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

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1. As per IS 456 in which annexure is it expalined what is one way slab

1. Annexure d – 1.10

2. Annexure d – 1.11

3. Annexure d – 1.12

4. Annexure d – 1.13

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2. 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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3. In Which Clause of IS 456 is it expalined how do we provide shear reinforcement if tow-v exceeds tow-c

1. 38.4

2. 40.4

3. 42.4

4. 44.2

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4. 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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5. In Which Clause of IS 456 is it expalined what are the additional moments to be calculated inn case of slender compression members

1. 39.1

2. 39.3

3. 39.5

4. 39.7

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6. 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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7. 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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8. 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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9. In Which Clause of IS 456 is it expalined what is the max effective height to thickness ratio in rcc walls

1. 32.2.3

2. 32.2.4

3. 32.2.5

4. 32.2.6

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10. In Which Clause of IS 456 is it expalined what is the min thickness of rcc wall

1. 31.1

2. 32.1

3. 33.1

4. 34.1

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11. 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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12. In Which Clause of IS 456 is it expalined what is the critical section for shear in flat slabs

1. 30.4

2. 30.6

3. 31.4

4. 31.6

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13. As per IS 456 in which clause it is explained what is a flat slab

1. 30.1

2. 31.1

3. 32.1

4. 33.1

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14. What is the min dia of laterail 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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15. Which clause of IS 456 is usded to understand side face reinforcment in beam

1. 26.4.1.3

2. 26.5.1.3

3. 26.4.2.3

4. 26.5.1.4

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16. As per IS 456 Which Clause do we use to find the max area of tension reinforcemnt in beams

1. 26.5.1.1.A

2. 26.5.1.1.B

3. 26.5.1.1.C

4. Both a and c

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17. 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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18. Which clauses from IS 456 do we use to cartail tensial reinforcment in Flexural members

1. 24.2.3.1 to 24.2.3.5

2. 25.2.3.1 to 25.2.3.5

3. 26.2.3.1 to 26.2.3.5

4. 27.2.3.1 to 27.2.3.5

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19. As per IS 456 What is the effective length of compression members?

1. Annexure B Table 28

2. Annexure C TABLE 28

3. Annexure D Table 28

4. Annexure E TABLE 28

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20. 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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21. What is the Span/overall depth ratios for slabs of slabs upto 3.5m for Mild steel and HYSD steel in IS 456?

1. 20.3 Note 2

2. 22.5 Note 2

3. 24.1 Note 2

4. 26.2 Note 2

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22. Which clause do we reffer while Calcualting the span to effective depth ratios of slabs spanning in two directions, which span should be used as per IS 456?

1. 20.1 Note 1

2. 22.1 Note 1

3. 24.1 Note 1

4. 26.1 Note 1

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23. 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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24. For monolithic construction, where shall be the moments computed for the design of the members?

1. Face of the supports

2. Centre of the supports

3. 25cm from face of supports

4. 50cm from face of supports

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

1. 22.1.A

2. 22.2.A

3. 22.3.A

4. 22.4.A

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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 clause that discussed on the loads to be considered while designing structures?

1. 19.1

2. 19.2

3. 19.3

4. 19

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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. What is the minimum time of mixing of concrete?

1. 2min

2. 3min

3. 4min

4. 1min

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32. The 6 factors that influences the Durability of concrete are mentioned in which clause of IS 456?

1. 8.1.1

2. 8.2.1

3. 8.3.1

4. 8.4.1

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33. 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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34. What are the values of Creep Coefficient as per IS 456?

1. 7 Day – 2.2

2. 28 Days – 1.6

3. One Year – 1.1

4. All of them

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35. 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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36. What is the table that specifies the possible grades of concrete as per IS 456?

1. Table 1

2. Table 2

3. Table 3

4. Table 4

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37. 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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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. 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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40. 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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41. 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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42. P = Pi*2 E I /L*2 is the buclking load for column with..!

1. Both the ends are fixed

2. Both the ends are hinged

3. One end is fixed and other end is free

4. One end is fixed and other end is hinged

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

1. 5

2. 6

3. 7

4. 8

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44. 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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45. The percentage of reinforcement in slabs, when Mild steel bars are used should not be less than?

1. 0.15

2. 0.12

3. 0.3

4. 1

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46. 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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47. According to IS:456-1978, the maximum percentage of reinforcement in a column is?

1. 2

2. 4

3. 6

4. 8

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48. 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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49. Maximum quantity of water needed per 50kg of cement for M15 grade of concrete (PCC) as per Table-5 of IS-456 is?

1. 28 liters

2. 30 liters

3. 32 liters

4. 34 liters

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50. The factor of safety in design for?

1. Steel and concrete are same

2. Steel is lower than that for concrete

3. Steel is higher than that for concrete

4. None of the above

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