41. If $${{l_1}}$$ and $${{l_2}}$$ are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w1 and w2 acting on strips parallel to $${{l_2}}$$ and $${{l_1}}$$ is
42. The minimum thickness of a flat slab is taken
43. Columns may be made of plain concrete if their unsupported lengths do not exceed their least lateral dimension
44. The number of treads in a flight is equal to
45. An R.C.C. column of 30 cm diameter is reinforced with 6 bars 12 mm φ placed symmetrically along the circumference. If it carries a load of 40,000 kg axially, the stress is
46. If d and n are the effective depth and depth of the neutral axis respectively of a singly reinforced beam, the lever arm of the beam, is
47. The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is
48. In a singly reinforced beam, the effective depth is measured from its compression edge to
49. The steel generally used in R.C.C. work, is
50. The advantage of reinforced concrete, is due to
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