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

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1. 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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2. 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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3. 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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4. 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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5. 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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6. 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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7. 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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8. 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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9. 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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10. 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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11. 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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12. 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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13. What is the max longitudinal reinforcment for columns in IS 456

1. 26.5.3.1

2. 26.5.3.2

3. 26.5.3.3

4. 26.5.3.4

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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 of IS 456 do we use to understand the min shear reinforcment in beam

1. 26.5.1.6

2. 27.5.1.6

3. 28.5.1.6

4. 29.5.1.6

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16. 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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17. 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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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. What are the limiting values of the span/depth ratio to be satisfied for horizontal deflection of beam/slab for spans over 10m, as per IS 456 which clause do we use?

1. 23.2.1.B

2. 24.2.1.B

3. 25.2.1.B

4. 26.2.1.B

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21. 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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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. 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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24. 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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25. What is the code concerned to dead loads consideration on structures?

1. IS875-1

2. IS875-2

3. IS875-3

4. IS875-5

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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. 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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28. 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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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 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 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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32. 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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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 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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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 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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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. 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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39. 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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40. 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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41. 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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42. 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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43. Which is the most basic IS code for a Civil engineering designs?

1. IS 567

2. IS 456

3. IS 455

4. IS 383

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44. The slab is designed as one way if the ratio of long span to short span is?

1. less than 1

2. Between 1 and 1.5

3. Between 1 and 2

4. Greater than 2

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45. 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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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. 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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48. According to IS:456-1978, the cblumn or the strut is the member whose effective length is greater than?

1. The least lateral dimension

2. 2 times the least lateral dimension

3. 3 times the least lateral dimension

4. 4 times the least lateral dimension

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49. 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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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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