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 calculate spacing of shear reinforcement for vertical stirrups

1. 40.2

2. 40.4

3. 40.6

4. 40.8

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4. 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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5. 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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6. 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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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 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 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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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 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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13. 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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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. 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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16. 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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17. 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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18. 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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19. 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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20. 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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21. 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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22. 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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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. 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 (Figure number) the minimum dimensions of RCC members are discussed in IS456?

1. Fig 1

2. Fig 2

3. Fig 3

4. Fig 4

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27. Clause for tolerances for placing of reinforcments in IS456?

1. 12.3.1

2. 12.3.2

3. 12.3.3

4. 12.3.4

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28. 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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29. 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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30. 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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31. 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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32. 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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33. 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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34. 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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35. 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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36. Which type of water is to be used for mixing concrete as per IS 456?

1. Bore water

2. Sea Water

3. Potable Water

4. Clean Mineral water

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37. 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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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 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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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. 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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43. 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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44. Maximum percentage reinforcement in case of slabs is limited to

1. 2

2. 4

3. 6

4. 8

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45. The diameter of ties in column should be

1. More than or equal to one fourth of diameter of main bar

2. More than or equal to 5mm

3. More than 5 mm but less than one-fourth of diameter of main bar

4. More than one-fourth of diameter of main bar and not less than 5 mm

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46. 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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47. Critical section for punching shear in case of flat slabs is at a distance of?

1. Effective depth for slab from periphery of column/drop panel

2. d/2 from periphery of column/capital/drop panel

3. At the drop panel of slab

4. At the periphery of column

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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. 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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