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 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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3. 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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4. As per IS 46 how many panel types are there for calculating moment coefficient in design of slabs

1. 7 Types table 26

2. 8 Types table 26

3. 9 Types Table 26

4. 10 Types table 26

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5. 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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6. 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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7. 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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8. 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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9. 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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10. 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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11. 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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12. What is the min longitudinal reinforcment in caes of pedistals in IS 456

1. 0.10% of pedistal CS Area

2. 0.15% of pedistal CS Area

3. 0.20% of pedistal CS Area

4. 0.12% of pedistal CS Area

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13. What is the max spacing of longitudinal bars along the perifery of the column as per IS 456

1. 150 mm

2. 200 mm

3. 250 mm

4. 300 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 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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16. 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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17. From IS 456 which clause do we use to get the unsupported length of a compression member?

1. 23.1.3

2. 24.5.3

3. 25.1.3

4. 26.1.3

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18. 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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19. 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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20. 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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21. 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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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. 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. 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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25. 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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26. 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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27. 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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28. 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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29. What is the aim of design any structural elements?

1. 18.1

2. 18.2

3. 18.3

4. 18.4

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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. Clause for tolerances for placing of reinforcments in IS456?

1. 12.3.1

2. 12.3.2

3. 12.3.3

4. 12.3.4

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33. 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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34. What is the cluase that talks on the Durabilty of Concrete in IS 456?

1. 6

2. 7

3. 8

4. 9

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35. 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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36. 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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37. 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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38. 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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39. 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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40. Accoording to whitney’s theory , ultimate strain of concrete is assumed to be

1. 0.0003

2. 0.001

3. 0.003

4. 0.03

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41. The minimum cover for a column should not be less than

1. 15 mm

2. 25 mm

3. 40 mm

4. 45 mm

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42. How many parts (books) does IS code 875 contain?

1. 5

2. 6

3. 7

4. 8

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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. 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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45. The percentage of reinforcement in slabs, when Mild steel bars are used should not be less than?

1. 0.15

2. 0.12

3. 0.3

4. 1

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46. 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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47. 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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48. According to IS:456-1978, the fiexural strength of concrete is?

1. Directly proportional to compressive strength

2. Inversely proportional to compressive strength

3. Directly proportional to squre root of compressive strength

4. Inversely proportional to squre root of compressive strength

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49. For a reinforced concrete section, the shape of shear stress diagram is?

1. Wholly parabolic

2. Wholly rectanguler

3. Parabolic above neutral axis and rectanguler below neutral axis

4. Rectanguler above neutral axis and parabolic below neutral axis

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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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