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

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1. As per IS 456 what are the formulas for calculating moment of resistance of rectangular sections without compression reinforcement

1. Annexure g – 1.1 a

2. Annexure g – 1.1 b

3. Annexure g – 1.1 c

4. Annexure g – 1.1 b & c

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2. AS per IS 456 when is it not required to provide torsion reinforcement in slab

1. Annexure d – 1.9

2. Annexure d – 1.10

3. Annexure d – 1.11

4. Annexure d – 1.12

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3. 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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4. 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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5. 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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6. 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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7. In Which Clause of IS 456 is it expalined what is difference between drop and column head in flat slab

1. 30.2.2 & 3

2. 30.3.2 & 3

3. 31.2.2 & 3

4. 31.3.2 & 3

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8. In Which Clause of IS 456 is it expalined what is middle strip in flat slab

1. 30.1.1

2. 31.1.1

3. 32.1.1

4. 33.1.1

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9. As per IS 456 in which clause the length of the structure beyond which we provide expansion joint is explained

1. 25.2

2. 26.2

3. 27.2

4. 28.2

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10. 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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11. 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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12. What is the code for detailing earthquake resitant construction

1. IS 13902

2. IS 19302

3. IS 13920

4. IS 19320

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13. Which clauses from IS 456 do we use to understand the min excentricity for design of columns

1. 22.4

2. 23.4

3. 24.4

4. 25.4

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14. 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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15. 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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16. 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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17. Which clauses from IS 456 do we use to understand the redistribution of moments

1. 22.7

2. 37.1.1

3. Both a and b

4. None of these

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18. In which clause the effective span of a cantiliver 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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19. 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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20. 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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21. Fire resistance of concrete elements depends upon?

1. Type of Aggredate used

2. Member Size

3. Cover to Reinforcement

4. All the three

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22. 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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23. What is the method of design usally adopted in design of structural elements

1. 18.1.1 & 18.1.2

2. 18.2.1 & 18.2.2

3. 18.3.1 & 18.3.2

4. 18.4.1 & 18.4.2

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24. 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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25. 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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26. 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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27. 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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28. 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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29. 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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30. 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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31. What is the formula for modules fo elasticity of concrete as per IS456?

1. E = 4500 SQRT FCK

2. E = 5000 SQRT FCK

3. E = 5500 SQRT FCK

4. E = 4000 SQRT FCK

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32. 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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33. What does M and 20 Stands for M20 Grade in IS 456

1. M is Material design and 20mm is the size of course aggregate.

2. M is Metal design and 20mm is the size of course aggregate.

3. M is Mix design and 20 is compressive strength of concrete of 15cm cube tested after 28 days of curing, below which 5% of the test results fail.

4. M is Material design and 20 is cube strength of 28cm size.

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34. 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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35. Clause for using grade of concrete lesser than what is mentioned in Tabe-5 IS-456?

1. Yes – 6.1.1

2. Yes – 6.1.2

3. Yes – 6.1.3

4. Yes – 6.1.4

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36. 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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37. 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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38. 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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39. If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is

1. 10 mm

2. 12 mm

3. 14 mm

4. 16 mm

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40. 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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41. 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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42. 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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43. 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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44. 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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45. The minimum diameter for longitudinal bars in a column is

1. 6 mm

2. 8 mm

3. 12 mm

4. 16 mm

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46. 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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47. Which IS code gives details regarding acid-resistant bricks?

1. IS 4832

2. IS 4860

3. IS 5766

4. IS 5318

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48. 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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49. 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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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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