The minimum number of main steel bars provided in R.C.C.

• rectangular columns is 4

• circular columns is 6

• octagonal columns is 8

• all the above.

An R.C.C. beam not provided with shear reinforcement may develop cracks in its bottom inclined roughly to the horizontal at

• 25°

• 35°

• 45°

• 55°

The maximum ratio of span to depth of a slab simply supported and spanning in one direction, is

• 35

• 25

• 30

• 20

If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is

• Square

• Rectangular

• Trapezoidal

• Triangular

The effective span of a simply supported slab, is

• distance between the centres of the bearings

• clear distance between the inner faces of the walls plus twice the thickness of the wall

• clear span plus effective depth of the slab

• none of these.

Pick up the correct statement from the following:

• Lateral reinforcement in R.C.C. columns is provided to prevent the longitudinal reinforcement from buckling

• Lateral reinforcement prevents the shearing of concrete on diagonal plane

• Lateral reinforcement stops breaking away of concrete cover, due to buckling

• All the above

For initial estimate for a beam design, the width is assumed

• 1/15th of span

• 1/20th of span

• 1/25th of span

• 1/30th of span

Design of R.C.C. simply supported beams carrying U.D.L. is based on the resultant B.M. at

• supports

• mid span

• every section

• quarter span.

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

• 10%

• 15%

• 20%

• 25%

Distribution of shear intensity over a rectangular section of a beam, follows :

• a circular curve

• a straight line

• a parabolic curve

• an elliptical curve