## 61. If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:

## 62. The percentage of minimum reinforcement of the gross sectional area in slabs, is

## 63. If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width

## 64. If ‘W’ is the uniformly distributed load on a circular slab of radius ‘R’ fixed at its ends, the maximum positive radial moment at its centre, is

## 65. The stem of a cantilever retaining wall which retains earth level with top is 6 m. If the angle of repose and weight of the soil per cubic metre are 30° and 2000 kg respectively, the effective width of the stem at the bottom, is

## 66. The floor slab of a building is supported on reinforced cement floor beams. The ratio of the end and intermediate spans is kept

## 67. An R.C.C. column is treated as short column if its slenderness ratio is less than

## 68. A ribbed slab is provided for

## 69. The thickness of the topping of a ribbed slab, varies between

## 70. The diameter of transverse reinforcement of columns should be equal to one-fourth of the diameter of the main steel rods but not less than

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