.1

2. 24.2.1

3. 25.1.1

4. 25.2.1

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17. 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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18. As per IS 456 which clause do we use to limiting value of defliection for horizontal members

1. 21.2

2. 22.2

3. 23.2

4. 24.2

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19. Which clauses from IS 456 do we use to assume the salb as a compression flange of a T beam or L beam

1. 21.1.1

2. 22.1.1

3. 23.1.1

4. 24.1.1

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20. 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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21. 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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22. Which clause from IS 456 is the arrangement of the live load is discussed?

1. 22.4.1.A

2. 23.4.1.A

3. 24.4.1.A

4. 25.4.1.A

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23. In the analysis of a continuous Frame, the effective span of a member is arrived as?

1. Centre to centre distance.

2. Outer Edge to Outer Edge distance.

3. Inner Edge to Inner Edge

4. None of the above

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24. 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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25. 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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26. 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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27. When should one carry the load test on structures

1. After 28 Days from placing of concrete

2. After 7 Days from placing of concrete

3. After 14 Days from placing of concrete

4. After 21 Days from placing of concrete

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28. What are the clauses for inspection and testing of structures

1. 17

2. 18

3. 16

4. All of the above

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29. 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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30. What is the minimum grade of concrete to be used in PCC for structures along the sea coast as per IS 456?

1. M30

2. M15

3. M20

4. M25

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31. What clause number from IS456 makes us understand the need for compaction, finishing and curing?

1. 8.2.5

2. 8.2.6

3. 8.2.7

4. 8.2.8

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32. What is the cluase that talks on the Durabilty of Concrete in IS 456?

1. 6

2. 7

3. 8

4. 9

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33. What is the clause that shows the factors that influences the shrinkage of concrete in IS456?

1. 6.2.2

2. 6.2.3

3. 6.2.4

4. 6.2.5

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34. What clause explains the modules of Elasticity in IS456?

1. 6.2.1

2. 6.2.2

3. 6.2.3.1

4. 6.2.4

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35. What is the size of the aggregate mostly used for concreting?

1. 25 mm

2. 15 mm

3. 40 mm

4. 20 mm

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36. 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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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 maximum ratio of span to depth of a cantilever slab is

1. 8

2. 10

3. 12

4. 16

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39. 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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40. A column is regarded as long column if the ratio of its effective length and lateral dimension, exceeds

1. 10

2. 12

3. 20

4. 25

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41. The diameter of transverse reinforcement of columns should be equal to one-fourth of the diameter of the main steel bars, but not less than

1. 4 mm

2. 5 mm

3. 6 mm

4. 7 mm

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42. An R.C.C column is treated as short column if its slenderness ratio is less than

1. 30

2. 35

3. 40

4. 50

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43. 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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44. 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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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. Maximum distance between expansion joints in structures as per IS:456-1978 is?

1. 20 m

2. 30 m

3. 45 m

4. 60 m

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47. 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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48. Which of the following statements is incorrect?

1. Minimum cross sectional area of longitudinal reinforcement in a column is 0.8%.

2. Spacing of longitudinal bars measured along the periphery of column should not exceed 300 mm.

3. Reinforcing bars in a column should not be less than 12mm in diameter.

4. The number of longitudinal bars provided in a circuler column should not be less than four.

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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, the fiexural strength of concrete is?

1. Directly proportional to compressive strength

2. Inversely proportional to compressive strength

3. Directly proportional to squre root of compressive strength

4. Inversely proportional to squre root of compressive strength

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