RCC Structures Design

41. As per I.S. 456 - 1978, the pH value of water shall be

  1. Less than 6
  2. Equal to 6
  3. Not less than 6
  4. Equal to 7

Correct answer: (C)
Not less than 6

42. As per IS : 1343, total shrinkage for a pre-tensioned beam, is

  1. 3.0 × 10-2
  2. 3.0 × 10-3
  3. 3.0 × 10-5
  4. 3.5 × 10-5

Correct answer: (D)
3.5 × 10-5

43. As per IS : 456, the reinforcement in a column should not be less than

  1. 0.5% and not more than 5% of cross-sectional area
  2. 0.6% and not more than 6% of cross-sectional area
  3. 0.7% and not more than 7% of cross-sectional area
  4. 0.8% and not more than 8% of cross-sectional area

Correct answer: (D)
0.8% and not more than 8% of cross-sectional area

44. As the percentage of steel increases

  1. Depth of neutral axis decreases
  2. Depth of neutral axis increases
  3. Lever arm increases
  4. Lever arm decreases

Correct answer: (B)
Depth of neutral axis increases

45. Based on punching shear consideration, the overall depth of a combined footing under a column A, is

  1. (Area of the column A × Safe punching stress)/Load on column A
  2. (Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
  3. (Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)
  4. None of these

Correct answer: (B)
(Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)

46. Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than

  1. 42 diameters from the centre of the column
  2. 42 diameters from the inner edge of the column
  3. 42 diameters from the outer edge of the column
  4. 24 diameters from the centre of the column

Correct answer: (C)
42 diameters from the outer edge of the column

47. By over-reinforcing a beam, the moment of resistance can be increased not more than

  1. 10 %
  2. 15 %
  3. 20 %
  4. 25 %

Correct answer: (D)
25 %

48. Cantilever retaining walls can safely be used for a height not more than

  1. 3 m
  2. 4 m
  3. 5 m
  4. 6 m

Correct answer: (D)
6 m

49. Columns may be made of plain concrete if their unsupported lengths do not exceed their least lateral dimension

  1. Two times
  2. Three times
  3. Four times
  4. Five times

Correct answer: (C)
Four times

50. Design of a two way slab simply supported on edges and having no provision to prevent the corners from lifting, is made by

  1. Rankine formula
  2. Marcus formula
  3. Rankine Grashoff formula
  4. Grashoff formula

Correct answer: (C)
Rankine Grashoff formula

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