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 in which annexure is it expalined what is one way slab

1. Annexure d – 1.10

2. Annexure d – 1.11

3. Annexure d – 1.12

4. Annexure d – 1.13

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3. As per IS 456 what are the max bending moments in slabs in x and y directions

1. Annexure a – 1.1

2. Annexure b – 1.1

3. Annexure c – 1.1

4. Annexure d – 1.1

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4. In Which Clause of IS 456 is it expalined what is limit state of claps and limit state of serviceability

1. 35.2

2. 36.2

3. 37.2

4. 38.2

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5. 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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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 are the min requirements for reinforcement of shear walls

1. 31.5

2. 31.7

3. 32.3

4. 32.5

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8. In Which Clause of IS 456 is it expalined what is the max effective height to thickness ratio in rcc walls

1. 32.2.3

2. 32.2.4

3. 32.2.5

4. 32.2.6

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9. As per IS 456 in which clause it is explained what is a flat slab

1. 30.1

2. 31.1

3. 32.1

4. 33.1

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10. As per IS 456 in which clause it is explained how to provide negative reinforcement in deep beam

1. 29.3.2

2. 29.4.2

3. 29.5.2

4. 29.6.2

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11. What is the min dia of laterail ties in columns in IS 456

1. 26.5.3.3.C1

2. 26.5.3.3.C2

3. 26.5.3.3.C3

4. 26.5.3.3.C4

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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 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 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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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 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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17. 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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18. 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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19. 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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20. 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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21. 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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22. 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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23. Which clause do we reffer while Calcualting the span to effective depth ratios of slabs spanning in two directions, which span should be used as per IS 456?

1. 20.1 Note 1

2. 22.1 Note 1

3. 24.1 Note 1

4. 26.1 Note 1

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24. 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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25. Which clause from IS 456 is the arrangement of the live load is discussed?

1. 22.4.1.A

2. 23.4.1.A

3. 24.4.1.A

4. 25.4.1.A

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26. 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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27. 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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28. In which clause “Design Load” is defined in IS456

1. 19.7

2. 19.8

3. 19.9

4. 19.1

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29. 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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30. 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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31. What is the minimum time of mixing of concrete?

1. 2min

2. 3min

3. 4min

4. 1min

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32. 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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33. What is the table concerned to water cement ratios for different grades of concrete with 20mm aggregate?

1. Table 4

2. Table 5

3. Table 6

4. Table 7

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34. 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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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 is the relation between tensile strength and compressive strength of concrete in IS 456

1. Tensile Strength Fcr = 0.75 SQRT FCK

2. Tensile Strength Fcr = 0.77 SQRT FCK

3. Tensile Strength Fcr = 0.9 SQRT FCK

4. Tensile Strength Fcr = 0.7 SQRT FCK

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37. 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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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. 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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40. The maximum ratio of span to depth of a cantilever slab is

1. 8

2. 10

3. 12

4. 16

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41. 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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42. 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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43. 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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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. 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. 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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47. 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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48. 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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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. 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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