Concrete Technology and Design

11. According to I.S. : 456, the number of grades of concrete mixes, is

  1. 3
  2. 4
  3. 5
  4. 7

Correct answer: (D)
7

12. According to IS : 382-1963, a good aggregate should be

  1. Chemically inert
  2. Sufficiently strong
  3. Hard and durable
  4. All the above

Correct answer: (D)
All the above

13. According to IS: 4561978, 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

Correct answer: (A)
Less than 12

14. According to IS: 4561978, the column 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

Correct answer: (C)
3 times the least lateral dimension

15. According to IS: 4561978, the flexural strength of concrete is

  1. Directly proportional to compressive strength
  2. Inversely proportional to compressive strength
  3. Directly proportional to square root of compressive strength
  4. Inversely proportional to square root of compressive strength

Correct answer: (C)
Directly proportional to square root of compressive strength

16. According to IS: 4561978, the maximum reinforcement in a column is

  1. 2%
  2. 4%
  3. 6%
  4. 8%

Correct answer: (C)
6%

17. According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is

  1. 0.43 d
  2. 0.55 d
  3. 0.68 d
  4. 0.85 d

Correct answer: (A)
0.43 d

18. According to the recommendations of IS : 456-1978, the expansion joints

  1. Are provided where plane changes abruptly
  2. Are provided to ensure minimum resistance
  3. Do not carry reinforcement across them
  4. All the above

Correct answer: (D)
All the above

19. According to Water-Cement Ratio Law, the strength of workable plastic concrete

  1. Depends upon the amount of water used in the mix
  2. Does not depend upon the quality of cement mixed with aggregates
  3. Does not depend upon the quantity of cement mixed with aggregates
  4. All the above

Correct answer: (D)
All the above

20. According to Whitney's theory, depth of stress block for a balanced section of a concrete beam is limited to

  1. 0.43 d
  2. 0.537 d
  3. 0.68 d
  4. 0.85 d
    Where d is effective depth of beam

Correct answer: (B)
0.537 d

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