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 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 how do we arrive at the shear strength to be carried by stirrups

1. vus = vu-vc

2. vus = uc-vv

3. vus = cu-vv

4. vus – uc-cu

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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 expalined what is characteristic strength of concrete

1. 36.1

2. 36.4

3. 37.1

4. 37.4

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8. 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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9. 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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10. 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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11. 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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12. 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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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. As per IS 456 in which clause it is explained how to provide negative reinforcement in deep beam

1. 29.3.2

2. 29.4.2

3. 29.5.2

4. 29.6.2

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15. 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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16. 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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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. 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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19. Which clause of IS 456 do we reffer to understand the nominal cover to reinforcment

1. 26.4.1

2. 26.4.2.1

3. 26.4.2.2

4. All of the above

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20. From IS 456 which clause do we use to get the unsupported length of a compression member?

1. 23.1.3

2. 24.5.3

3. 25.1.3

4. 26.1.3

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21. 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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22. 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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23. Which clauses from IS 456 do we use to calcualte the effective depth of a beam

1. 20

2. 21

3. 22

4. 23

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24. 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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25. 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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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 live loads consideration on structures?

1. IS875-1

2. IS875-2

3. IS875-3

4. IS875-5

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29. 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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30. 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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31. Clause for stripping time of formworks for various structural elements in IS456?

1. 11.1

2. 11.3.1

3. 11.2.1

4. 11.1.1

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32. What is the minimum time of mixing of concrete?

1. 2min

2. 3min

3. 4min

4. 1min

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33. Which codes do we refer for concrete mixers?

1. IS 1791 and IS 12119

2. IS 1791

3. IS 12119

4. IS456 and IS800

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34. What is the code for mixing of concrete as per IS 456?

1. IS Code 10262

2. IS Code 875-Part5.

3. IS Code 1791

4. IS Code 2062

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35. 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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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 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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38. 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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39. 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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40. Spacing of stirrups in a rectangular beam, is

1. Kept constant thoughout the length

2. Decreased towards the centre of the

3. Increased at the ends

4. Increased at the centre of the beam

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41. The spacing of transverse reinforcement of column is decided by the following consideration

1. The least lateral dimension of the column

2. Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column

3. Forty-eight times the diameter of transvers reinforcement

4. All the above

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42. 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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43. 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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44. How many clauses are there in IS-456 (2000)?

1. 43

2. 41

3. 62

4. 35

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45. 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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46. 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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47. 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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48. Minimum grade of concrete to be used in reinforced concrete as per IS:456-2002 is?

1. M15

2. M20

3. M10

4. M25

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49. For a reinforced concrete section, the shape of shear stress diagram is?

1. Wholly parabolic

2. Wholly rectanguler

3. Parabolic above neutral axis and rectanguler below neutral axis

4. Rectanguler above neutral axis and parabolic below neutral axis

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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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