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

1. 39.3

2. 39.4

3. 39.5

4. 39.6

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6. In Which Clause of IS 456 is it expalined how do we design slab spacing in two directions

1. 36.1.2

2. 37.1.2

3. 38.1.2

4. 39.1.2

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7. In Which Clause of IS 456 is it expalined what is redistribution of moments in continues beams and frames

1. 35.1.1

2. 37.1.1

3. 39.1.1

4. 41.1.1

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8. In Which Clause of IS 456 is it expalined what is limit state of claps and limit state of serviceability

1. 35.2

2. 36.2

3. 37.2

4. 38.2

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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 are the min requirements for reinforcement of shear walls

1. 31.5

2. 31.7

3. 32.3

4. 32.5

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11. 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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12. In Which Clause of IS 456 is it expalined what are the method of analyses and design of flat slab

1. 30.4 & 30.5

2. 31.4 & 31.5

3. 32.4 & 32.5

4. 33.4 & 33.5

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13. 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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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 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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16. 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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17. 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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18. 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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19. Which clause of IS 456 do we reffer to understand the min area of tension reinforcment in beam

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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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 clauses from IS 456 do we use to define the slenderness limits for columns for restrained and unrestrained?

1. 25.3.1

2. 25.3.2

3. Both a and b

4. None of the above

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22. In IS 456 in which Figure can we see the slab loads gets distributed on to beams?

1. Fig 7

2. Fig 24.5

3. Both a and b

4. None of the above

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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 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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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. 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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28. 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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29. 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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30. 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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31. 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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32. What should be the curing period to achieve 50% strength?

1. 7 days

2. 28 days

3. 18 days

4. 12 days

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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 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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36. 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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37. What is the approximate value of total srinkage strain in IS 456?

1. 0.3

2. 0.03

3. 0.003

4. 0.0003

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38. 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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39. 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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40. 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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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. 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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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. The assumption in the theory of bending of beam is?

1. Material is homogeneous

2. Material is isotropic

3. Young’s modulus in tension and in compression is same.

4. All the above

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46. 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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47. The ratio of the diameter of reinforcing bars and the slab thickness is?

1. 1/4

2. 1/5

3. 1/6

4. 1/8

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48. For a longitudinal reinforcement bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than?

1. 15 mm

2. 25 mm

3. 30 mm

4. 40 mm

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49. 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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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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