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

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1. As per IS 456 what is the formula to determine the depth of neutral axis for a rectangular section 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 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 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 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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5. 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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6. 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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7. In Which Clause of IS 456 is it expalined what are the assumptions for design using limit state of collapse for compression

1. 37.1

2. 38.1

3. 39.1

4. 40.1

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8. 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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9. 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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10. In Which Clause of IS 456 is it defined characteristic load

1. 36.2

2. 37.2

3. 38.2

4. 39.2

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11. 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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12. 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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13. 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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14. 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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15. In Which Clause of IS 456 is it expalined what is the min thickness of a flat slab

1. 30.2.1

2. 31.2.1

3. 32.2.1

4. 33.2.1

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16. 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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17. 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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18. What is the min longitudinal reinforcment for columns as per 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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19. 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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20. 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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21. 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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22. 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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23. Which clauses from IS 456 do we use to cartail tensial reinforcment in Flexural members

1. 24.2.3.1 to 24.2.3.5

2. 25.2.3.1 to 25.2.3.5

3. 26.2.3.1 to 26.2.3.5

4. 27.2.3.1 to 27.2.3.5

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24. 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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25. 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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26. 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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27. 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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28. 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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29. 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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30. 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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31. 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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32. What is the minimum time of mixing of concrete?

1. 2min

2. 3min

3. 4min

4. 1min

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33. 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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34. 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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35. 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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36. 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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37. 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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38. 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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39. 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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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 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. 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 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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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. IS 2062 gives specifications about?

1. High strength steel

2. High strength concrete

3. Concrete for general purpose

4. Hot rolled medium and high tensile Structural steel

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47. How many clauses are there in IS-456 (2000)?

1. 43

2. 41

3. 62

4. 35

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48. 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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49. 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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50. 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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