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 in Annexure it is explained when do we provide compression reinforcement in beam

1. when mu exceeds mu limiting annexure d – 1.2

2. when mu exceeds mu limiting annexure e – 1.2

3. when mu exceeds mu limiting annexure f – 1.2

4. when mu exceeds mu limiting annexure g – 1.2

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3. 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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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 how do we take care of negative moments at a discontinues edge of a slab panel

1. Annexure d – 1.6

2. Annexure d – 1.7

3. Annexure d – 1.8

4. Annexure d – 1.9

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6. 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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7. 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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8. 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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9. 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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10. 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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11. 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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12. 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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13. 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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14. 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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15. In Which Clause of IS 456 is it expalined what is characteristic strength of concrete

1. 36.1

2. 36.4

3. 37.1

4. 37.4

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16. In Which Clause of IS 456 is it expalined what is the min reinforcement and spacing for design of footing

1. 34.5.1

2. 34.5.3

3. 35.5.1

4. 35.5.3

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17. 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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18. 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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19. 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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20. 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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21. 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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22. 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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23. 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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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. 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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26. 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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27. In which clause the effective span of a cantiliver beam or slab is discussed in IS456?

1. 22.2.A

2. 22.2.B

3. 22.2.C

4. 22.2.D

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28. 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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29. Fire resistance of concrete elements depends upon?

1. Type of Aggredate used

2. Member Size

3. Cover to Reinforcement

4. All the three

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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. 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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32. 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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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 is the table in IS 456 concerned to usage of Grades of concrete for plain and reinforced Concrete?

1. Table 5 (IS 456)

2. Table 2 (IS 456)

3. Table 4 (IS 456)

4. Table 1 (IS 456)

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35. What should be the PH value of water used for mixing concrete as per IS 456?

1. Should not be less than 6

2. Should not be less than 4

3. Should not be less than 3.5

4. Should not be more than 7

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36. 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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37. How many Annexures and sections are there in IS 456?

1. A to C

2. A to H

3. A to G

4. Only A

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38. 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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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. 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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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 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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43. Which IS code gives details regarding acid-resistant bricks?

1. IS 4832

2. IS 4860

3. IS 5766

4. IS 5318

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

1. 43

2. 41

3. 62

4. 35

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46. 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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47. Minimum pitch of transverse reinforcement in a column is?

1. The least lateral dimension of the member

2. Sixteen times the smallest diameter of longitudinal reinforcement bar to be tied

3. Forty-eight times the diameter of transeverse reinforcement

4. Least of the above three values

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48. 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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49. 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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50. Minimum grade of concrete to be used in reinforced concrete as per IS:456-2002 is?

1. M15

2. M20

3. M10

4. M25

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