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

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1. As per IS 456 in Annexure it is explained how to obtain compressive reinforcement in doubly reinforced beam

1. Annexure 1

2. Annexure 1.1

3. Annexure 1.2

4. Annexure 1.3

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2. 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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3. In Which Clause of IS 456 is it expalined what is enhanced shear strength of sections closed to supports

1. 40.2

2. 40.4

3. 40.5

4. 40.7

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4. In Which Clause of IS 456 is it expalined what is equation for design of short column in compression with biaxial bending

1. 39.5

2. 39.6

3. 40.5

4. 40.6

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5. 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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6. In Which Clause of IS 456 is it expalined what is the permissible bearing stress we concede while design of footings

1. 0.45 fck 32.4 clause

2. 0.45 fck 33.4 clause

3. 0.45 fck 34.4 clause

4. 0.45 fck 35.4 clause

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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 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 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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10. 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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11. As per IS 456 in which clause it is explained what is column strip and flat slab

1. 32.1.1

2. 29.1.1

3. 30.1.1

4. 31.1.1

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12. 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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13. 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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14. 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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15. 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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16. 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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17. 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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18. 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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19. In IS 456 which clause do we use to understand what is a short column and long column?

1. 24.1.2

2. 25.1.2

3. 26.1.2

4. 27.1.2

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20. Which clause do we use to understand the slenderness limits for beams to ensure lateral stability?

1. 22.3

2. 23.3

3. 24.3

4. 25.3

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21. 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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22. 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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23. 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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24. 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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25. 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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26. 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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27. 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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28. 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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29. What is the minimum grade of concrete to be used in RCC for structures along the sea cost as per IS 456

1. M20

2. M25

3. M30

4. M35

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30. What clause number from IS456 makes us understand the need for compaction, finishing and curing?

1. 8.2.5

2. 8.2.6

3. 8.2.7

4. 8.2.8

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31. For aggregate other than 20 mm , what is the table we have to refer in IS456 code to obtain water cement ratios?

1. Table 5

2. Table 6

3. Table 7

4. Table 8

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32. 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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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 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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35. 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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36. 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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37. The diameter of longitudinal bars of a column should never be less than..

1. 6 mm

2. 8 mm

3. 10 mm

4. 12 mm

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38. The diameter of main bars in R.C.C. columns, shall not be less than

1. 6 mm

2. 8 mm

3. 10 mm

4. 12 mm

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39. A column is regarded as long column if the ratio of its effective length and lateral dimension, exceeds

1. 10

2. 12

3. 20

4. 25

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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. 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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42. 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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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. 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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45. IS 1893-2002 gives details on?

1. Seismic strengthning

2. Retaining walls

3. Wind load design

4. Criteria for Earthquake Resistant Design of Structures

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46. 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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47. 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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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. 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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50. 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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