An R.C.C. lintel is spanning an opening of 2 m span in a brick wall. The height of the roof is 2.9 m above the floor level and that of the opening is 2.1 m above the floor level. The lintel is to be designed for self weight plus

A. A circular curve B. A straight line C. A parabolic curve D. An elliptical curve

A. Equal or less than 5 kg/cm², no shear reinforcement is provided B. Greater than 4 kg/cm², but less than 20 kg/cm², shear reinforcement is provided C. Greater than 20 kg/cm², the size of the section is changed D. All the above

A. Low strength concrete only B. High strength concrete only C. Low strength concrete but high tensile steel D. High strength concrete and high tensile steel

A. $${\frac{1}{4}^{{\text{th}}}}$$ of the span B. $${\frac{1}{5}^{{\text{th}}}}$$ of the span C. $${\frac{1}{6}^{{\text{th}}}}$$ of the span D. $${\frac{1}{7}^{{\text{th}}}}$$ of the span